Help with lraw water cooling. Having trouble identifying a part.

[briango]

Please forgive me if I describe this wrong, this is my first stern drive boat. I am a mechanic by trade and I have managed to get through most everything until now. I have been searching online for hours and I eventually came across this thread for reference but the link to the part I needed at the bottom of the thread was broken.

https://forums.iboats.com/forum/eng...nes-outdrives/444092-alpha-one-cooling-system

I have an Alpha one gen 1 with a 305 chevy engine that I bought with a blow engine, engine blew because one of the exhaust flappers failed and fell into the lower unit. I put in a reman engine and this is all in a 1985 19' Winner cuddy. We have been using the boat here and there and on the last outing engine temps started going up. We got back fine and today I went to investigate the issue today and found that the hose that runs from the power steering cooler to the tube that is fastened to transom plate was leaking so I pulled it off and there is a rubber bushing that goes around that tube that needs to be replaced. My issues is I cannot find any cooling system diagram for this part. Does anyone know what it's called and how I can find one, or a solid workaround?

I have the transom place serial number, but I have not had any luck with using it online.

For reference, when I put the new engine in installed new risers and manifolds, new marine water pump, hoses, etc. I will say Im a fit guy but getting back there to fix this issue is a real PITA and I don't want to have to do it again anytime soon.

Brian

 

[Baylinerchuck]

The spacer or bushing I think you are referring to comes with a new hose. You would need to know the serial number of the engine to get this hose. The one pictured might be right as I entered your year and engine size.

 

[achris]

..., engine blew because one of the exhaust flappers failed and fell into the lower unit. ...

Nope. A missing/failed exhaust shutter will not blow an engine. Something else caused the engine failure. HOW did the engine fail? (Hydrolocked, leg out of bed, head gasket blown???)

 

[briango]

Nope. A missing/failed exhaust shutter will not blow an engine. Something else caused the engine failure. HOW did the engine fail? (Hydrolocked, leg out of bed, head gasket blown???)

Blown head gasket, previous owner stated he was out in the boat when the engine "quit", He decided to remove the head to investigate which was obviously not the correct way to diagnose a blown head gasket, when I got the boat the engine sat for a year with the head off rusting the cylinder walls pretty bad. Can you explain to me why the shutters are there if not to keep out water, seems logical.

BAYLINERCHUCK, I did some more digging on the web and finally found what I was looking for, thanks for taking the time to respond.

 

[Scott Danforth]

the shutters are there as a check valve to stop water from flooding the engine if you cut throttle fast or a wave hits the back of the boat.

if a shutter drops because of lack of raw water pump maintenance, the loss of cooling water flow turns the exhaust from a hot mist at 200 degrees to pure fire at 1100 degrees. that exhaust fire simply burns the rubber off the flappers and burns the rubber exhaust tubes since the rubber burns at 250 degrees. this lack of cooling water also overheats the motor

over heating a motor due to lack of raw water flow can cause a head gasket to fail.

 

[tacitus]

the shutters are there as a check valve to stop water from flooding the engine if you cut throttle fast or a wave hits the back of the boat.

if a shutter drops because of lack of raw water pump maintenance, the loss of cooling water flow turns the exhaust from a hot mist at 200 degrees to pure fire at 1100 degrees. that exhaust fire simply burns the rubber off the flappers and burns the rubber exhaust tubes since the rubber burns at 250 degrees. this lack of cooling water also overheats the motor

over heating a motor due to lack of raw water flow can cause a head gasket to fail.

Ah, thanks, makes complete sense. I bet this issue I have was most likely what caused his. I should have checked it BEFORE i put the engine back in, but there were no overheating issues the first 2 times we went out, however, the last time I pushed the engine harder and spent more time on the water. As soon as the temps went up I cut the engine and let it cool all the way down and had a buddy tow us back in, we were not far from the boat ramp.Well, at least I learned a few things from this experience. I live in Jacksonville, Florida and I called 5 or 6 local Marine stores and no one had the hose in stock.

Brian
.

 

[achris]

I ran my 165 for over 8 years without an exhaust shutter (on the grounds that I didn't know what it was, or that they were important), and never damaged the engine, but I also never did 'engine cuts'....

Chris...