Product Support Program For Timing Gear Housing Gasket Leaks On Certain Challenger 75 Tractors And 3176 Truck Engines Caterpillar

Product Support Program For Timing Gear Housing Gasket Leaks On Certain Challenger 75 Tractors And 3176 Truck Engines

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 only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0570" 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

December 31, 1993

Problem

The 7C8255 or 4P8165 Gasket, located between the timing gear housing and the spacer block, may leak on certain Challenger 75 Tractors and 3176 Truck Engines.

Affected Product
Model & Identification Number

Challenger 75 (4CJ1-479)

3176 (2YG1-Up; 7LG1-9753)

Parts Needed

4 - 9Ml974 Washer

4 - 9U5177 Inserts (use only if needed)

4 - 6V2317 Bolt

1 - 7X7973 Gasket Kit^*

1 - 1011286 Plate

1 - 1011287 Gasket

^*Do not use the existing 7C8255 or 4P8165 Gasket from the gasket kit. Replace it with a 1011287 Gasket.

Action Required

If a 7C8255 or 4P8165 Gasket leaks, disassemble the engine to allow access to the gasket. Inspect the spacer block to determine if 9U5177 Inserts have been installed in the 4 bolt holes. If 9U5177 Inserts have been installed, replace the leaking gasket with a new 7X7973 Gasket Kit, 1011287 Gasket, 1011286 Plate, and 4-6V2317 Bolts.

The following steps are required when installing the new gasket and plate:

A) Install the gasket dry and non-beaded side toward spacer deck.

B) Install plate on 9Y3592 Front Housing Cover using 4- 6V2317 Bolts and 4-9M1974 Washers. Tighten the bolts to a torque of 28 ± 7 N·m - standard torque.

NOTE: Gasket is not symmetrical and is installed in only one position.

NOTE: Install the new 1011287 Gasket with the non-beaded side toward the spacer deck.

If it is determined that the 9U5177 Inserts have not been installed, follow the steps below to install inserts into the spacer block:

1. Drill each bolt hole with a 8.33 mm (.328'1) dia. drill bit to a depth of 25.4 ± 1.6 mm. (1.0 ± .06 in.).

2. Thread each bolt hole with an 8T2789 Tap to a minimum depth of 18.3 mm. (.72 in.).

NOTE: Use thread lubricant during the threading operation.

3. Install four 9U5177 Inserts using an 8T2790 Tool.

4. Assemble the engine using the new gasket as noted above.

After performing the rework, stamp the letters "CG" next to the identification number on the engine identification plate to indicate the rework has been completed.

Illustration 1 - Spacer Deck - Front View