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| H180 4.3L Overheating problem. NEED HELP!! https://www.smwebhead.com/phpBB3/viewtopic.php?f=3&t=5678 |
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| Author: | tjlowery [ Sun May 23, 2010 9:10 pm ] |
| Post subject: | H180 4.3L Overheating problem. NEED HELP!! |
Hey all, I am hoping that you guys can help me out. I recently purchased a 1989 H180 and have been having an issue with the boat overheating. I replaced the impeller, and it worked fine on muffs. I did the check to make sure that it was getting 4-6" of water when the engine was started. It did and everything seemed fine. The engine water pump is pumping and when running on the muffs everything is fine. However when I put it into the lake and try to run it, within a few min the temp rises and it begins to overheat. Today while sitting in the lake I pulled the raw water inlet and realized that it was not pumping water, i pulled the upper drive cover to inspect it and realized that there were bubbles coming from where the impeller pump vent line connects to the lower unit. I tried running it with the vent line disconnected with the same results. Nothing!! It still overheats. Any ideas what could be causing this? I have back-flushed the system from the t-stat to the impeller, no pieces where present, and there were no clogs. Could the culprit be a faulty impeller? Possibly the seal between the upper and lower units? If so, how do I check which is causing this? Please help, I have been back and forth to the lake everyday, and I don't seem to be any closer to fixing it. Thanks, [b][/b] |
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