Governors operate in a state of balance, like a teeter totter. Mechanical
force from a centrifugal device driven by the running engine vs a spring.
When the engine is not running, the spring overwhelms the linkage, and the
throttle appears to be wide open, or in some cases, fully closed. BUT, when
the engine runs, the linkage moves the throttle to a pre-determined
position to control the voltage, AS WELL AS THE FREQUENCY, of the
generator. If you grab hold of the linkage and pull against the effort of
the governor, bad stuff is going to happen if the generator is actively
producing electricity. Some modern electronic devices really, really don't
like excessive voltage or frequency. You will let the captive smoke out of
them, and they will cease functioning. Just sayin'.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
> Yes it is the governor. At stop position the governor butterfly is wide
> open, when Onan is running the governor butterfly is mostly closed and
> positioned against a stop, adjustable by an idle screw.
>
> On Sun, Sep 23, 2018 at 6:20 AM Steve Southworth
>
> > > Trying to get a 4k Onan to run. Onan had been idle for12 years or
> > longer. Replaced the fuel pump, k-1 solenoid, control board, cleaned, and
> > lubed
> > > starter, lubed starter solenoid, points at .020". Have spark to both
> > plugs. I can get the Onan to run when cranking starter but I have to
> > manually
> > > close the governor. What pulls the governor closed when first starting
> > the Onan? Have tried different settings on the spring and adjusting nut
> to
> > > no use.
> >
> >
> >
> > I'm confused. You say "governor" but seem to be describing the choke
> > operation. The governor controls the throttle linkage. If it is truly
> the
> > governor then it is a much different problem to solve. The Governor, its
> > linkage and the actual internal governor system, should be pulling the
> > throttle open.
> >
> > The choke, when cold and not running should be approximately 1/2 closed.
> > The choke actuator has two internal components. One is the typical
> thermal
> > bi metallic spring. When cold this pulls the choke half way closed. The
> > other component is an electric solenoid. This solenoid is energized when
> > the starter cranks and pulls the choke the rest of the way closed. With
> > the starter not running and the engine hot the choke should be completely
> > open.
> >
> > The choke actuator is grounded through the exhause manifold. This
> > connection frequently is, as stated earlier, rusted and will not allow
> the
> > current
> > to flow. You can clean the rust however it will rust again and cause the
> > same problem. Best solution is to run a ground wire from the choke
> actuator
> > mounting bolt to a better ground. If the choke actuator solenoid does
> not
> > work all is not lost as there are some fixes that may work to correct
> this.
> > I don't believe there is a choke actuator replacement available. (I
> > replaced mine with a NOS OEM but it was pricey. I got lucky and saw it
> on
> > eBay
> > as soon as it was posted and did the "buy it now" thing.)
> >
> > --
> > Steve Southworth
> > 1974 Glacier TZE064V100150 (for workin on)
> > 1975 Transmode TZE365V100394 (parts & spares)
> > Palmyra WI
> >
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>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
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