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Water in Oil

If you want to isolate the exhaust manifolds, remove their hoses at the T-stat... Then just take a hose and connect to two outlets together...
 
You want to plug the recirculation an raw water in hoses?
I want to test the block for internal crack...Blow 15psi into temp sensor port on thermostat housing. So I want the entire stat housing plugged except the temp sensor port..PS..The boat is still in the water in my slip
 
Smoke machines are very useful; I’ve fixed a couple of check engine light issues on my Jeeps with it but yea it could also be used for this problem…
 
Leave the recirculation hose connected ...measure the hose nipple for the raw water inlet, gat a 3" piece of reinforced hose, and then plug the open end...you can use a copper cap or a pvc cap and a clamp..
 
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