Please note this thread has been inactive for 90 days. For the best results, please start a new thread.
Results 1 to 3 of 3
  1. #1
    Seaman
    Join Date
    Aug 2008
    Location
    New Orleans
    Posts
    71

    Question Lower Unit Oil Leaking From This Hole...

    My lower unit oil is seeping from this hole located on the port side of the lower unit. I've noticed gear oil seeping from this hole when the engine sits up for about 2 weeks or so. I also notice the lower unit slowly accumulates water in the oil and I suspect it is entering from this hole. I do not know what this hole is for, but it appears maybe a plug was fitted into it at one time? The motor is a 1975 25HP Evinrude. Thanks for any insight, it is always appreciated

  2. #2
    Captain
    Join Date
    May 2004
    Location
    Kent, UK
    Posts
    3,255

    Default Re: Lower Unit Oil Leaking From This Hole...

    The parts diagram gives no clue. Both the gearcase drain and level plugs are the other side I believe.
    It is probably to drain water from the leg.

    You should not get gear oil leaking from the unit at all. If you are sure you have gear oil leaking from there then you must have a seal gone. Most probably the drive shaft seal but possibly the shift rod seal. That would also explain the water ingress into the gearcase

    read the item on the Engine FAQs board on "Oil leaking around the lower unit"
    http://forums.iboats.com/engine-frequently-asked-questions-faq/oil-leaking-around-lower-unit-iwombat-207285.html

  3. #3
    Seaman
    Join Date
    Aug 2008
    Location
    New Orleans
    Posts
    71

    Default Re: Lower Unit Oil Leaking From This Hole...

    Thanks Vic for the quick reply. I've searched parts schematics, OMC service manual, and the forum and can't come up with anything. Recently, I changed every seal in the gearcase and also resealed it. I'm wondering if some sort of freeze plug went there from the casting process? I may have to stop at the boat junkyard and see what other units look like.

Similar Threads

  1. 150 hp, lower Unit Leaking gear oil out vent hole
    By 22trophy in forum Mercury & Mariner Outboards
    Replies: 5
    Last Post: December 21st, 2010, 11:22 AM
  2. 48 Special Lower Unit Weep hole leaking gear lube
    By 69starcraft in forum Johnson & Evinrude Outboards
    Replies: 3
    Last Post: June 17th, 2009, 03:05 PM
  3. 1990 120Hp force leaking lower end oil from small hole?
    By Netjunky in forum Force & Chrysler Outboards
    Replies: 6
    Last Post: May 11th, 2009, 08:52 PM
  4. johnson 150 lower unit exhaust leaking lower unit oil
    By jjdluz in forum Johnson & Evinrude Outboards
    Replies: 2
    Last Post: May 22nd, 2008, 05:56 AM
  5. lower end spedo hole leaking oil
    By admarchery in forum Mercury & Mariner Outboards
    Replies: 3
    Last Post: May 1st, 2008, 11:39 PM
  1. iboats Forum Directory - Over 100,000 forum posts organized by topic