Looneybin

I’m working on my 86 S3 project car doing the head gaskets, and noticed when I pulled the valve covers off, that it appears to have head studs and nuts, not head bolts.
could the PO retrofitted the motor with Studs? I didn’t even know that was an option
see picture and let me if I’m seeing it correctly
thanks
Brent

Looneybin

Just read Greg’s post about trashing the new head studs with the 3X90 method
so what is the latest consensus with reusing existing the studs?
new nuts and 3X90? , or 2X90?
thanks

JET951

Hi Brent , all the M28 /43/44 & M28 45/46 928S 5L quad cam 32v engines ( 1985 & 1986 ) had head studs with nuts , it was the next generation of the 5L 32v quad cam engines , the 928S4 ( 1987> ) that had head bolts
Regards
Bruce Buchanan
Buchanan Automotive

Mrmerlin

Before you take the nuts off mark the location of the nut and transfer the mark to the socket
then loosen it one turn set the torque wrench to 75 ft lbs an tighten the nut see where your line is increase the wrench torque till you return the nut to its original. Position
do a few nuts to find repeatable results

when you go to final assembly you can set your torque wrench to whatever you found and you will see how much you need to tighten the nuts as compared to the 90 degree system you will see you will be pretty close to the 20 nm then 90 90

I think hawing this info can prevent over tightening of the studs and damaging the block or studs

Looneybin

Thanks for the info
i tested 4 nuts and they were between 65 and 75 ft/#
if I do them all at 75ft/# would I be GTG, of should I do the 90x2 method
thanks

Mrmerlin

if you find repeatable results and you monitor how much your turning the nuts,
IE so your not going say 1 and a half turns instead of one turn
setting the TQ wrench at 75 or what ever amount you find would probably be safe to proceed.
NOTE I suggest this as secondary way to monitor the amount of torque being applied to the fastener.
And I have found it to be pretty accurate. or rather repeatable.

Looneybin

I think i'm understanding your idea
set the TQ at 75, then go 2x90 and see how close they are?

Mrmerlin

yes you should be pretty close