TSB Thread

Discussion in 'Maintenance' started by Cleanoh4, Sep 3, 2013.

  1. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    This was brought up in another thread, so I thought I'd take the initiative and start it. Post up common TSB's and maybe it will become a one stop resource for common issues. Use complete TSB's only.

    I'll start with a few:

    G80 and Additive

    LOCKING DIFFERENTIAL LUBRICANT (SERVICE INFORMATION) #91-4-109
    SUBJECT: LOCKING DIFFERENTIAL (G80) LUBRICANT - (SERVICE INFORMATION)
    VEHICLES AFFECTED: ALL LIGHT TRUCKS EQUIPPED WITH G80 REAR AXLE ALL YEARS
    Some light duty trucks equipped with locking rear axles (G80) may exhibit rear axle chatter, especially when turning a corner from a stop.
    This condition of alternate engagement and disengagement of clutches in differential assembly is usually caused by contaminated axle lubricant.
    To correct this condition, drain and refill the rear axle with SAE 80W-90 GL5 (P/N 10950849).

    The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life.

    VEHICLES/COMPONENTS INVOLVED: ------------------------- ---- Some light duty trucks equipped with locking rear axles, RPO G80.
    SERVICE PARTS INFORMATION:
    Part Number Description ----------- ------------------ 10950849 Lubricant, Rear Axle (1 litre)
    Parts are currently available through CANSPO.
    WARRANTY INFORMATION:
    As specified in Light Duty Truck Maintenance Schedules, locking rear axle fluid drain and refill is required owner maintenance at the first engine oil change. Failure to drain and refill the rear axle as specified may contribute to a later axle chatter condition. Refer to the appropriate Light Duty Truck Maintenance Schedule or service manual, section OB, for further details on change intervals.
    General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
    © Copyright General Motors Corporation. All Rights Reserved.
     
  2. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    Body Mount Insulator
    #06-08-61-003D: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator) - (Sep 10, 2008)
    Subject: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator)

    Models: 2004-2008 Cadillac Escalade, Escalade ESV, Escalade EXT
    2004-2008 Chevrolet Avalanche, Suburban, Tahoe
    2004-2008 Chevrolet Silverado (Classic), Silverado
    2004-2008 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
    2004-2008 GMC Sierra (Classic), Sierra Denali (Classic), Sierra, Sierra Denali



    This bulletin is being revised to update the model years and include diagnosis information. Warranty information has also been updated. Please discard Corporate Bulletin Number 06-08-61-003C (Section 08 - Body and Accessories).

    Condition

    Some customers may comment on a pop or clunk type noise while turning or driving on uneven road surfaces. This noise can be heard and/or felt at either the driver's or front passenger floor pan area.

    Cause

    Under certain conditions, normal movement between the frame and the #1, #2 or #3 body mounts may cause this noise to occur.
    Diagnosis

    1. If the vehicle is equipped with aftermarket (non-GM Accessory) running boards or the running board is mounted using the body mount bolt, remove the running boards prior to test driving the vehicle. This will eliminate the running boards as the possible cause of the noise.
    2. Install the J-39570 Chassis Ears to the frame rail at or near the body mounts.
    3. Test drive the vehicle to identify which mount is suspect.

    Correction

    Install an insulator at the suspect mount(s). The insulator should be installed between the upper portion of the body mount and the frame bracket. The #1 mount is the mount located just under the A-pillar. The #2 mount is the mount located just under the B-pillar. The #3 mount is the mount located just under the C-pillar. Use the procedure listed below.

    INSULATOR PART NUMBER 15899719

    1. Raise the vehicle on the hoist. It is recommended to use a four-post lift or strap the vehicle frame to the hoist arms.
    2. For the left side mounts only, remove the intermediate park brake cable. Perform the following steps:
    2.1. Remove the nut from the park brake equalizer.
    2.2. Remove the intermediate cable from the equalizer.
    2.3. Depress the retaining tabs that secure the park brake cable to the frame.
    2.4. Pull slightly on the cable from the mounting area in order to provide slack for body movement without binding the cable.
    3. Remove all of the body mount bolts on the side being repaired.
    4. Properly support the body at the body mount area.
    Caution: When you remove the body mount, do NOT separate the frame from the body more than is necessary. Possible personal injury and damage to multiple parts may result.
    5. Lower the chassis accordingly in order to remove the upper portion of the body mount.
    6. Install the new insulator to the bottom of the top portion of the body mount. The picture shows the insulator (1) location after the body mount is reassembled.
    7. Install the body mount to the frame bracket.
    8. Perform the following procedure before installing the bolts.
    8.1. Clean the bolt threads of all the original thread locking compound.
    8.2. Clean the threads of the bolt with denatured alcohol or equivalent and allow to dry.
    8.3. Apply Threadlocker, GM P/N 89021297 (In Canada, use P/N 10953488).
    9. Install the body mount bolts.

