For 1990-2009 cars

# SMU - Cylinder Head Tightening Specification Clarification

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

| 1999 Marine

| 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)