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kohler 7.3 impeller change
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mjk1040
- Admiral
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Re: kohler 7.3 impeller change
CaptBob; Your assumption of an air pocket in the antifreeze size will definitely give you an overheat issue. Even though you bleed the system through the bleeder plug, I think you have to be sure the unit was at thermostat temp. so it was open and you are bleeding the entire system and not just the bypass side of the system. Hope you remember the trick! Mike
Mike 
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
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Viper
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Re: kohler 7.3 impeller change
I agree with Mike. Run her under load.
How have you confirmed she is shutting down due to temperature? How long will she run before shutting down?
How have you confirmed she is shutting down due to temperature? How long will she run before shutting down?
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CaptBob
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Re: kohler 7.3 impeller change
The trick may just be plain persistence.
Yup, ran it under load, had it shut down after about 6-8 minutes (under load, both AC units on) Manifold temp was hotter to touch than heat exchanger. Checked AF, low at the cap side. removed the bleeder plug, filled the cap, squeezed the far hose (opposite the service (oil filter) side) and burped out some air. Burped some more with the hose and slammed the plug home while mid squeeze. (the hose on the service side has a coil spring in it, and cannot squeeze it.... but the other, squeeze away) released the hose, made sure the overflow hose was deep in the over flow tank, Hosed off the mess and fired it up. Ran at the dock for about 20 minutes under load, no shutoff. Went for a cruise, and hour or so up the river, up on plane for a bit of it (filled up the fuel tanks yesterday! )cruised back, anchored, ran continuously for about 4 hours.
I think it's fixed!
Yup, ran it under load, had it shut down after about 6-8 minutes (under load, both AC units on) Manifold temp was hotter to touch than heat exchanger. Checked AF, low at the cap side. removed the bleeder plug, filled the cap, squeezed the far hose (opposite the service (oil filter) side) and burped out some air. Burped some more with the hose and slammed the plug home while mid squeeze. (the hose on the service side has a coil spring in it, and cannot squeeze it.... but the other, squeeze away) released the hose, made sure the overflow hose was deep in the over flow tank, Hosed off the mess and fired it up. Ran at the dock for about 20 minutes under load, no shutoff. Went for a cruise, and hour or so up the river, up on plane for a bit of it (filled up the fuel tanks yesterday! )cruised back, anchored, ran continuously for about 4 hours.
I think it's fixed!
Capt Bob!
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More Nautiville 2004 Carver 360 Sport Sedan
A little less Nauti 2008 SeaDoo 150 Speedster (Admiral could not live without a jet boat....
)Nautiville 2005 Cruisers 280 CXi *Sold*
Nautitown 2012 SeaDoo 180 SP *Sold*
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bud37
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Re: kohler 7.3 impeller change
Heres a couple pics of the pump, interesting is how they are sealing the back of the pump to the rotation with the spring loaded seal. 
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FWIW.....The above is just my opinion..... 
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mjk1040
- Admiral
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Re: kohler 7.3 impeller change
Yep damn air locked again. Close the system and give us more head aches! Had the same problem with vehicles. Mike
Mike
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
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