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Crankshaft Housing Bore

pjq

By pjq
in 986 Series (Boxster, Boxster S)

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pjq Member

pjq

Posted
Posted

2004 boxster s 3.2l

what is crankshaft housing bore and tolerance?

What is crankshaft main journal specs and tolerance?

I finally got onto the Porsche Tech info website today. I can find torque values but nothing on the original sizing.

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Not sure I have ever seen that published anywhere as there are no oversized bearings for these engines. Usually, after such a failure, the crank and carrier are replaced. Might want to drop Jake Raby an email on this one.

pjq Member

pjq

Posted
  • Author
Posted

I turned a bearing. The rest of the crankshaft and housing looks good its just to check measurements. The case doesn't show any signs of heating but one main journal bearing is questionable.

logray Member

logray

Posted
Posted (edited)

I would not email Jake, I have seen him say he will sell these specs, but I have a feeling now he might not even do that because he is very close to publishing his engine M96 bible, which may have those specs included?

Anyhow, in the mean time you can get some of those specs here, starting on page 19...

http://www.renntech.org/forums/files/file/1657-after-sales-training-911-carrera-boxster-cayman-engine-repairpdf/

It doesn't list tolerances but I would go to a good machine shop. Any good shop should be able to check one journal and bore against the next and compare.

Or I guess another way to put it, what are their measurements? Any one measurement totally different from the rest/etc.

Edited by logray
pjq Member

pjq

Posted
  • Author
Posted

Thanks,

That was the back up plan but we were hopping for actual specs and tolerances to start from.

Pat.

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