Dilivar minimum
 

I broke three head studs on a 1980 sc with 85,000 miles or so. I got the motor out and wonder if i can pull the cam, towers and heads as a pair of units so i can just get the studs done and be back driving. I figure i will get a peek at the heads valves and cylinders and can change plans. Had the head nuts not hit me in the face when pulling the covers off for valve adjustment i certainly wouldnt be doing a top end rebuild. So how bad or ok an idea is it?
Thanks. I post over in the 914world, but you guys are the people to be asking eh?

You can pull the heads, cam carrier, rockers etc as a unit. Broken studs, you ll have to pull the cylinders to get to the broken stubs too.
Looking at the valves with 85k, spend the bucks and do a valve job. You lol need all 12 guides.
Top end gasket set, too.
Bruce

I had the same idea, hope yours works out better than mine. 7 broken head studs found, got 23 of 24. I'll be splitting the case today so I can send 1 half out to a pro, after 3 attempts the last stud is now flush with the cylinder mateing surface and I'm done trying.

While your in there might as well do a full refresh.

I think a lot depends on what shape the motor was in and how long you plan on keeping the car. Was it using oil or smoking? Do you care if you will be re-pulling the motor in a few years?

I would at a minimum check all the valve guides and pull a rod to see what the bearings look like.

I have also been told that some of the SCs had valve springs that are prone to break.

Thanks. There are stories of these engines running twice as long as mine without trouble. But i was in fact kind of expecting to get in farther and farther. I always do. On the other hand i often make things that will never be seen or wear become perfect because, well while i have it apart..

I thought i would make an attempt at self control this time.

Let me tell you, having a friend available to apply heat while you turn the broken stud is worth its weight in gold! I had two break on my 3.2 and my brother came home to help. For the non broken ones I'd strongly recommend the collar tool from Snap On. It threads onto the stud then you lock it down and can back them out with an impact. We used light heat for some and impact while others simply required a quick shot of Kroil and they came right out. Another thing, get the clip installation tool for the pistons if you can swing it. I was lucky, my brother had all these tools from his rebuild. And most importantly, if you run a forming tap to chase your threads DON'T BREAK IT OFF in the block. Use plenty of oil and patience and you'll be fine.

Of course i would be sure not to break off a tap in...wait, i have done that sort of thing. My condolences and thanks for the advice . Engine is out of the car!

If all your old studs are removed, it's a great time to up-grade to Supertec head studs.
They are available from our host and a very reasonable price. Considering the enhanced cylinder to head stability offered by this product, the peace of mind may be worth twice the price.

1984 Porsche 911 Carrera Coupe - Cylinder Head & Valvetrain - Page 5

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