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Tractor Talk Discussion Forum

Craftsman /onan 18 hp

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Wm in Emerson

12-28-2004 16:51:40




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Can someone explain to me what function( EXACTLY) a regulator/rectifier on an Onan 18hp plays.
Will the engine crank if it is bad? If not can you bypass it and how do you bypass it?

Also someone posted a website where you could download a rebuild/parts breakdown manual in the past . Does anyone know of this site?

Thanks Bob in Ga




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Wm in Emerson

01-01-2005 18:35:54




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 Re: Craftsman /onan 18 hp in reply to Wm in Emerson, 12-28-2004 16:51:40  
Hi Bob,

I guess it is a matter of Demographics. I crank my engine therefore I start my engine LOL.

This unit has only one ignition system and has points and condensor/capacitor. My problem is no fire. I replaced the coil,points and condensor and still no fire. I also checked both compression and exaust and both were sufficient.Still no fire.

Any suggestions?
Wm/Bob in Emerson



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Bob

12-28-2004 17:29:15




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 Re: Craftsman /onan 18 hp in reply to Wm in Emerson, 12-28-2004 16:51:40  
The regulator/rectifier takes A/C current produced by the permanent-magnet alternator under the flywheel, and rectifies it to DC, and holds the voltage doen to the correct level for proper charging of the battery. This happens while the engine is RUNNING.

It has nothing whatever to do with "cranking" or actually, as I assume you mean starting.

(I wish people would be more clear..., as in "cranking" means the engine is rotating, by means of the starter (hand or electric), and starting meaning just what it says!)

The engine should start with the regulator/rectifier unplugged but there would be no recharging of the battery.

Now, if your engine has no breaker points, and the "box" you are talking about is part of the igntion system, that is another matter. I believe some Onans have as many as 2 ignition modules, and they are proprietary (read expensive).

For good advice, post the numbers on the engine tag over at the forum at www.perr.com. There's a couple of real knowledgeable Onan guys over there.

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