Product Support Program For Reworking Certain 3406C Truck Engines With Low Power Complaints Caterpillar

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 "PS0795" 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.

NOTE: This Revised Service Letter replaces the October 26, 1994 (Revised November 1995) Service Letter. Changes have been made to the Service Claim Allowances.

Termination Date

Problem

A loss of fuel rate may cause a low power complaint in certain 350, 400 and 425 horsepower 3406C Truck Engines.

Affected Product
Model & Identification Number

3406 (3ZJ49797-Up)

NOTE: For 3406C Engines, 3ZJ49797-3ZJ52109, only engines rated at 425 HP @ 1900 RPM with 2T6216 and 2T6217 Performance Specifications are affected by this program.

For 3406C Engines, 3ZJ52110-Up, engines rated at 425 HP @ 1900 RPM and 400 HP @ 1800 RPM are included in this program.Brakesaver engines with 2T6451 Performance Specifications are not included in this program.For 3406C Engines, 3ZJ52054-Up, all engines rated at 350 HP @ 1800 RPM, are included in this program.

Parts Needed

1 - 1210170 Engine Identification Plate

6 - OR8242 Nozzle (for 350 HP rating)

6 - OR8243 Nozzle (for 400 and 425 HP rating)

Action Required

1. Rack Adjustment: Find the original factory rack settings using the valve cover identification place or TMI. If the valve cover plate has had previous modifications, use TMI GKN401-06-ESRS (OT's) Specification List. find the original factory FLS and FTS specifications. Add .52 to the FLS and .72 to the FTS settings. Use these as the new rack settings. See steps 4 and 5 for documentation. No fuel rate testing is required.

2. Replace the nozzles with the reman part numbers listed above.

3. Seal the governor and etch or stamp PS0795-1 (the service letter program number) onto the rear governor housing as shown in the Illustration below.

4. Document the rack setting changes in the service letter SIMS entry.

5. Also etch or stamp the new rack settings and other engine information on a new 1210170 Engine Information Plate and glue the plate over the original valve cover plate using 3S6252 Silicon Adhesive.

Service Claim Allowances

Parts Disposition

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