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post #31 of 37 Old 05-27-2007
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Sounds like there's a hole or leak in the heat exchanger. That's the only place that you'd likely get anti-freeze in to the raw water side of the system. If there is a leak there, the overflow tank won't do anything, since it isn't overflowing...it's just leaking out.

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post #32 of 37 Old 05-27-2007
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Keith...did the mechanic remove your heat exchanger and look for those pieces of impeller blades? I believe you have a corrosion problem in your heat exchanger and given the anti-freeze in your exhaust it may need to be replaced as this is the likely place for exhaust water and antifreeze to meet. At the very least, the heat exchanger should be removed and pressure tested and reamed out. Is there a pencil zinc on the heat exchanger....and has it been changed out...what shape was the old one in?

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post #33 of 37 Old 05-27-2007 Thread Starter
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thanks all, i will take the heat exchanger out again this week and have it retested. the first time we took it out there was not a leak, but they didnt pressure test it. also there were bits of impeller there the first time that were removed, which i originally thought was the problem. i was thinking, the problem really only seems to be an issue when the rpms start to get higher...i m guessing thats logical as the more pressure in the system, the more water is being forced out by the leak?
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post #34 of 37 Old 05-27-2007 Thread Starter
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one other question, am i correct in believing that when we saw the coolant come out of the exhaust, that this was a pretty good clue? meaning coolant should never come out of the exhaust right? cheers
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post #35 of 37 Old 05-27-2007
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Right...you should never see coolant coming out the exhaust.

There are several other possibilities where fresh (circulating) water can be mixed with the raw cooling water which goes through your exhaust, but let's hope it's just the heat exchanger. These are easy to change and relatively inexpensive :-)

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post #36 of 37 Old 05-28-2007 Thread Starter
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thanks for that. i will keep you updated
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post #37 of 37 Old 05-29-2007
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to make you feel good,I operate several boats , my Kubota has operated in all areas from georgian bay to florida since 1973 and is still going good, but remember when it changes its tune ,check it right away it is talking to you..
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