Oil drain plug gasket

Oil drain plug gasket

Postby ryguy [OP] » February 12th 2017, 12:14am

To start things off, I've had my 03 Astro for a bit over a year and it has always had a very minor oil leak coming out of the plug, something around 1 drip for a day of sitting in the driveway.

I changed my oil a few days ago and when I took the drain plug out the gasket crumbled a bit and was unusable. I got Dorman #66451 replacement as recommended by Dorman and the guy at Oriely's. After the oil change the normal drip seemed to be about 2 to 3X what it normally is and noticed the outer rim of the gasket is blown out, see photo with drip near bottom of drain plug. I tightened the drain plug via the snug plus a bit so it doesn't seem like I over tightened it.

Has anyone had good success with a drain plug gasket replacement? What style would you recommend? Or none at all?

For a bonus if anyone can identify other potential sources of oil/trans fluid/other liquid above the drain plug in the photo please feel free to comment. :ty:
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Re: Oil drain plug gasket

Postby Corsemoto » February 12th 2017, 12:25am

Oil pan gasket leak is common on these, dribbles down and drips of the drain plug.

If replacing leaking oil pan gasket, might as well replace timing cover/crank seal as well...
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Re: Oil drain plug gasket

Postby 97cargocrawler » February 12th 2017, 2:28am

Slap some aviation gasket sealant all over the plug threads and nylon washer surfaces before reinstalling. Red goopy stuff. Holds that oil in good.
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Re: Oil drain plug gasket

Postby chevymaher » February 12th 2017, 3:21am

What cargo said. I use a doreman help gasket. the metal ring with the rubber inside. I add I bead of ultra black gasket sealer to it before i put it in.

I can get mine to not leak if i screw with it without it. But it is so much easier just to use it and not worry about it. Takes 10 seconds to clean the old off when you pull the plug.

I actually just do it on everything now.
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Re: Oil drain plug gasket

Postby Lumpy » February 12th 2017, 3:30am

That's an odd looking oil pan...

They sell oversized plugs. Couple thousandths oversize to help seal threads that are buggered.


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Re: Oil drain plug gasket

Postby Corsemoto » February 12th 2017, 3:37am

If the gasket is showing, it wasn't seated correctly on the drain plug and/or possibly not the right drain plug/gasket combination.

I replaced the original drain plug with a Dorman 090091 flanged hex bolt with inset rubber gasket drain plug and it works fine, no leaks.
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Lump, later model oil pans are cast aluminum.
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Re: Oil drain plug gasket

Postby Ken2.7 » February 12th 2017, 4:22am

Mine has the same drip but only after sitting cold for a few days. When I'm driving it and park it I don't have a drip. Only after it's been sitting for a few days. I appreciate the advice and will use the aviation sealer on the plug threads. If that doesn't do it I may put a new pan gasket on.
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Re: Oil drain plug gasket

Postby Leeann_93 » February 12th 2017, 4:22am

I use the gasket with the metal ring outside, rubber inside, but not the Dorman/HELP! version. Um, can't think of the name, black packaging with yellow writing - Oil Tite or something?

I don't have to use any goop on mine as long as I change the gasket every time.
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Re: Oil drain plug gasket

Postby sixsix » February 12th 2017, 9:14pm

ryguy wrote: ... For a bonus if anyone can identify other potential sources of oil/trans fluid/other liquid above the drain plug in the photo please feel free to comment....

OK... I'll take that Challenge:

In my Opinion - It is leaking from something / somewhere "Above" the Oil Pan Drain Plug. Everything above ( and including ) the Plug ( of course ) is suspect.

OK... I won? .. did I Win? What could the Bonus be? I wonder. I Love Contests ... almost as much as...

"I enjoy long walks on the beach and quiet evenings in front of the fireplace. I'm a Gemini/Taurus cusp and I know the SAE-Metric equivalent wrench sizes from 1/8 to 3/4 inch."
( holy cow - that's funny )

And that Pan looks like something you can buy to Epoxy on for offroading and not punching a hole in it - I saw he has a AWD.



Mike

ps: Don't forget to Wipe off the outside of the Entire Oil Pan, then put a clean piece of Cardboard or Shipping Paper / Blank Newsprint Paper. Might Help in Location Determination ( 5 Syl. ).
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Re: Oil drain plug gasket

Postby Leeann_93 » February 12th 2017, 10:21pm

My guess would be more rear main seal leaking down or the oil pan gasket itself.
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Re: Oil drain plug gasket

Postby Lumpy » February 12th 2017, 11:04pm

I like those same washer/gaskets that Leeann describes. Copper or brass and rubber. But really, I've used about all the styles - solid copper, nylon etc. I can't recall any of them leaking. I think the solid copper style tend to fuse with the surface of the oil pan after being torqued in place and heated for a year between changes. Harder to remove and leaves a little mark. But it's probably that very property that allows them to fill tiny gaps and voids and do what it's supposed to do, seal the hole.

Strange engineering challenge, I would think. Seal a hole with a bolt. Don't torque it too tight or it will deform the threads and leak. Torque it too loose and it may back out or leak. Add to the problem the thing is heated to near 200 degrees on one side and cooled by airflow on the other side - expand and contract. Plus, of course, the inside of the threads are literally bathed in oil. Seems like a leak waiting to happen by basic design.


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Re: Oil drain plug gasket

Postby FrugalAstro » February 12th 2017, 11:32pm

This is the one I've used for years - works good for me and can reuse several times.

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Re: Oil drain plug gasket

Postby Ken2.7 » February 13th 2017, 1:24am

Where do get a plug gasket like that?
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Re: Oil drain plug gasket

Postby FrugalAstro » February 13th 2017, 1:36am

Ken2.7 wrote:Where do get a plug gasket like that?


They are the sealing washers for the suction / discharge manifold for GM A/C compressors. Most any auto parts store will have them and the links below are from Rock Auto:

https://www.rockauto.com/en/moreinfo.ph ... 49&jsn=749

https://www.rockauto.com/en/moreinfo.ph ... 48&jsn=748
Last edited by FrugalAstro on February 13th 2017, 1:38am, edited 1 time in total.
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Re: Oil drain plug gasket

Postby AstroWill » February 13th 2017, 1:37am

LAPS, Online, etc. Dorman 097-021 is one example.
http://www.dormanproducts.com/itemdetai ... me=097-021

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Re: Oil drain plug gasket

Postby markmitch » February 13th 2017, 2:25am

:rofl:
Always wondered why there is a single bolt not holding anything on the bottom of the engine? good thing I didn't just take it out and toss it huh?
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