Home » Public Forums » GMCnet » Mr. Onan (No Spark)
| Mr. Onan [message #223842] |
Sat, 28 September 2013 09:31  |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma:
|
Senior Member |
|
|
I have exhausted my knowledge and research on trying to get the Onan to fire. Recently new to me. Sat for five years. PO said they had used it and had paperwork for repairs including new starter and starting solenoid. Both were visibly new but ultimately tested bad. I am no expert but have worked on every type of engine including; lawn and power equipment, chain saws, motor cycles, snow mobiles, cars, truck, tractors, combines, etc. I have never not been able to get spark until I met Mr. Onan.
Onan would not even crank so I went through the trouble shooting guide in the service manual. Check voltage, jump this, jump that, etc. Test indicated bad starter. I got a second Onan from Sean Kid (Thank you very much), so I swapped out the starter and it cranks but no spark.
On to the "Control" section of the service manual. Everything tests ok except for the starting solenoid. Only 7.5 volts when cranking. Swapped out the solenoid and still only 7.5 volts when cranking and no spark. I have systematically tried all replaced all components of the control system including; the board (Onan boards, not Gorilla), starting solenoid and coil. No spark so on to the ignition section.
Here it gets interesting. I was able to get a single spark. When you you push the start button I would get a single spark and then no more. Release the button, try again and one single spark. I have tried the original points and condenser, donor points and condenser, and new points and condenser. Got the single spark from old points, donor points, but not new points?
Not sure what to do now, but I suspect possibly the oil sensor circuit? I don't know what direction that circuit fails, safe or otherwise. I just thought about it this morning. I am going to remove wire 12 from the oil circuit and see if that does it. I am hoping that a failed oil circuit was killing the spark after one spark?
Any thoughts or ideas would be appreciated?
I am tempted to order the Gorilla board but I understand Onan dealers won't work on them and this one may be headed to the dealer if I can't make it spark. My other option is to swap in the entire donor Onan and go that route, but it made sense to me to try and get the existing Onan to run first.
I carry a Honda 2000 in my truck camper and have a properly sized smaller AC unit that work well together but the 2000 won't drive a full size AC unit. I can carry the 2000 for basic electric but will need Mr. Onan for AC duty.
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
|
|
|
|
Current Time: Tue Sep 24 14:28:59 CDT 2024
Total time taken to generate the page: 0.00705 seconds
|
GMCforum
Search
Help
Register
Login
Home
