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PSP FOR REPLACING FAILED CYLINDER HEAD GASKETS ON CERTAIN 3406B TRUCK ENGINES - EFFECTIVE OCTOBER 09, 1990 - PS6040 - THI S SL CANCELS AND REPLACES APRIL 12, 1990 (REVISED AUGUST 1990) SL - PS0450 - MAILED US AND CANADA, COFA, CFEL, TRUCK TEPS, LIMITED COSA - REVISED 12/91
  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.
December 3, 1990 (Effective October 9, 1990) (Revised December 1991) U-240 AU-151 E-146 O-183.3 TT-19 PRODUCT SUPPORT PROGRAM FOR REPLACING FAILED CYLINDER HEAD GASKETS ON CERTAIN 3406B TRUCK ENGINES 1124 PS6040 This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS6040" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code. This Revised Service Letter replaces the December 3, 1990 (Revised March 1991) Service Letter. Changes have been made to include the October 31, 1991 Service Letter Supplement. Additional changes were made to the Termination Date, Action Required, Service Claim Allowances, and Parts Disposition. Termination Date
March 31, 1992
Problem
The cylinder head gasket may fail on certain 3406B Truck Engines and result in damage to the cylinder block, spacer plate, and/or cylinder head.
Affected Product
Model Identification Number 3406B 7FB86000-Up 8SB1695-2514 7XC408-1549 8TC1-8518 4MG1-62276
Parts Needed
*1 - Gasket Kit-Cylinder Head 1 - Gasket-Oil Pan **1 - 9L5854 Band (Filler) ***1 - 5N0093 Insert (.106") **2 - 7E5665 Retainer **3 - 6V5121 Seal ***1 - 2W3815 Insert (.060") **1 - 2W8601 Plate-Spacer **1 - 7W3550 Liner ***1 - 9Y3368 Insert (.030") **1 - 9Y9497 Rod Bearing * Part number varies by application. See the parts book microfiche and choose the appropriate gasket kit. Make sure the gasket kit contains the 7E6000 Cylinder Head Gasket. ** Quantity listed is per cylinder. *** Use as required.
Action Required
Refer to the following reference articles: #1 Service Magazine, August 6, 1990, "Coolant Loss In 3406B Truck Engines" #2 "Know Your Cooling System" SEBD0518 pages 22 and 23 #3 Service Magazine, November 26, 1990, "Service Tips for Piston Cooling Jets (Tubes)" #4 Service Magazine, November 14, 1988, "New Liner Seat Available For 3400 Engines" #5 Special Instruction SMHS8222 "Installation of 2W3815 or 5N0093 Inserts" #6 Guideline for Reusable Parts SEBF8131 "Spacer Plates for 3400 Engines" #7 Guideline for Reusable Parts SEBF8049 "Pistons" - page 25 #8 Guideline for Reusable Parts SEBF8051 "Piston Pins and Retaining Rings" #9 Service Magazines, January 30, 1989 "Head Gasket Replacement Guidelines" and "Liner Projection" #10 Applied Failure Analysis - Threaded Fasteners SEBV0545 Steam clean the engine if needed. Perform the "bottle test" for exhaust gas leakage as described in "Know Your Cooling System" SEBD0518 pages 22 and 23. Record the results in the service report. If no exhaust gas leakage is evident with the "bottle test", this Program does not apply. Check the timing advance unit operation with the 6V3100 (or 8T5300 & 8T5301 Adapter) Timing Indicator Group. Check all fuel settings on governors that are not factory sealed and record the before and after settings in the service report. This Program cannot be applied to engines operating out of factory specifications. Remove the cooling jets and inspect per reference #3. Remove all six cylinder packs from the engine using the 6V9448 Puller. Inspect the flatness of the cylinder head and block per the Service Manual Specifications.