| Onan 6000 Choke question [message #117481] |
Fri, 04 March 2011 08:53  |
Fatmans Garage
Messages: 3
Registered: March 2011
Location: FT Wayne, IN
Karma: 0
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Junior Member |
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Good Morning, we just acquired a 74 GMC MH, I believe it is an "Executive" Model. 26'. It has the Onan 6000 and has been boogered with a bit. In trying to get everything back together correctly, the one big issue we seem to be having is that the automatic choke will not release after warming up. Has anyone else experienced this and how did you address it. Thank you in advance.
John
www.fatmansgarage.com
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| Re: [GMCnet] Onan 6000 Choke question [message #117495 is a reply to message #117481] |
Fri, 04 March 2011 09:42  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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John, there is a thermostatic coil spring that expands when warmed up by the
exhaust to mechanically open the choke. If the circuit board is still
applying voltage to the pull in coil after the starter is released,
sometimes the spring isn't powerful enough to overcome it. Check it with a
test light while the engine is running to verify.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Fri, Mar 4, 2011 at 6:53 AM, John Snyder <john@fatmansgarage.com> wrote:
>
>
> Good Morning, we just acquired a 74 GMC MH, I believe it is an "Executive"
> Model. 26'. It has the Onan 6000 and has been boogered with a bit. In trying
> to get everything back together correctly, the one big issue we seem to be
> having is that the automatic choke will not release after warming up. Has
> anyone else experienced this and how did you address it. Thank you in
> advance.
>
> John
>
> www.fatmansgarage.com
>
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Onan 6000 Choke question [message #117582 is a reply to message #117522] |
Fri, 04 March 2011 20:26 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| James Hupy wrote on Fri, 04 March 2011 11:19 |
John, I believe that the choke circuit is energized with the starter circuit
so that when it is cranking, the choke is applied and when the starter motor
is disengaged, the power to the choke is either on a timed delay or off.
|
The way I understand it*:
The "thermostatic coil spring", when cold, holds the choke at about half closed. When starting, the same voltage that is applied to the starter is applied to the choke to close it the rest of the way. After the Onan starts, the voltage is removed so the choke goes back to half... then opens the rest of the way as the motor heats up. During a hot start, the electric side of the choke DOES still close the choke but it would only be half way.
While it may not match up to most peoples idea of how a choke "should" work, remember that the Onan starts with the throttle held fully open. (Due to the function of the mechanical governor.)
The biggest problem with Onan chokes I have seen, is that the choke sticks from non-use of the generator. A close second is rust.
* The way I understand it may or may not have anything to do with reality. 
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Onan 6000 Choke question [message #117618 is a reply to message #117582] |
Sat, 05 March 2011 01:59 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On Mar 4, 2011, at 7:26 PM, Mike Miller <m000035@gmail.com> wrote:
>
>
> James Hupy wrote on Fri, 04 March 2011 11:19
>> John, I believe that the choke circuit is energized with the
>> starter circuit
>> so that when it is cranking, the choke is applied and when the
>> starter motor
>> is disengaged, the power to the choke is either on a timed delay or
>> off.
>
>
> The way I understand it*:
>
> The "thermostatic coil spring", when cold, holds the choke at about
> half closed. When starting, the same voltage that is applied to the
> starter is applied to the choke to close it the rest of the way.
> After the Onan starts, the voltage is removed so the choke goes back
> to half... then opens the rest of the way as the motor heats up.
> During a hot start, the electric side of the choke DOES still close
> the choke but it would only be half way.
>
> While it may not match up to most peoples idea of how a choke
> "should" work, remember that the Onan starts with the throttle held
> fully open. (Due to the function of the mechanical governor.)
>
> The biggest problem with Onan chokes I have seen, is that the choke
> sticks from non-use of the generator. A close second is rust.
Mike's description of how it works is very good. Years ago my choke
didn't work very well and I determined that the rust on the bracket
where it bolts to the hot manifold was causing poor electrical
connection for the ground. I felt that cleaning the rust wouldn't
work long term so I soldered some #10 wire to the side of the choke
and put a terminal on the end of the wire and put it under a bolt head
a few inches away on the Onan frame where there was no heat and rust.
That did the trick. My choke has worked well now for many years.
Emery Stora
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