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  #11  
Old 06-25-2008
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Going a little back, Rchad, first look to the flow of a similar boat on your marina and visually compare, then you can take indirect measurement like your engine temperature under different revs/load, wich ultimately is what you want to be under control. Finally, put your hand on the discharge and that should be somehow "warm" not disconfortably hot, neither cool at all. Remember this is an integrated system where strainer, pump, exchanger, raiser, waterlock, mufflers, lenght of hoses, diameters, etc... should be matched. Best procedure, is to contact dealer or a local experient mechanic.
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Last edited by negrini; 06-25-2008 at 03:06 PM.
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  #12  
Old 06-26-2008
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raw water intake

I did get some very useful info from my local Yanmar dealer. He said that the rate of flow from my Yanmar 2GM20F should be 2 GPM at 700 to 11 GPM at 3300 RPM.

Thanks to all for suggestions..now back to solve the mystery
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Old 06-26-2008
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Quote:
Originally Posted by beej67 View Post
Where were you able to find pressure rated hose that's clear?
I assume this was addressed to me?

I don't know as it's pressure rated. That's unimportant in this application. All I'm talking about is a 3' length of temporary hose with a double-ended barb in one end that's used to suck RV anti-freeze out of a bucket as part of winterization prep.

Jim
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