Warning for listers planning turbo rebuild
quattro at isham-research.com
Thu Dec 20 15:34:13 EST 2001
> Lacking experience to feel the needed torque by hand I am scared to
> death to torque exhaust manifold nuts. Some of them spin too much. The
> spec from Bentley is 30 n/m. Is it right? What does "pulled stud"
> mean? A stud is forced out stripping thread on the way? What is the
> fix? Drill for larger thread?
30Nm is right. There are two fixes for pulled threads:
a) Helicoils. Used where the hole is not badly damaged.
b) Stepped studs. Used where the hole is very badly damaged, e.g., where some monkey lad has tried to drill out a broken stud with
the head still on the engine.
Both are stronger than the original studs.
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