Quote:
Originally Posted by dtxscott
Doing a valve adjustment on my '89 Carrera 3.2L recently and noticed pitting on Cyl 2&3 exhaust side cam lobes.
I have the cam housings off the engine and am looking at options on the head studs. Thankfully all are intact but I don't want to re-assemble the engine without addressing the exhaust side head studs.
I plan to go with the 993 studs to keep things simple. This is a stock engine in a bone-stock car.
I also plan to address the exhaust-side valve guides as I get black soot on the back of the car and burn a little oil.
Question1: By pulling the heads, will I be disturbing the cylinder base gasket? YES
Question 2: Will I need to replace the cylinder base gasket? YES
Question 3: The Bentley manual indicates to snug the head nuts down by hand then torque the cam housing to the heads.... Then come back and torque the head nuts afterward. Is this the correct? YES
Thanks for any and all help!
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The process you are contemplating is pretty involved. Removing the heads, replacing the head studs all without disturbing the cylinder base gaskets.
They are copper and compress when the head/cylinder stack is torqued.
It may not leak but why risk it? Pull the cylinders, do your head stud replacement, install new gaskets (we use Curil T as a sealant) and enjoy the peace of mind.
As for cam tower assembly, you cam also assemble the heads and cam towers on the bench. Then drop them on the engine as an assembly. Either way works.
What ever method makes you more comfortable is fine.