Stuck lower unit on a 25hp evenrude

Fiberglass Supply Depot
Fish On Fabrications
TinBoats.net

Help Support TinBoats.net:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
K

Kevin Nicholls

New member
Joined
Jun 2, 2017
Messages
2
Reaction score
0
I picked up an 81' 25 hp Evenrude and I'm going to have to reseal the lower unit on it. Trouble is the previous owner didn't grease the stud and now it's my problem. It's very corroded and won't budge I've tried penetrating oil and I'm having no luck. Any great ideas from the experts? Thanks, Kevin
 
Heat, lube, tap it with hammer and repeat. That heat will drive the penetrating oil in and expand the metal to bust it loose. May take a few tries over a few days. Local machine shops can remove it you break it fairly cheap. Good luck.. That's a frustrating thing to deal with but you can usually get them loose.
 
Kevin Nicholls said:
I picked up an 81' 25 hp Evenrude and I'm going to have to reseal the lower unit on it. Trouble is the previous owner didn't grease the stud and now it's my problem. It's very corroded and won't budge I've tried penetrating oil and I'm having no luck. Any great ideas from the experts? Thanks, Kevin
Click to expand...

Is this a salt motor?
 
Oxy/Acetylene is the preferred method for getting enough heat into an aluminum casting. Mapp gas....maybe.
If this is the 20" version there is a bunch of area to corrode. Try and pull the gearcase and the extension, not just the gearcase if it is the 20".Put the nut back onto the end of the threads on the stud to drive it downward.
With the rest of the bolts loose and plenty of heat on the area you can also twist the gearcase a few degrees. This may help. Wear gloves!
At least try and get the gearcase/extension down far enough to cut the stud if you don't think you can remove it.
When you do get it off and re-sealed use a good marine grease on the entire bolt and stud shank, not just the threads. Go heavy on it.
If you are in salt water use a teflon thread sealant instead of grease. Tef-Gel works well for example. Stays longer and better than grease.
 
Thanks fellas for the help. A couple of hours of heat and beat did the trick. It will be greased correctly when it goes back on. It needs a reseal on the lower unit. It's the two piece type of lower, it doesn't look to terrible. Thanks again, I've looked at this site for awhile and will try to participate more.
 

Similar threads

crabbin77
Lower unit
Replies
6
Views
432
ripdmup
ripdmup
Douglasdzaster
Before I start my outboard that’s been sitting?
Replies
13
Views
3K
Douglasdzaster
Douglasdzaster
Douglasdzaster
1992 Yamaha 40 MSHQ lower water pump housing
Replies
13
Views
807
Douglasdzaster
Douglasdzaster
maintenanceguy
Help Removing Lower Unit from Old Force Outboard (with video)
Replies
3
Views
547
Pappy
Pappy
RaisedByWolves
Dag nabbit.......stuck bolt holding up my water pump repair.
Replies
11
Views
2K
nccatfisher
N

Latest posts

Top