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#1
posted to rec.boats.cruising
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overheating mercruiser
i own a 1988 winners boat and it has 5.7 ltr 350 small block chevrolet with
an alpha one stern drive and it overheats . the engine is new and the outdrive has been gone through by a cert. Mercruiser tch. i have replaced waterpump, impeller,gauge,some hoses and have went as far as to take out the engine and outdrive to reinspect all the hard work we have done just to have an good runnin boat 2 enjoy Lake Erie with . i'm about at the point and takin revenge out on my wonderful craft because i'm lost for answer so PLEASE HELP . ... stranded and overheatin in the middle of Lake Erie and need either a tow or a ___________ ..... lets put are heads together and try to solve my dilema!!!!!!!!!! |
#2
posted to rec.boats.cruising
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overheating mercruiser
On Wed, 16 May 2007 03:51:24 GMT, "ricksbasseyetus" u34236@uwe
wrote: i own a 1988 winners boat and it has 5.7 ltr 350 small block chevrolet with an alpha one stern drive and it overheats . the engine is new and the outdrive has been gone through by a cert. Mercruiser tch. i have replaced waterpump, impeller,gauge,some hoses and have went as far as to take out the engine and outdrive to reinspect all the hard work we have done just to have an good runnin boat 2 enjoy Lake Erie with . i'm about at the point and takin revenge out on my wonderful craft because i'm lost for answer so PLEASE HELP . .. stranded and overheatin in the middle of Lake Erie and need either a tow or a ___________ ..... lets put are heads together and try to solve my dilema!!!!!!!!!! On the hard, with plenty of water to the earmuffs, does the engine also overheat? Brian W |
#3
posted to rec.boats.cruising
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overheating mercruiser
* ricksbasseyetus wrote, On 5/15/2007 11:51 PM:
i own a 1988 winners boat and it has 5.7 ltr 350 small block chevrolet with an alpha one stern drive and it overheats . the engine is new and the outdrive has been gone through by a cert. Mercruiser tch. i have replaced waterpump, impeller,gauge,some hoses and have went as far as to take out the engine and outdrive to reinspect all the hard work we have done just to have an good runnin boat 2 enjoy Lake Erie with . i'm about at the point and takin revenge out on my wonderful craft because i'm lost for answer so PLEASE HELP . .. stranded and overheatin in the middle of Lake Erie and need either a tow or a ___________ ..... lets put are heads together and try to solve my dilema!!!!!!!!!! My experience is with smaller sailboat diesels, so it may not apply here. However, I've seen two causes of overheating that can go undiagnosed. One is a air lock in the line, in particular a water heater line which leads up from the engine, thus making it hard to completely fill the lines. The other situation is a problem in the heat exchanger. If it is partially clogged, it will work fine at lower loads, but overheat when the load goes beyond its ability to remove heat. Unless you can measure the heat content of the waste water, there is not way to determine this is the problem without looking inside. In my case, I had a bit of eel grass that clogged several of the internal HE pipes. Once figured out, it was easy to deal with. I was reading yesterday about a case where Yanmar 75 hp engines had heat exchangers that had been tested in manufacturing with a bad solution that left a coating on the inside that reduced efficiency. The problem had plagued the owner for several years until discovered a few weeks ago. |
#4
posted to rec.boats.cruising
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overheating mercruiser
Ahhhh... thermostat stuck?
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#5
posted to rec.boats.cruising
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overheating mercruiser
thanks Brian for your reply and your answer is that the engine does not
overheat with the earmuff on Only when you have the boat in drive and under a load and i've looked at about everything!!!! WHAT YOU THINK ????? Brian Whatcott wrote: i own a 1988 winners boat and it has 5.7 ltr 350 small block chevrolet with an alpha one stern drive and it overheats . the engine is new and the [quoted text clipped - 6 lines] or a ___________ ..... lets put are heads together and try to solve my dilema!!!!!!!!!! On the hard, with plenty of water to the earmuffs, does the engine also overheat? Brian W -- Message posted via BoatKB.com http://www.boatkb.com/Uwe/Forums.aspx/cruising/200705/1 |
#6
posted to rec.boats.cruising
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overheating mercruiser
NO MIKE , THE THEROSTAT IS NOT STUCK OPEN . I'VE ALREADY THOUGHT ABOUT THAT ..
