where to plumb in water heater on mercruiser 5.7

findinghomer

Petty Officer 1st Class
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Nov 7, 2009
Messages
271
engine is 1997 mercruiser v8 5.7. 350 ci, alpha one drive. i have atwood water heater that i would like to plumb into this cooling system. just want to be sure i do it correct. anyone got this same setup could give me pointers? thanks in advance.
 

Bondo

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Apr 17, 2002
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71,099
Re: where to plumb in water heater on mercruiser 5.7

Ayuh,... The Hottest water, at the greatest pressure is in the intake manifold, behind the T-stat...
You should have a 1/2" pipe plug in the cooling passage of yer intake...

The lowest pressure point available is into the 1/2" pipe plug in yer circulating water pump...
That's yer return point to insure Flow...
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: where to plumb in water heater on mercruiser 5.7

Here is how it shows to do it in the manual.
 

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