The engine water pumps need to be inspected on certain D11R Tractors; 776D Tractors; 777D and 793C Trucks; 992G Wheel Loaders; and 3508, 3508B, G3508, 3512, 3512B, G3512, 3516, 3516B, G3516, G3524, and G3532 Engines. Water pumps that do not have a "W" stamped on the pump to indicate that they have been reworked previously need to be disassembled to clean the taper where the impeller mounts. If the taper is not properly cleaned before tightening the nut the impeller can turn on the shaft and result in overheating.

Dealers will need to order parts for this Program.

***** Parts Stock *****

Remove all 166-4377, 166-4378, 166-4379, 166-4380, 166-4381, and 1664382 Water Pumps from dealer parts stock and inspect them for a "W" stamped in the casting. If there is no "W" stamped in the casting at the curved outlet portion of the pump refer to the procedure for reworking the Affected Product and Spare Engine water pumps to remove the impeller and clean the tapers.

***** Affected Product/Spare Engines *****

1. Drain the coolant out of the engine. (If required)
2. Remove the elbow on the front of the water pump.
3. Remove the 3 nuts on the adapter at the front of the pump.
4. Remove the impeller shaft self locking nut and washer.
5. With a puller, carefully extract the impeller out of the pump shaft
6. Clean the bore of the impeller and the shaft taper with an oil removing solution.
7. Carefully reinstall the impeller and new self locking nut on the pump shaft.
8. Torque the impeller nut to 200Nm. Then back off the nut and re-torque nut to 225Nm.

NOTE: Certain engines may require significant amount of piping and bracket removal to gain access to the water pump. A maximum of 2 additional hours is allowed to be claimed with a claim story submitted.

9. Lubricate the 'O ' ring on the front adapter before installation.
10. Installed the 3 nuts on the adapter on the front of the pump.
11. Install the elbow.
12. Stamp a 'W' marking on the curve outlet portion of the pump.
13. If the engine is provided with 2 water pumps, repeat the above procedures for the second water pump.
14. Fill the engine with coolant. (If required)

U.S. and Canadian owners will receive the attached Owner Notification.

***** Parts Stock Water Pumps *****

Submit one claim for all 166-4377, 166-4378, 166-4379, 166-4380, 166-4381, and 1664382 Water Pumps from dealer parts stock that were reworked. One (1) hour labor and one (1) 6V8287 Self Locking Nut will be allowed for each water pump from parts stock that is reworked.

***** Spare Engines *****

Submit one claim for all spare envines from dealer parts stock that were reworked. Two (2) hours labor and one (1) 6V8287 Self Locking Nut will be allowed for each spare engine that is reworked.

***** Affected Product *****

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

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

Dear Caterpillar Product Owner:

The engine water pumps need to be inspected on the products listed below. Water pumps that do not have a "W" stamped on the pump to indicate that they have been reworked previously need to be disassembled to clean the taper where the impeller mounts. If the taper is not properly cleaned before tightening the nut the impeller can turn on the shaft and result in overheating.

Contact your local Caterpillar dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service. Please refer the dealer to their Service Letter dated November 25, 2000 when scheduling this service. You will not be charged for the service performed.

We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to November 25, 2000 Service Letter