| Onan Generator [message #205878] |
Thu, 25 April 2013 17:36  |
DrPepper
Messages: 80
Registered: February 2013
Location: Goose Creek,SC
Karma: 0
|
Member |
|
|
Does anyone have the "How To" on Adjusting the Onan Carbator?
We cleaned the Carb but not sure what the Default Turns on the Idol and Main Jet Screws should be?
Also Anyone have any idea what the Tork Spec is on the Long Bolt that connects the Stator to the Motor Shift?
Thanks in Advance
Phil
Phillip Udel - I Own a 1975 Avion
|
|
|
|
| Re: Onan Generator [message #205880 is a reply to message #205878] |
Thu, 25 April 2013 17:48  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
|
Senior Member |
|
|
Sir: Normal settings are 1-1/4 turn open for main fuel jet
and one turn open for idle fuel jet.
http://www.bdub.net/manuals/Onan/Onan6kwNH_Major-Service.pdf
Don`t really know which bolt you mean but you should find it here. Here is more.
http://www.bdub.net/manuals/index.html
| DrPepper wrote on Thu, 25 April 2013 18:36 |
Does anyone have the "How To" on Adjusting the Onan Carbator?
We cleaned the Carb but not sure what the Default Turns on the Idol and Main Jet Screws should be?
Also Anyone have any idea what the Tork Spec is on the Long Bolt that connects the Stator to the Motor Shift?
Thanks in Advance
Phil
|
C. Boyd
76 Crestmont
East Tennessee
|
|
|
|
|
|
| Re: Onan Generator [message #205882 is a reply to message #205878] |
Thu, 25 April 2013 18:03 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
| DrPepper wrote on Thu, 25 April 2013 15:36 |
Does anyone have the "How To" on Adjusting the Onan Carbator?
We cleaned the Carb but not sure what the Default Turns on the Idol and Main Jet Screws should be?
Also Anyone have any idea what the Tork Spec is on the Long Bolt that connects the Stator to the Motor Shift?
Thanks in Advance
Phil
|
I would add that it is important to remember the idle jet is a jet and not an idle air screw such as a car engine has. Opening the idle screw will richening the idle mixture on the Onan whereas opening the idle air on a carb leans the mixture.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
|
|
| Re: [GMCnet] Onan Generator [message #205909 is a reply to message #205891] |
Thu, 25 April 2013 21:21 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
| Kosier wrote on Thu, 25 April 2013 17:37 |
George,
Unless you're referring to the idle stop screw screw, you might want to
rethink that statement.
The idle adjustment screws(2) control an air-fuel mix. At least in my
experience.
Gary Kosier
I would add that it is important to remember the idle jet is a jet and not
an idle air screw such as a car engine has. Opening the idle screw will
richening the idle mixture on the Onan whereas opening the idle air on a
carb leans the mixture.
--
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
Gary,
I think this is all semantics. (Or I don't know what I am talking about which is always a possibility. Ha) To be clear I am not talking about the little screw that stops the throttle from closing too far.
My point is that there is not an idle _air_ screw on an Onan. The idle _jet_ screw (maybe I should have said low speed jet) is just that, a fuel jet. Indeed there are two fuel jets and the second is the high speed or main jet. Screw them out you get more fuel and screw them in and you get less.
I only commented because the "idle" adjustment is the opposite from the old idle-air on the bottom of carburetors. Close the Onan low speed jet down and you are shutting off fuel, making it lean. Close the carburetor idle-air and it gets richer. (less air)
If an Onan is hunting (surging) it is often because the low speed (idle) jet is too far in. The engine starves, begins to fail, the governor opens the throttle, the high speed takes over and gets it going again only to have the throttle close and start the hunting all over again.
I probably should shut up as I converted my Onan to propane several years ago.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
| Re: [GMCnet] Onan Generator [message #205915 is a reply to message #205909] |
Thu, 25 April 2013 21:33 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
|
Senior Member |
|
|
Well George,
I didn't make it very clear that I was talking about the quadrijet.
