I have just purchased a 2005 Hunter 33. I have the 29hp Yanmar Diesel. I started it up for the first time this season and had coolant pooling underneath the engine. I could not see where it was leaking from. The coolant resevoir is empty when the engine is not running. Someone suggested that the engine could have been over filled from the previous owner at the end of the season. Does anyone have any experience with this?
Antifreeze pooling in engine compartment.
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I have just purchased a 2005 Hunter 33. I have the 29hp Yanmar Diesel. I started it up for the first time this season and had coolant pooling underneath the engine. I could not see where it was leaking from. The coolant resevoir is empty when the engine is not running. Someone suggested that the engine could have been over filled from the previous owner at the end of the season. Does anyone have any experience with this?
If in not the reservoir, hoses, radiator cap,....
one other place to check is the vaulves that allows you to empty the coolant from the ingine block. One located on either side of the engine, usually attached to a long clear small diameter plastic hose that directs the coolant to the bilge under the engine. I hope more intelligent people can give more clues. good luck abe
one other place to check is the vaulves that allows you to empty the coolant from the ingine block. One located on either side of the engine, usually attached to a long clear small diameter plastic hose that directs the coolant to the bilge under the engine. I hope more intelligent people can give more clues. good luck abe
If in not the reservoir, hoses, radiator cap,....
one other place to check is the vaulves that allows you to empty the coolant from the ingine block. One located on either side of the engine, usually attached to a long clear small diameter plastic hose that directs the coolant to the bilge under the engine. I hope more intelligent people can give more clues. good luck abe
one other place to check is the vaulves that allows you to empty the coolant from the ingine block. One located on either side of the engine, usually attached to a long clear small diameter plastic hose that directs the coolant to the bilge under the engine. I hope more intelligent people can give more clues. good luck abe
don't run the engine
If the coolant overflow tank is empty you have a problem. The easiest (and cheapest) way to detect a leak in a cooling system is to: Don't use antifreeze, use water. Antifreeze just makes a mess when it leaks out. Dry every thing off Take off the "radiator" cap and fill the engine with water. Put the cap back on loosely, don't lock it but make sure it can't fall off too. Start the engine and let it run for 3-4 minutes. Stop the engine. Remove the radiator cap and refill the engine with water. Replace the cap and lock it this time. Start the engine and start looking for a leak. As the pressure builds up in the cooling system the leak will become more and more obvious. You may be able find it by just poring water into the "radiator cap" opening. Look at all sides of the engine. If the overheat alarm goes off before you find the leak shut the engine down of course. Let the engine cool BEFORE opening the cap and refilling with water. Once you have found the leak and repaired it, drain the engine and refill with a 50-50% mix of antifreeze-water. You can also get radiator pressure testers from the auto parts store that will allow you to replace your radiator cap with a pump so you don't have to run the engine to build up pressure in the cooling system.
If the coolant overflow tank is empty you have a problem. The easiest (and cheapest) way to detect a leak in a cooling system is to: Don't use antifreeze, use water. Antifreeze just makes a mess when it leaks out. Dry every thing off Take off the "radiator" cap and fill the engine with water. Put the cap back on loosely, don't lock it but make sure it can't fall off too. Start the engine and let it run for 3-4 minutes. Stop the engine. Remove the radiator cap and refill the engine with water. Replace the cap and lock it this time. Start the engine and start looking for a leak. As the pressure builds up in the cooling system the leak will become more and more obvious. You may be able find it by just poring water into the "radiator cap" opening. Look at all sides of the engine. If the overheat alarm goes off before you find the leak shut the engine down of course. Let the engine cool BEFORE opening the cap and refilling with water. Once you have found the leak and repaired it, drain the engine and refill with a 50-50% mix of antifreeze-water. You can also get radiator pressure testers from the auto parts store that will allow you to replace your radiator cap with a pump so you don't have to run the engine to build up pressure in the cooling system.
You obviously have a leak....
start by tightening everything, drying off everything, refilling and then sitting by the running engine and warching with a flashlight and a paper towel. Be careful.
start by tightening everything, drying off everything, refilling and then sitting by the running engine and warching with a flashlight and a paper towel. Be careful.
Thanks,
The boat is in transit and should arrive on Monday next week. I will give those suggestions a try and do some further investigating. Thanks to all who replied!
The boat is in transit and should arrive on Monday next week. I will give those suggestions a try and do some further investigating. Thanks to all who replied!
One other leak area to consider
I had a coolant leak in the bilge and I was able to trace the source to the boat's hot water heater via the heater hoses on the engine under the cabin sole (hard place to get to). To detect, I disconnected the heater hose to the hot water heater and looped it back to the return on the engine. No more coolant in the bilge. just a thought. Dan
I had a coolant leak in the bilge and I was able to trace the source to the boat's hot water heater via the heater hoses on the engine under the cabin sole (hard place to get to). To detect, I disconnected the heater hose to the hot water heater and looped it back to the return on the engine. No more coolant in the bilge. just a thought. Dan
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