FILTER-AIR 4969845 - Caterpillar

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0927" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
This Revised Service Letter replaces the April 17, 1996 (Revised May 1996) Service Letter. Changes have been made to the Action Required, and Service Claim Allowances.
Termination Date
April 30, 1997Problem
The G3500 Series water cooled manifold riser tube flange to cylinder head gasket leaks. This started when the engine became asbestos free. Asbestos free gasket materials have a tendency to creep with heat, load, and time. The 8N7640 Non-Asbestos Gasket leaked due to creep and was replaced with a high temperature non-asbestos material, 1104789/">1104789. This material worked very well in the co-gen applications but developed serious leaks when used in the standard temperature applications. Engineering has now released a metal spacer plate with an integral molded high temperature Highly Saturated Nitrile (HSN) O-Ring bonded to the inner opening of this plate. Field tests have determined that this design will resolve the problem.
Affected Product
Model & Identification Number
G3508 (2JF112-388, 9TG12-96, 4WD12-14)
G3412 (4KC90-616, 5JD12-29, 7NJ12-168)
G3516 (4EK12-831, 8LD12-37, 3RC17-1177)
Parts Needed
1 - 1272176 SEAL (PER CYLINDER)Action Required
1. Inspect the engine for leaking riser tube gaskets.2. If the engine has had the riser tube gaskets replaced using the 1104789 Gasket and one or more of these gaskets are leaking, rework the entire set of riser tubes using the new 1272176 Integral Seal.3. Inspect the riser tube surface after it is removed to insure adequate flatness.4. Refinish the sealing surface if necessary.Service Claim Allowances
Allow .2 hours for each gasket replaced.
If the engine has had the riser tube gaskets replaced using the 1104789 Gasket, use 0-6000 hours from the time of the gasket replacement for eligibility.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.