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Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Discussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.
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Topic author United States of America
tonyiiiafl
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Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby tonyiiiafl » August 1st, 2020, 11:14 am

Spent ANOTHER day in the bilge with the Kohler 6.5CZ9I MUST mention that the CZ is different from the others! I have bought parts for the 6.5GZ and they are different!) I have been looking for a governor spring forever, as they are NLA. However I found 3, and now own them. Genset was hunting all over and surging. I should have replaced the spring when I had the starter out, but it was not a bad replacement if you have the right tools, long nosed pliers and fingers you dont mind cutting. I went to replace the heat sensors, but of coursee different as they were for the GZ. (If anyone need a couple I will make a deal on them!) SO I removed the old ones and cleaned up with a wire brush so ther is good clean contact. Next the 20UF capacitor was replaced with the upgraded 25UF. Started her up and bingo. RPMS were WAY high as the new spring was tighter, putting out 135VAC and spinning at 3800. Factory states 3600 under load, and 3750 with no load to hit 60 cycles. EASY governor adjustment to dial in at 3600. SO far, she is running smooth, no surging and has not done the shut off thing as it was doing. Here are a few photos of my (so far) success.
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Topic author United States of America
tonyiiiafl
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby tonyiiiafl » August 1st, 2020, 11:21 am

Had a video but couldn’t figure out how to upload it. SMOOTH as can be. 30 minutes now.
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RGrew176
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby RGrew176 » August 1st, 2020, 12:34 pm

Looks like you have solved your issue. Glad things finally worked out in your favor. Thanks for sharing the solution. The next guy with the same issue at least has a starting point. Now hopefully you can get some new adventures aboard to post about.
Rick Grew

1981 Carver 3007 Aft Cabin

2004 Past Commodore
West River Yacht & Cruising Club
www.wrycc.com
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Topic author United States of America
tonyiiiafl
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby tonyiiiafl » August 1st, 2020, 12:53 pm

Thanks! I do think it was a combination of the capacitor and also the temp sensors. There was a lot of corrosion underneath them that would impeded a good reading. We shall see. Going to try it again tonight for an hour while at the slip.
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby bud37 » August 1st, 2020, 7:05 pm

Tony , you are going to be the, "go to guy", for these gennies when this is all over.....good job man, way to pick your way thru it all.... :down:
"There is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame, The Wind in the Willows

Safe travels with light winds and calm seas.....

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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby Viper » August 1st, 2020, 8:03 pm

Nice going Tony and thanks for keeping us in the loop :clap: :down:
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Topic author United States of America
tonyiiiafl
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby tonyiiiafl » August 2nd, 2020, 8:01 am

I was always one to be “baptized b y fire” and this one I was. I wrote on paper a flow chart of what would cause a shutdown, and also what would relate to non energization, and methodically followed it through. I had my mechanics all over the board with this one. At $115.00/hour it would have gotten ugly for sure plus parts. I try and not be a parts replacer but a trouble shooter. Thanks for all the support and letting me put my thoughts here, as it helped with the troubleshooting process.
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mjk1040
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby mjk1040 » August 2nd, 2020, 8:44 am

U the genny man! :beergood:
Mike :down:
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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Topic author United States of America
tonyiiiafl
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby tonyiiiafl » August 2nd, 2020, 9:14 am

LOL, by default! Thank you.
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Re: Kohler 6.5CZ...Final chapter (HOPEFULLY!)

Postby KeithS » August 3rd, 2020, 2:59 pm

Great Job! You realize of course that this is hardly the final chapter, the generator will think of something else for you. Your generator mechanic rate might be a little low, our rate is $150 per hour, more important it is hard to find someone willing to work on a 20+ year old, discontinued generator that has many parts NLA. So it is good to learn a little about it for yourself. The best way to be sure to get the correct parts is to look for the Spec # on your serial number tag. That refers to the way the generator was built at the factory as different boat manufacturers wanted different equipment.

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