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Old 11-25-2003, 01:44 PM   #1 (permalink)
Carl Rose
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Default Hi everyone, On vacation t

Hi everyone,

On vacation this week so working on the car (328). Have problem with oil leaking down oil sump nuts (think it's coming past the threads) - what's the best way to fix this? Options as I see are:

1. Drain oil, remove nuts, put a dab of clear silicone underneath then retighten.
2. Drain oil, drop pan & replace gasket with some varaition of #1.
3. Drain oil, double-nut then back studs out and put sealant (type?) directly on threads then reinstall.

Open to all advice.

Carl
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Old 11-25-2003, 03:22 PM   #2 (permalink)
JRV
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Default Hi Carl, you could try self

Hi Carl,

you could try self-sealing nuts first. They have a sealing ring built in just for problems like leaking threads.

http://www.fastener-express.com/store.asp

http://www.amecorporation.com/fasten.htm

http://www.selfsealingfasteners.com/selfsealingnuts.htm

Regards, JRV
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Old 11-25-2003, 06:00 PM   #3 (permalink)
Carl Rose
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Default Thanks JRV. I did check throug

Thanks JRV. I did check through the references section; problem is I am for some reason stuck on this "looking OEM" (even though it's on the bottom of the car & only the garage floor can appreciate). Assuming I want to retain the original cad-plated nuts, what course would you reccomend?

Thanks again,
Carl
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Old 11-25-2003, 07:32 PM   #4 (permalink)
JRV
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Default Hi Carl, in the case you de

Hi Carl,

in the case you describe I think I would try simply installing small o-rings on the studs, then squash them into sealing mode with the original nuts.

The best of both worlds.

Regards, JRV
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Old 11-26-2003, 04:58 AM   #5 (permalink)
Carl Rose
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Default Taht, JRV, is an absolutely ex

Taht, JRV, is an absolutely excellent idea...that I didn't think of (retain my amateur status!)

Will try & report back results.

Thanks again,
Carl

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Old 11-26-2003, 06:08 AM   #6 (permalink)
Steve King
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Default I found that whenever I need t

I found that whenever I need to deal with nuts and oil I replace the orign. nuts with SS nyloc nuts. It does 2 things , seals the leak and acts as a lock washer. I don't have a "show " quality car even though it is super clean so I am not worried about "stock" appearance.
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Old 11-26-2003, 06:27 AM   #7 (permalink)
JRV
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Default Steve, seapage thru threds

Steve,

seapage thru threds is not a new problem. While nylocs 'may' stop some oil, that is not what they were designed for. If you will follow the above links, one or more of the sites gives good design parameters. One good example of nylock nuts not sealing would be early 911/930 lower valve covers. In order to actually stop the oil migration down the threads, captured o-ring washers are installed under the nylock nuts. This is due to the fact that nylocks alone would not stop the weaping. Most of these solutions have trickled down to cars from other Industries, such as Aero-Space and Racing.

Regards, JRV
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Old 12-09-2003, 10:18 AM   #8 (permalink)
Carl Rose
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Default Hi JRV, Just wanted to pos

Hi JRV,

Just wanted to post some follow-up. Two weeks now & no further leaks from studs. I used o-ring #47 11/32 x 7/32 (as I recall, can dig out package if anyone needs specifics) $0.29/ea from local hardware store. Invisible once installed. Excellent suggestion.
Carl
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Old 12-09-2003, 06:48 PM   #9 (permalink)
Carl Rose
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Default I'm home now full specs:

I'm home now full specs:

Danco 11/32x7/32x1/16 #47 O-ring
Carl
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Old 12-10-2003, 07:34 AM   #10 (permalink)
JRV
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Default Hi Carl, thanks for the upd

Hi Carl,

thanks for the update. Glad the fix worked out!

Yes Feedback is very helpful so we all know how things go for future reference.

Regards, JRV
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