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| Mercruiser cooling system |
| Author |
Message |
    
Mark
| | Posted on Friday, May 11, 2001 - 11:11 am: | 
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How does the mercruiser cooling system work? I have a 5.7 with an Alpha I stern drive and I'm not sure where the water is picked up and where it exits? How can I determine if its operating correctly without the obvious of overheating? I'm new to the boating arena and look to you vets for guidance. Thanks!! |
Andrew (Andrew)
| | Posted on Tuesday, May 15, 2001 - 09:50 pm: |
|
Mark,
You might want to start by reading one of the manuals that cover that engine and drive:
Mercruiser : Stern Drive Shop Manual 1986-1994 : Alpha One, Bravo One, Bravo Two & Bravo Three
Regards,
Andrew Menkart
 |
fishnfool
| | Posted on Wednesday, May 23, 2001 - 10:43 pm: |
|
Mark, Andrew is correct in that you should get a "factory" manual for your drive system. To answer your question, your drive picks up water through the bottom half of your lower unit. Just ahead of your prop you'll find a spot where there are about five slots vertically cut into each side of the housing..... that's your raw water pickup. There's an engine-driven water pump in the lower unit that pulls water and sends it to the engine pump(which is the same as a water pump on your car/truck) It cools the engine much the same as a regular cooling system, and from there the water exits through the exhaust manifolds and the elbows. I always knew mine was working by being able to touch the elbows while it was running. The cooling water also cools the exhaust on the way out and I never burnt my hand at all..... seems primative but it worked for me!!!!! |
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