911 Carrera 4 Coupe AWD F6-3600cc 3.6L SOHC (1989)
Cylinder Head Bolts: Technical Service Bulletins
Cylinder Head Studs - Installation Precautions
Group
1
Number
9604
Model
911
Part Identifier
1012
November 7, 1996
Subject:
Crankcase Cylinder Studs
ATTENTION:
Service Manager / Service Technician
Models Affected:
All 911 models using Dilavar cylinder head studs.
General Information:
The Dilavar cylinder head stud, part number 930 101 170 02, has been superseded to cylinder head stud, part number 993 101 170 51.
Repair Information:
The following precautions should be followed when using the new version cylinder head stud:
1.
The new version cylinder head stud is micro-encapsulated with a stud locking compound, therefore, when installing the stud into the engine case,
the threaded portion of the case must be clean of debris and oil free. If necessary, chase the threaded hole for the cylinder head stud with a tap.
2.
There is no change in torque specifications for the cylinder heads and no change in the cylinder head nut.
3.
The new cylinder head stud can be used for individual replacement. It is not necessary to replace the cylinder head stud in groups.
Installation:
Model and Year
Installation Height
911 Carrera (993)
130.2 mm -.5 mm
911 Carrera 2/4 (964)
130.2 mm -.5 mm
911 Carrera up to 1989
135 mm
Parts Information:
New Version
Former Version (Dilavar)
993 101 170 51
930 101 170 02 (not available)