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77 Evenrude 15hp Cooling system

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WillyC

Member
I have a 77 Evenrude 15 hp that I bought used. After about 25 hours water quit coming out the pee hole and started coming out the exhaust ports instead.

I replace the water pump, then pulled off the water cover on the engine. Everything inside was covered in salt. Obviously a PO ran the motor in saltwater and never flushed it. Since then

I’ve had the water cover off half a dozen times. I’ve flushed all the channels wi thing like CLR, vinegar, lime away, and clean water. I can get water to gravity flow from the cooling jacket to the water pump. I can use mild pressure to get water upstream from the pee hole and out the water pump. Nothing flows from the thermostat socket anywhere. Compressed air into the pee hole hose comes out the thermostat socket.

I just put everything back together and I get a trickle out the pee hole, but most flow from the war pump comes out the exhaust port.

I’d appreciate any thoughts or advice.
 
Most of the water should be coming out of the exhaust ports, it should start coming out fairly quickly. is your Pee hole plugged?
 
There is only a dribble coming from the pee hole. Prior to repeated flushing with salt solvents there was nothing coming through the pee hole.
 
Ok I’m at an impass. Everything is disconnected, bolts are all removed. The power head is broken loose from the gasket and it wobbles around inside of the bottom housing freely. But I can’t get it to lift out. I suspect it’s the same salt crust crap I’ve been dealing with all along. There a coating of salt scale around the orifice of the larger 1”+ diameter tube that opens into the area where the lower unit mates with the shaft. I’ll try to attach a photo. Advice please.


IMG_2491.jpeg
 
It should, but it’s stuck. Other than wobbling, it won’t budge. I’m going to start on the crusted area in the photo with salt solvent and brass wire brush later.
 
It’s supposed to. The lower housing is completely free from the power head. The power head will not break free from the the other components below the housing. I suspect the larger tube is seized to the place where it mates to the area where the shaft and lower unit join. I’ve been treating that union with CLR,brass wire brush, tapping the lip with a flat punch. Nothing is budging. It obvious that anything involving bolts and gaskets is free. Where the holdup is is up for debate.
 
Is the area I described as being crusted where the shaft and Lower unit join safe to apply heat with a Map or acceteline torch?
 
The large round tube has NOTHING to do with it !!----Some want to argue.----There is no heat needed.----Shift linkage on side of the block is disconnected ?
 
Good news, better news, bad news. I got the power head off. about half the gasket turned to superglue. I forced an old wood chisel in at some extreme angles and broke it loose. Once I got the tubes off of the power head I found that the grommet is completely intact. It’s fairly new. The bad news is when I use a squeeze bottle to squirt water upstream in the channel towards the thermostat and water jacket it goes no where. When I try to put a pipe cleaner up the same channel it only goes a quarter inch and stops. Any thoughts or advice?
 
Air worked. Water flows both way. Ordered new grommet and gasket. Ready to reassemble when they get here. Thanks everyone!
 
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