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87 944S valve cover gasket leak

I just replaced the valve/cam tower gasket on my S, and it looks like there is still a slight leak that goes down the middle of the exhaust manifold header. Other than replacing the gasket again, what can I do to stop the leak? any input appreciated.
Old 01-11-2007, 05:34 AM
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can you see where exactly it is leaking??
the exact spot ?

does it leak while running? a proper dripping or is it more like oil "sweating" around that general area?
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Old 01-11-2007, 05:44 AM
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Quote:
Originally posted by svandamme
can you see where exactly it is leaking??
the exact spot ?

does it leak while running? a proper dripping or is it more like oil "sweating" around that general area?
it looks like it drips while it's running, like it's slowly seaping through the gasket then kinda flows down toward the middle of exhaust mani
Old 01-11-2007, 06:24 AM
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That's a really bad gasket to leak because fixing it is such a pain. I tend to use a sealer on a gasket that is that hard to fix. I have read where many here suggest using Hylomar or Loctite 518 as a sealant. With it already on, the only thing I know to do is to find the leak and try and retorque the bolts first. If that doesn't work, then unfortunately you will probably have to pull the cam tower off and reseal with a sealant.
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1990 944S2 Cabriolet
2002 Chevy Silverado 2500HD
2003 Maroon Ford F350 dually
Old 01-11-2007, 06:27 AM
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black sillicone gasket maker on both sides of the gasket...
it can't hurt to try, and it wouldn't be noticable cosmetically

Pelicanparts sells it , great stuff

and if it doesn't work out, you can easely pull it off again...

http://www.pelicanparts.com/cgi-bin/ksearch/PEL_search.cgi?command=show_part_page&please_wait=N&make=POR&model=911E&section=ENGreb&page=4&bookmark=16&part_number=37460-M258





did you check the valve cover and it's mating survace on the cam tower??
any scratches or damage?


also , how did you torque up your valve cover?
by hand or by the book?
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Last edited by svandamme; 01-11-2007 at 06:39 AM..
Old 01-11-2007, 06:28 AM
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I torqued it to 10 nm
Old 01-11-2007, 07:13 AM
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should be fine i guess.... this is what the book says for 968 ( couldn't find it for 944S, old pdf , not searchable )

25. Put the rags back in the spark plug recesses before refitting the cover. Check thoroughly to ensure no tools, parts, etc. have fallen into the engine.
26. Before refitting the cover, lightly lubricate the main cover seal with clean engine oil and make sure it is properly seated in the channel in the cover. Take care to ensure that it does not fall out when the cover is installed. Also make sure that the four circular black rubber sealing rings for the spark plug recesses are in their correct position on the engine (see figure 2). When the cover is seated properly on the engine, remove the rags from the spark plug recesses and check to ensure that the black sealing rings are visibly in place at the mating point halfway down each recess.
27. Check with the inspection mirror that the main cover seal appears correctly seated all round the cover.
28. Tighten the cover screws progressively. Do not overtighten! The correct torque figure is 10Nm/7ft.lbs.
29. Complete remaining assembly steps.

968 valve cover is pretty much the same as the 944S or S2 cover..
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Old 01-11-2007, 07:31 AM
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Quote:
Originally posted by svandamme
should be fine i guess.... this is what the book says for 968 ( couldn't find it for 944S, old pdf , not searchable )

25. Put the rags back in the spark plug recesses before refitting the cover. Check thoroughly to ensure no tools, parts, etc. have fallen into the engine.
26. Before refitting the cover, lightly lubricate the main cover seal with clean engine oil and make sure it is properly seated in the channel in the cover. Take care to ensure that it does not fall out when the cover is installed. Also make sure that the four circular black rubber sealing rings for the spark plug recesses are in their correct position on the engine (see figure 2). When the cover is seated properly on the engine, remove the rags from the spark plug recesses and check to ensure that the black sealing rings are visibly in place at the mating point halfway down each recess.
27. Check with the inspection mirror that the main cover seal appears correctly seated all round the cover.
28. Tighten the cover screws progressively. Do not overtighten! The correct torque figure is 10Nm/7ft.lbs.
29. Complete remaining assembly steps.

968 valve cover is pretty much the same as the 944S or S2 cover..
Thanks, if you can, can you send me the whole procedure?
Old 01-11-2007, 07:43 AM
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bit pointless, the procedure is about checking the Variocam tensioner...which isn't on a 944S...i just copy pasted the part about closing the lid...
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Old 01-11-2007, 07:45 AM
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gotcha, thanks again.
Old 01-11-2007, 08:43 AM
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That seems like an odd place to leak to me. The corners where it breaks up off the plane of the head should be sealed for sure. But yeah, I'd pull it apart, inspect it and seal it up with RTV. When using silicone under the hood, let it cure 24hrs before starting the car or you risk fouling the the O2 sensor.

Also, the bolt seals (grommets) can leak - maybe that's it?
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Old 01-11-2007, 04:15 PM
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gtroth, I've never heard that about the silcone fouling the oxygen sensor. Can you explain why it does that? Thanks
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1990 944S2 Cabriolet
2002 Chevy Silverado 2500HD
2003 Maroon Ford F350 dually
Old 01-11-2007, 06:33 PM
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I can't really tell you too much more about that, I'm afraid. As I understand it from what I've read here and on Rennlist, silicone products outgas something when they cure that if sucked in the intake will foul the O2 sensor. Some sealents are marked "sensor safe" which I guess means silicone free.
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Old 01-12-2007, 04:50 PM
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