Please note this thread has been inactive for 90 days. For the best results, please start a new thread.
Results 1 to 4 of 4
  1. #1

    Default Honda 50 Lower unit Cracked

    My Honda 50(1999) has a piece(clamshell shaped) of the gearcase missing fron the back edge of the case and runs forward about 3.5"s. It is and 90 degree arc at the back edge and runs out just forward of the bearing retainer rear section. The retainer nut is cracked just behind the prop. The moter runs fine at low speeds, but cavites at 5000. the propshaft part stack is tight axially and doesn't wobble.
    Any thoughts on why this happened and is it a common Honda problem?
    Thanks
    Lakeguy

  2. #2
    Lieutenant Junior Grade
    Join Date
    Jan 2003
    Location
    Southwest Florida
    Posts
    1,094

    Default Re: Honda 50 Lower unit Cracked

    pretty common on motors of that age...corrosion builds up between the bearing carrier retainer and the housing and forces the housing out further and further until it pops out a chunk...seen lots of 50's do it..seen it on Mercs,Mercruiser,rare on Yammies but happens

  3. #3
    Lieutenant Commander Mas's Avatar
    Join Date
    Oct 2006
    Posts
    1,620

    Default Re: Honda 50 Lower unit Cracked

    Don't know, but my in-laws 40 HP merc had a similar hunk missing from the cav plate. The motor was used only for a couple of weeks on a lake. There wasn't any indication of trauma...just a clean break.

    We couldn't figure it out, but we started stretching our ideas to some sort of "harmonic vibration" that found a weak spot in the alloy...you know, kinda like the wine glass shattering with sound. Probably not a chance as to the reason, but it made as much sense as anything else!

    MAS

  4. #4
    Lieutenant Commander
    Join Date
    Jun 2001
    Location
    blue lake ca usa
    Posts
    1,922

    Default Re: Honda 50 Lower unit Cracked

    Your description is a little vague but if I'm reading it properly ,that sounds like freeze damage.Is that concievable?

Similar Threads

  1. Lower unit removal 50 hp. Honda
    By scovex in forum Honda & Tohatsu/Nissan Outboards
    Replies: 2
    Last Post: July 25th, 2008, 04:14 AM
  2. Cracked head on honda 50 hp
    By dorcutt in forum Honda & Tohatsu/Nissan Outboards
    Replies: 5
    Last Post: January 26th, 2008, 03:22 AM
  3. Cracked lower unit
    By Muddlerman in forum Johnson & Evinrude Outboards
    Replies: 7
    Last Post: January 10th, 2007, 07:58 PM
  4. Honda BF 50 1997 LOWER UNIT OFF
    By kenwitt in forum Honda & Tohatsu/Nissan Outboards
    Replies: 1
    Last Post: June 29th, 2004, 10:32 PM
  5. Cracked Lower Unit
    By nofishjoe in forum Mercruiser I/O & Inboard Engines & Outdrives
    Replies: 2
    Last Post: July 13th, 2003, 07:37 PM
  1. iboats Forum Directory - Over 100,000 forum posts organized by topic