78996A12 Mercury PISTON RING ASSEMBLY

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PSP FOR REPLACING THE IGNITION TUBE SEAL ON CERTAIN 3408B AND 3412B SI ENGINES - PS4522 - MAILED US AND CANADA, CACO, COFA, CFE L, COSA
  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.
U-167 A-114 AU-108 E-100 O-127 1106, 1555 PS4522 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 "PS4522" as Part Number, "7755" as Group Number, and "96" as Description Code. Although this Program is to be administered as described above on the Affected Product, parts should be removed from parts stock as soon as possible. Termination Date
August 31, 1991
Problem
Leaks may occur between the ignition tube and the valve cover on certain 3408B and 3412B SI Engines. Seals made of a new material that are more resistant to deterioration can be installed.
Affected Product
Model Identification Number 3408B 6NB1-763 3412B 7DB1-517
Parts Needed
1 - 7E0079 Seal (Quantity per cylinder)
Action Required
***** Parts Stock ***** Remove all 7W4358 Seals from parts stock. ***** Affected Product ***** Follow the procedures in the Service Manual and replace the existing 7W4358 Seals with 7E0079 Seals.
Service Claim Allowances
***** Parts Stock ***** Submit one claim for all 7W4358 Seals removed from parts stock. ***** Affected Product ***** Product Caterpillar Dealer Suggested Customer Suggested smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (C/L) (Sell) 0-10,000 100% 0 0 0 0 2 This is a 2-hour job.
Parts Disposition
Any parts removed (with the exception of cores used for Caterpillar Remanufactured parts) can be rendered useless and scrapped immediately upon completion of the repair.