[AT] Onan Charging system help needed

Sat Jan 28 04:16:52 PST 2006

I worked on the ONAN Yesterday and found that the rectifier was missing, not 
the regulator.  I have 3 wsires coming from the stator..  However, I do not 
have 36 volts AC available.  It is more like 13.  I used a diode bridge and 
attached the negative side of it to the engine block and now have DC, but 
even with putting full voltage on the field, there is only 12.6 volts 
charging.  Probably the stator is bad or something.  I probably will just 
put an old automotive regulator on it and forget the flywheel alternator 
crap..   I spent most of the day on this thing, and it is just too much 
time.

The engine is good in the cylinders, I checked them  The valves are sealing, 
and are adjusted with proper clearance.  However this is a factory engine 
pump combination and the engine will not pump near full volume.   The 
throttle is at the side open position, It is a 2 1/2 x 2 1/2 Gorman Rupp 
pump and it is cut down to 2 inch intake and 1 1/2 outlet, and the engine is 
severely loaded.  It will however run quite well when switched over to the 
fire nozzle at 5/16 diameter and run at 125 lbs.  I got 125 lbs pressure 
after rebuilding the carburetor, installing new points and adjusting, and 
then changing over to H8 plugs...I am running super unleaded.  The only 
thing I have not tried is adjusting the timing by moving the point box...
Cecil in OKla
----- Original Message ----- 
From: "Dudley Rupert" <drupert at premier1.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Saturday, January 28, 2006 2:47 AM
Subject: RE: [AT] Onan Charging system help needed

>
> Cecil,
>
> I have three Simplicity's with each having a CCKB engine and with each
> engine having the Stator charging system.  However, there are two 
> different
> configurations of Rectifiers and Regulators.
>
> One configuration has a discrete Regulator and a discrete Rectifier. 
> Three
> wires come out of the Stator, three come out of the Rectifier and two come
> out of the Regulator.  Two of the three wires coming out of the Stator go 
> to
> the Rectifier and the third Stator wire goes to the Regulator.  The third
> wire coming out of the Rectifier and the second wire coming out of the
> Regulator are tied together and go to the Battery.
>
> The other configuration has a single unit which contains both the 
> Regulator
> and the Rectifier.  In this configuration only two wires come out of the
> Stator and they both go to the Regulator/Rectifier unit.  A third wire
> coming out of the Regulator/Rectifier unit goes to the Battery.
>
> I am not sure I understand your' charging configuration but if it's like
> either described above I would believe as Jeff has said below that you
> should have some Regulator/Rectifier choices other than Onan. 
> Incidentally,
> I love the Simplicity's (9020s) to drive/operate but DETEST them 
> (including
> the Onan engine) to work on ... more than once I've been tempted to load
> them all up and take them to a high cliff somewhere and push them off.
>
> Dudley
> Snohomish, Washington
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com]On Behalf Of JEFFREY PILBEAM
> Sent: Friday, January 27, 2006 6:19 PM
> To: 'Antique tractor email discussion group'
> Subject: RE: [AT] Onan Charging system help needed
>
> EASY one, 2 wires come from the Stator, they should put out approx 30-40
> volts AC @ 3600RPM those 2 wires will then hook to the outer wires of just
> about any std small engine reg-rec. thjen you will be getting about 14v DC
> out of the unit to charge with.
>
>
> Jeff's Jeep Barn
> Britton Mi
> Pilbeam's Centennial Farm
> Tecumseh Mi
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Cecil Bearden
> Sent: Friday, January 27, 2006 8:33 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] Onan Charging system help needed
>
> Larry & others.
>
> I have been working on small engines for fire pumps for the last month.  I
> have 3 ONAN, the old CCKB series that have the internal flywheel type
> alternator.   They use a regulator (3 wires) and a rectifier (2 wires)
> mounted outside.  I am missing the regulator on one and both on the other 
> 2.
> Onan later used a 20 amp regulator on the P series that has 3 connectors.
> My question is has anyone replaced the earlier models with the later model
> regulator.  Since Cummins bought out ONAN, parts for ONAN are ridiculously
> expensive.  The rectifier and regulator boxes are $83 each!!!!!!!  The one 
> I
> want to replace it with would only cost me $20.  I also thought of using 
> an
> old external regulator from a 60's model Chevy.  I am just stumped on this
> one, and I know I should not be...   Can anyone give me a little help???
>
> I found a discussion of ONAN charging systems Here:
> www.simpletractors.com/service/onan_electrics.htm
>
>
>
>
> Cecil in OKla
>
> _______________________________________________
> AT mailing list
> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at
>
> _______________________________________________
> AT mailing list
> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at
>
>
> _______________________________________________
> AT mailing list
> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at 