| Onan maintenance issues - rebuild kit warning [message #277735] |
Tue, 12 May 2015 18:20  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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When I first tried, I could not locate a local supplier for the indicated carburetor kit. When I tracked down both G1-LM and K1-LMB, neither had a needle and seat in the kit. I located and aftermarket LMB kit that did...
PrimeLine Carburetor kit 06-1016 or 7-02020 Both numbers are on the package.
Is nearly useless. It contains lots of parts, but many are not right for the Onan BF. I cannot say for the NH, but I would be surprised if it was any better.
The bowl gasket is close and it does have an O-ring that can fit the main needle, but there aren't enough of the gaskets of the size you want for the both the float seat and the float bowl screw. One of the too large can be worked to fit the seat. And one gasket does fit the intake flange.
About the needle and seat, this is a soft nosed needle and a hard seat. The OE is a soft seat (or was once) and a hard needle. That shouldn't matter. The problem is that the seat was drilled 0.111 (about the same as the old seat before the rubber element was pushed in there). As it is, the 3 psi of the fuel pump can push right past this. I made it work by plugging and redrilling the the new seat to 0.040 (#60). This is not an operation that can be done with normal shop tools.
That O-ring for the main needle will only go in with a lubricant. It is not sized correctly, but it can be made to work. I didn't even think of this one until the Jim Hupy note. Mine was toast. Harder than toast, actually.
The bowl gasket is actually small, but with care, it can be persuaded to stay in its groove during assembly.
The narative:
Well, my Onan has been remarkable. It gives us less trouble that our Gravelys that are about the same age. Last season it started having a problem the I thought I had figured out. The mixture control was unstable and it would sometimes just go rich. I had seen this before. It looked just like the "sinking float syndrome". As I have a spare BF Onan (thank you Ken Wolkins), I got the float from that one and it seemed to cure the issue. But not for long. I managed to acquire an NOS float. Well then I did the thing I should have done before, I weighed each. They were within 0.1 gram of each other.
I located rebuild kits for the Walbro LMB, I bought three. (One for each I have and a spare.) This is the kit that promised a needle and seat. Yesterday I got at it. As said, it up and online again. I still need to warn it up and load it to get it settled in, but I have confidence.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Onan maintenance issues - rebuild kit warning [message #277738 is a reply to message #277735] |
Tue, 12 May 2015 19:37  |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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> On May 12, 2015, at 7:20 PM, Matt Colie wrote:
>
> When I first tried, I could not locate a local supplier for the indicated carburetor kit. When I tracked down both G1-LM and K1-LMB, neither had a
> needle and seat in the kit. I located and aftermarket LMB kit that did...
HI Matt,
I had a similar experience with the missing needle/seat in the rebuild kits - however by looking at sellers’ pictures I able to find some K1-LMB kits that did include these components.
The Onan in my personal coach took a spell of bad behavior one year at the amateur radio Field Day event.. it would take turns between running good and running too rich. After much effort we finally tracked the problem down to the seat - a small “finger” had torn loose from it but was still attached at one end. It would occasionally make its way downward into the fuel path and prevent the needle from being able to seal properly... thus the bowl would over fill and flood out the engine.
IMO it is very important to study the rebuild procedure that comes with the kit as well as the procedure in the manual. If the seat is not installed in the proper orientation and depth then one can have all kinds of difficult-to-diagnose issues.
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Onan maintenance issues - rebuild kit warning [message #277740 is a reply to message #277738] |
Tue, 12 May 2015 20:16 |
Jim jr
Messages: 26
Registered: May 2009
Location: Hamilton, Oh.
Karma: 0
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Junior Member |
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James the thickness of that gasket can effect the height of the float too..
> On May 12, 2015, at 8:37 PM, Jim Miller wrote:
>
>> On May 12, 2015, at 7:20 PM, Matt Colie wrote:
>>
>> When I first tried, I could not locate a local supplier for the indicated carburetor kit. When I tracked down both G1-LM and K1-LMB, neither had a
>> needle and seat in the kit. I located and aftermarket LMB kit that did...
>
>
> HI Matt,
>
> I had a similar experience with the missing needle/seat in the rebuild kits - however by looking at sellers’ pictures I able to find some K1-LMB kits that did include these components.
>
> The Onan in my personal coach took a spell of bad behavior one year at the amateur radio Field Day event.. it would take turns between running good and running too rich. After much effort we finally tracked the problem down to the seat - a small “finger” had torn loose from it but was still attached at one end. It would occasionally make its way downward into the fuel path and prevent the needle from being able to seal properly... thus the bowl would over fill and flood out the engine.
>
> IMO it is very important to study the rebuild procedure that comes with the kit as well as the procedure in the manual. If the seat is not installed in the proper orientation and depth then one can have all kinds of difficult-to-diagnose issues.
>
> --Jim "saving the lives of Onans...one unit at a time" Miller
> 1977 Eleganza II
> 1977 Royale
> Hamilton, OH
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: Onan maintenance issues - rebuild kit warning [message #277741 is a reply to message #277735] |
Tue, 12 May 2015 20:29 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Has anyone checked to see if Stens make a kit? They make kits for most lawn and garden engines as an alternative to the OEM parts. Onans were in a lot of earlier tractors--not sure if carbs same as NH
John Lebetski
Woodstock, IL
77 Eleganza II
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