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Old 10-09-2020, 06:14 AM   #1
billybronco1
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Default 36 Can't Stop The Oil Pan Drain Plug Drip

What gasket do you find is best on the oil pan drain plug? I have replaced the drain plug and can not stop the constant drip. I see Mac's has two types of washers, the crush type and the standard flat copper ones.
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Old 10-09-2020, 06:53 AM   #2
51 MERC-CT
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

Don't be afraid to use some non-hardening Permatex along with whatever washer you choose to use.
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Old 10-09-2020, 07:31 AM   #3
Kurt in NJ
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

On some modern cars washers with rubber insert are used, I have used those washers on other problem leak cars
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Old 10-09-2020, 08:17 AM   #4
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

At your next oil change, take a moment to determine whether the threads of the drain are damaged or whether the surface to which the washer seals is not smooth; either is easily corrected and should assist with a permanent fix. In the interim, +1 on the Permatex option.
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Old 10-09-2020, 08:22 AM   #5
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

Suspected partial cross-threading at some point in the car's long run of life
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Old 10-09-2020, 09:44 AM   #6
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

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Teflon tape is a popular hydraulic thread sealant here and I've used it on oil pan plugs before.
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Old 10-09-2020, 12:08 PM   #7
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

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Originally Posted by RalphG View Post
Teflon tape is a popular hydraulic thread sealant here and I've used it on oil pan plugs before.
I'm not too sure I would want to use Teflon tape on oil fittings, plugs, etc It's not inconceivable that pieces of that tape might get inside the oil pan, and get pulled into the oil flow system, causing some blockage in small passageways. I know it's a no no on gasoline/fuel supply lines.

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Originally Posted by billybronco1 View Post
What gasket do you find is best on the oil pan drain plug? I have replaced the drain plug and can not stop the constant drip. I see Mac's has two types of washers, the crush type and the standard flat copper ones.
I would do as suggest by someone else here, check for cross threading of plug & oil pan threads, look for other possible damage of plug and pan in the sealing areas, and find or make a copper gasket that will stay on the plug when it's removed from pan
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Old 10-09-2020, 12:43 PM   #8
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

My 36 marks it's territory under the drain plug as well. In my case it isn't the plug--the bung itself leaks from the seam where it is attached to the oil pan. It is on my project list to take the pan off some day and put some JB Weld on the inside, but it will be done tomorrow..........and we know tomorrow is never here!!
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Old 10-09-2020, 02:40 PM   #9
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

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Originally Posted by swedishsteel View Post
My 36 marks it's territory under the drain plug as well. In my case it isn't the plug--the bung itself leaks from the seam where it is attached to the oil pan. It is on my project list to take the pan off some day and put some JB Weld on the inside, but it will be done tomorrow..........and we know tomorrow is never here!!
I think after taking off that pan, if it was me, I'd get it brazed.

I'm not a big fan of JB Weld never had very good luck with that stuff.
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Old 10-09-2020, 04:14 PM   #10
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

Thanks guys, I will take a closer look next time and will use some Permatex. So no comments on what washer to use? Anything one is as good as the other?
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Old 10-09-2020, 06:53 PM   #11
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

Have you tried a plastic washer backed up with a steel one?
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Old 10-09-2020, 07:05 PM   #12
billybronco1
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

Have not tried a plastic washer.
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Old 10-09-2020, 07:06 PM   #13
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

have you thought the leak might come from the large cotter pin in rear of pan ?
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Old 10-09-2020, 07:13 PM   #14
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

I use a large rubber O ring. Works great
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Old 10-09-2020, 07:13 PM   #15
billybronco1
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

I have read about the cotter pin, have not investigated yet, need to really study under there next time my body feels like crawling under.
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Old 10-09-2020, 07:17 PM   #16
billybronco1
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

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I use a large rubber O ring. Works great
Interesting idea, I suppose you need to be real careful not to over tighten the plug. Do use any other washer with the o-ring or just the o-ring? I have plenty of those.
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Old 10-09-2020, 08:39 PM   #17
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

I am not a fan of using an O ring in a joint that is not designed for it. I would use a copper or aluminum washer and replace it every oil change.
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Old 10-10-2020, 12:46 AM   #18
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

pipe tape was suggested by someone i to don't like tape for same reasons however i do use the liquid Teflon paste Wipe some on the thread small bead on the washer tighten and wipe off excess works a treat
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Old 10-10-2020, 05:55 AM   #19
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

Have your machinist buddy turn out a thin aluminum washer for you or use my favorite thread sealer: Blue Monster, great stuff on anything but wash the area with alcohol first.
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Old 10-10-2020, 08:27 AM   #20
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Default Re: 36 Can't Stop The Oil Pan Drain Plug Drip

A little Loctite 518 on between the washer and the pan will stop the leak and it’ll still be easy to remove.
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