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Old 09-13-2015, 02:27 PM   #21
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Originally Posted by cardude01 View Post
Ok. I didn't think it sounded good to let it sit in there.

My Yanmar heats up at anything over about 2400-2500 rpm. At WOT of 3200 it gets to 200 pretty quickly.

At under 2400 it runs about 180-185.

That is just about where I was at with the over heating problem. I really believe you will be happy with your flushing efforts. I even had removed my core and physically touched and scraped at the scale. But I couldn't find an acid bath to remove it. After taking with the Napa folks I reassembled the HE and did the flush treatment. Talk about taking the hard way around a problem to get to the solution. But that's me. Anyway the end result was worth the journey. I just try and save others some frustrating steps.
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Old 09-13-2015, 02:31 PM   #22
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Originally Posted by cardude01 View Post
Ok. I didn't think it sounded good to let it sit in there.

My Yanmar heats up at anything over about 2400-2500 rpm. At WOT of 3200 it gets to 200 pretty quickly.

At under 2400 it runs about 180-185.
You are or have taking the heat exchange tubing bundle out to clean it correct? If so, the condition of the outer tube bundle will tell you if you really need to run coolant flush through the engine. Although doing it for one reason or another cant hurt anything.
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Old 09-13-2015, 04:16 PM   #23
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Originally Posted by Pgitug View Post
That is just about where I was at with the over heating problem. I really believe you will be happy with your flushing efforts. I even had removed my core and physically touched and scraped at the scale. But I couldn't find an acid bath to remove it. After taking with the Napa folks I reassembled the HE and did the flush treatment. Talk about taking the hard way around a problem to get to the solution. But that's me. Anyway the end result was worth the journey. I just try and save others some frustrating steps.
Thank you!
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