    Tighten
    For 2003, 2004 and 2005 model year, tighten the bolts to 85 N·m (63 lb ft).

    Tighten
    For 2006-2008 model year, tighten the bolts to 100 N·m (74 lb ft).
    10. Reinstall the intermediate park brake cable (left side only).
     
  3. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    ABS Low Speed Activation

    Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)


    Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)
    2002-2004 Cadillac Escalade, Escalade EXT

    2003-2004 Cadillac Escalade ESV

    1999-2004 Chevrolet Silverado

    2001-2004 Chevrolet Suburban, Tahoe

    2002-2004 Chevrolet Avalanche

    2003-2004 Chevrolet Express

    1999-2004 GMC Sierra

    2001-2004 GMC Yukon, Yukon XL

    2003-2004 GMC Savana

    2003-2004 HUMMER H2

    Condition
    Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

    Cause
    The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

    Correction
    Measure AC voltage and clean the wheel speed sensor mounting surfaces.

    Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual (SI Document ID #899664).
    Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
    Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
    Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. Plug the WSS bore in order to prevent debris from falling into the hub during service.
    Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

    Important
    Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.


    Apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344.
    Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
    Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV's.
     
  4. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    Blower Motor Resistor

    10240 - SPECIAL COVERAGE ADJUSTMENT - HEATING, VENTILATION, AND AIR CONDITIONING BLOWER NOT FULLY FUNCTIONAL OR INOPERATIVE
    SERVICE CAMPAIGN BULLETIN
    Reference Number(s): 10240, Date of Issue: May 09, 2011 2003-2006 Chevrolet Avalanche, Suburban Tahoe; 2003-2007 Chevrolet Silverado; 2003-2006 GMC Yukon, Yukon XL; 2003-2007 GMC Sierra; Equipped with Manual HVAC (CJ3) or Heavy Duty Heater (C42) Affected Model(s):
    Related Ref Number(s): 10240
    ARTICLE BEGINNING
    CONDITION
    On some 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; and 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a manual heating, ventilation, and air conditioning (HVAC) system (CJ3) or heavy duty heater (C42), the interface between the electrical terminals of the relay resistor module and the wiring connector that powers the module may be incapable of conducting higher current levels for sustained periods of blower motor operation. In addition, moisture and other contaminants may enter the fresh air intake plenum and contact the internal circuit of the module or corrode the terminals. If any of these were to occur, the relay resistor module or wiring connector could overheat and the HVAC blower may not function on certain blower settings or may be inoperative. This may be accompanied by a burning smell or smoke.
    SPECIAL POLICY COVERAGE ADJUSTMENT
    This special coverage covers the condition described above for a period of 10 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.
    Dealers are to install a new blower motor resistor and resistor module connector. The repairs will be made at no charge to the customer.
    For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May 10, 2011, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to May 10, 2011, must be submitted to the Service Contract provider.
    VEHICLES INVOLVED
    Involved are certain 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; and 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a manual HVAC (CJ3) or heavy duty heater (C42).
    IMPORTANT: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the Applicable Warranties section in the Global Warranty
    Management system.
    PARTS INFORMATION
    Parts required to complete this special coverage are to be obtained from General Motors Customer Care and Aftersales (GMCC & A).
    Parts Information Part Number Description Qty/ Vehicle 15862656 Connector, SW-Pwr St Adjr 1 89019088 Resistor, Blo Mot (A/C & Htr) 1 89019089 Resistor, Blo Mot (Heater Only) 1
    SERVICE PROCEDURE
    NOTE: The resistor module connector and blower motor resistor will need to be replaced if one or more of the symptoms below is present.
     The HVAC blower may not function on certain or all blower speed settings
     A burning plastic smell or smoke may be present in the vehicle
     The HVAC blower may run continually with the ignition in the OFF position

