CORE AS 8N9135 - Caterpillar

October 4, 2002
(Revised November 2002)
U-267
beforeor
after failure PRODUCT SUPPORT PROGRAMFOR INSPECTING AND/OR REPLACING THE VALVE SPRINGS THAT MAY BREAK ON CERTAIND5M AND D6M TRACK TYPE TRACTORS
1108 PS41143
This Program can be administered eitherbefore or after failure. In either case the decision whether to apply theProgram is made by the dealer. When reporting the repair, use "PS41143"as the Part number and "7755" as the Group Number. If administered beforefailure, use "56" as the Warranty Claim Description Code and use "T" asthe SIMS Description Code. If administered after failure, use "96" as theWarranty Claim Description Code and use "Z" as the SIMS Description Code. The information supplied in this serviceletter may not be valid after the termination date of this program. Donot perform the work outlined in this Service Letter after the terminationdate without first contacting your Caterpillar product analyst. This Revised Service Letter replacesthe October 4, 2002 Service Letter. Changes have been made to the ServiceClaim Allowances.
Termination Date
October 31, 2004
PROBLEM
The valve springs need to be inspected and mayneed to be replaced on certain D5M and D6M Track Type Tractors. Some 7C4273Valve Springs were from an alternate supplier and may break. These springscan be identified by a light yellow paint stripe as a color code.AFFECTED PRODUCT
Model Identification Number
D5M 5ES258-787
6AS142-409
7LR199-308
D5M XL 4JS211-395
D5M LGP 5FS200-258
D6M 4HS421-492
5NR235-357
D6M XL 2YS320-458
D6M LGP 4GS251-286 The affected Product IdentificationNumber Ranges identified in the charts are approximate. There may be afew affected machines that are outside of these ranges and some machineswithin the ranges may have already been done. It is not necessary to do this inspectionif it has already been inspected because of prior failures or as a resultof the TIB (refer to TIBU2880, dated October 6, 1999).PARTS NEEDED
12 - 7C4273 Spring - Valve
1 ? 1192940 Gasket - Valve Cover
ACTION REQUIRED
Visually inspect the engine for valve spring breakageand the light yellow valve spring color code when performing a scheduledvalve lash check, fuel timing check, or any time the valve cover of theengine is removed. Inspect the 7C4273 Valve Springs to determine if ithas a light yellow paint stripe. If a valve spring has a light yellow paintstripe or if a valve spring has already broken, replace all of the 7C4273Valve Springs in that engine.If there was no damage from the broken spring,it is not necessary to remove the cylinder head. For replacing the valvesprings without removing the cylinder head refer to the Service Magazinedated May 15, 1989, Page 5, "New Valve Stem Seal Used On Inlet Valves AndAdded To Exhaust Valves". The Parts Required include twelve 7C4273 ValveSprings and a new 1192940 Valve Cover Gasket.Note: If there was no damage from the brokenspring, it is not necessary to remove the cylinder head. It is not necessary to do this inspectionif the valve springs have already been inspected because of prior failuresor as a result of the TIB (refer to TIBU2880, dated October 6, 1999).SERVICE CLAIM ALLOWANCES
Product smu Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs Parts Labor Hrs Parts Labor Hrs
0-5000 100% 3 0 0 0 0
This is a 3?hour job to inspect thevalve springs. An additional 5 hour will be allowed to replace all thevalve springs.PARTS DISPOSITION
Handle the parts in accordance with