How to Verify Cooling Path on 95 90/65 hp v4 Jet

btomlins

Seaman
Joined
Oct 31, 2013
Messages
61
Guys, before I fire up my rebuild is there a way to verify that I've got water flow through each cylinder? Can I use the flushing port at the bottom of the lower unit, connect garden hose and then remove each hose from the bottom of each head that goes to the thermostat housing? I should see water flow thru each hose or does the water pump need to be turning? If they both show flow and I re-connect the hoses and pressure up I should see water exiting the bottom of the lower unit as well indicating that the bypass path is clear too? The t-stats have been replaced.

The OMC manual says on initial break in for the first 10 minutes run the engine at fast idle. Is this to create higher water flow/pressure to fill engine with cooling water because at idle it might not be sufficient? I've verified the high temp sensors on each head and they are working along with the audio alarm circuits. I've got an infared gun to watch temps once it's running.

Just crossing my T's and dotting my I's before I cook and brand new rebuild.
 

durban

Master Chief Petty Officer
Joined
May 27, 2011
Messages
894
Re: How to Verify Cooling Path on 95 90/65 hp v4 Jet

connect a garden hose to the copper pipe where it goes into the water pump ,[ first you have to remove the lower unit ] turn the hose on wait a couple of min,ts water will start filling up the motor then start you will be all good , ive done this before you do not need to remove anything providing the thermostat works
 
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