Resorts & Lodging
Fishing Guides
Bait & Tackle Shops
Products & Services
Important Links
Classified Ads
Contact Us & More
Minnesota Fishing Reports






Crack in lower unit
LSF Member
Joined:
01/06/2016
From Plato, MN
Posts: 58
Hey guys, I have a hairline crack about an inch long in my lower unit (see pic). The previous owner smeared some silicone over it. I'm not familiar with the inner workings of a lower unit, is a crack in this location a big deal if some water gets in? Like will it contaminate my oil? I could weld it but I'd rather not disassemble it if I don't have to. Thanks for the advice!

Attach file:



jpg  IMG_20200420_192321.jpg (1,880.88 KB)
34522_5e9e409e95179.jpg 3006X4466 px

Posted on: 4/20 19:40:46
Transfer the post to other applications Transfer


Re: Crack in lower unit
LSF Member
Joined:
12/14/2014
From Duluth
Posts: 377
Good product,,,

Attach file:



jpeg  F414DA39-6D6E-4C6D-8484-75446AE5FAB0.jpeg (2,188.47 KB)
32461_5e9e4270214af.jpeg 3264X2448 px

Posted on: 4/20 19:46:53
Transfer the post to other applications Transfer


Re: Crack in lower unit
LSF Member
Joined:
12/04/2008
From Detroit Lakes
Posts: 1689
If you have a lower unit oil hand pump you could leave the top oil level plug in, screw the pump end into the drain plug hole and pump oil until you feel it pressurize. You will know if its an issue by a hissing, bubbling, or immediate pressure release on the hand pump. If it is cracked you could check with Tim's outboards in Hackensack, he may have a used lower unit replacement. Last one I bought for a similar vintage johnson was about $165-$180 IIRC but that was probably over 10yrs ago.

Posted on: 4/20 20:46:24
_________________
One Word - HUMMINBIRD
@rdshuntclub
Transfer the post to other applications Transfer


Re: Crack in lower unit
LSF Member
Joined:
01/06/2016
From Plato, MN
Posts: 58
Thanks yeah I thought about using something like that, my only hesitation with that is if I decide to weld it in the future when it needs an impeller or seal replacement and I have it apart getting that stuff off is a PITA. That's why I was curious if a crack in that location really matters? It's a 78 Johnson 25 btw, been a great motor!

Posted on: 4/20 20:53:51
Transfer the post to other applications Transfer


Re: Crack in lower unit
LSF Member
Joined:
01/07/2011
Posts: 225
Water in the lower unit oil is not good. JB weld or actually welding that would be a low cost option but could ultimately cause failure if it doesn't work. Replacing with a used one if you could get your hands on one would be more ideal.

Failure wouldn't be an issue on a local lake, but if your on a secluded lake in bad weather a motor breakdown could be catastrophic.

Posted on: 4/21 13:43:53
Transfer the post to other applications Transfer


Re: Crack in lower unit
LSF Member
Joined:
01/09/2008
From Mn
Posts: 3169
that crack is in the water jacket,only thing it may have caused a problem with is the water pump housing .its not near the lower oil case. run it and make sure its pumping water out the telltail/peehole. i have a rebuilt lower forsale if needed.actually its a whole 1975 25 johnson that i redid the whole ignition system and lower unit. how the heck did it get hit there? on a boat the transom protects that area of the motor?

Posted on: 4/22 10:10:25
_________________
Of all the things I've ever done,
I aint never had Too much fun.
Transfer the post to other applications Transfer


Re: Crack in lower unit
LSF Member
Joined:
01/06/2016
From Plato, MN
Posts: 58
Thanks, it pumps water very well so I don't anticipate it affected the impeller/housing at all. I'm not sure how it happened, it was like this when I got it. The oil has been staying very clean in the gear case. This entire motor was redone and I'm not sure why they didn't fix this when they did the rest of it. I have a couple of bigger trips planned for this boat to Vermilion and Kabetogama this summer so I just wanted to get some opinions on this crack. I'm a welder by trade so if I have to welding it up properly won't be an issue, just seems like a good winter project if it can wait...

Posted on: 4/22 12:28:27
Transfer the post to other applications Transfer







[Advanced Search]


 

 
Copyright 2004-2013 Lake State Fishing P.O. Box 577 Deerwood, MN 56444 612-414-5593
All logos and trademarks are property of their respective owners. |  Lake State Fishing |   Login lakestatefishing.com Facebook Page lakestatefishing.com Twitter Page lakestatefishing.com LinkedIn Page lakestatefishing.com YouTube Page