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Onan W2S, Carburetor Needed


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  #11  
Old 11-12-2017, 12:25:11 AM
DPehrson DPehrson is offline
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Default Re: Onan W2S, Carburetor Needed

John Newman, Jr.

I am very interested in the carburetor that you have available that you feel will work on my generator. How best can we make arrangements for the purchase thereof?

Much appreciated!!!
Dave
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  #12  
Old 12-08-2017, 11:10:08 AM
DPehrson DPehrson is offline
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Default Re: Onan W2S, Carburetor Needed

Thank you John Newman Jr. For going out of your way and providing an original zenith carburetor for this genset.
As previously stated, this particular carburetor is position adjustable. I have attached a few pictures to indicate.
I have not yet installed this carburetor, but plan to do so in the next little while and will keep everybody updated on progression.

I do have another question concerning this particular genset though...
When I first purchased it from the salvage yard, it would easily crank and start by pressing the start button, with a fully charged 12 volt battery. However, now it will not crank at all on its own with the battery. If I press the start button and give the cooling fan a little push it will begin to rotate under battery power and start, which is a very unsafe practice. Otherwise, in order to start it, I must hand crank it . If I pull the spark plugs out, it will crank under the power of the battery, but will not crank under compression with the plugs in. What are your recommendations on this situation?
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  #13  
Old 12-08-2017, 02:10:43 PM
RETCPO RETCPO is offline
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Default Re: Onan W2S, Carburetor Needed

Exciter cranked?
If yes
1) check the all brushes are free in there holders
2) clean slip rings and segments
3) check ALL battery connection points
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  #14  
Old 12-08-2017, 05:44:43 PM
Wayne 440 Wayne 440 is offline
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Default Re: Onan W2S, Carburetor Needed

Quote:
Originally Posted by RETCPO View Post
Exciter cranked?
If yes
1) check the all brushes are free in there holders
2) clean slip rings and segments
3) check ALL battery connection points
Plus- the condition of the battery. "Fully charged" does not always mean "capable of delivering rated current".
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  #15  
Old 12-09-2017, 11:32:15 PM
DPehrson DPehrson is offline
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Default Re: Onan W2S, Carburetor Needed

Thank you for replys on cranking suggestions.

Yes, It is 'Exciter Cranked'...
Concerning the brush holders, slip-rings and segments... I am not experienced with generator design or technical language, so I will need to learn. Are those componants all accessible by removing the housing and support at the rear most of this particular model generator? (see attached picture). ...or do I need to go deeper into the center/front of the generator to reach these components? This may be a very naive and 'should-know-it-if-you-own-a-vintage-generator' type of question, but I'm on a learning curve right now.

Excellent point on the battery being 'capable of delivering the FULL CURRENT needed to crank the 'loaded' exciter. I will get a known good battery on this and ensure appropriate current delivery.

Thank you, Dave
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  #16  
Old 12-10-2017, 02:46:33 AM
AngrySailor AngrySailor is offline
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Default Re: Onan W2S, Carburetor Needed

The the brushes and slip rings are accessible just behind the end bell, check the bearing and grease it while you're in there. If you have a volt meter, place it on your battery while cranking. If it drops anywhere near 10v the battery doesn't have enough cranking amps.
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Old 12-10-2017, 09:35:40 AM
YellowLister YellowLister is offline
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Default Re: Onan W2S, Carburetor Needed

Inside the control box there is a big old *relay* that is pretty much a big set of points that all the current passes through when the start button is pushed and coil is energized and pulls the points In to make contact

Those *points* may need a good cleaning as mine does every 6 months or so
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  #18  
Old 12-11-2017, 12:35:44 AM
DPehrson DPehrson is offline
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Default Re: Onan W2S, Carburetor Needed

Ok. Thanks for the troubleshooting recommendations.

I learned that the solid slip 'rings' of the armature are for the transfer of AC current to the brushes and the multiple metal contact 'segments' (segmented rings) or commutator on the armature are for the transfer of DC current... hope that's correct.

I took the outer bell cover off and discovered a rear frame that supports the rear of the armature via the bearing mentioned. Can I easily remove that frame/bearing support in order to ease access to clean the slip rings and commutator?... or do you recommend just reaching in and doing the cleaning with frame in place? I can fairly easily reach and unload the brushes and back them off in order to remove the frame?

I will assume that the bearing is of the bronze insert type and standard grease via a grease zerk is all that is needed to lube it.

The brush springs are all fine. The brushes all move freely in their respective guides and the brushes have plenty of meat left on them.

...still need to clean the control box solenoid contact points.

Thanks to all, Dave
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  #19  
Old 12-11-2017, 01:28:31 AM
AngrySailor AngrySailor is offline
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Default Re: Onan W2S, Carburetor Needed

Don't remove the bearing support. Lift the brushes from their holder and reach in to clean the slip rings. The bearing is a ball bearing, I think there is a slotted screw plug on the bearing support, push some grease in there or some thick gear oil. If the bearing is dry. Wash it out with wd-40 then grease/oil it.

Here is the wiring schematic for your machine in case you have further start issues.
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  #20  
Old 12-11-2017, 11:06:05 AM
DPehrson DPehrson is offline
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Default Re: Onan W2S, Carburetor Needed

AngrySailor,
Thank you for the above and beyond information, which I need and very much appreciate! Yes, there is a slotted plug on one side of that bearing mount. I will do as you have recommended.
Do you have a recommendation on the type of solution or chemical to use in order to clean the slip rings and segments? I have some electronic contact cleaner, will if that work ? I remember reading somewhere to use 600 or 1000 grit Emery cloth to clean up the copper surfaces of the Rings and segments, does that sound correct to you?
Again, I am much indebted to you for you're helpful knowledge, experience and recommendations. Dave
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