Engine - Revised Head Bolt Torque Procedure

Bulletin No. T 85-93
File in Group 6A
Number 72
Corp. Ref. No. 8054268
Date July '85
SUBJECT: HT4100 ENGINE REVISED HEAD BOLT TORQUE PROCEDURE

MODELS AFFECTED: 1982-1985 ELDORADOS, SEVILLES, FLEETWOODS, DEVILLES AND BROUGHAMS

A revised head bolt torque procedure has been developed for all vehicles equipped with an HT4100 engine. This new procedure supersedes all previously published information.

Torque Procedure:

The revised head bolt torque sequence and bolt torques are shown in the figure below.
IMPORTANT: Lubricate all bolts with camshaft and lifter lube (P/N 1052365) or equivalent prior to installation.

1. Torque all bolts in above sequence to 50 N.m (38 ft.lbs.).

2. Torque all bolts in same sequence to 100 N.m (74 ft.lbs.).

3. Torque bolts 1, 3 and 4 to 120 N.m (90 ft.lbs.).

This updated procedure should be followed whenever cylinder head installation is required.