| [GMCnet] Noisy Onan [message #333203] |
Thu, 07 June 2018 18:31  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
|
Senior Member |
|
|
The choke on the Onan is only pulled on while the starter is turning over. Once the starter stops turning the choke is not held closed electrically. I found that out while designing the kit that allows the Onan to run off either gasoline or propane at the flip of one DPDT toggle switch. I used that same choke circuit to open the propane bypass valve to allow propane to flow around the demand regulator while the starter was engaged. The other side of the DPDT toggle switch either powered the fuel pump (while on gasoline) or the propane shut off valve (while on propane). It is very easy to flood the Onan running on gasoline if the spark control is still via the old points. In that case the weak spark makes it hard to start keeping the starter motor engaged for longer than it was designed to be resulting in too much gas and wet plugs that do not fire well. Change out the spark control to a pertronics kit like the one developed by Gary Bovee and most Onan running/starting issues will be a thing of the past, especially if you run it off propane. It just is not worth the hassle to try to make that old thing run off gasoline unless you replace every rubber part that touched the ethanol laced junk now sold as gasoline. That includes the gaskets and o rings in the original fuel pump and carb, the line coming to the fuel pump, and including the tiny o ring in the carb. Then make sure you have cleaned the strainer in the carb and fiddle for way too long trying to get it adjusted to where it will run properly at idle and under load. With propane it is set, forget and enjoy unless something physically breaks inside the barbarian.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
============
Message: 5
Date: Thu, 7 Jun 2018 10:41:16 -0700
From: James Hupy
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Noisy Onan
Message-ID:
Content-Type: text/plain; charset="UTF-8"
The choke is kinda touchy when starting from cold. Usually, if you have a
problem on cold start, and you adjust for that, then when the unit is
warmed up, the choke is too rich. Touchy adjustment. Sometimes the ground
wire on the choke is rusty and corroded. A cleanup helps. Worth a try.
Jim Hupy
On Thu, Jun 7, 2018, 10:34 AM Deb McWade wrote:
> Got the Onan running, but not well I think. Sat for 4 days after getting
> it back, took about 15 seconds to start (sounded like wasn't getting fuel;
> fine on re-start). Since I have never had it running, and haven't heard
> another, I can't be certain, but I don't think it should sound like
> this....https://www.screencast.com/t/3dRknmXzB
>
> Oil, filter, etc all good, new fuel filter.
>
> Of course louder than is coming up here, like a metal fan striking the
> housing, but more intense. Any ideas about what I'm looking at here before
> I
> take the next step? Or you tell me what that should be ;)
>
> Thanks for your insight... I have none naturally. Deb
> --
> Deb McWade
> Logan Lake, BC, CAN
> "Li'l Sister"
> '77 Kingsley, 403, EBL EFI;
> TZE167V101404
> It's Bigger on the Inside!
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
