Engine - Corrected Fastener Tightening Specifications

91pontiac18

Bulletin Number: 92-6-14
Reference Number: 136123
Publish Date: 12/91


Subject: SERVICE MANUAL UPDATE - SECTION 6A
3.1L V6 ENGINE FASTENER TIGHTENING
SPECIFICATIONS (CORRECTED)

Models
Affected: 1990-92 6000 AND GRAND PRIX MODELS




The following changes should be made to your copies of these Service Manuals.

Year Car Line Section Page

1990 6000 6A4 6A4-44, 45

1990 Grand Prix 6A5 6A5-49

1991 6000 6A4 6A4-53

1991 Grand Prix 6A5 6A5-59

1992 Grand Prix 6A5 6A5-58

In the 1990 6000 Service Manual, the fastener tightening specifications listed below should read as follows:

Engine Mount to Frame Nut 45 N-m (33 lbs.ft.)
Engine Bracket to Engine - Large Bolt 110 N-m (81 lbs.ft.)
Engine Bracket to Engine - Small Bolt 80 N-m (59 lbs.ft.)
Rocker Arm Nut 24 N-m (18 lbs.ft.)

In the 1990 6000 Service Manual, the figure references listed below should read as follows:

Cylinder Head Bolt Figure 22
Front Cover Bolt Figure 18
Intake Manifold Bolt Figure 10


In the 1990 Grand Prix, Service Manual, the fastener tightening specification for the Rocker Arm Nut should read 24 N-m (18 lbs.ft.).

In the 1990 Grand Prix Service Manual, the Front Cover Bolt figure reference should read Figure 20.

In the 1991 6000 Service Manual, the fastener tightening specifications should read as follows:

Engine Mount to Frame Nut 45 N-m (33 lbs.ft.).
Engine Bracket to Engine Mount Nut 45 N-m (33 lbs.ft.).
Rocker Arm Nut 24 N-m (18 lbs.ft.).
Valve Cover Bolt 10 N-m (89 lbs.in.).

In the 1991 6000 Service Manual, the figure references listed below should read as follows:

Cylinder Head Bolt Figure 27
Front Cover Bolt Figure 23
Intake Manifold Bolt Figure 15

In the 1991 Grand Prix Service Manual, the fastener tightening specifications listed below should read as follows:

Engine Mount to Frame Nut 45 N-m (33 lbs.ft.).
Engine Bracket to Engine Mount Nut 45 N-m (33 lbs.ft.).
Rocker Arm Nut 24 N-m (18 lbs.ft.).
Valve Cover Bolt 10 N-m (89 lbs.in.).

In the 1992 Grand Prix Service Manual, the fastener tightening specifications listed below should read as follows:

Engine Mount to Frame Nut 45 N-m (33 lbs.ft.).
Engine Bracket to Engine Mount Nut 45 N-m (33 lbs.ft.).
Rocker Arm Nut 24 N-m (18 lbs.ft.).
Valve Cover Bolt 10 N-m (89 lbs.in.).

The valve lash adjustment procedure should be used after reconditioning a valve seat when a new adjustable rocker arm stud has been installed. The fastener tightening specification for an adjustable rocker arm stud is 62 N-m (46 lbs.ft.).

Please note these changes in the appropriate Service Manuals.