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Old 01-26-2015, 06:17 PM   #1
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Generator Question

Hello, I have an Onan 4000 Genset located in the undercarraige of my RV. Carb has gummed up on me and I need to clean it. My question is... How do I lower the generator so I can have access to remove the carb and replace the other spark plug? Thank you!

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Old 01-26-2015, 06:31 PM   #2
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If you add the make, model, and year to your signature, you wont have to include it every time you ask a question. Then someone may be able to help.

Welcome to the best place on the web for help.

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Old 01-26-2015, 06:40 PM   #3
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Hydraulic floor jack
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Old 01-26-2015, 07:19 PM   #4
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Two spark plugs?
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Old 01-26-2015, 10:03 PM   #5
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Search youtube for video on gen maint and you will find that the "pros" don't recommend rebuilding onan gen carbs. They say replace....
Full time since Nov 2012 RVM#41 Gary and Marian Hill 2001 Monaco Dynasty Jack 38' 370 hp ....If it ain't broke I can still fix it.
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Old 01-27-2015, 12:57 AM   #6

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On our '94 Montara with an Onan 4000, I don't need to drop the generator to remove the carb. I just remove the air cleaner and then two 10mm bolts and the fuel line. It's tight but works.

Tim Bowman
1994 Montara
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Old 01-27-2015, 06:07 AM   #7
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As was mentioned, there is no 'other' spark plug, a 4kw Onan is powered by a 304cc single cylinder engine.

But before you try removing the carb, disconnect the fuel line and with a short piece of hose give it a good dose of straight SeaFoam then leave it sit overnight. Next day try running it on a 25% SeaFoam, 75% gasoline mixture.
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Old 01-27-2015, 06:15 AM   #8
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I rain gas outboards in a salt/sand environment for 10 years. Between bad gas, water/sand in fuel etc, ive worked on lots of carbs. Best varnish removal product I've ever found is AUTOTUNE by OMC. Take the hose to carb off at fuel pump, insert nozzle on can, spray in foam (looks like shaving cream), wait 15 min, start engine. I fixed lots of ourboards/gennys with this trick.
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Old 01-27-2015, 07:15 AM   #9
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Originally Posted by homeless View Post
Hydraulic floor jack
Uh,, Try a transmission jack,, Works better.
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Old 01-27-2015, 02:10 PM   #10
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Originally Posted by Murf2u View Post
As was mentioned, there is no 'other' spark plug, a 4kw Onan is powered by a 304cc single cylinder engine.
I’m guessing it depends on the year. My 1987 Tioga has an Onan 4k with a two cylinder 782cc flathead pancake engine and the “other” spark plug is hard to get to without lowering the genset.


1987 Fleetwood Tioga, Ford E350, 460cid with C6 and Gear Vendor under/overdrive
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