Quote:
Originally Posted by Walt Fricke
I see no one has opined on that grooved passage in the case for which you posted a picture. My belief is that it is there to allow oil which might otherwise try to escape out of the case at the parting line to have an easier path to drain back into the case, where it won't cause trouble.
Were I more knowledgeable or diligent I could find a diagram which shows which of the case through bolt passages are also passages for oil under pressure. And it may be the only such passage which has the outer side of the case as the next place for oil to go if it leaks - most of the bearing saddles, should they leak (Porsche doesn't seal the bearing saddles other than at the ends of the case, but some engine builders do) they will do so into the engine. Leaks like that are so small they won't affect oil pressure.
My engine reassembly mentor cautioned me to be careful with the sealant (he, and thus I, use the orange 574, which you can put on very thin if you take the trouble to do so)around this area so as not to fill it with sealant.
But it may be this was Porsche anticipating a problem which never really is a problem?
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You are 100% correct. The other joints can leak into the case. This joint could leak outside the case so the channel provides a path to leak back into the case. It should be left clear of sealant.