| 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:
- First Pass -- 40 N·m (30 lb ft)
- Second Pass -- 70 Degrees
- Third Pass -- 60 Degrees
- 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)
