1990 Johonson 40 hp chocolate milk dribble

[karlow1]

After fishing and the motor is left in the tilted up position. On the last two trips,I have noted days later about a oz of the yellow/brown stuff has been dribbing from the rear of the lower part of the engine. The is right above the cav plate. There is a little opening in the back near the shifter. When I pull the plug to check the oil, it looks OK. I assume the shifter seal is failing. I have orded all of the seals for the lower assembly. How much of a job is it going to be? Is it a mater of disonnectiong the shifter up top and four bolts on the bottom. Is there any hidden bolts or special techniques and tools required? She has been running great since that little issue with the connecting rod comming apart.

KP

 

[tashasdaddy]

Re: 1990 Johonson 40 hp chocolate milk dribble

hidden bolts under trim tab.

 

[kenmyfam]

Re: 1990 Johonson 40 hp chocolate milk dribble

Yes, they like to hide one on you !!!!

 

[karlow1]

Re: 1990 Johonson 40 hp chocolate milk dribble

Thanks guys, If I could only get that bolt to move I would be doing some good hear!

KP

Catalina for the holiday on Topless.
Life is good. That bolt might not survive when I break out the impact.
Sat. I will be running the smoker, and breaking that bolt, or removing it!
What ever works!

KP

 

[HybridMX6]

Re: 1990 Johonson 40 hp chocolate milk dribble

heat it up if you can, then give it a go.

 

[karlow1]

Re: 1990 Johonson 40 hp chocolate milk dribble

So far I have not burned the paint off of it yet.
I have been heating it the last two days. I get it too hot to touch with the P-torch. My friend loaned me two guns so something is going to pop soon.

KP

 

[northernmerc]

Re: 1990 Johonson 40 hp chocolate milk dribble

You're sure that its not unburnt fuel/oil dripping there? If your seals were gone, would water not enter the oil in the leg and give the gear oil a milky appearance?

 

[karlow1]

Re: 1990 Johonson 40 hp chocolate milk dribble

Your guess is as good as mine. I did find some of the coco under the cowing gasket. As for the bolt, there is one thing to say Impact gun! The 250 Ft-lb electric one from HF did not get her done. My buddy loaned me a 1/2" drive one. A little air from the compressor and nothing seems to happen. More heat and gray gue started to appear around the bolt. More heat Scotty! A little rat-ta-tat, and sure she moved. Note the gun setting in at it's min. setting.
The bolt was still hard to turn. The penetrating oil only made it about 1/4" deep.
Then bolt had aluminum oxide stuck in the treads. Nothings broken yet !

 

[Texasmark]

Re: 1990 Johonson 40 hp chocolate milk dribble

Guess I missed something. Best I can tell the hole you are talking about drains your exhaust housing in the mid section. Chocolate or yellow means water and oil. Oil can come from unburned engine exhausted oil which is normal and water can come from cooling water, or condensation, especially in cooler climates when the engine is used for trolling, a lot of idling, or other things that don't really get things hot.

Before you remove the lower unit, unless you just want to, I'd check the oil in the lower unit and see if it is some color other than yellow or chocolate. I think OMC uses a honey colored oil whereas Merc uses a bluish-black oil. Honey is yellow yes, but is a clear yellow, not a yellow you can't see through.

Sounds like you are fixing to tear something up.

Course if you need a new waterpump impeller then so be it on the removal.

My 2c

Mark

 

[karlow1]

Re: 1990 Johonson 40 hp chocolate milk dribble

OK, things are not very clear! I needed to check the bottom end anyway. She had some water in it when I first got this boat. I found some fissing line on the shaft and assumed the seal had been compromised. I have run here all season with no signs of trouble until the last few trips. When i check the oil in the bottom end, it looks OK, but I was only checking a few drops.
I pulled the bottom end. The key was to use an impact gun. 1/2" on min setting.
A little heat and a little rat-tat-tat. There was a lot of the coco in the the the top rear of the lower end, but no real sign of it inside. I pulled the seal around the shifter, then the drive shift seal assembly. The oil looks OK as well. The water pump was about to fail. A little corrosion here and there goes a long way.
The impact is the proper tool to deal with it. I'm short some parts to put her back together. It is strange, but it might end up being just unburned fuel in the end. It's not that cold here on the Best cost yet. maybe 50F in the morning and 60-70 mid day the last few time she was out. We were doing a lot of trolling, but i would typically run her at speed a few min getting back to the dock.

KP