Engine - Cylinder Head Tightening Specs Clarification

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 99-06-01-016

Date: October, 1999

SERVICE MANUAL UPDATE

Subject:
Cylinder Head Tightening Specification Clarification

Models:
1993 Cadillac Allante, Sixty Special (FWD)
1993-96 Cadillac Fleetwood
1993-99 Cadillac DeVille, Eldorado, Seville
1994-99 Cadillac Concours
1995-99 Oldsmobile Aurora
with 4.0 L or 4.6 L Engine (VINs C, Y, 9 - RPOs L47, LD8, L37)








This bulletin is being issued to clarify the cylinder head tightening specification listed in the following procedures in the Engine Mechanical 4.0 L and 4.6 L sections of the appropriate Service Manuals:

^ Specifications - Fastener Tightening Specifications

^ Cylinder Head Replacement - Installation Procedure

^ Cylinder Head Installation

The torque specification and sequence for the cylinder head bolts (1--10) using J 36660-A is:

1. First Pass - 40 N.m (30 lb ft)

2. Second Pass - 70 Degrees

3. Third Pass - 60 Degrees

4. Fourth Pass - 60 Degrees (190 Degrees total) The torque specification for the three front M6 cylinder head bolts is:

12 N.m (106 lb in)