Evinrude 110 lower unit corosion

[freeisforme]

I picked up a great running 1989 Evinrude 110 today, its a saltwater motor that had a new power head last fall. (143 psi compression on all 4 cyl.)
It runs perfect, pumps water and cost me nothing.
The problem is that the lower unit leaks water like a sprinkler with the ears on it in the yard, water squirts out all over. It has clean oil, shifts fine but is well pitted from the inside.
My question is, how durable are these gear cases? I did a pressure check and all is fine now, and it had a new w/p installed in March.
The motor will also need to have power tilt and trim added, but I have a donor motor which will supply that. The mid section and bracket are clean, no real corrosion there at all. Just the lower unit.
Off hand, what years will interchange lower units?
I don't mind the external water leaks in the case, and it has good water pressure when running, but I am concerned about the gear case being close to perforating into the gear oil area.

 

[reelfishin]

Re: Evinrude 110 lower unit corosion

If the existing lower unit is working and pressure checks OK, I'd probably just clean it up, give it a good coat of epoxy paint to prevent any further corrosion and run it for now. Clean it up, spray it with some zinc chromate primer and paint well, it will no doubt add a few years to it's life. I'd also add a few fresh zincs as well.

That lower unit looks to be the same from about 1987 to 1991 by part number.
Others may fit but I've not tried.

 

[jonesg]

Re: Evinrude 110 lower unit corosion

I thought the same thing when I first ran mine on a hose " oh no, water's coming out every joint", its normal.

Once underway the prop draws it all out the low end.

 

[freeisforme]

Re: Evinrude 110 lower unit corosion

The lower unit really don't even look that bad, it was just that it sprayed water from about 20 different points with the ears on it. If I had put it in a barrel, I'd have never given it a second thought. I pulled the lower unit and it looks fine, no sign of corrosion around the pump, which looks new, and no debris or corrosion down in the intake area. I still scrubbed it clean and gave it a good coat of primer and some epoxy paint since I will be in saltwater some of the time. I was actually pretty surprised at how clean it looked in there.

For an older motor, its pretty clean overall, even the external paint is good. The part I can't figure is why this lower is so porous. My 70 hp don't leak a drop and that's been in salt since it was new in 1985.
This thing leaks from points I can't even see with the hose off.
I guess the important part is that it works fine as is.

I had it out for an hour yesterday and it runs like a new motor. I can't wait to get it mounted on my aluminum boat. (It came with a free boat and trailer which I'll sell off soon). The trailer is ok, but the boat is glass, and I've become real partial to aluminum boats. Besides, it will push a 600 lb aluminum boat far better than the 1200 lb glass trihull it's on now.

 

[reelfishin]

Re: Evinrude 110 lower unit corosion

Just a thought, I had a V4 here today that was doing the same thing, I pulled the lower unit to do a water pump impeller and found the exhaust tube gaskets cracked, and lots of dirt trapped between the housings. It looked like it had been put together in the water in a hurry. After I replaced the gaskets, w/p and cleaned up the mating area and painted all was as new. I've found that that era Johnnyrude is pretty tough when it comes to salt corrosion, I've had a few that looked like Swiss cheese that worked just fine and went on for many years with no issues.