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Thanks to everyone who has provided assistance and guidance with my 2001 996 Cab project. 

 

The car did have a crack in the 1-3 cylinder head which was allowing oil and water to mix.  I sent the heads to Hoffman Machine in GA, they were fantastic, I highly recommend them (thanks for the suggestion). 

 

Heads are back and reassembly is going smoothly, but for one curious question. 

 

Above the chain slider on the 1-3 bank is a small metal baffle plate fastened with a short 10mm bolt inside the head. 

 

You can see it above the chain slider and cam chain in this pelican parts photo immediately to the left of the left most cam journal on the intake cam (see below).

 

My question is an odd one - is there no identical baffle to be installed on the 4-6 bank? I was quite careful storing all the bits that came off the engine and cannot find it. FWIW, the 996 parts fiche suggests that only one of these is installed in the car (heat shield 996 104 233 01). The Bentley manual suggests this part is only needed for  the left side (1-3 bank), but this seems somewhat illogical for a Porsche (and I have found errors in the Bentley manual elsewhere). 

 

Is it true that only one of these is needed?

 

 

 

pic05.jpg

 

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I rebuilt my 3.4 engine for the same reason,  cracked cylinder head. Also sent to Hoffman’s. Great work, still running strong with about 3,000 miles since rebuilt. Yes the baffle is only on one side. May have something to do with the direction of the chain movement.

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I am curious,  did you two guys by any chance get coolant in oil, but no oil in coolant?  Also where and how big was the crack/cracks?

 

Thanks

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  • 3 weeks later...

I run Evans NPG coolant, which operates as zero pressure when hot, so it was less likely to push coolant into the engine, but, given the location of the crack between between the plug holds and the freeze plug near cylinder number 3, it was more likely to push oil into the coolant. I did notice a small amount of mixed oil and coolant in the hose between the AOS and the top of the 4-6 bank and some 'sludge' but not a milkshake substance in the bottom of my sump.  

 

The crack was hairline, initially hard to spot until I was told where to look.   I can dig out a photo if helpful.

 

 

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