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Thread: Dry sump oil tank plug

  1. #1
    Join Date
    Apr 2013
    Posts
    33

    Default Dry sump oil tank plug

    My dry sump oil tank has one fitting in the lower half than needs to be plugged in my application (1700 BDR). What was in there was a large, headless, hex-drive plug, like a giant set-screw. The flange on the tank and the plug/screw each have a cross-hole, through which a cotter-pin is inserted, to keep the plug from moving. Problem is that this is a leak path for oil. Pictures (I don't know why the forum turns my pictures 90 degrees):



    The fit of the threads is very loose. I know I could just wrap a bunch of pipe thread tape around the plug and put it in, or use pipe thread sealant from a tube. But neither of these seems like the right way to seal this hole. Seems like I'd want a bolt with a head on it, i.e. an oil drain plug, so I can torque it down, which would snug the threads up and help the tape or sealant to seal.

    As best I can measure and guesstimate, the threads on the plug are M20-1.5. When I search that I do find oil pan drain plugs that have that thread size. They're not anodized aluminum as this plug is. Steel bolt in aluminum tank might corrode.

    Thoughts on the right way to seal this hole? Am I over-thinking this?
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  2. #2
    Join Date
    Dec 2014
    Location
    Los Angeles
    Posts
    169

    Default

    Try batinc.net. They show a plug in that thread with an o-ring seal. Probably just what you need. If you are nervous about the fit, you could drill one corner and safety wire it.

  3. #3
    Join Date
    Oct 2006
    Location
    South Lyon Michigan
    Posts
    197

    Default

    I would guess that all your fittings are on the tank are JIC i.e. AN, and that you need a 7/8-14 drain plug. A metric 20mm thread actually has a pitch of 2.5.
    I would 2nd the use of a drain plug with an o-ring or sealing washer.
    DaveW

  4. #4
    Join Date
    Apr 2013
    Posts
    33

    Default

    Thanks guys.

    This page:

    http://50.62.235.225/files/drysump.pdf

    though not the same brand of tank, lists thread size of M22-1.5, which is about what I come up with when I measure with my caliper. Definitely a finer thread than 2.5 pitch.

    This page:

    http://50.62.235.225/files/caplug.pdf

    Has a couple plugs that might work. I'll see if I can order them somewhere.

  5. #5
    Join Date
    Sep 2005
    Location
    St. Louis, MO
    Posts
    428

    Default

    Maybe contact Stewart and find out where he got the tank? Then you can be sure what size fitting to get, and eliminate the guess work.

    I have a number of "spare" fittings from trying to guess the correct size.

    Steve

  6. #6
    Join Date
    Mar 2010
    Location
    San Diego, CA
    Posts
    120

    Default

    I’ve been in touch and am slightly embarrassed to have sold a set of oil leaks (with a free Caterham thrown in for good measure), but this one at least should be straightforward to fix. My only worry with PTFE tape is that fragments might end up in the oil, but applied carefully should be fine. The original tank came from Dave Bean.

  7. #7
    Join Date
    Apr 2013
    Posts
    33

    Default

    Stewart you've been great - very helpful. This was the biggest leak point, and likely the easiest to fix. I'm getting to know the car better through this work so no worries. The other leaks - around the pump, and front left engine, seem slower, so I'll likely live with those into next season and try to figure them out over time. The pump might be the adjusting screw, and I did buy a sealing washer to go on that, so we'll see if that helps. And the front left engine is likely the hoses that you had mentioned to me. Those look tough to get at. Wondering if other folks have experience with that on a BDR?

  8. #8
    Join Date
    May 2010
    Location
    Chicago
    Posts
    104

    Default

    The Mocal site lists a Tank Adaptor 22mm Male x -AN Male. Just install that with a fiber washer and that get an AN cap fitting.

    https://www.amazon.com/Anodized-Alum...SIN=B00SI3NX2I

    Graham

  9. #9
    Join Date
    Oct 2006
    Location
    South Lyon Michigan
    Posts
    197

    Default

    Yupper we have metric threads!!! I do not understand that logic. 95% will use AN fittings on the tank, but we need a adaptors? DaveW

  10. #10
    Join Date
    Apr 2013
    Posts
    33

    Default

    I have finally confirmed the thread size: 1/2" NPT. So I think the best solution is along the lines of what fastg says above: 1/2" NPT male to 6 AN male adapter, washer between adapter and tank, and a 6 AN cap. Now to order, likely from Summit Racing.

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