Usage:
NOTE: 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.
NOTE: 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 "PS8632" 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.
NOTE: 1996 TEPS mail code TT-6 is not in order since it was added at Revision SEBE5702-01 in May 1996.
NOTE: This Revised Service Letter replaces the April 15, 1996 (Revised October 1996) Service Letter. Changes have been made to the TERMINATION DATE, Affected Product, Service Claim Allowances, and Rework Procedure.
Termination Date
December 31, 1998Problem
This program provides 3176B Engine upgrades in the areas of Jake Brake settings and head bolts. Jake Brake settings have changed from .51mm (.020 inch) to .64mm (.025 inch). This program provides for updating engines that were factory or field adjusted to the .51 (.020 inch) specification. This program also provides an upgrade of the head bolts at the locations that can be replaced without removal of the valve cover base (Group 2 Engines).
NOTE: This program does not apply to bus and coach applications.
Affected Product
Model & Identification Number
Group 1
3176B (9CK1-28128)
Group 2
3176B (9CK1-24731)
NOTE: The Affected Product for the head bolt replacement applies to all serial number from
Parts Needed
Group 2
- 2 - 1261499 Bolt
Action Required
See the attached rework procedure.
Service Claim Allowances
Labor Hours By Cab Type
- IN - International
- SC - Ford LN, L, LS, LA, Short Conventional
- MC- Medium Hood Conventional
- CV - Long Hood Conventional
- CO - Cab Over
- SC - Ford LN, L, LS, LA, Short Conventional
Cab Type
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.
- (1-Rework Procedure)
Rework Procedure
Group 1
NOTE: The Jake Brake Adjustments may be completed more than once under this program.
1. Determine if the engine qualifies for this program. The engine must be equipped with Jake Brakes and be outside the ranges of normal valve adjustment maintenance.
2. Remove the valve covers and truck chassis air piping, air cleaners and other peripheral items for access to the engine brake.
3. Adjust Jake Brakes to .64mm (.025 inch) using procedures listed in Service Manual, SENR5585.
4. Install the valve covers and truck chassis air piping, air cleaners and other peripheral items.
Group 2
NOTE: Inspect the head bolts to verify that the bolts have not already been replaced. If the bolts have been replaced, do not repeat this procedure.
1. Remove a single head bolt at the right hand rear of the engine from position 14, as indicated on the cylinder head Illustration. Use a 24mm thin wall socket (CAT Part Number 1U7883) to access the head bolt.
2. Install the new 1261499 Bolt using 6V4876 Lubricant (Molykote) on the threads and both sides of the washer. Tighten the bolt to 260 ± 15 N·m (190 ± 11 lb ft). Do not use the Service Manual torque specifications because all head bolts have not been removed. A closer match is preferred with the remaining head bolts that have "relaxed" since the original installation.
3. Repeat steps 1 and 2 of Group 2 for the bolt at the right hand front of the engine (position 12 on the Illustration).
