Please note this thread has been inactive for 90 days. For the best results, please start a new thread.
Results 1 to 5 of 5
  1. #1
    Lieutenant Junior Grade
    Join Date
    Dec 2007
    Location
    Alta Loma, California
    Posts
    1,091

    Default How to take apart the lower?

    I picked up a 7.5hp merc, with a stuck drive shaft.

    the drive shaft is pretty rusted, and wont move one bit, forward, back, up down, or rotate. Ideas on what to do?

    The shift mechanism works fine, engages gears, and nuteral, and prop spins properly, I doubt there is a ground down/broken gear inside.








    I just don't know what to do from here. pipe wrench on the shaft and force it to turn?

    Why fix the thing and not ebay the parts? Exactly 100psi in each cylinder.

  2. #2
    Chief Petty Officer
    Join Date
    Sep 2007
    Location
    Lancaster, NY
    Posts
    417

    Default Re: How to take apart the lower?

    Soak it for a couple of days with PB blaster, then a little heat from a propane torch might break it loose. Be careful though.

  3. #3
    Honorary Moderator Emeritus tashasdaddy's Avatar
    Join Date
    Nov 2005
    Location
    Jacksonville, Florida
    Posts
    51,017

    Default Re: How to take apart the lower?

    it is a merc, belongs in merc. not much similar, other than you use the same tools.
    FLORIDA GATORS
    TEBOW Country



    Please, NO PM's (Private Messages) regarding boat/engine problems. they will not be answered.
    That is what these forums are for. Post your questions, in the appropriate Forum.

  4. #4
    Lieutenant Junior Grade
    Join Date
    Dec 2007
    Location
    Alta Loma, California
    Posts
    1,091

    Default Re: How to take apart the lower?


  5. #5
    Lieutenant Junior Grade
    Join Date
    Dec 2007
    Location
    Alta Loma, California
    Posts
    1,091

    Default Re: How to take apart the lower?

    Gave the pipe wrench trick a try:



    ...no luck

Similar Threads

  1. Filling the lower unit..The lower plug 850 Thunderbolt circa 1977
    By washingtonmerc in forum Mercury & Mariner Outboards
    Replies: 4
    Last Post: October 23rd, 2011, 12:15 AM
  2. Replies: 4
    Last Post: June 12th, 2008, 04:40 PM
  3. 225 merc promax leaking lower lower unit oil
    By scott_gillroy in forum Johnson & Evinrude Outboards
    Replies: 3
    Last Post: November 9th, 2004, 10:26 AM
  4. 225 merc promax leaking lower lower unit oil
    By scott_gillroy in forum Mercury & Mariner Outboards
    Replies: 3
    Last Post: November 9th, 2004, 10:26 AM
  5. Lower Unit Swap Merc. 850 using 65hp lower
    By fomoco-gnatsum in forum Mercury & Mariner Outboards
    Replies: 0
    Last Post: August 11th, 2003, 07:22 AM
  1. iboats Forum Directory - Over 100,000 forum posts organized by topic