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Kohler 7.3 Cooling issue
- 650Guy
- First Mate
- Posts: 196
- Joined: July 11th, 2017, 10:55 pm
- Vessel Info: 2003 Carver 396 Motor Yatch
370 Cummins - Location: Sandusky Ohio
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Kohler 7.3 Cooling issue
* New spark plugs
* New Impeller
* New Impeller coupling
* Oil Filter (did not change oil as I could not warm up the engine, figured I'd do that this year.)
* New Ball Valve, of course.
This year, fired it up and she purred like a kitten... then after about 20 mins shut down. I ASSUME it's overheating, so go to replace the thermostat. Only to find the thermostat is missing the guts! like the top 1/2 is there, but the spring and everything behind is ... well, not there! I have noticed that my reservoir is over full, could that be indication of a blockage??
So now my questions are:
1) Did the previous owner take the guts out?? Ya know, just to not have to worry about overheating issues... Doesn't SEEM like something anyone would do, BUT... Ya never know.
2) if NO, on #1, where could the parts have gone? I used a flexible claw to feel around the entire top manifold and did not find anything.
3) have removed most all hoses and did not find any signs of the parts.
4) Can I just flush the Gen and see if I have flow with no blockage? where would I hook up?
And lastly...
5) if YES, on #1, I can toss in a new thermostat, flush the system BUT...what is causing it to shut down?
Does anyone have any experience with these bad boys? Would love some guidance, as I'm grasping at straws.
- bud37
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Re: Kohler 7.3 Cooling issue
Do the edges look like they corroded away or cut ? Have you used the genny since you have owned the boat ?
Get your ir temp gun and check around.
- mjk1040
- Admiral
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- Vessel Info: 1998 355 AC/MY "Deja Vu"
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Re: Kohler 7.3 Cooling issue
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
- 650Guy
- First Mate
- Posts: 196
- Joined: July 11th, 2017, 10:55 pm
- Vessel Info: 2003 Carver 396 Motor Yatch
370 Cummins - Location: Sandusky Ohio
- Has thanked: 6 times
- Been thanked: 29 times
Re: Kohler 7.3 Cooling issue
Bud 37 -
"Have you used the Gen since you owned the boat" - That answer would be no, During the survey, we ran it and it took a load just fine, then we shut it down. In hind sight, it never ran for more than 5 mins and she seems to run for about 10 or so before it shuts down.
Do the edges look like they corroded away or cut ? - I have included pictures (hopefully)
MKJ1040 - what is a "RydLyme treatment"? I have never done one of those?
-
- CYO Supporter
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- Vessel Info: 1998 Carver 355
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Re: Kohler 7.3 Cooling issue
When its running, how is the water flow out the exhaust? It should have a pretty good flow, about like a garden hose.
- 650Guy
- First Mate
- Posts: 196
- Joined: July 11th, 2017, 10:55 pm
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370 Cummins - Location: Sandusky Ohio
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Re: Kohler 7.3 Cooling issue
- bud37
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Re: Kohler 7.3 Cooling issue
650Guy wrote:Source of the post water flow seems pretty strong... comes out in consistent blobs of water with a steady smaller stream that is continuous. Because last year I had no water, I cannot compare anything, but the impeller and coupler is new as well as the strainer is clean. I'm hopeful that the seawater feed is in good shape.
Regarding your pics...that is how you do it....center out and the ring slows the water down..
I have the same genny and that is just how the exhaust flow is on our boat due to the muffler system they used.
I agree, put a good thermostat back and watch it closely...
-
- CYO Supporter
- Posts: 2290
- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X - Location: upper chesapeake bay
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Re: Kohler 7.3 Cooling issue
- 650Guy
- First Mate
- Posts: 196
- Joined: July 11th, 2017, 10:55 pm
- Vessel Info: 2003 Carver 396 Motor Yatch
370 Cummins - Location: Sandusky Ohio
- Has thanked: 6 times
- Been thanked: 29 times
Re: Kohler 7.3 Cooling issue
- 650Guy
- First Mate
- Posts: 196
- Joined: July 11th, 2017, 10:55 pm
- Vessel Info: 2003 Carver 396 Motor Yatch
370 Cummins - Location: Sandusky Ohio
- Has thanked: 6 times
- Been thanked: 29 times
Re: Kohler 7.3 Cooling issue
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