Removing engine stud

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Andre - 19 Jan 2008 18:12 GMT

I got the head of my '83 944. One of the studs that hold the head onto the
block is badly corroded. Looks like the spacing a rounded it is filled with
carbon build up. I was thinking about replacing it. What's the best way to
remove these? Are they reversed threads? Or should I just try cleaning
it (sanding it down) the best I can?

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thanks,
Andre

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William Noble - 20 Jan 2008 08:48 GMT

what do you mean "badly corroded"? I'd start by cleaning it off - if the
corrosion only penetrates a little (.010 or so), then I'd ignore it - if it
goes 1/2 way through, I'd replace it - I don't believe it is reverse
threads, but I haven't personally removed one - and I've only pulled about 6
heads, never seen a corrosion issue -

If you really need to change it, first, get a replacement - it would be even
worse to get it out and discover you can't get a replacement. there is a
special tool called a "stud remover" that you can put on a 1/2 inch breaker
bar to remove studs - but it will chew up the stud and you won't be able to
reuse it.

I wouldn't sand it down, I would use a scotch brite pad and get the
corrosion off, and then look at it and see what is really going on - and try
and figure out why it happened.

>I got the head of my '83 944. One of the studs that hold the head onto the
>block is badly corroded. Looks like the spacing a rounded it is filled
>with carbon build up. I was thinking about replacing it. What's the best
>way to remove these? Are they reversed threads? Or should I just try
>cleaning it (sanding it down) the best I can?

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Andre - 20 Jan 2008 22:30 GMT

I think I agree with you. I'll just clean if off as good as I can. Sure
took a little work getting the head off. I think the gasket leaked around
the stud causing something to seep into the space around the stud. I'm
guessing the spacing around the stud is for oil to move between.

I did find the parts at www.pelicanparts.com for $10 each. But I don't want
to take the chance on braking it off in the block since it's not a moving
parts, just to hold the head in place. I'll just clean it up and save me
some extra work.

BTW: any suggestions in installing the head and cam gasket? I got new once
but do I apply any sealing or something before installing?

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thanks,
Andre

> what do you mean "badly corroded"? I'd start by cleaning it off - if the
> corrosion only penetrates a little (.010 or so), then I'd ignore it - if
[quoted text clipped - 17 lines]
>>the best way to remove these? Are they reversed threads? Or should I
>>just try cleaning it (sanding it down) the best I can?

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William Noble - 21 Jan 2008 03:23 GMT

see if you can get a PDF or scan of the Porsche manual - it will be very
helpful to you

there is no selant on the head gasket - don't remember for sure about the
valve cover gasket - but it is ABSOLUTELY CRITICAL that you torque the bolts
in the right sequence, and in the exact way it tells you to.

While you have it apart, I stronlgy suggest that you change the cam seal,
and the front main seal, and the two balance shaft seals.

>I think I agree with you. I'll just clean if off as good as I can. Sure
>took a little work getting the head off. I think the gasket leaked around
[quoted text clipped - 8 lines]
> BTW: any suggestions in installing the head and cam gasket? I got new
> once but do I apply any sealing or something before installing?

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