89 Evinrude 50hp overheat alarm sounds

[starcraftkid]

Re: 89 Evinrude 50hp overheat alarm sounds

My next step will be to pull the power head. I've done everything else.
I ordered the gaskets today.

Meanwhile, I solved my immediate motor issue, I picked up a minty clean 2003 50hp Johnson which came off a neighbor's 14' Boston Whaler. Apparently he took it to a local dealer to be winterized and serviced, they told him that since it was getting old, he was better off just buying a new motor, which he did. (At another dealer). He bought a four stroke Yamaha.
I guess I can't knock the dealer that won't service an older motor, they got me a good used motor for dirt cheap. I got it in trade for a used garden tractor with a snow blower on it that I had sitting in the shed out back. He only valued the motor at the $500 they offered him in trade for it. I doubt if that motor had been in the water more than a dozen times since he's had it. He takes one vacation per year, takes the boat with him and uses it for fishing where ever he goes, then spends the next two weekends cleaning it and flushing it out.
It runs perfect, I put a new impeller in it, a set of plugs, and changed the lower unit oil and hung it on the boat. Weather permitting, its going to get tested out tomorrow. He's happy, he's got the thing out of his garage, and I got a running motor, ready to use.
It gives me some time to play with the older motor now, at least the newer one gets me back on the water.

 

[starcraftkid]

Re: 89 Evinrude 50hp overheat alarm sounds

I pulled the power head today on the overheating 50hp, there was a ton of black goo clogging up the entire area below the power head, it looked to be nearly completely blocked off. I took the whole exhaust tube off, scrubbed out the mid section real well, installed all new gaskets and put it back together.
It was too late to fire it up by the time I was done, I probably won't get to that till next weekend.
It looked like there was probably no way for water to get out the bottom, maybe even enough to block exhaust flow. The goo was mostly black, but some was white and milky. It was the consistency of vaseline. Once I scrubbed it all clean it all looked like new, nothing was pitted or corroded. I'm wondering now if it wasn't the exhaust being bottled up not the water that was causing the overheating?
I'm also wondering what all that mess was? It was too much to be just normal build up, maybe a case of some over zealous fogging for storage?
It reminded me of pulling the valve cover off of a car which was deprived of oil changes it's hole life. The odd part is that the motor otherwise could almost pass for new.