Valve stem seats

Asked by Vaughn Mar 21, 2016 at 08:59 PM about the 1976 Porsche 911 Carrera 3.0

Question type: Maintenance & Repair

I have a 3.2 ltr engine  in my 911 and was going to
do the valve seats , do you need to remove the
heads or can you do them  in  place

3 Answers
7,540

Dzemo answered 8 years ago

no..just take out a spark plug put air nozzle make sure it doesn't lose pressure and/or suction..and replace..air will hold valve in place as long as there is pressure and solid flow of air to cylinder..

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Dzemo answered 8 years ago

sorry that was for valve stem seals..i don't know any other way..if you do it on car you might nick the head and make it worse.which would lead to leaking valves and eventually head replacement..

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Stephen answered 8 years ago

Tennisshoes is correct, the heads must come off. The seats seldom require replacing unless you've got 400k + miles on them. So more than likely you'll need a valve job.

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