Oil drain plug thread count

Discussion in '6.9L IH & 7.3L IDI Diesels' started by libsys, Jun 6, 2018.

  1. libsys

    libsys Registered User

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    Hello all. I changed my oil the other day and put a new washer on the pan plug, and now it's leaking. So I'm going to pull it and try another washer, but I want to be sure to have a bolt ready to put in temporarily so I don't lose all my new oil. So... the plug is 1/2" (right?), but I'm not sure about the thread count. Thanks!
     
  2. laserjock

    laserjock Almost there... Supporting Member

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    I am pretty sure it’s 1/2-20.
     
  3. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    If you're daring enough and have everything you need within arm's reach under the truck with you, you could try to pull the plug and just cover the hole with your finger. Then change out washers with your free hand and quickly install the drain plug again. It may be about as easy to drain the fresh oil into a clean container and then pour it back into the engine using a funnel. This would let you use both hands and eliminate the unavoidable (for me anyway) mess of trying to install something in the drain hole while oil is pouring out.
     
  4. chris142

    chris142 Full Access Member

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    1/2 x20
     
  5. Trevtron

    Trevtron Supporting Member Supporting Member

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    I’ve heard you may be able to open your oil fill cap and put a shop vac on it to create a vacuum to prevent oil from pouring out of the drain pan...seems like it would be best to recover the oil in a fresh containers stated earlier though.

    I still wonder if that shop vac trick works or not.... as I’ve been in your shoes before and pondered the same thing, how the hell do I remedy the leaky oil drain plug washer!?
     
  6. genscripter

    genscripter Full Access Member

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    My suspicion is the vacuum pressure won't do much, cuz the CDR will let all the vac escape. Also, the engine oil is really heavy and all that viscous pressure focusing down on the drain will outweigh anything a shop vac could produce.

    I'd say the finger technique is the way to go.
     
  7. Thatoneguy

    Thatoneguy Full Access Member

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    FUMOTO VALVE. Lol. Other than that I would say drain into clean container (empty oil containers that fresh oil came from?) And then dump back in. I know if I tried the finger thing, I would end up with oil everywhere.
     
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  8. saburai

    saburai Full Access Member

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    I've done it with a finger on multiple vehicles. Have everything within one arms reach or have a helper and stay frosty...
     
  9. 79jasper

    79jasper Chickenhawk

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    I've done it with the cooling system on my powerstroke.
    Did that to remove a block drain and install a valve.
    Works.
    Before knocking it and dispelling it, try it.

    Sent from my SM-G892A using Tapatalk
     
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  10. Trevtron

    Trevtron Supporting Member Supporting Member

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    Hell yeah
     
  11. oregon96psd

    oregon96psd Full Access Member

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    Your cooling system is a pressure system, completely sealed except for the fill cap, a crankcase is not. As said earlier the breather would totally screw you. It does work tho, I have a air powered vacuum transducer on my service truck for hydraulic, cooling and fuel system work.
     

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