SEAL GP-CRANKSHAFT 1228929 - 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 be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4370" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Although this program can be administered as described above, remanufactured engines in dealer inventory should be checked prior to delivery and customer units in service should be checked at the next revisit. This program can not be implemented more than once.
Termination Date
February 28, 1999Problem
When certain 3406E Truck Engines were remanufactured the electronic control module (ECM) was left set on a default fuel injector trim code of 1100. The ECM should be reprogrammed to include the actual fuel injector trim codes.
Affected Product
Model & Identification Number
3406E (4AS96-172)
All engines are 0R8325, 0R8520, 0R8699, or 0R8700 remanufactured 3406E truck engines.
This program is to be adminstered on the above remanufactured engines in dealer inventory prior to delivery and customer units in service should be checked at the next revisit. This program can not be implemented more than once.
Parts Needed
Not Applicable.
Action Required
Check to see if the top of the valve cover is marked PS4370. If not, use an ECAP Service tool to determine if the ECM has already been reprogrammed. This program can not be implemented more than once.
Remove the engine valve covers and record the four digit trim code that is laser burned onto the top of the injector tappet of each injector.
Use the Electronic Control Analyzer Programmer (ECAP) Field Service Tool and enter the four digit trim codes into the ECM Program. The ECAP will prompt the serviceman to enter the codes.
If an injector does not have a trim code on the tappet, enter the default code of 1100.
Mark PS4370 on the top of the valve cover to indicate that this Program was completed.
Service Claim Allowances
This is a 2-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.