Hi Brian,
Some info I have (admittedly from a supplier of bolts/gaskets)
differentiates between the old style head bolts as used on the 504 (eg
torque to x , then to y ) which are tight but not stretched when
installed, and so okay to reuse, and the newer style bolts which are
tightened to yield point, (eg torque to x , then tighten another 90°
etc). Since the newer style bolts yield as they are tightened, they
should not be retorqued, neither should they be reused.
I have no idea what the N9T uses, but someone should have the tightening
sequence that should indicated which style they are.
Also, the older style tend to be a plain shank on the bolt, while the
newer style have a thinner part in the shank
Kevin
Brian Holm wrote:
>You may know something that I don't, but I have sold a lot of heads and
>head gaskets, but have never been asked for a head bolt for an N9T. I can
>only remember one or two blown head gaskets on gas turbos where the head
>wasn't cracked. If the bolts were stretching I would expect to see more
>bad head gaskets.
>
> Peugeot does not recommend replacing the bolts, but they are still
>available @$23 each if you want to go that route. Gasket manufacturers
>love to recommend new bolts
>
>Gas turbo heads do not crack between the valves (diesels do) -- they crack
>from the exhaust valve across the gasket face of the head to the water
>jacket on one or both center cylinders. I have seen several really badly
>welded turbo heads, which failed soon. I hope that's not the case with yours.
>
>Brian Holm
>
>
>
>
>
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Received on Tue Aug 16 15:40:52 2005
