Subject: Cylinder Head Studs Exhaust Side Models:911/930 1977 ->
Bulletin Number: 77-04
When cylinder head is removed during major engine repairs, include the following operation:
- Remove cylinder head mounting studs on exhaust side of crankcase (6 on each side).
- Install “Dilavar” studs (shiny), Part Number
930 101 170 02
Always replace studs on both banks of cylinders.
- Use Loctite Number 270 on end of stud that goes into crankcase
- Screw stud into crankcase until protruding length is 135mm (5 – 5/16 in.) (see fig below).
Part numbers for identification only. Always consult Parts Department for correct numbers.
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