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Old 07-30-2020, 04:09 PM   #1
Willyt
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Default 2002 Friendship

What is the best way to get to thermostat on the 7.5 diesel generator? Gen does not slide out. Is there a way to get to it without pulling generator. Have done all maintenance, filters, spark arrestor, changed out antifreeze. It has 450 hrs on it. Started it today, it ran for about 45 min with one ac on and quit, it hasn't been reliable. The thermostat is the only thing I haven't replaced
Any help would be appreciated.
Thank you, Tom
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Old 08-09-2020, 10:12 AM   #2
jimcox
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Hi Tom.

I have an ONAN 7.5 generator which blew a fan belt. I had to remove the generator to fix it. I also replaced hoses, thermostat and sensors while i had it open to avoid one of those going in the future. The thermostat is at the very top of the engine and you will have to drop the generator to get at it.

If you plan on doing this yourself, here is a link to how I went about it.
https://www.gsowners.com/forums/show...move+generator

Good luck with whatever you decide

Jim Cox
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Old 08-09-2020, 08:06 PM   #3
Larry8146
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Would you please send me pictures
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Old 08-11-2020, 03:20 PM   #4
jimcox
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Default Generator photos

Hi Larry8146.

Some of the generator photos attached as requested. In img_3009_2, there is a red arrow which points to the thermostat housing. The thermal sensor is in the housing on the opposite side.

The engine is a 3 cylinder Kubota tractor engine.

Jim Cox
Attached Images
File Type: jpg IMG_2996.jpg (174.6 KB, 1 views)
File Type: jpg IMG_3004.jpg (122.6 KB, 1 views)
File Type: jpg IMG_3009_2.jpg (168.1 KB, 5 views)
File Type: jpg IMG_3005.jpg (200.5 KB, 0 views)
File Type: jpg IMG_3008.jpg (199.6 KB, 1 views)
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Old 08-14-2020, 05:58 PM   #5
Willyt
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Thanks Jim good idea using the levelers, what two brushes are you suppose to replace ? Thanks. Tom
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Old 08-14-2020, 06:25 PM   #6
jimcox
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I did not replace the brushes. BIG Shasta had his done and I assume he meant the brushes on the generator itself
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Old 08-18-2020, 09:30 PM   #7
Willyt
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Thanks Jim, I'm going to give this a try....
This isn't my idea, but it makes sense, I was reading this guys forum and he is adamant that the 7.5 Onan generator's dip stick is not marked correctly and when it's reading full it's too full without any room for oil expansion. He said he was having issues with his gen cutting off after it ran for a while. Eventually he withdrew a pint of oil which took it down to the quarter full mark. He said it ran for thirty some hours after that whith no issues. I'm going to try that, can't hurt !! My diesel mechanic who works on my 7.3 Ford always did tell me not to fill it to full line it will just blow it out somewhere.
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Old 08-19-2020, 10:36 AM   #8
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I hope that works for you.
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Old 08-19-2020, 07:04 PM   #9
Willyt
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I'll let you know Jim
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