Onan Engine

[hilljred]

I just bought a Craftsman riding mower with a 20 hp Onan engine with electronic ignition. It has no spark. I would like to know how to check out the coil and the pickup for the ignition. I believe it to be a good engine. It has 110 psi on each cylinder compression. The sears model no. is 917.254430 if that means any thing. Thanks for any help.

Jerry

 

[wisbaker]

Had the pickup go out in my Wheel Horse -onan. The parts guy told me to pull both spark plugs take a VOM (Volt Ohm Meter)and measure ohms on the pick up while spinning over the engine, if it's working it'll jump up and down like a switch is opening and closing. Coil- same VOM and check resistance through the primary side and for continuity between primary and secondary circuits.

 

[joe csuti]

If eng a P series(P220)first thing to do is check that you have +12v at pos(+)terminal of coil with the ign sw in on/run position,if not then problem in ign sw,safety sw's or wiring harness on tractor.If this proves to be the problem,take a jumper wire from battery pos(+) directly to coil pos(+)terminal,crank eng & check for spark or see if eng fires/runs.

If still no spark,if eng has an oil pressure sw/low oil cutoff disconnect sw & check for spark again.If still no spark with sw disconnected,then problem in ign system.Check trigger module/coil as wisbaker said,unless you have manual for eng you you can only confirm with an ohmmeter/12v test lite that trigger module working & that primary/secondary of coil not open,unless you have a resistance value for primary/secondary of coil to compare against you don't know quality of coil & if wire turns of primary/secondary shorted.

What you might try is do a google search for onan+mod#+manual,over the yrs I have been able to download(free) service/repair manuals for different series eng at several websites.

NOTE-The above instructions are ONLY for the P series eng,if any other series/p series I would recommend locating a service/repair manual for eng if problem ON eng in ign system,be sure of what you need for parts as when/where you locate/buy you'll find out any onan part is EXTREMELY expensive & elect parts are usually not returnable.

 

[robert kummer]

jerry
if you e/mail me i will send you pages
from the onan service manual
thank you. boomer ( the used onan engine parts guy )

 

[BushogPapa]

Jerry..sounds like you are a good person to ask..

I have an old Bolens QT 16 that I replaced the original Onan with a "Big-Bore" Onan short block..

I seem to be having a problem with the carb Float not letting gas into the float bowl..
Seems to happen most when going up a slight grade or just trying to move forward..
I just put a New Needle & Seat in it and also put a low pressure electric fuel pump on it, with no improvement..
Have any ideas..??
Thanks..!
Ron..

 

[doorman]

do you buy engine parts? I have an Onan engine on a welder that I would sell for parts. I"m in West Tn.