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#11
posted to rec.boats.building
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Can cooling water be to cold on a Mercruiser
Thanx for your replies.
According to this site: http://www.boatfix.com/freshkits.asp The rule of thump is 150 hours of sal****er use and 250 hours freshwater use. After that it is probably too late to install a freshwater cooling system. Is that right? Because if is not right I may concider installing fresh water system. The other Mercruisers here in Nuuk runs around 143 F (62 celsius degrees). But I have read that the optimum temperature for Mercruisers is around 76 F (80 celsius degrees). What temperature does your motors run in in the new york area or areas? Thanx again Jens-Erik |
#12
posted to rec.boats.building
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Can cooling water be to cold on a Mercruiser
skrev: Thanx for your replies. According to this site: http://www.boatfix.com/freshkits.asp The rule of thump is 150 hours of sal****er use and 250 hours freshwater use. After that it is probably too late to install a freshwater cooling system. Is that right? Because if is not right I may concider installing fresh water system. The other Mercruisers here in Nuuk runs around 143 F (62 celsius degrees). But I have read that the optimum temperature for Mercruisers is around 76 F (80 celsius degrees). What temperature does your motors run in in the new york area or areas? Thanx again Jens-Erik Regarding optimum working temp for Mercruisers I mean 176 F and not 76 F as I misspelled in the above submission |
#13
posted to rec.boats.building
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Can cooling water be to cold on a Mercruiser
If you exceed 150F or so with raw salt water cooling, the cooling water
will dump it's salt (a simple heat the salty water, the heated water can't hold as much salt, the salt gets dumped), clogging up your cooling system. And that's as far as I know why these thermostats are around 140 F ... |
#14
posted to rec.boats.building
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Can cooling water be to cold on a Mercruiser
Which also happens to be the dirty little secret about 4-stroke outboards.
4-stroke motors pump more fuel (past the rings) and moisture into the case than 2-stroke motors ...and the case oil is required for lubrication. Cars do this all the time, but they run a hot compared to an outboard and the moisture and fuel evaporates out (and is burned via the exhaust-gas return (EGR) valve back to the intake.) In a 4-stroke outboard or other 4-stroke salt-water cooled motor, you can't allow it to run hot enough to effectively vaporize the moisture and fuel in the oil else you get salt deposits in the motor. It's tough to design a good 4-stroke motor that runs well, doesn't get hot enough to salt out, yet runs as hot as it can otherwise. This is also why you should use only the best oil in your 4-stroke motor and change it often. And... it's also why inboard 4-strokes are best off with a freshwater cooling system and thermostat that lets them run hotter than an outboard could. Brian d "bowgus" wrote in message oups.com... If you exceed 150F or so with raw salt water cooling, the cooling water will dump it's salt (a simple heat the salty water, the heated water can't hold as much salt, the salt gets dumped), clogging up your cooling system. And that's as far as I know why these thermostats are around 140 F ... |
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