    Determine if one or more of the above symptoms is present. If required, refer to HVAC diagnostic information in SI. Refer to Resistor Module Connector and Blower Motor Resistor Replacement in this bulletin if one or more of the symptoms are present. Other HVAC repairs are NOT covered in this product safety special coverage bulletin.
    Resistor Module Connector and Blower Motor Resistor Replacement
    1.Remove the blower fuses (Htr A/C & HVAC 1 fuses). 2.Lower the close-out panel enough to gain access to the resistor module connector. 3.Disconnect the connector from the resistor module.
    NOTE: Connector replacement is required even if the connector was replaced on a previous service repair.
    4.Remove the tape from the wiring harness to expose the wiring.
    5.Cut the wires back far enough from the connector to eliminate any melted insulation on the wire.
    NOTE: Use the old connector as a map for splicing the wires for the new connector. Be sure to use the correct crimping tool from the terminal repair kit J 38125. Use only Duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection.
    6.Install the new connector. Use the yellow splice sleeves provided with the connector. 7.Install the new blower motor resistor. 8.Reinstall the fuses. Test the blower motor to make sure all speeds are functional. 9.Reinstall the hush panel/close-out panel.
    CUSTOMER REIMBURSEMENT
    Customer requests for reimbursement of previously paid repairs for the condition described in this bulletin are to be submitted to the dealer May 31, 2012, unless otherwise specified by State law. Repairs must have occurred within 10 years of the date the vehicle was originally placed in service, or 150,000 miles (240,000 km), whichever occurs first.
    All reasonable customer paid receipts should be considered for reimbursement. The amount to be reimbursed will be limited to the amount the repair would have cost if completed by an authorized General Motors dealer.
    When a customer requests reimbursement, they must provide the following:
     A completed Customer Reimbursement Request Form. This form is mailed to the customer or can be obtained from the dealer.
     The name and address of the person who paid for the repair.
     VIN, original paid receipt confirming the amount of repair expense(s) that were not reimbursed, a description of the repair, and the person or entity performing the repair.
    FOR US DEALERS:
    If a reimbursement request is denied, dealers MUST provide the customer with an explanation, in writing, as to why the request was denied. GM expects all reimbursement requests to be properly resolved within 30 days of receipt. If the denial was due to missing documents, the customer can resubmit when the missing documents are obtained, as long as it is still within the allowed reimbursement period.
    COURTESY TRANSPORTATION - FOR US
    The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines.
    WARRANTY TRANSACTION INFORMATION
    Submit a transaction using the table below.
    Warranty Transaction Information Labor Code Description Labor Time Net Item T5816 Diagnostic Time Only - No Repair Required (condition other than described in bulletin) 0.1-0.3 N/A T5817 Replace HVAC Module Connector and Resistor 0.6 N/A T5818 Customer Reimbursement Approved 0.2 * T5819 Customer Reimbursement Denied - For US dealers only 0.1 N/A
    * The amount identified in "Net Item" should represent the dollar amount reimbursed to the customer.
    CUSTOMER NOTIFICATION
    General Motors will notify customers of this special coverage on their vehicles (see copy of typical customer letter included with this bulletin - actual divisional letter may vary slightly).
    OWNER LETTER
    Dear General Motors Customer:

    **removed apology section due to posting size limitations-(we love you, we're sorry, we're doing the right thing) you get the drift**

    Customer Notification Division Number Text Telephones (TTY) Chevrolet 1-800-222-1020 1-800-833-2438 GMC 1-800-462-8782 1-888-889-2438 Guam 65-6267-1752 Puerto Rico - English 1-800-496-9992 Puerto Rico - Espanol 1-800-496-9993 Virgin Islands 1-800-496-9994
    We are sorry for any inconvenience you may experience; however we have taken this action in the interest of your continued satisfaction with our products.
    Jim Moloney
    General Director,
    Customer and Relationship Services
    Enclosure
    10240
     
  5. Jared

    Jared Administrator Staff Member

    Messages:
    20,590
    great move, I am going to sticky this!
     
  6. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    Cool, figured it was a good way to contribute.

    I just hope it takes off and becomes what it can be.
     
  7. Tylers88

    Tylers88 3 GM's and a Jeep

    Messages:
    6,581
    Wasn't there a tsb on the early GMT800s for low speed surging, like creeping in a parking lot, because of spark plug gap being set at 0.060" when it should have been 0.040"? I know this is probably corrected on 99% of them already but they do still say 0.060" under the hood IIRC.
     
