MCM140 - Auxiliary Hot Water Heater installation question

mrsaundep

Seaman
Joined
Jun 9, 2009
Messages
55
View attachment water pump.jpg.pdfMercruiser MCM 140, 3.0L, #5568367

I want to fit a cabin heater to my boat, to be run off the engine raw water cooling ?open? system. I have surveyed the installation before I have purchased the components and found that the water circulating pump is not OEM and does not have the fitting that is to be drilled out 3/8? for the return hose connection (Position ?b? on attached manual extract).

Is there another suitable point in the engine cooling circuit where I can fit the return hose connection?

If not, could I drill and tap the non OEM pump housing in this area and fit a hose tail connector?

Tks in advance.
 
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