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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #1  
Old 10-13-2018
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Default ONAN 6.5NH-3CR/12894D Is dead again!

This time it is an oil leak at the rear crank shaft. It looks like a full rebuild will be needed?
What to do now? Buy a new gas GEN, rebuild, install a different GEN?
I have been fixing this GEN for 3 years now.
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Old 01-01-2019
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I hope this is it!
Replaced the crank shaft seals, cleaned and painted the GEN, ran it in the shop, ran good!
Installed it in the bus and can not keep it running. I removed the choke and worked on it on the bench. Using the heat gun tested the bi metal V shaped spring and the coil to see how the thing works. The spring was sprung so I bent it back to get it to work, testing in the shop. Installed it and adjusted the chock rod, and setting the butterfly so it starts right up. It was about 35*F and works great now!!

Hind sight: I should of rebuilt the complete GEN right from the start, but I never worked on one before! Now I know how to fix it!
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  #3  
Old 01-04-2019
Orvie6574 Orvie6574 is offline
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I know what you mean, took me awhile to get mine running right, now it works great, my son has a 76 31 footer, and he's been having issues with his, keeping it running, and sometimes over voltage
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  #4  
Old 07-30-2019
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RUNNING THE gen FOR a/c . It was about 100*F and the GEN ran for about 2 Hrs. then stopped ( A # of times). The only sensor is the oil psi, SO is the oil getting too hot?

Can I run a oil pump and cooler? I am using 15W40 oil (same as the Cat). Not sure what to test.
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  #5  
Old 07-30-2019
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What generator do you have? Never heard of a oil temp shut down sender. If its oil pressure, change the oil to a straight 40 weight. Might be better for the genny anyway.
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  #6  
Old 07-30-2019
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change the oil!
Remember,that engine is oil cooled,not air cooled.
I would add a fan in the genny bay,keep it cool,heat kills,
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  #7  
Old 07-30-2019
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Quote:
Originally Posted by 78bbird View Post
RUNNING THE gen FOR a/c . It was about 100*F and the GEN ran for about 2 Hrs. then stopped ( A # of times). The only sensor is the oil psi, SO is the oil getting too hot?

Can I run a oil pump and cooler? I am using 15W40 oil (same as the Cat). Not sure what to test.
What generator(model) ?

Usual if one of the senders, overtemp switch’s or no oil pressure the fault breaker would pop and need to be reset.
Do you have gauges on it to see if something loooked off. Lots of things could cause it to shut down.
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  #8  
Old 07-30-2019
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Does it have spark?
Does it have fuel?
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  #9  
Old 07-30-2019
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People keep asking "What Model"

The title of the thread is" ONAN 6.5NH-3CR/12894D Is dead again!"

That should answer the question
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Old 07-30-2019
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I had an NH 6.5Kw Onan (Spec P was an important part of its designation, does yours have a Spec id?). That was one of the most straight-forward motors I ever owned. The Onan factory manuals covered it all with step procedures for everything from tuneups to gen freq adjustment, wiring for 120V or 240V--its a great 4-booklet set. It had a low-oil sensor--if triggered by low oil, it stopped the motor. It had a governor that took a few tries to get right. It had a few springs to be be concerned with (that bimetal choke spring you mentioned is a good example). With those things sorted out according to the manual, most run problems came down to the fuel filter, carb, and bad gas. Get the right heat range for spark plug. Rebuild the carb--I'm sure you've been there already with the soaks and carb cleaner. The other gotcha was the glass fuses. This was 15 years ago so the exact problem wire is lost in CRS, but the Onan would stop at random times while I drove down the road. I think it might have been an ignition wire shorting in a box or enclosed space near the points? Wish I remembered better. Went thru a LOT of glass fuses looking for the short. But a real good genset to own and use, if you ask me.
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