PSP FOR WATER PUMP SEAL FAILURES IN 3406...92U, 3406B...7FB TRUCK ENGINES - MAILED US AND CANADA, COSA, TRUCK TEPS Caterpillar

PSP FOR WATER PUMP SEAL FAILURES IN 3406...92U, 3406B...7FB TRUCK ENGINES - MAILED US AND CANADA, COSA, TRUCK TEPS

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Caterpillar: Confidential Yellow

PSP FOR WATER PUMP SEAL FAILURES IN 3406...92U, 3406B...7FB TRUCK ENGINES - MAILED US AND CANADA, COSA, TRUCK TEPS

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.


PRODUCT SUPPORT PROGRAM FOR WATER PUMP SEAL FAILURES IN 3406 (92U) AND 3406B
(7FB) TRUCK ENGINES, 1361, PS0322
U-107
O-56
TT-8
NOTE: This Service Letter replaces the September 11, 1986 Service Letter
(PSO231). Cross out the September 11, 1986 Service Letter. The September 11,
1986 Service Letter was not distributed to dealers in Caterpillar Overseas S.A.
This Program can only be administered after a failure (leak) occurs. A leak is
indicated when there is a continuous and prolonged trickle that causes puddling
under the truck when it's parked. A small amount of coolant leakage across the
face of the seal is normal and necessary to provide lubrication. When
reporting the repair, use "PS0322" as Part Number and "7755" as Group Number.
Although products in the field are to be administered as described above,
dealers should purge parts stock immediately.

Termination Date

August 31, 1989

Problem

The water pump used on the Affected Product has caused customer dissatisfaction
because of a short service life of the water seal.
Failures of the water seal can be caused by the use of high silicate antifreeze
and/or by a too high concentration of corrosion inhibitors. The customer is
expected to maintain the cooling system as recommended in the Operation and
Maintenance Management Guide.

Affected Product

Model Identification Number
3406 Truck Engine 92U1 - 66443
3406B Truck Engine 7FB1 - 66627, 68323-83347

Parts Needed

1 - 4F7387 Seal
1 - 4K6804 Seal
1 - 9M5894 Seal
1 - 0R2400 Water Pump Group

Action Required

Parts Stock
Remove all 0R1200 and 7W7019 Water Pump Groups from parts stock.
Affected Product
Perform Steps 1 and 2 before the new water pump is installed.
1. Add 2 liters (2 qt) of 6V4511 Caterpillar Cooling System Cleaner to the
radiator. Operate the engine for approximately 30 minutes with the cleaner in
solution.
2. Drain and flush the cooling system completely with clean water.
3. Remove the water pump and install the 0R2400 Water Pump Group and seals.
4. Fill the cooling system with Caterpillar antifreeze (or an equivalent) and
cooling system inhibitors as recommended in the Operation and Maintenance
Management Guide.
WARRANTY ALLOWANCES
Submit one claim for all 0R1200 and 7W7019 Water Pump Groups removed from parts
stock.
(SEE ILLUSTRATION)

Parts Disposition

Return all 0R1200 and 7W7019 Water Pumps removed from parts stock and all
failed water pumps according to instructions for warranty return of
remanufactured parts.