| Onan carb float [message #243775] |
Sun, 16 March 2014 14:18  |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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What's the trick to getting the float bowl re-installed without binding the float?
With the bowl off and the needle and float in place I can blow through the inlet tube and the float and needle move freely.
When I screw the bowl in place the needle seals in the seat and I cant blow through inlet.
I've had this apart in the past and it went back together with no problem.
Few days ago Onan was running for a while and died. Got spark, fuel in the tank, and the pump is working. Wouldn't re-start.
After trying to start today with no success- removed float bowl and it was bone dry. No fuel getting past the inlet valve.
Suggestions please.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: Onan carb float [message #243778 is a reply to message #243775] |
Sun, 16 March 2014 14:36  |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
Karma: 0
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Sounds like you have something installed wrong. The bowl shouldn't interfere with the float at all. I'd take the bowl off and give everything a once over to make sure you didn't miss something.
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
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| Re: [GMCnet] Onan carb float [message #243781 is a reply to message #243778] |
Sun, 16 March 2014 14:45 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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GENE, on some of the walbro carbs on Onan engines, there is a flat area on
the bottom of the bowl. That should be aligned with the low side of the
float, or it will hold the inlet valve closed when bowl is installed. Also
on some applications, there is a fiber washer on both the inside as well as
the outside of the bolt in the center of the bowl, or adjustable jet
needle, depending upon application.
JIM Hupy
Salem, Oregon
78 GMC Royale 403
On Mar 16, 2014 12:36 PM, "David Orders" <dao@oarsllc.com> wrote:
>
>
> Sounds like you have something installed wrong. The bowl shouldn't
> interfere with the float at all. I'd take the bowl off and give everything
> a once over to make sure you didn't miss something.
> --
> 1976 Royale "Twinkie II", 1978 Palm Beach with front end fire. Lynnwood WA
> - "We may not be able to stop all evil in the world, but I know that how we
> treat one another is entirely up to us."
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Onan carb float [message #243783 is a reply to message #243777] |
Sun, 16 March 2014 14:54 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Mike,
Thanks for suggestion, but I've got plenty of fuel down stream past that point. Not the issue.
Carb is off the engine.
At this point I'm just trying to get AIR to pass the needle and seat with float bowl installed. If air wont pass neither will fuel.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: Onan carb float [message #243787 is a reply to message #243778] |
Sun, 16 March 2014 15:19 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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David,
Only 4 parts involved-only goes together one way and I have checked it numerous times. Not saying I'm not missing something- just can't see what it is.
Jim,
My float bowl is flat all the way around the bottom- no raised portion. It has 2 fiber washers. One inside and one outside the bowl.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Onan carb float [message #243790 is a reply to message #243787] |
Sun, 16 March 2014 15:43 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Then, it is probably the inlet seat. They are made today of a material
called "viton" or similar, and are alcohol resistant. The original ones
were not resistant, and they get soft and gummy when they are exposed to
alcohol fuels. They can be changed out, I usually just turn an appropriate
sized screw into them and pry them out. The new one is easily damaged
during install. I usually use a piece of drill rod that just fits the seat
bore, and press it in by hand. Darn gummy fuels anyhow. We just have to
keep coming up with band aid fixes for these dinosaurs, in spite of what
kinds of fuel blends we are faced with.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Sun, Mar 16, 2014 at 1:19 PM, gene barrow <barrowgene@gmail.com> wrote:
>
>
> David,
> Only 4 parts involved-only goes together one way and I have checked it
> numerous times. Not saying I'm not missing something- just can't see what
> it is.
>
> Jim,
> My float bowl is flat all the way around the bottom- no raised portion. It
> has 2 fiber washers. One inside and one outside the bowl.
> --
> Gene Barrow
> Lake Almanor, Ca.
> 1976 Palm Beach
> _______________________________________________
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| Re: [GMCnet] Onan carb float [message #243813 is a reply to message #243790] |
Sun, 16 March 2014 17:25 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Jim,
The seat does feel mushy/springy when I push on the needle.
Where would I obtain a replacement seat, needle, or complete valve. Can it be matched from more common carb kits?
Thanks
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Onan carb float [message #243850 is a reply to message #243816] |
Sun, 16 March 2014 20:00 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Well, as luck (bad or good?) would have it I will be in Jim K's area on Tuesday. So if I don't find any thing local tomorrow I'll go see Jim.
Thanks to all for suggestions.
I betting Jim H. has it right- inlet seat FUBAR due to too much alcohol. If it does this to hard rubber parts I'm afraid to find out what it's doing to my liver!
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: Onan carb float [message #243865 is a reply to message #243775] |
Sun, 16 March 2014 21:26 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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They should take the ethyl alcohol out of gas and use it to boost the proof on Kentucky whiskey.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Onan carb float [message #244181 is a reply to message #243775] |
Tue, 18 March 2014 18:56 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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| gbarrow wrote on Sun, 16 March 2014 13:18 |
What's the trick to getting the float bowl re-installed without binding the float?
With the bowl off and the needle and float in place I can blow through the inlet tube and the float and needle move freely.
When I screw the bowl in place the needle seals in the seat and I cant blow through inlet.
I've had this apart in the past and it went back together with no problem.
Few days ago Onan was running for a while and died. Got spark, fuel in the tank, and the pump is working. Wouldn't re-start.
After trying to start today with no success- removed float bowl and it was bone dry. No fuel getting past the inlet valve.
Suggestions please.
|
When you blow into the fuel inlet with the bowl off--you blow into the atmosphere through the float needle. When the bowl is on, the only place for the air to go is through the main jet (I don't think the bowl is ventilated but could be wrong. I would unscrew the main jet which is the one at the bottom of the bowl and then try it again. The air has to go somwhere and something upstream is plugged or closed.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Onan carb float [message #244226 is a reply to message #243865] |
Wed, 19 March 2014 06:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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The problem is, it then becomes 'Blended' instead of "Bourbon" and at that point it is best poured back into the horse.
--johnny
'76 23' transmode norris
________________________________
From: John R. Lebetski <gransport@aol.com>
To: gmclist@temp.gmcnet.org
Sent: Sunday, March 16, 2014 10:26 PM
Subject: Re: [GMCnet] Onan carb float
They should take the ethyl alcohol out of gas and use it to boost the proof on Kentucky whiskey.
--
John Lebetski
Chicago, IL
77 Eleganza II
Source America First
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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