  8. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    Subject: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel
    Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder and/or
    Install Updated Valve Cover)
    Models: 2007-2011 Cadillac Escalade Models
    2007-2011 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe
    2010-2011 Chevrolet Camaro
    2007-2011 GMC Sierra 1500, Sierra Denali, Yukon Models
    2008-2009 Pontiac G8 GT
    Built Prior to February 1, 2011 (Updated Valve Cover) and October 2010 (AFM Shield)
    Equipped with Any of the Following Engines:
    – Aluminum Block V8 Engine with Active Fuel Management (AFM)
    (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92)
    – Iron Block V8 Engine with Active Fuel Management (AFM) (RPOs LMG, LY5)
    – Hybrid Engine (RPO LFA – Only Applies to Hybrid Models Built July 7, 2009 -
    February 1, 2011 – Prior Builds Not Cast For AFM Valve)
    Attention: This bulletin does not apply to the Buick Rainier, Chevrolet TrailBlazer and GMC Envoy
    equipped with LH6 due to a different design oil pan and AFM pressure relief valve.
    This bulletin is being revised to update the Warranty Information. Please discard Corporate
    Bulletin Number 10-06-01-008F (Section 06 – Engine/Propulsion System).
    Condition
    Some customers may comment about engine oil
    consumption of vehicles with higher mileage
    (approximately 48,000 to 64,000 km (30,000 to
    40,000 mi) and a service engine soon light being on
    and/or rough running engine. Verify that the PCV
    system is functioning properly. If the customer
    understands that some oil consumption is normal and
    still feels the consumption level is excessive, more than
    1 quart per 2000 to 3000 miles of driving, perform the
    service indicated in this bulletin. It is no longer
    necessary to have the customer return multiple times to
    have the usage verified.
    Cause
    This condition may be caused by two conditions. Oil
    pulled through the PCV system or oil spray that is
    discharged from the AFM pressure relief valve within
    the crankcase. Under most driving conditions and drive
    cycles, the discharged oil does not cause a problem.
    Under certain drive cycles (extended high engine
    speed operation), in combination with parts at the high
    end of their tolerance specification, the oil spray
    quantity may be more than usual, resulting in excessive
    deposit formation in the piston ring grooves, causing
    increased oil consumption and cracked or fouled spark
    plugs (#1 and/or #7). Refer to the latest version of
    Corporate Bulletin Number 12-06-01-001.
    Page 2 January, 2013 Bulletin No.: 10-06-01-008G
    Correction
    Aluminum or Cast Iron Block - Oil in Intake
    Manifold - Install Updated Valve Cover on All
    Models Built Prior to February 1, 2011
    Note: If vehicle is built after this breakpoint, it should
    already be equipped with this updated valve cover.
    2740641
    1) Old Design
    2) New Design
    PCV pullover or an overactive lifter can cause oil to be
    pulled through the PCV system even at low vehicle
    mileage. A correctly functioning PCV system will only
    leave a film of oil in the intake manifold. Inspect the
    intake manifold to see if there is any oil puddling in the
    bottom. If there is you will need to replace the left valve
    cover. Two new left rocker arm covers have been
    released for trucks and vans. Technicians should
    replace the left rocker arm cover with GM
    P/N 12570427 for 2007-2008 or GM P/N 12642655 for
    2009-2011. Refer to the Parts Information below for the
    Camaro. This rocker arm cover has a relocated PCV
    drain hole that prevents oil from entering the intake
    manifold. Refer to Valve Rocker Arm Cover
    Replacement - Left Side in SI.
    Note: These rocker covers are for specific years. The
    PCV orifice is different for each. The correct cover must
    be used or an SES light may set.
    Aluminum Block - Oil Getting Past Piston
    Rings - Free Up Piston Rings and Install AFM
    Shield on All Non-Hybrid Models Built Prior to
    October 1, 2010 or all Hybrid Models Built
    July 7, 2009 - October 1, 2010
    Note: If vehicle is built outside of this breakpoint, it
    should already be equipped with this AFM shield
    or the pan does not have an AFM valve (LFA before
    July 7, 2009).
    To correct this condition, install an AFM shield, perform
    the piston cleaning procedure as described in this
    document and install a new oil pan gasket per the
    procedure outlined in this document. Monitor oil
    consumption after this repair to ensure oil consumption
    has improved to acceptable levels.
    If this repair does not correct the condition, it may be
    necessary to replace all of the piston assemblies
    (piston and rings) with new parts. Refer to SI for repair
    procedure.
    Important: It is critical in this cleaning process that the
    engine/fuel injector cleaner remain in the cylinders for a
    minimum of 2.5 hours to fully clean the components.
    The cleaner solution must be removed before a
    maximum of three hours.
    1. Remove the spark plugs and ensure that none of
    the pistons are at top dead center (TDC).
    2. Clean the pistons by putting 118-147 ml (4-5 oz) of
    Upper Engine and Fuel Injector Cleaner, GM
    P/N 88861803 (in Canada, use 88861804), in each
    cylinder. Allow the material to soak for at least
    2.5-3.0 hours, but no more than three hours and
    then remove the cleaner. A suggested method of
    removing the cleaner is cranking the engine over.
    Make sure to unplug the ignition coils and fuel
    injector before cranking the engine over. Also
    make sure that the painted surfaces are covered
    so no damage is done.
    3. Remove the oil pan. Refer to Oil Pan Replacement
    in SI.
    2474205
    Bulletin No.: 10-06-01-008G January, 2013 Page 3
    4. Remove the AFM valve (1).
    2474207
    5. Install the new shield (1), GM P/N 12639759, and
    tighten the AFM valve to the oil pan to 28Y
    (20 lb ft).
    Important: Ensure that the engine cleaner is
    thoroughly removed before reinstalling the spark plugs.
    Failure to do so may result in a hydro-lock condition.
    6. Reinstall the spark plugs. Replace the spark plugs
    if necessary due to full of carbon. Refer to the parts
    catalog.
    7. Reinstall the oil pan. Refer to the Oil Pan
    Installation procedure in SI. Replace the oil pan
    gasket if necessary. Refer to the parts catalog.
    Replace the engine oil.
    8. Re-evaluate the oil consumption. Document on the
    repair order. If the oil consumption is still greater
    than 0.946 L (1 qt) in 3,200 km (2000 mi),
    replacement of the pistons and rings will be
    required.
    Important: Some minor scratches may be noticed on
    the cylinder walls during piston and ring replacement. If
    the scratch cannot be felt when running your finger nail
    over it, the scratch is considered normal wear and the
    block or engine should not be replaced.
    Note: It is not necessary to hone or deglaze the
    cylinder walls. Honing may induce unnecessary
    cylinder wall and / or piston ring damage if it is done
    incorrectly and/or not cleaned thoroughly. Cylinder
    walls should cleaned thoroughly with brake cleaner
    before installation of the new pistons and rings.
    Numerous engines replaced for oil consumption have
    been inspected. The cross hatch has been consistently
    good and is in specification. As a result, is should not
    be necessary to measure the cylinders if they pass the
    visual inspection.
    Note: After the piston/ring replacement it will take
    2000-3000 mi. for the new rings to seat. Adequate
    break time is necessary prior to rechecking the oil
    consumption level.
    Note: Do not overlook the valve seals at higher
    mileage. Look in the head ports for evidence of
    excessive amounts of oil getting past the seals.
    Note: It is recommended to install an AFM shield any
    time that the oil pan is removed for any reason and an
    AFM shield is not found.

