Welcome Guest - Sign Up today
Welcome Guest - Sign Up today


No announcement yet.

Exchanging newer outdrive with older?

  • Filter
  • Time
  • Show
Clear All
new posts

  • Exchanging newer outdrive with older?

    1980 OMC 400 has been run with water and little oil in the outdrive.
    some bearings have seized in the outdrive upper section.
    Have access to an older outdrive from a 1969 unit. Will the ‘69 outdrive fit the ‘80 midsection?
    Question two, how common is the OMC 4 cylinder with twin carbs?

  • #2
    The 69 model drives only were produced in one length which is 4” taller than the 400 model. The upper gear housing internal gears and bearings are the same if the 69 model was used on a 120-155 hp model. The water pump and pinion shafts are also longer on the 69 model.
    And of course the 400 is a mechanical shift and the 69 is electric shift.
    The 120 twin carburetor Models were plentiful but had to be synchronized or they would not idle good. When they were running good they were the quietest and smoothest running packages. The last twin carburetor models were produced in 72 then the 2 barrel low profile models started in 73.
    Last edited by kenny nunez; July 30th, 2020, 06:43 PM.
    Kenner, Louisiana 1980 Donzi 18'. 2+3 6.2 MPI Alpha 1


    • #3
      Sign up today
      No....it wont fit.

      Your 78-80 hydro-mechanical drive can be changed with a 81-85 mechanical shift 400
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari