CASE-TRANSMISSION 3858826 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR INSTALLATION OF NEW HARDENED OIL PUMP RELIEF VALVE GUIDE - TURBOCHARGED 3208 ENGINES - PS0221 - MAILED US AND CAN ADA, CACO, COFA, CFEL, COSA, BRAZIL, TRUCK TEPS, MARINE TEPS, AGRICULATURE TEPS
  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 INSTALLATION OF NEW HARDENED OIL PUMP RELIEF VALVE GUIDE Turbocharged 3208 Engines, 1315, 1304, PS0221 U-39 A-24 AU-31 B-13 C-36 E-21 O-27 TT-2 TA-2 TM-2 Problem There has been unusual wear of the oil pump relief valve guide in some applications. See Illustration 1. A wear step in the guide can prevent full travel of the relief valve plunger and cause high oil pressure during cold starts. See Illustration 2. The high oil pressure may cause the oil filter gasket to rupture, resulting in loss of oil and possible engine damage. A new heat treated guide with a slightly different hole pattern is now used in production. ILLUSTRATION 1 (SEE ILLUSTRATION) ILLUSTRATION 2 (SEE ILLUSTRATION) Unusual wear has not