Engine - Revised Fastener Tightening Specifications

9217buick02

Bulletin: 92-6-3

Date: Jan. '92

Ref. No.: 92-133-6A

Corp. Ref. No.: 136123


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

MODELS AFFECTED:
1990-92 REGALS


The following changes should be made to your copies of the following Service Manuals:

Year Section Page

1990 6A5 6A5-49
1991 6A5 6A5-59
1992 6A5 6A5-58

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

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

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

Cylinder Head Bolt Figure 28
Front Cover Bolt Figure 24
Intake Manifold Bolt Figure 16

In the 1992 Regal 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.