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Thread: gearbox oil drain stripped thread

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    gearbox oil drain stripped thread

    Gday, undoing the gearbox oil drain plug brought half of the thread with it today.
    Has anyone had experience remedying this before?
    It seems to be a M30x1.5 thread... so at the moment I'm thinking of drilling and tapping it out to M32 which uses a 30.5mm drill size so should be just right.

    Surely I am not the first one to encounter this... has anyone done this fix before? Suggestions? Remembering the plastic oil filter still needs to be removable.

    I could tap M32x1.5 (metric fine) or M32 metric standard/coarse maybe coarser thread will be better for the aluminum?

    Then I need to source the drain plug style M32 fitting...

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    1f it’s an LT95, will it be metric?

    Why post the question in the Isuzu section? It’s a gearbox common to several model Land Rovers including Rover V8 petrol models.
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    REMLR 243

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    1971 Jaguar V12 E-Type Series 3 Roadster
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    Turns out the original plug is M30x1.5
    So I drilled the hole out to 30mm.
    And happily 30mm drill is the right size for a M32x1.5 tap!
    And M32x1.5 is common size for blanking off that size of conduit?
    I bought a tap and found a drain plug on amazon from some gearbox the US.

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    Quote Originally Posted by asmit View Post
    Turns out the original plug is M30x1.5
    So I drilled the hole out to 30mm.
    maybe m32x1.5 bolt can be found at your local bolt shop?
    Drill out the old thread with a 30mm drill bit and ideally a drill press, if it's out of the car...
    google m30x1.5 tap and buy a cheap one or a good used one on ebay.

    https://www.amazon.com/dp/B001SG8YL2

    m32x1.5.jpg

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