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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan 4.0 BFA Project


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  #11  
Old 09-01-2017, 06:04:46 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 4.0 BFA project

Looking for the carb that I need, 146-0419, I have found prices from $250 - $350. These old parts sure bring a high price! Oh well, the final outcome will be worth it.

Question on the choke assembly, any idea if there is a part number for the whole set up? I looked at the parts break down and it looks like each piece is separate. Guess I will be on a parts hunt.
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  #12  
Old 09-01-2017, 09:45:25 AM
KPack KPack is offline
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Default Re: Onan 4.0 BFA project

I've got what you need pm me.
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Old 09-01-2017, 05:25:36 PM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 4.0 BFA project

Pm sent.
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  #14  
Old 09-01-2017, 07:27:45 PM
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Default Re: Onan 4.0 BFA project

Sicker then a dog tonight. I will pull the other head and clean it up tomorrow. Then tear into the generator and clean slip rings and chech things out. Going to wire in a couple outlets too so when I can it will be ready to test.
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  #15  
Old 09-02-2017, 07:24:18 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 4.0 BFA project

I know that I am not a smart guy when it comes to these machines but I really don't understand this. For spec A they use a 167-0237 spark plug, after that, they use a 167-0298 spark plug. All the ignition components seem to be the same from what I see on the parts break down. I tried doing a cross reference on the plugs but must be having a brain fart day today with this head cold I got. What is the difference in these plugs and what is a cross reference for them?
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  #16  
Old 09-02-2017, 08:06:01 AM
KPack KPack is offline
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Default Re: Onan 4.0 BFA project

Anybody know if the spec c carb will fit the spec a unit ?

Last edited by KPack; 09-02-2017 at 08:30:06 AM.
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  #17  
Old 09-02-2017, 08:33:21 AM
KPack KPack is offline
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Default Re: Onan 4.0 BFA project

Pictures of the carb.
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  #18  
Old 09-02-2017, 10:48:25 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 4.0 BFA Project

The parts diagram doesn't show a different part number or different adapter.

I tore the other head off and found a stuck open exhaust valve. Thought it was bent because it angles down but looks okay after freeing it up. Pulling the tappet cover there I'd a lot of sludge in the motor. I don't know if they ever got it really warm and worked it good or just short runs. After I get it running will have to do a good oil system flush and a few bottles of intake/carb cleaner. Even the intake valve stems are covered in sludge.
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  #19  
Old 09-02-2017, 10:52:33 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 4.0 BFA Project

Here is the second cylinder. The good news is you can still see the cross hatch.
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  #20  
Old 09-02-2017, 11:12:06 AM
Kevin K Kevin K is offline
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Default Re: Onan 4.0 BFA Project

As long as you have the heads pulled, you might as well remove the valves and give them, and the intake and exhaust ports, a good cleaning. It is something I always do.
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