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Old 07-26-2004, 07:01 PM   #1
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Onan Generator loping

Have '89 Airstream Motorhome with Onan NHE 6.5Kw generator. Generator lopes under load most of the time, but not 100% of time. Manual says to first adjust points. Is that usually what causes this? Points are almost impossible to adjust without removing generator. Any help with this?

Thanks.
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Old 07-26-2004, 07:16 PM   #2
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Generator Question

Hello,

Sounds to me like you should try to adjust your high-speed needle
jet a little each way to see if it makes a difference. Try richer first
and then leaner. Be sure to remember where you started from before
making any turns on the needle jet adjustment. Some motors have a
fixed high-speed and cannnot be adjusted. Galloping or hunting is usually
caused by carb. out of adjustment. Also check your fuel filter to be sure
its not restricting gas flow.

Hope this helps a little ODD
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Old 07-26-2004, 07:27 PM   #3
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Quote:
Originally Posted by noiva
...Onan NHE 6.5Kw generator. Generator lopes under load most of the time..... Manual says to first adjust points. Points are almost impossible to adjust without removing generator.
Check out this thread: http://www.airforums.com/forum...ht=onan+points

Also, do a search for "Onan".... lots of info here.

Points are easy to get to and are inexpensive.

Could be the throttle linkage is sticking, carb out of adjustment (if over 5 or 6 hundred hours, just replace the carb), valves sticking, or a fuel supply problem.

The 370 is indeed rare, I don't think there is another active member here on the Forums with one. Most of us have the Chevy Chassis and the 454. The Gillig chassis with the Ford 460 sounds as if it would be a good match.

How long have you had yours?
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Old 07-26-2004, 09:33 PM   #4
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Onan help

ODD,

Thanks. I am suspicious of the carb adjustments, but the manual doesn't mention them as a cause of galloping. Tomorrow I'll give that a shot. I'll let you know if that does it.

noiva



Quote:
Originally Posted by Orland Dewey
Hello,

Sounds to me like you should try to adjust your high-speed needle
jet a little each way to see if it makes a difference. Try richer first
and then leaner. Be sure to remember where you started from before
making any turns on the needle jet adjustment. Some motors have a
fixed high-speed and cannnot be adjusted. Galloping or hunting is usually
caused by carb. out of adjustment. Also check your fuel filter to be sure
its not restricting gas flow.

Hope this helps a little ODD
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Old 07-26-2004, 09:42 PM   #5
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Onan help

Dennis,

The points appear to be located almost all the way back on the top of the generator. I located the cover today, but couldn't do more because the gen was still hot. I'm not sure how to get to the crank to rotate it for the points to open and allow me to adjust them. Anyway, I'm thinking fuel and/or carb since it doesn't lope all the time. The 370LE is very interesting, but isn't mine quite yet. It belongs to my brother, but I have the luxury of using it for as long as I like to see if I want to buy it from him. (I've always been a trailer hauler). It's like new, 15,000 miles, exterior completely redone by A/S 2 years ago. Everything works, but lack of use is a concern. Systems do better when used, especially when they're as complex as this unit. I'm a little intimidated by the complexity, but I LOVE the motorhome.

noiva

Quote:
Originally Posted by 87MH
Check out this thread: http://www.airforums.com/forum...ht=onan+points

Also, do a search for "Onan".... lots of info here.

Points are easy to get to and are inexpensive.

Could be the throttle linkage is sticking, carb out of adjustment (if over 5 or 6 hundred hours, just replace the carb), valves sticking, or a fuel supply problem.

The 370 is indeed rare, I don't think there is another active member here on the Forums with one. Most of us have the Chevy Chassis and the 454. The Gillig chassis with the Ford 460 sounds as if it would be a good match.

How long have you had yours?
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Old 07-26-2004, 10:13 PM   #6
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Quote:
Originally Posted by noiva
I'm not sure how to get to the crank to rotate it for the points to open and allow me to adjust them.
If you can get at the end of the generator see if there is a bolt in the end of the shaft you can turn it with.

John
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Old 07-26-2004, 10:17 PM   #7
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Replace your generator's fuel filter

Many times the fuel filter will become clogged a little and the generator will operate normally ithout a load, but when a load is applied it will begin loping as you have described.
There is no way to check the fuel filter other than to replace it and see if that solves the problem.
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Old 07-27-2004, 02:57 PM   #8
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New points made mine run smooth. They are cheap and easy to install, at least in my unit. Try it. They're in a box directly on top. Tried to clean them and that only lasted for about an hour and the problem returned. Fresh points much better.
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