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Thread: Help needed,anyone know what size drain plug is on a 5.5 hp. Honda motor?

  1. #1
    Join Date
    Feb 2010
    Location
    Leeds County,Ontario,Canada
    Posts
    937

    Default Help needed,anyone know what size drain plug is on a 5.5 hp. Honda motor?

    Have an Airblo vacuum pump with a 5.5 hp. Honda gasoline engine I purchased from Leader,decided to change the engine oil,drain plug is in such a position that the oil drains all over the base,so decided to put an extension on to drain the oil off to the side. Guessed at the size,thought maybe 3/8”, plug looks to be about the size of a 3/8” bolt. Even tried it in my drill index,will thread through the 3/8” size,next size up 13/32” plug slips through. Anyway,ordered up a 3/8” street elbow and 6” nipple from local hardware store ( as can’t go in and verify size) , was way too big,looks more like almost 3/4”. Ordered 1/4” street elbow,nipple,seems as large as my index finger,still way too big. Says made in China,do they not measure the same as us? Would like to get an extension of some sort to be able to drain the engine without oil going all over the place.
    Thanks in advance for your help
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  2. #2
    Join Date
    Jan 2006
    Location
    Oneida NY
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    10,437

    Default

    Try a metric pipe thread, be gentle turning, don't force it. The threads are in aluminum which can be damaged easily.
    On my older Honda I extended the oil drain, I think it was a 1/4 pipe thread, (but that was about 10-12 yrs ago, and the engine was made in the U.S.
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  3. #3
    Join Date
    Feb 2017
    Location
    NY
    Posts
    54

    Default

    It’s probably a 1/4” npt, which is similar in size to a 3/8” fine thread bolt.


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