Any info on TSB for leaking diff.?
Thread Starter
Burning Brakes
Joined: Jul 2002
Posts: 869
Likes: 0
From: Nashville TN
Re: Any info on TSB for leaking diff.? (C-5 TECH)
Well, about a week ago I read on a post that a TSB had been issued in July. I have no idea where the post is though. This is the second time mine is going in for this problem. What can be done to make the fix permanent? :confused:
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
Re: Any info on TSB for leaking diff.? (1g1yy)
They have revised the procedure to fix the seal... I guess they so many returns they neede to do something different...This revision took place on 7/18/2002
SMU - Revised Side Cover and Gasket Replacement (RH)/Differential Carrier Cover and Seal Replacement - Right #02-04-20-003
Revised Side Cover and Gasket Replacement (RH)/Differential Carrier Cover and Seal Replacement - Right
1997-2002 Chevrolet Corvette
This bulletin is being issued to revise the Side Cover and Gasket Replacement (RH)/Differential Carrier Cover and Seal Replacement - Right procedure in the Rear Drive Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI2000. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Side Cover and Gasket Replacement (RH) (1997-2000 Model Years)/Differential Carrier Cover and Seal Replacement -- Right (2001-2002 Model Years)
Tools Required
J 36797 Output Shaft Seal Installer
J 42168-16 Spacers
J 42170 Bearing and Race Installer
J 42194 Bearing and Race Remover
Removal Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the RH rear tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Remove the RH wheel drive shaft. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
Remove the RH muffler assembly. Refer to Muffler Replacement in Engine Exhaust.
Drain the fluid from the differential. Refer to Lubricant Change.
Clean any dirt or debris from around the differential cover (right).
Remove the bolts retaining the differential cover (right).
Remove the transmission vent tube retainer (automatic transmission).
Remove the differential cover (right) from the differential.
Remove and discard the axle seal (1), and O-ring seal (4) from the differential cover (right).
Install the J 42194 into the differential cover (right), in order to remove the bearing race and shims. Position the cover into a hydraulic press.
Using a hydraulic press, remove the bearing race (1) and shims (2). Mark or tag the shims for assembly.
Important
Whenever service requires the replacement of the right side differential cover, the covers MUST be measured and the right side shim pack adjusted to compensate for machining tolerances between the two components. Failure to perform this measurement procedure may result in improper differential bearing preload.
Use a caliper (2), a straight edge (1), and J 42168-16 (3) in order to measure the NEW differential cover bore dimension. Record the measurement as value A.
Use a caliper (2), a straight edge (1), and J 42168-16 (3) in order to measure the old differential cover bore dimension. Record the measurement as value B.
Subtract value B from value A. If the computation is a positive value, add shims equal to the value, to the existing shim pack. If the computation is a negative value, subtract shims equal to the value, from the existing shim pack.
Installation Procedure
Install the selected shims (2) and the bearing race (1) to the NEW cover (right).
Press the shims and bearing race into the NEW cover (right) using the J 42170 and a hydraulic press.
Clean the O-ring sealing surface on the differential cover (right) and the differential housing.
Install a new O-ring seal (4) to the differential cover (right).
Install the differential cover (right) to the differential.
Notice
Refer to Fastener Notice in Cautions and Notices.
Install the differential cover (right) retaining bolts. Tighten
Tighten the differential cover (right) retaining bolts to 25 N·m (18 lb ft).
Install the axle seal into the differential cover (right) using J 36797.
Install the transmission vent tube retainer onto the vent tube, then position the retainer to receive the retaining bolt (automatic transmission).
Fill the rear axle differential with the proper fluid and to the proper level. Refer to Lubricant Change.
Install the RH muffler assembly. Refer to Muffler Replacement in Engine Exhaust.
Install the RH wheel drive shaft. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
Install the RH rear tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Lower the vehicle.
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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© Copyright General Motors Corporation. All Rights Reserved.
--------------------------------------------------------------------------------
Document ID # 901212
1999 Chevrolet/Geo Corvette
SMU - Revised Side Cover and Gasket Replacement (RH)/Differential Carrier Cover and Seal Replacement - Right #02-04-20-003
Revised Side Cover and Gasket Replacement (RH)/Differential Carrier Cover and Seal Replacement - Right
1997-2002 Chevrolet Corvette
This bulletin is being issued to revise the Side Cover and Gasket Replacement (RH)/Differential Carrier Cover and Seal Replacement - Right procedure in the Rear Drive Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI2000. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Side Cover and Gasket Replacement (RH) (1997-2000 Model Years)/Differential Carrier Cover and Seal Replacement -- Right (2001-2002 Model Years)
Tools Required
J 36797 Output Shaft Seal Installer
J 42168-16 Spacers
J 42170 Bearing and Race Installer
J 42194 Bearing and Race Remover
Removal Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the RH rear tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Remove the RH wheel drive shaft. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
Remove the RH muffler assembly. Refer to Muffler Replacement in Engine Exhaust.