... NEW WATERPUMP, NEW HOSES , NEW IMPELLOR, I'VE CHECK OUT THE ENGINE TIMING AND EVEN CHECK HAD THE NEW HEADS CHECK OUT BECAUSE I THOUGHT THERE WAS THE PROBLEM BUT, NOT....... NEXT QUESTION PLEASE!!!!! wrote: Ahhhh... thermostat stuck? -- Message posted via BoatKB.com http://www.boatkb.com/Uwe/Forums.aspx/cruising/200705/1 |
#7
posted to rec.boats.cruising
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overheating mercruiser
"ricksbasseyetus via BoatKB.com" u34236@uwe wrote in
news:724ad9421fa33@uwe: NO MIKE , THE THEROSTAT IS NOT STUCK OPEN . I'VE ALREADY THOUGHT ABOUT THAT .. .. NEW WATERPUMP, NEW HOSES , NEW IMPELLOR, I'VE CHECK OUT THE ENGINE TIMING AND EVEN CHECK HAD THE NEW HEADS CHECK OUT BECAUSE I THOUGHT THERE WAS THE PROBLEM BUT, NOT....... NEXT QUESTION PLEASE!!!!! If the timing's fine....I want a compression check on all cylinders, not just the ones you can get to. I wanna know of the head gasket's leaking or the head is cracked, both of which will make the compression suck. (Or, maybe a cracked ring, but let's be more positive than that for now...(c Because of the new heads, I'm thinking they may be warped, even a tiny bit is enough to make the head gasket leak and go bye bye...causing it to overheat because it's running LEAN...never a good thing. What color is the exhaust pipe inside? Dark Chocolate brown, I hope. Talk to me about what ALL, not just a couple of those plugs look like after you pull them out for the compression check. Any of them look white? or very light brown? (lean) Are they all the same color? What color? So many questions....I'm going to bed. Let us know these answers. We milled the heads flat on a GM350 that was overheating and running lean. Temperature dropped and the thermostat closed! Acceleration, with ALL the cylinders pulling like mad, not just half of them, was most impressive....(c; Pray it doesn't need a ring job or has leaky valves. Does any cylinder "wheeze" when its cranking before it fires? Start easy cold? Larry -- Grade School Physics Factoid: A building cannot freefall into its own footprint without skilled demolition. |
#8
posted to rec.boats.cruising
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overheating mercruiser
* ricksbasseyetus via BoatKB.com wrote, On 5/16/2007 11:17 PM:
thanks Brian for your reply and your answer is that the engine does not overheat with the earmuff on Only when you have the boat in drive and under a load and i've looked at about everything!!!! WHAT YOU THINK ????? So have you looked into the heat exchanger? |
#9
posted to rec.boats.cruising
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overheating mercruiser
Combustion chamber leak into the water jacket could be pushing away
cooling water. Or something not right with the exhaust manifold waterfall plumbing. Have you looked at the condition of the plugs - specially looking for squeaky clean ones? Brian W On Thu, 17 May 2007 03:17:57 GMT, "ricksbasseyetus via BoatKB.com" u34236@uwe wrote: thanks Brian for your reply and your answer is that the engine does not overheat with the earmuff on Only when you have the boat in drive and under a load and i've looked at about everything!!!! WHAT YOU THINK ????? Brian Whatcott wrote: i own a 1988 winners boat and it has 5.7 ltr 350 small block chevrolet with an alpha one stern drive and it overheats . the engine is new and the [quoted text clipped - 6 lines] or a ___________ ..... lets put are heads together and try to solve my dilema!!!!!!!!!! On the hard, with plenty of water to the earmuffs, does the engine also overheat? Brian W |
#10
posted to rec.boats.cruising
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overheating mercruiser
What does the compression read in each cylinder?
Brian W On Thu, 17 May 2007 03:27:59 GMT, "ricksbasseyetus via BoatKB.com" u34236@uwe wrote: NO MIKE , THE THEROSTAT IS NOT STUCK OPEN . I'VE ALREADY THOUGHT ABOUT THAT .. .. NEW WATERPUMP, NEW HOSES , NEW IMPELLOR, I'VE CHECK OUT THE ENGINE TIMING AND EVEN CHECK HAD THE NEW HEADS CHECK OUT BECAUSE I THOUGHT THERE WAS THE PROBLEM BUT, NOT....... NEXT QUESTION PLEASE!!!!! wrote: Ahhhh... thermostat stuck? |
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