Engine - Torque to Yield Head Bolts
Bulletin 85-6-17Date June, '85
Ref. No. 85-249-6
SUBJECT: "TORQUE TO YIELD" HEAD BOLT
MODELS AFFECTED: 1985 CENTURY AND ELECTRAS WITH 3.8L MFI (VIN CODE 3) ENGINES
"TORQUE TO YEILD" HEAD BOLT:
On approximately February 25, 1985, "Torque To Yield" head bolts similar to those used on the 1985 3.0L (VIN Code L) engine were introduced into production on 3.8L MFI (VIN Code 3) engines.. The illustration below identifies the differences between the carryover design and new torque to yield bolt. Installation instructions for the new bolt are the same type as those provided in Bulletin 85-6-3 dated November 1984 for the 3.0L (VIN Code L) engine.
The 3.8L MFI engine which uses two different bolt lengths can be resassembled using either the carryover design bolt or the new one, but they should not be intermixed.