Evinrude big twin 40

[racerone]

If you were skiing behind the wonderful 40 , you would see water pouring out of the exhaust relief.-----Then when you dropped off the skier and at idle lots of water vapor / " steam " would pour out of exhaust relief.----When engine settled after idling a bit , water would spit out of exhaust relief again.

 

[Open Water]

Well I spoke too soon. The lower unit still has water getting into the oil. Went for a ride on Lake Minnetonka yesterday. Found out this 14’ is no match for the wakes made by the rigs on that lake. The only part I haven’t changed is the driveshaft. Gave it a good run, from Gray’s bay landing to a restaurant in Excelsior, and back. 10 miles total. If you remember the bearing under the top seal was in pieces. New bearing and seal. I could feel wear on the driveshaft but it was smooth. I’d like to see clean oil after I replaced all seals and o’rings.

 

[tphoyt]

I can’t remember if you did a pressure or vacuum test or not. I would do a pressure test and spray soap water around any seals if nothing bubbles up drop it in a bucket water while under pressure and see if that reveals anything. If not try a vacuum test some seal can leak in one direction but not the other.

 

[Open Water]

H

I can’t remember if you did a pressure or vacuum test or not. I would do a pressure test and spray soap water around any seals if nothing bubbles up drop it in a bucket water while under pressure and see if that reveals anything. If not try a vacuum test some seal can leak in one direction but not the other.

Had Pressure test done before I changed seals and o’rings. Guy said it held all night. Go figure, but I was getting water in. The bubble test sounds good, at least it’s something I can see. What do I use? Tube, gauge, stater valve ? How much air pressure?

 

[jimmbo]

If the Driveshaft is Worn/Corroded, all the Seals in the World aren't gonna fix the Problem

 

[tphoyt]

H

Had Pressure test done before I changed seals and o’rings. Guy said it held all night. Go figure, but I was getting water in. The bubble test sounds good, at least it’s something I can see. What do I use? Tube, gauge, stater valve ? How much air pressure?

There are a few way to get air in. The adapter from the Lu oil pump bottles came in very handy.
I use them on a piece of hose with a schrader valve it. Around 10 psi is all that needed. You don’t want to try and blow a seal.

 

[Open Water]

If the Driveshaft is Worn/Corroded, all the Seals in the World aren't gonna fix the Problem

New driveshaft is 200.00 I was leaning in that direction. I see now there is supposed to be a heat shield over the control wires leading to the lower unit. We’ll see if that is available. I’ve got time, won’t see hard water here till about Thanksgiving.

 

[jimmbo]

https://www.marineengine.com/newparts/part_details.php?pnum=OMC0309807

 

[racerone]

Should be lots of driveshafts on E-bay.----These were the same for many years.

 

[Open Water]

https://www.marineengine.com/newparts/part_details.php?pnum=OMC0309807

This sat for 4 days, it’s better. I’ve got the parts ordered.