Cylinder Head Stud - Removal Procedure When Broken
83porsche03Subject:
Dilavar Cylinder Head Stud
Part Identifier 1012
Applies To 911
911 Turbo
1978 and on
Group
10
Key Points
Removal Procedure for Broken Stud
C
Number
83-03
August 29, 1983
If a cylinder head stud is broken above the threads in the crankcase, the following should be applied:
Repair Procedure
- Grind broken stud flat.
- Center punch stud.
- Using a 1/4 in. (6.35 mm) carbide tip drill bit in a drill press, drill approximately 15 mm into the stud.
- Drive a No. 3 Snap-On screw extractor approximately 10 mm into the bore.
- Heat housing in oven or with a torch to approximately 200~C to loosen the grip of the loctite. It is very important to heat the crankcase properly.
- Turn out the broken stud.
- Re-tap threads in crankcase and install new Dilavar stud with Loctite 270, Part No. 928 101 921 00.