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#32
07-18-2009, 11:13 PM
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This is on the 82 150 you posted about in other posts? If so the only warning on it should be overheat.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#33
07-19-2009, 11:21 AM
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This is. If it is an overheat then why is the water coming out of the discharge cool? The last time it went off I idled back and felt the water coming out and it was cool.
I'm confused on why it only happens at WOT.
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'78 Cuddy with '82/'88 Johnny/Rude 150 
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#34
07-19-2009, 12:25 PM
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The water coming out of the pee hole comes out from where the water first enters the powerhead if IIRC on the cross-flows. It would always be cool. I would check your bypasses for the T-stats if it was mine and make sure they are opening. Also how old is the water pump impeller? A weak impeller will give low water pressure at higher RPM's and cause the bypass not to open and cool the engine off under load. When the horn is going off next time put your hand on the block and heads and see if they are hot or cool to the touch. You could have a back feed in the harness setting the buzzer off.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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#36
07-20-2009, 08:07 PM
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Looked at the T-stats today. I think I found my problem. Whoever changed the last used a sh1t load of RTV silicone and mostly blocked the passages.
The pressure release valve was slightly melted. Is this release valve used to prevent overheated condition? The T-stats open at about 160 deg, both of them. So I put them back in. I'll try to take the boat out tomorrow and check them.
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'78 Cuddy with '82/'88 Johnny/Rude 150
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#37
07-20-2009, 11:11 PM
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The bypass is meant to open when the engine reaches roughly 3000 RPM's so that the T-stats are bypassed when the engine is running under load. @ strokers tend to need alot of heat at low RPM's to burn the fuel mixture, but under load they want to be run around 100-130 degrees to prevent a piston from sticking. The water pressure that the water pump produces is what opens the bypass on your engine, so a weak impeller will not make enough water pressure to open the bypass. Also the T-stats don't flow enough water at speed to allow the engine to run cool, so the bypasses are a requirement to allow the cooling system to function at all RPM's.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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#38
07-21-2009, 09:17 AM
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I see but the water passages in the t-stat housing were partially blocked by the RTV. Even if the bypass did open I wasn't getting good water flow around the head, no matter the impeller condition.
I'm going out later to see if there is an improvement. The impeller is next on the list. I going to change it anyway.
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'78 Cuddy with '82/'88 Johnny/Rude 150
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#39
07-22-2009, 10:58 PM
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It might scare ya to see what that impeller looks like. Could be "not too bad", or "HOLY $&%!".
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20
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