Onan late model carburetors with altitude adj.

[land]

I'm having a problem figuring out how to open carb while still mounted, no room to unmount, would like to clean bowl, blow out internal ports but can't figure out how to take off bowl. Older models have bolt under bowl for simple removal and giving access to fuel level valve and back flushing to supply line.
Down loaded manual for BGM but it only covers previous models.
Model # 5-58GMFA26105H Serial D990895699
Marquis 5500 for RV Gasoline
Thanks,
Dave

[Billy J Shafer]

Take a good look under the carb. I think you will find the bowl nut. You may have to remove the plastic adjuster to get to it.

[land]

Originally Posted by Billy J Shafer

Take a good look under the carb. I think you will find the bowl nut. You may have to remove the plastic adjuster to get to it.

Plastic adapter is the knob for the altitude adj. How do you remove it? No obvious way. With a price of almost 200 bucks for new carb, don't want to break it.

[Max Thompson]

http://www.cumminsonan.com/www/pdf/m.../965-0531B.pdf
Try this one, it covers the latter model BGM. Give it some time to download, it is a large file.

[Billy J Shafer]

It will pry off. Just take it easy.

[land]

Originally Posted by Billy J Shafer

It will pry off. Just take it easy.

Wrong!!
New ones don't pry of they break.
Adj. Lever is attach by a rivet like shaft, which breaks.
The right way to take off the bowl is to unscrew entire bowl until treaded center bolt is loose enough to allow it to come off. Top of bowl is resting on o-ring at top, breaking the shaft at the bottom has a small o-ring sealing the bowl atltitude lever connection. Small O-ring is held in place by using the shaft rivet shoulder to keep it in place.
Now I have to try and find a replacement bowl and adj. knob set, temp fix will try to reengineer the bottom of the nut to hold the small o-ring in place.

[Billy J Shafer]

Sorry about that. But you must have a carb I have never seen. Because I just rebuilt one two months ago.

[land]

Originally Posted by Billy J Shafer

Sorry about that. But you must have a carb I have never seen. Because I just rebuilt one two months ago.

Did it have the altitude adj at the bottom where the usual bolt to remove the bowl is?

[Billy J Shafer]

Yes they are all at the bottom side facing out. Sorry for your mishap. But anyone on this site will tell you. I do not give out bad advice. At least I try not to. Been with Onan since 1980.

[land]

Originally Posted by Billy J Shafer

It will pry off. Just take it easy.

You did say take it easy, so I did but I should have taken it easier
yesterday I broke the second limb trimmer from HF, nice to know my strength at 71 is still strong, but I have a feeling chinese pot metal is the problem.

[pegasuspinto]

I'll second that you can pry off the plastic, this works fine on even the later model carbed' sets made in the late 2000's. Their idea of altitude adjust might of been fine when new but 15 years later, some wear and tear, ethanol fuel later you gotta get more range of adjustment at times. After all the altitude adjustment is REALLY the 'full load mixture' adjustment of old. One thing we can't convey on the internet is the 'touch and feel' of experience, that is why we can get them off without breaking things-anymore. LOL.

[Billy J Shafer]

Well pinto I still break things at times. Broke a headlamp on a fork lift the other day. Still don't know how I did it. Some days it pays to stay in bed.