    - - - - - - - - - -auto merged double post- - - - - - - - - -

    Cast-Iron Block - Oil Getting Past Piston
    Rings - Free Up Piston Rings on All Models
    Built Prior to October 1, 2010
    1. Remove the spark plugs and ensure that none of
    the pistons are at top dead center (TDC).
    2. Clean the pistons by putting 118-147 ml (4-5 oz) of
    Upper Engine and Fuel Injector Cleaner, GM
    P/N 88861803 (in Canada, use 88861804), in each
    cylinder. Allow the material to soak for at least
    2.5-3.0 hours, but no more than three hours and
    then remove the cleaner. A suggested method of
    removing the cleaner is cranking the engine over.
    Make sure to unplug the ignition coils and fuel
    injector before cranking the engine over. Also
    make sure that the painted surfaces are covered
    so no damage is done.
    Important: Ensure that the engine cleaner is
    thoroughly removed before reinstalling the spark plugs.
    Failure to do so may result in a hydro-lock condition.
    3. Reinstall the spark plugs. Replace the spark plugs
    if necessary due to full of carbon. Refer to the parts
    catalog.
    4. Re-evaluate the oil consumption. Document on the
    repair order. If the oil consumption is still greater
    than 0.946 L (1 qt) in 3,200 km (2000 mi),
    replacement of the pistons and rings will be
    required.
    Note: It is not necessary to install the shield when
    doing the piston cleaning on a cast iron block engine
    since the cast iron block engine uses a different oil
    pump than an aluminum block engine, which results in
    a higher engine speed before the AFM pressure relief
    valve opens (cast iron block engines are less prone to
    the AFM oil spray condition described earlier). If you
    find it necessary to replace the pistons and/or remove
    the oil pan for any other reason, only then should you
    add the shield.

