Thread: Over heating
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Old 04-26-2020, 03:14 PM   #15
Lepke
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City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
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Don't forget, there's 2 sides to cooling. I've fixed a lot of engines for overheating that someone else couldn't and the engine only needed a good coolant flush. Old coolant will allow rust to build on the water jackets and passages, hurting heat transfer.

The coolant with the cap on should have a higher pressure than the exhaust. By your comments, I assume you send some of the exhaust water over the side and not thru the exhaust. So that should indicate you have enough flow but not necessarily adjusted right. But you have a partially plugged exhaust elbow.
A completely filled coolant system should eject some coolant from the cap as the engine heats. Normally an overflow tank catches this and feeds it back to the engine as it cools.

It could be you're over propped for the rpm or a lot of bottom/prop growth. Black smoke would indicate you're working the engine too hard.
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