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Thread: 402 lower unit

  1. #1

    Default 402 lower unit

    I am starting to get stuff ready for a winter project. I want to make a short shaft Merc 700 (3 cylinder) by using a tower from a 1972 402 and a power head from a 1979 700, so my first question is will this work. The foot on the 402 Is damage so it will have to be replaced, will the 402 driveshaft fit in a 1973 Merc 650 (3 cyl.) lower unit? I Have checked part numbers and they are different.

  2. #2
    Join Date
    Sep 2010
    Posts
    20,297

    Default Re: 402 lower unit

    I thinks it will not work.-----Start by checking / comparing the gaskets between powerhead and exhaust housing on these 2 different motors.

  3. #3
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,927

    Default Re: 402 lower unit

    I have a 65 hp (three cylinder) long shaft LU for sale--only $100 and it's in good shape with a new impeller. The long and short shafts interchange, and so do the shifte shafts (that can be splined or squrare).

    Interested?

    Jeff

    PS: I'm in Maryland

  4. #4

    Default Re: 402 lower unit

    Quote Originally Posted by fastjeff View Post
    I have a 65 hp (three cylinder) long shaft LU for sale--only $100 and it's in good shape with a new impeller. The long and short shafts interchange, and so do the shifte shafts (that can be splined or squrare).

    Interested?

    Jeff

    PS: I'm in Maryland
    Thanks Jeff
    I have a long shaft 650 thatís has a good lower unit and I would like to use the short drive shaft from the 402. So my question is will the short 402 driveshaft work in 650 lower unit. I think it should.
    Thanks Mike

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