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What sealant to use for oil pressure sender?
Help!
My 964 C2 oil pressure sender is leaking. I am chaning the o-ring seal. In addition, what sealant should I use to prevent further leak? Locktite 574? Curil-T? Gasket maker? I am thinking of putting the sealant on the mating surface of the sender to the block. See pics.   thanks, anthony |
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04-05-2006, 10:13 PM
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Registered
Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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engine oil
check O-ring channel for burrs
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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04-05-2006, 10:28 PM
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Now in 993 land ...
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O ring dressing, i.e. DowCorning 111. Or as randy said, engine oil ...
Do NOT put any RTV or similar on there. That's shade tree procedure if you do not want to put a new o-ring.  It may also end up in your oil spray nozzles - not good. George |
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04-05-2006, 10:35 PM
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Registered
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Thanks.
I have Curil-T left over from my rebuild. Is that the same as DowCorning 111? |
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04-05-2006, 10:47 PM
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Now in 993 land ...
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No, it is not the same. Do not use it. The DowCorning is more of a "vaseline" to help install and keep the o-ring smooth. It is by all means not necessary, but it is nice to have around on an engine that has TONS of O-rings.
George |
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04-05-2006, 10:57 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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On pipe threads, I use Loctite PST. It's a paste-like teflon sealer as opposed to teflon tape which I don't recommend. Carroll Smith recommends this too.
Sherwood |
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04-06-2006, 12:04 AM
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Registered
Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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An O-ring should seal all by iteself - it is designed to do that. You can even run quite a bit of pressure differential. Also, people that measure the increase in O2 use for a small bird hopping or even an ant running on a treadmill use O-rings. The infiltration is that low...
I bet you can look up some nice diagrams on the web - wiki? - re how they work. Bottom line - if it doesn't seal with just a bit of lubricant on it, then something is wrong. So, use a new ring of the correct size, and check the bore and the channel. Do not use any sealant or goop etc.
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off Last edited by randywebb; 04-06-2006 at 02:06 PM.. |
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04-06-2006, 10:24 AM
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Now in 993 land ...
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What Randy said - minus the birds and ants thing.
 We had a long discussion about RTV on O-rings in the engine rebuild section before. Do a search, if you are looking for entertainment. George |
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04-06-2006, 01:25 PM
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Irrationally exuberant
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anthony,
If you have any RTV now would be a good time to gather it up. It's OK, we'll wait.... Now toss it in the trash. Sorta kidding, but seriously for Porsche motors it's the work of the Devil. The little RTV "boogers"/crumbs that it produces can block the very tiny (pin holes really) piston squirters and camshaft spray bars. -Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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04-06-2006, 04:48 PM
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Registered
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Thanks for the advice. I'll guess I'll just use the new Viton o-ring only.
We'll see how it goes this time. --- anthony |
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04-06-2006, 07:39 PM
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The Blue Pheonix