I think I need to go to bed and get some sleep.
Gary Kosier
-----Original Message-----
From: George Beckman
Sent: Thursday, April 25, 2013 10:21 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Onan Generator
Kosier wrote on Thu, 25 April 2013 17:37
> George,
>
> Unless you're referring to the idle stop screw screw, you might want to
> rethink that statement.
> The idle adjustment screws(2) control an air-fuel mix. At least in my
> experience.
>
> Gary Kosier
>
> I would add that it is important to remember the idle jet is a jet and not
> an idle air screw such as a car engine has. Opening the idle screw will
> richening the idle mixture on the Onan whereas opening the idle air on a
> carb leans the mixture.
>
> --
> '74 Eleganza, SE, Howell + EBL
> Best Wishes,
> George
Gary,
I think this is all semantics. (Or I don't know what I am talking about
which is always a possibility. Ha) To be clear I am not talking about the
little screw that stops the throttle from closing too far.
My point is that there is not an idle _air_ screw on an Onan. The idle _jet_
screw (maybe I should have said low speed jet) is just that, a fuel jet.
Indeed there are two fuel jets and the second is the high speed or main jet.
Screw them out you get more fuel and screw them in and you get less.
I only commented because the "idle" adjustment is the opposite from the old
idle-air on the bottom of carburetors. Close the Onan low speed jet down and
you are shutting off fuel, making it lean. Close the carburetor idle-air and
it gets richer. (less air)
If an Onan is hunting (surging) it is often because the low speed (idle) jet
is too far in. The engine starves, begins to fail, the governor opens the
throttle, the high speed takes over and gets it going again only to have the
throttle close and start the hunting all over again.
I probably should shut up as I converted my Onan to propane several years
ago.
--
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: Onan Generator [message #205923 is a reply to message #205878] |
Thu, 25 April 2013 22:02 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
| DrPepper wrote on Thu, 25 April 2013 16:36 |
Does anyone have the "How To" on Adjusting the Onan Carbator?
We cleaned the Carb but not sure what the Default Turns on the Idol and Main Jet Screws should be?
Also Anyone have any idea what the Tork Spec is on the Long Bolt that connects the Stator to the Motor Shift?
Thanks in Advance
Phil
|
The Onan starts and runs more or less at full throttle. The carburetor is adapted to the Onan and not all of its functions are all that important. You will find that the full throttle richness adjustment near the base of the float bowl does almost everything that is important. Warm the unit up and then turn the main jet screw in untill the unit starts to falter. Then turn it out till the unit stabilizes. This is best done under full load. Surging is a sign of lean adjustment. It's best to run a little rich for stability.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: [GMCnet] Onan Generator [message #205939 is a reply to message #205923] |
Fri, 26 April 2013 00:25 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
The best way to adjust the Main Jet is to turn on the roof air and the
electric water heater to create a load on the generator to get an
accurate adjustment.
Also keep in mind that the engine RPM is important to get the correct voltage.
On Thu, Apr 25, 2013 at 8:02 PM, Bob de Kruyff <NEXT2POOL@aol.com> wrote:
>
>
> DrPepper wrote on Thu, 25 April 2013 16:36
>> Does anyone have the "How To" on Adjusting the Onan Carbator?
>> We cleaned the Carb but not sure what the Default Turns on the Idol and Main Jet Screws should be?
>>
>> Also Anyone have any idea what the Tork Spec is on the Long Bolt that connects the Stator to the Motor Shift?
>>
>> Thanks in Advance
>> Phil
>
> The Onan starts and runs more or less at full throttle. The carburetor is adapted to the Onan and not all of its functions are all that important. You will find that the full throttle richness adjustment near the base of the float bowl does almost everything that is important. Warm the unit up and then turn the main jet screw in untill the unit starts to falter. Then turn it out till the unit stabilizes. This is best done under full load. Surging is a sign of lean adjustment. It's best to run a little rich for stability.
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