    - - - - - - - - - -auto merged double post- - - - - - - - - -

    Page 4 January, 2013 Bulletin No.: 10-06-01-008G
    2596639
    2596640
    Important: Some minor scratches may be noticed on
    the cylinder walls during piston and ring replacement. If
    the scratch cannot be felt when running your finger nail
    over it, the scratch is considered normal wear and the
    block or engine should not be replaced.

    - - - - - - - - - -auto merged double post- - - - - - - - - -

    cylinder walls. Honing may induce unnecessary
    cylinder wall and / or piston ring damage if it is done
    incorrectly and/or not cleaned thoroughly.
     
  9. Tylers88

    Tylers88 3 GM's and a Jeep

    Messages:
    6,581
    Auto double post crap still sucks
     
  10. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,598
    Cylinder
    walls should cleaned thoroughly with brake cleaner
    before installation of the new pistons and rings.
    Numerous engines replaced for oil consumption have
    been inspected. The cross hatch has been consistently
    good and is in specification. As a result, is should not
    be necessary to measure the cylinders if they pass the
    visual inspection.
    Note: After the piston/ring replacement, it will take
    2000-3000 miles for the new rings to seat. Adequate
    break time is necessary prior to rechecking the oil
    consumption level.
    Note: Do not overlook the valve seals at higher
    mileage. Look in the head ports for evidence of
    excessive amounts of oil getting past the seals.
    Note: It is recommended to install an AFM shield any
    time that the oil pan is removed for any reason and an
    AFM shield is not found.
    Parts Information
    Part Number Description Qty
    12639759 DEFLECTOR-OIL PRESS RLF
    VLV (quantity of 3 per order) 1
    88861803 (in
    Canada, use
    88861804)
    CLEANER, F/INJR 16 OZ LIQUID
    POUR (Upper Engine and Fuel
    Injector Cleaner)
    3
    12612350 GASKET, OIL PAN 1
    12642655 COVER ASM-VLV RKR ARM
    (2009-2011 Truck Models Only) 1
    12570427 COVER ASM-VLV RKR ARM
    (2007-2008 Truck Model Only) 1
    12642655 COVER ASM-VLV RKR ARM
    (2010-2011 Camaro) 1
    12570427
    COVER ASM-VLV RKR ARM
    (2008–2009 G8 WITHOUT
    RPO BSI Only)
    1
    12642655 COVER ASM-VLV RKR ARM
    ( 2009 G8 WITH RPO BSI Only) 1
    12610768 PCV Tube (2010-2011 Camaro) 1
    Bulletin No.: 10-06-01-008G January, 2013 Page 5
    Warranty Information
    For vehicles repaired under the U.S. (5 years/
    100,000 miles) or Canadian (5 years/160,000 km)
    Powertrain Warranty, use:
    Labor
    Operation Description
    Labor
    Time
    J7555*
    Install AFM Oil Deflector,
    Rocker Arm Cover- Left Bank
    and Clean Carbon from
    Cylinder (Camaro Only)
    6.5 hrs
    Install AFM Oil Deflector,
    Rocker Arm Cover- Left Bank
    and Clean Carbon from
    Cylinder (Aluminum Block V8)
    (RPOs L94, LZ1, L99, LC9,
    LH6, L76, LFA, L92)
    4.1 hrs
    Clean Carbon from Cylinder
    and Install Rocker Arm Cover -
    Left Bank (Cast Iron Block V8)
    (RPOs LMG, LY5)
    2.6 hrs
    Install AFM Oil Deflector,
    Rocker Arm Cover- Left Bank
    and Clean Carbon from
    Cylinder (4WD)
    5.2 hrs
    Install AFM Oil Deflector,
    Rocker Arm Cover- Left Bank
    and Clean Carbon from
    Cylinder (G8 Only)
    5.7 hrs
    *This is a unique labor operation for bulletin use only. It will
    not be published in the Labor Time Guide.
    GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
    technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
    service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
    job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
    vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
    information.
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    TECHNICIAN
    CERTIFICATION
     

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