Originally Posted by CameronVP
Thanks for the reply. By compression test, I meant on the coolant system. Also, there is no coolant in the raw water out into the ocean. Also important, we can definitely see coolant in the bilge. What do you suggest we do first? Checking gaskets first?
You state you are losing up to half a gallon per run of the engine
, that is a serious amount of water. I would be really worried if I was losing half a pint! I would strongly recommend you do not run this engine
for long periods of time until you find the issue. Otherwise you potentially will overheat the engine to the stage where you will be in for big dollar repairs
such as head
gaskets or worse.
The leak should be obvious if you are losing that much water, and since you are seeing the coolant in the bilge, then this should be a relatively easy leak to find. You state you have pressure tested the coolant side and "all seems OK", but since you are losing coolant and seeing it in the bilge then the imperial evidence is that the coolant system is not water tight and it is definitely not OK.
The stated greater loss while healing or heavy seas is strange, but could indicate a loose clamp that the heavy sea motion is working this clamp loose.
Obtain the Leaman service
manual if you have one and religiously follow the drawing, check every hose clamp and hose. Tighten each as you go. If a clamp or hose seems dubious, replace with a new one. Check all stud nuts on the heat exchanger are tight against the engine block. Even if you do not have a manual, cooling systems hoses are simple to follow. Also check where the coolant water circulation pump
is, make sure that the coolant is not coming out via a worn seal on the pump
shaft. If it is, you will see traces of water leakage on the engine block below the water pump
Once you have done that you should have found the leak site and have fixed it. Clean and dry the bilge so you have no old coolant showing. Now fill the coolant system up and run the motor
for say 10 minutes until up to temperature. Shut down and investigate if you have solved
the issue. If you still see coolant in the bilge, wait unit the system is cooled sufficiently to refill, sprinkle white talcum powder on each and every joint and run the motor
again until up to temperature. Shut down and check each location to see where the leak is showing on the talcum power.
Post back your resultants