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Old 03-13-2016, 10:00 AM   #20
cappy208
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City: Cape Cod
Vessel Name: Slip Aweigh
Vessel Model: Prairie 29
Join Date: Oct 2013
Posts: 1,219
Good trip! Nice to hear you are bringing her home.

Regarding the engine Oheat. Try switching the radiator caps. Eliminate one as being unable to keep pressure in. Did the overflow tank burp on the port engine?

Check the amount of antifreeze/coolant. Make sure it is to spec. (or at least the same from one engine to the other.) Peak/Antifreeze tester PKFOAB - Read 2 Reviews on Peak #PKFOAB

When you are running both in neutral at the dock, run them up to speed, and go out and put a bucket under each exhaust. Have a helper time how long it takes to fill up a bucket. If the port engine is pumping noticably slower than the stbd, change the impeller. Heck, I would change both anyway! Don't know how old they are!

A good way to find where the heat issues build up is an IR thermometer. Non-Contact Infrared Thermometer With Laser Targeting
These are great to shoot temps from engine part to engine part to compare where heat build up is occurring so you can get an idea what to look for.

A common issue is the water injection elbow in the exhaust. When they get corroded up they restrict the amount of water flowing out of the engine (less cooling) and it effects the whole shebang.

Good luck!
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