CYLINDER BLOCK AS 2021257 - Caterpillar

Caterpillar: Confidential Yellow
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.
This Revised Service Letter replaces the July 13, 1995 Service Letter. Changes have been made to the Problem and Action Required.
Termination Date
October 31, 1995Problem
A 1270890 Standpipe needs to be installed in all 0R3789, 0R3790, 0R4120, 0R4121, 6I3890, 1025939, 1025941 and 1009344 Water Pump Assemblies used on 3406 Engines.
Parts Needed
1 - 1270890 StandpipeAction Required
1. Remove the 1085959 Filter from the water pump weep hole. Make sure the filter is removed as this could make the standpipe ineffective.
2. Insert the new 1270890 Standpipe in the weep hole until the standpipe cap contacts the machined surface of the water pump housing. 3. Use a inch wrench to hold the cap while turning the inch hex socket counterclockwise. Tighten the cap to a torque of 3.5 0.5 N m (31 4 lb. in.).Service Claim Allowances
Submit one claim for all 1270890 Standpipes installed in water pumps in Parts Stock. Also, claim for .3 hour of labor at your sell rate for each water pump reworked.
US and Canadian Dealers Only - When submitting a Parts Stock claim use 99Z00007 in the Product Identification Number Field.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.