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Onan LPG Gen Set wont start, HELP, HELP!


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9 replies to this topic

#1 rlbarkleyii

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Posted 04 October 2013 - 06:06 PM

Changed the oil and filter on my Onan Mobile Genset HGJAB (MARQUIS) , 6500 kw (333 hours) high pressure propane fueled. Ran like a bandit one hour before oil change, now the darn thing wont start at all? Two thirds tank of LPN.

 

To change oil I opened the access panel, opened the LPG oil drain ****, opened the engine oil **** drained oil. CLOSED both petcocks

 

Removed and replaced the oil filter with new one. Filled the filter core with oil before installing, refilled with 15W-40 DELO and checked the oil level.

 

Oil level 1/3 up the stick from add. Not overfilled, not underfilled. Tried to crank it up, turns over fast, but non hits or misfires, just would not start, smelled fuel, no ignition?, no fuel?   

 

What did I do wrong???    HELP, HELP, HELP!!


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2002 Winnibago Journey 32", Diesel pusher, Cummins ISB 275 HP, Allison 2000MH, 4.56 Rear Ratio, Freightliner XC Chassis, Onan 6.5KW  propane, pulling Toad; 2012 Nisson Xterra 4X4 Auto, Roadmaster Baseplate, and towbar, Remco Driveshaft Disconnect.
 
Off and On again Fulltimer.
 
"KEEP THE WIND TO YOUR BACK, THE SUN TO YOUR FACE, AND THE GREASY SIDE DOWN"

#2 vtbigdog

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Posted 04 October 2013 - 06:09 PM

Some Onan generators have a sensor in the oil sump that will shut down the generator if the oil level is low.


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Regards,

Richard

2003 Safari Trek 3011 W20
8.1 Workhorse / Allison

#3 rlbarkleyii

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Posted 04 October 2013 - 06:28 PM

Thank you for your reply. I am aware of the oil shutdown sysytem. I had the oil level initially filled to the full level, and when it wouldn't start i wondered if i had overfilled it and removed some of the oil to about a little below half full. Tried several more times, no go!


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2002 Winnibago Journey 32", Diesel pusher, Cummins ISB 275 HP, Allison 2000MH, 4.56 Rear Ratio, Freightliner XC Chassis, Onan 6.5KW  propane, pulling Toad; 2012 Nisson Xterra 4X4 Auto, Roadmaster Baseplate, and towbar, Remco Driveshaft Disconnect.
 
Off and On again Fulltimer.
 
"KEEP THE WIND TO YOUR BACK, THE SUN TO YOUR FACE, AND THE GREASY SIDE DOWN"

#4 vtbigdog

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Posted 04 October 2013 - 06:31 PM

Do you other propane appliances light?


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Regards,

Richard

2003 Safari Trek 3011 W20
8.1 Workhorse / Allison

#5 vtbigdog

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Posted 04 October 2013 - 06:45 PM

Do you see a vent hose underneath the unit?  This is a vent and it may be plugged.  Run a wire into it to unclog it and try again.


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Regards,

Richard

2003 Safari Trek 3011 W20
8.1 Workhorse / Allison

#6 DickandLois

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Posted 04 October 2013 - 10:00 PM

I had to look at the oil requirements when you mentioned 15-40 grade and it is OK for the unit.

 

Regarding the oil filter, the manual lists part number 122-0836 for your unit. Was the proper filer used ? Part number 122-0800 is listed for a number of the generators.

 

You mentioned smelling fuel, so that should not be an issue unless there is an open fuel line.

 

With no hits or misses, it sure sounds like ignition issue, the only thing I question is an oil filter issue ??? But if that part number is correct, that leaves ignition or that open fuel line I mentioned.

 

Do you read any codes from the System? What year is your coach?

 

Rich.


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#7 wolfe10

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Posted 05 October 2013 - 09:45 AM

With a propane generator, it is easy to rule out fuel as the cause (meaning the issue is ignition-related.

 

Shut off the coach main 120 VAC breaker.

 

Get a propane bottle/torch-- do NOT light it.

 

Turn on propane with the nozzle of the torch in the air cleaner.

 

If it tries to start, you have a fuel issue.  If not, an ignition issue.

 

You could also pull a spark plug wire and see if you have fire, but in many installations, the spark plugs are difficult to access.


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Dianne and Brett Wolfe
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#8 aztec7fan

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Posted 05 October 2013 - 09:07 PM

Is it possible you have an air bubble on the oil sensor giving it a false reading of low oil?  Try agitating the unit to get rid of any bubbles, and possibly removing and reinstalling the sensor.


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Chris Guenther
F3508-S
Westminster, CO
1989 33' Southwind (Gas 454 Chevy)

 

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and memories are like starlight, they go on forever"

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#9 f301359

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Posted 06 October 2013 - 11:50 PM

You might try looking at your leak detector in the coach, if it smells propane it will shut off the flow until it resets and you can verify if you have propane flow by lighting a stove top burner. If it lights you have good flow and you will have to look elsewhere.

 

I had a similar problem with my coach. I couldn't get anything to light and I noticed that some one had turned off my leak detector.

 

Good luck.


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#10 rlbarkleyii

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Posted 04 November 2013 - 11:03 AM

Thanks to all who replied. 

 

Repair completed genset now operating !  LESSON LEARNED:  Engine would not start because hose from bottom of carburetor to crankcase behine the drain valve had deteriorated due to the use of a non-approved type rubber hose which disintegrated . I must have touched it when changing the oil, and it crumpled without my knowledge. Replaced the hose and it now runs great. 


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2002 Winnibago Journey 32", Diesel pusher, Cummins ISB 275 HP, Allison 2000MH, 4.56 Rear Ratio, Freightliner XC Chassis, Onan 6.5KW  propane, pulling Toad; 2012 Nisson Xterra 4X4 Auto, Roadmaster Baseplate, and towbar, Remco Driveshaft Disconnect.
 
Off and On again Fulltimer.
 
"KEEP THE WIND TO YOUR BACK, THE SUN TO YOUR FACE, AND THE GREASY SIDE DOWN"




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