DDK - Die Deutschen Klassiker

Has anyone experienced this?
I had all 24 studs timeserted on my. 1973 2.7RS replica.
The copper sealing ring is narrow on the 2.7 but now that the holes are expanded to take the timeserts the sealing surface becomes wafer thin.

It seems that one of the cylinders is now spilling oil onto everything below it including the exhaust which is a serious problem.

Just wondering what the solution to this is.

Many thanks

63sven wrote: ↑Wed Nov 02, 2022 2:42 pm Just wondering what the solution to this is.

Buy another 2.4 crankcase and don't enlarge the spigots.

Install the barrel base gasket using the Loctite sealant on the case side?
Keeps oil in the engine everywhere else, but of course a 1/2 engine tear down but you might as well do all the seals as another is bound to do the same.
Pointless trying to seal it from the outside, the oil will find a way through over time.

Major dissapointment but can't think of another solution sitting here.
New copper gaskets of course.

Best to check the torque of the head barrel nuts first!

Curil-T as a sealant on the copper gaskets

Thanks for the positive suggestions from Peter K and 911hillclimber. I will look into both of these.
As the timeserts are installed slightly down from the mating surface I was thinking about using chemical metal and a file to bring this back up and increase the mating surface. Hadn’t thought of adding a sealant as well but worth a try. Regards David

FYI. Not sure Curil-T (now replaced by Curil-T2) will be effective in that situation. It is designed to seal near perfect flanges. The max gap it is designed to fill is very small (0.2mm) and it doesn’t set. You also have to check the max temp of a sealer, in that use case.

I use high temp RTV under cylinders (type1/4)

Also use Loctite 518 for some sealing uses. It’s a liquid gasket & anaerobic.

Unlikely to be of use but if you tear it down, metal can be spray welded back on and the interface machined flat.

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Could it be that the end of one of the inserts has sprung slightly proud of the surface when the head was tightened? Wellseal is a good all round semi hardening sealer.

I don’t think that has happened as the torque on Porsche cylinder head nuts is so low. Admittedly magnesium alloy is about as tough as toffee but I don’t think that will be the case. On the 2.7 the copper sealing ring is narrow and even has indents for the head studs. Add in the loss of mating flange for the inserts and it looks like a problem waiting to happen.

Even though the leak is slow it is enough to coat the underside of the engine in oil and drip onto the exhaust once you park up.

This leads to a worrying amount of white smoke and so I know I have to take action.