SEAL-BUFFER 1709839 - 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 "PS5337" 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.
Termination Date
October 31, 1998Problem
The exhaust valves within a specific range of engine serial numbers are susceptible to sticking in the valve guide in very early hour operation.
Affected Product
Model & Identification Number
12H (4XM1032-1306 8MN460-462 2GS300-317 4ER364-367 2WR527-593 )
14H (7WJ382-551)
140H (2ZK1478-2012 5HM674-770 5HM800-987 9TN120-244 9ZN126-169 3AS400 )
143H (1AL255-263)
160H (9EJ370-380 2FM350-354 )
163H (5AK106-131)
966F (1SL2234-2468)
970F (7SK800-848)
D4E SR (2DJ1872-1898)
D5E (9RG373-383)
D6G PS (2MJ2703-2751)
D6G SR (3SR47-77)
D6R (5LN509-652 8LN423-434 2YN427-444 3ZN450-489 )
D6R DS (7GR428-454)
D6R FTC (6MR434-453)
D6R LGP (9PN459-546)
D6R XR (7KN421-426)
D7R (3DN226-237 2EN360-419 2HR639-675 )
65D (2ZJ2397-2480)
330B (6DR645-960)
350 (3ML950-1004)
815F (1GN306-361)
816F (5FN308-327)
615C (9XG848-900)
627F (4YK327-365)
525 (1DN1055-1146)
528B (8SJ379-396)
Parts Needed
1 - 1043016 Gasket Kit (for 525 and 528B)1 - 1256730 Gasket Kit (for D7R)1 - 1301950 Gasket Kit (for D6R, 12H, 14H, 140H, 143H, 160H and 163H)1 - 1343040 Gasket Kit (for 966F, 970F, 330B, 350, 815F, 816F, 615C and 627F)1 - 1363689 Gasket Kit (for 65C)6 - 1487502 Valve Guide (for all models)Action Required
Parts Stock
Remove all 1090390 and 1167553 Valve Guides from Parts Stock.
Affected Product
Replace all failed exhaust valves, guides, push tubes, and lifters, and any other damaged iron that might be collateral as necessary.
Replace all remaining exhaust valve guides. Use only new 1487502 Guides in this rework.
Do not attempt to ream guide holes to size per earlier TIB dated April 2, 1997 titled "Exhaust Valve Sticking Failures".
Service Claim Allowances
Parts Stock
Submit one claim for all 1090390 and 1167553 Valve Guides removed from Parts Stock.
Affected Product
This is a 20-hour job.
Parts Disposition
TEPS/MEPS Dealers must return the affected part(s) to their Caterpillar dealer.
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.