Wayne- Re-torqueing 930 Heads

[les_garten]

Hello,
I am coming up to the 600 mile mark on my rebuild on my '85 930. What is the correct procedure for re-torqueing the heads, and is it necessary? Do you back them all off a half a turn and re-torque, or just check the torque value without backing them off? I have ARP head studs and nutz.

Les
'85 930

[Wayne 962]

Did you use the anti-seize with them? If not, then any torque values will be suspect, as they will be a dry torque. Still, I would recommend torquing them up again. Don't back them up - just make sure that they are tight. Note - this is a highly debatable and subjective issue. When breaking in an engine, everything will tend to seat and set, possibly creating some looseness, especially on the magnesium motors. The last SC motor I rebuilt didn't need any turns after 1000 miles...

-Wayne

[les_garten]

I used ARP head studs and their moly type lube that comes with them.

[snowman]

THe only moters that require retorqueing, say so in the mfg recommendations. This is due to head gasket considerations, nothing else. With a Porsche, no retorque is required, as far as I know. Thats because of the solid head gasket design, ie a copper gasket. If you do retorque them nothing will be lost. I would NOT suggest loostening them first. Just check them if you must. These type of gaskets are usually ment for ONE time use, that is DO NOT loosten them.

[Wayne 962]

Jack, you will find on the mag cases that the heads typically will take a few turns of the head studs...

-Wayne

[les_garten]

Hello Guys,
Thanx for the feedback!

Les