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Old 29-08-2018, 18:07   #16
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Re: Kohler 5E/4EF 7.3E/6EF Generator Overheating Resolved

don't know if you can see. but i will put the pump in red do you think the flow will go up or down?
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Old 29-08-2018, 18:19   #17
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Re: Kohler 5E/4EF 7.3E/6EF Generator Overheating Resolved

I'm guessing by this pic, where my red is, the flow will go down. right to the factory pump
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Old 02-09-2018, 09:11   #18
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Re: Kohler 5E/4EF 7.3E/6EF Generator Overheating Resolved

Ok. I fixed it. The first thing I tried was putting that pump in line. It was a coolant auxiliary pump out of a caddy. Flow was very noticeable now . But it still overheated. It is as though the heat exchanger isn't doing a good job. Maybe from rust. There's nothing clogging it. So I took the hose from the fresh water pump and connected it where my factory coolant pump is and took the line that used to supply the factory pump and ran that to where it cools the exhaust.and exits out the side of the boat. And now it works fine. I use my boat on a lake it's no longer a closed loop system. And works like a charm
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Old 02-09-2018, 11:13   #19
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Re: Kohler 5E/4EF 7.3E/6EF Generator Overheating Resolved

So you fixed it by bypassing the heat exchanger?
Id pull the heat ex and fix it myself, I would want antifreeze, not lake water circulating
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Old 22-05-2020, 17:36   #20
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Re: Kohler 5E/4EF 7.3E/6EF Generator Overheating Resolved

i wonder if you actually need thermostat in a fresh lake gen
mine is filling overflow tank when it starts and then shuts down.
could the thermostat not be opening causing it to not have any circulation
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Old 23-05-2020, 00:54   #21
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Re: Kohler 5E/4EF 7.3E/6EF Generator Overheating Resolved

Have you also bypassed the heat exchanger?
You need a functioning thermostat..... unless the lake is at engine operating temperature. It takes at least 10 psi in the coolant system to pop the top tank cap and fill the expansion tank so unless your cap is leaking there is a problem. If the thermostat has failed, it most likely has failed closed and the only circulation will be via the bypass port and a reasonably quick overheat would occur, blow the cap and fill the expansion tank.
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