CORE GP-OIL COOLER 4W0413 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR INCREASING THE LUBRICATION TO THE VALVE TRAIN ON CERTAIN LOW SPEED 3406B GENERATOR SET, INDUSTRIAL, AND MARINE ENG INES - PS4632 - MAILED US AND CANADA, CACO, CFEL, MARINE TEPS, LIMITED COFA, LIMITED COSA
  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.
June 1, 1991 U-111 A-79 AU-66.1 E-70 O-82.1 TM-10 PRODUCT SUPPORT PROGRAM FOR INCREASING THE LUBRICATION TO THE VALVE TRAIN ON CERTAIN LOW SPEED 3406B GENERATOR SET, INDUSTRIAL, AND MARINE ENGINES 1101 PS4632 This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4632" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
June 30, 1992
Problem
Lubrication to the area surrounding the bridge assemblies and the valve springs can be increased on certain low speed 3406B Generator Set, Industrial, and Marine Engines. Increasing the lubrication to these areas will extend the service life of the components by reducing wear at the valve guides, at the contact point between the rocker arms and the bridge assemblies, and at the contact point between the bridge assemblies and valve stems. Worn parts need to be replaced on