I recently posted a description of my recent problems with my Yanmar 3gm30f overheating. I went to the boat today and did some checking. I went to pull out the cooling tube to clean it when I discovered a part of an impeller in the hose running from the raw water pump to the cooling tubes. I could not remove the cooling tube. I cleaned out the tubes by removing the covers at both ends and using a gun cleaning kit and CLR. I also cleaned out the mixing elbow with a wire brush. Any suggestions as to how to get the stuck cooling tube out? And, is it needed since I cleaned it as described? By the way the hoses going from the raw water inlet to the strainer and from the strainer were just put in a few months ago (in reply to Sam's suggestion). Again thanks for everyones help.
engine overheating
- Thread starter jim22335
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cleaning tubes
I think you found your problem. You likely had restricted flow due to pieces of impellers in the hose. How it got to break should be your next concern... was it old? Did it run dry, etc. Cleaning the inside of the tubes is one part. When I cleaned mine, most of the calcium was on the outside of the little tubes. I don't remember how the assembly comes out exactly. I have a service manual on the boat which I would need to check. Seems to me you just remove the two covers ( at each end) and push the assembly out, which look like a big cylinder with little tubes inside. The big cylinder has big holes and this is where the Cleaning fluid can be inserted. Slosh it around and big flakes should come out.
I think you found your problem. You likely had restricted flow due to pieces of impellers in the hose. How it got to break should be your next concern... was it old? Did it run dry, etc. Cleaning the inside of the tubes is one part. When I cleaned mine, most of the calcium was on the outside of the little tubes. I don't remember how the assembly comes out exactly. I have a service manual on the boat which I would need to check. Seems to me you just remove the two covers ( at each end) and push the assembly out, which look like a big cylinder with little tubes inside. The big cylinder has big holes and this is where the Cleaning fluid can be inserted. Slosh it around and big flakes should come out.
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