Product Support Program For Replacing Intake And Exhaust Valve Bridges On Certain C-10, C-12, 3176, 3176B, 3176C And 3196 Engines And Challenger 75D And 85D Agricultural Tractors Caterpillar

Product Support Program For Replacing Intake And Exhaust Valve Bridges On Certain C-10, C-12, 3176, 3176B, 3176C And 3196 Engines And Challenger 75D And 85D Agricultural Tractors

Usage:

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Caterpillar: Confidential Yellow

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 "PS4075" 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.

Termination Date

July 31, 1998

Problem

Intake and exhaust valve bridges need to be replaced on certain C-10, C-12, 3176B, 3176C and 3196 Engines and Challenger 75D and 85D Agricultural Tractors.

Affected Product
Model & Identification Number

C-10 (2PN3679-4632)

C-12 (1YN5561-7604)

3176B (9CK32686-32702 9WK784-802 3NL454-486 )

3176C (2AW212, 2AW213)

3196 (2XR522-637 1DW480 )

75D (5AR391-483)

85D (4GR551-682)

Parts Needed

Non Jake Brake Engines

12 - 1442913 Bridge Assembly

Jake Brake Engines

6 - 1442913 Bridge Assembly

6 - 1442914 Bridge Assembly

Action Required

Replace all valve bridges with new parts: 1442913 (standard), 1442914 (exhaust with hole for Jake Brake screw).

If the engine has Jake Brake, transfer six Jake Brake screws from the old exhaust valve bridges to the new exhaust valve bridges.

See the attached rework procedure.

Service Claim Allowances

Labor Breakdown By Cab Type

NOTE: Marine, Industrial, and Challenger times may include additional labor time (reasonable/actual) for difficult engine access. Claim these times using 1121-500.

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Attach.

(1-Rework Procedure)

Rework Procedure

NOTE: All references to Service Manuals relate to C-10 and C-12 Truck Engines.

1. Check to see if rework was completed prior to shipment: If "QK" is stamped on block near serial number plate, then do not rework.If not stamped, then proceed with the rework procedure.

2. Remove valve covers. Reference the Disassembly & Assembly Manual, SENR1002-01.

3a. Put #1 piston at top center (TC) on the compression stroke. Replace bridges on the following cylinders:

Follow the Replacement/ResetGuidelines listed below.

3b. Rotate flywheel 360 degrees to put #6 piston at top center (TC) on the compression stroke. Replace bridges for the following cylinders:

Follow the Replacement/ResetGuidelines listed below.

Replacement/Reset Guidelines

Transfer Jake Brake actuator screws from old to new exhaust bridges.

NOTE: Reference January 1994 Truck Engine News or November 1996 Tech Tips, LEVN3899, for correct procedure to set pin depth so that bridges will be level when installed on engine.