Drain the fluid from the differential. Refer to Lubricant Change.
Clean any dirt or debris from around the differential cover (right).
Remove the bolts retaining the differential cover (right).
Remove the transmission vent tube retainer (automatic transmission).
Remove the differential cover (right) from the differential.
Remove and discard the axle seal (1), and O-ring seal (4) from the differential cover (right).
Install the J 42194 into the differential cover (right), in order to remove the bearing race and shims. Position the cover into a hydraulic press.
Using a hydraulic press, remove the bearing race (1) and shims (2). Mark or tag the shims for assembly.
Important
Whenever service requires the replacement of the right side differential cover, the covers MUST be measured and the right side shim pack adjusted to compensate for machining tolerances between the two components. Failure to perform this measurement procedure may result in improper differential bearing preload.
Use a caliper (2), a straight edge (1), and J 42168-16 (3) in order to measure the NEW differential cover bore dimension. Record the measurement as value A.
Use a caliper (2), a straight edge (1), and J 42168-16 (3) in order to measure the old differential cover bore dimension. Record the measurement as value B.
Subtract value B from value A. If the computation is a positive value, add shims equal to the value, to the existing shim pack. If the computation is a negative value, subtract shims equal to the value, from the existing shim pack.
Installation Procedure
Install the selected shims (2) and the bearing race (1) to the NEW cover (right).
Press the shims and bearing race into the NEW cover (right) using the J 42170 and a hydraulic press.
Clean the O-ring sealing surface on the differential cover (right) and the differential housing.
Install a new O-ring seal (4) to the differential cover (right).
Install the differential cover (right) to the differential.
Notice
Refer to Fastener Notice in Cautions and Notices.
Install the differential cover (right) retaining bolts. Tighten
Tighten the differential cover (right) retaining bolts to 25 N·m (18 lb ft).
Install the axle seal into the differential cover (right) using J 36797.
Install the transmission vent tube retainer onto the vent tube, then position the retainer to receive the retaining bolt (automatic transmission).
Fill the rear axle differential with the proper fluid and to the proper level. Refer to Lubricant Change.
Install the RH muffler assembly. Refer to Muffler Replacement in Engine Exhaust.
Install the RH wheel drive shaft. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
Install the RH rear tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Lower the vehicle.
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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© Copyright General Motors Corporation. All Rights Reserved.
--------------------------------------------------------------------------------
Document ID # 901212
1999 Chevrolet/Geo Corvette
Former Vendor
Joined: Apr 2001
Posts: 10,976
Likes: 21
From: FL
St. Jude Donor '13
Re: Any info on TSB for leaking diff.? (1g1yy)
There is a TSB that was just released that address replacing the RIGHT SIDE diff cover.The TSB does not address the leak issue that everyone is having...It simply addresses bearing preload when installing a NEW right cover,which is not an issue on the left cover...
If you have a leaky left side cover,I have found that adding a bead of anerobic sealer to the sealing surface in addition to a new o-ring and new axle seal will prevent leakage :yesnod: I have done about 40...
If the anerobic is not applied,good chance that it will leak again.There appears to be a manufacturing defect in the left side cover or the unit itself.The unit is manufactured by Getrag,and they have not addressed this issue :nonod: When the o-ring seal "flattens",fluid passes by the seal,9 out of 10 times it is from the left side cover...
[Modified by C-5 TECH, 8:13 PM 9/8/2002]
If you have a leaky left side cover,I have found that adding a bead of anerobic sealer to the sealing surface in addition to a new o-ring and new axle seal will prevent leakage :yesnod: I have done about 40...
If the anerobic is not applied,good chance that it will leak again.There appears to be a manufacturing defect in the left side cover or the unit itself.The unit is manufactured by Getrag,and they have not addressed this issue :nonod: When the o-ring seal "flattens",fluid passes by the seal,9 out of 10 times it is from the left side cover...
[Modified by C-5 TECH, 8:13 PM 9/8/2002]
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Joined: Aug 1999
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From: Lackey, my own dragstrip VA.
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Re: Any info on TSB for leaking diff.? (C-5 TECH)
The second time around, my dealership listened and did this.........
Tested A-OK after 3K and counting :yesnod:
