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Ok...I have a '68 Colvin. Ranger is her name and she has an overheating problem. We bought her and was trying to deliver her ourselves over the Christmas holidays and she overheated on us coming out of the channel headed for open water. We came back to the dock and troubleshot the cooling system and found nothing more than the coolant being a little low. I wasn't aware that there was a fill cap on the heat exchanger. I topped it off and ran the engine for a couple of hours with no worries. I lashed the boat to the dock and put it under a little bit (not very much..maybe 1500-1800 rpms) of a load...no problem. I decided that we did not now have time to take her home ourselves, and hired a captain who is on the boat now trying to bring her to me.
The first day, when faced with a strong current, he bumped her up to about 2000 rpms and she overheated within about 2 minutes. Drop her back to idle and she cools right off. He brought her back to the pier and checked all he could, didn't find anything wrong. We called a mechanic, who came out and looked everything over and they tested the thermostat, checked out the fresh water pump etc...to find nothing obviously wrong. I am getting at least some heat transfer to the exhaust water. The raw water pump is pushing plenty of water. The fresh water pump appears to be ok. The heat exchanger was made by the previous owner, who really seemed to be johnny on the spot when it came to such things.
At the end of the last 24 hours, she has used about a quart of coolant in the freshwater side. Any thoughts as to what is happening here? Is the little bit of loss of coolant the culprit?
The first day, when faced with a strong current, he bumped her up to about 2000 rpms and she overheated within about 2 minutes. Drop her back to idle and she cools right off. He brought her back to the pier and checked all he could, didn't find anything wrong. We called a mechanic, who came out and looked everything over and they tested the thermostat, checked out the fresh water pump etc...to find nothing obviously wrong. I am getting at least some heat transfer to the exhaust water. The raw water pump is pushing plenty of water. The fresh water pump appears to be ok. The heat exchanger was made by the previous owner, who really seemed to be johnny on the spot when it came to such things.
At the end of the last 24 hours, she has used about a quart of coolant in the freshwater side. Any thoughts as to what is happening here? Is the little bit of loss of coolant the culprit?