 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Driving, Maintenance, Tuning / RVs / March 2008Onan BF series Gen giving me problems
Was runnig fine. Now it wont start. I think the problem is the coil or coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) Anyone else run into this? How did you fix it? > Was runnig fine. Now it wont start. I think the problem is the coil or > coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) > Anyone else run into this? How did you fix it? Cost of wires is small, but check the points, and plugs, both have the same gap .025, but considering the effort to remove them and put them back, I would buy new ones and insure the gap is correct. Points are not all that expensive either, I would get a new set with the condenser and insure they are gapped correctly. A good parts store can check the coil.  SignatureBILL P. >> Was runnig fine. Now it wont start. I think the problem is the coil or >> coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) [quoted text clipped - 5 lines] > all that expensive either, I would get a new set with the condenser and > insure they are gapped correctly. A good parts store can check the coil. Here is some reference material. http://www.perr.com/onan.html SignatureBILL P. > >> Was runnig fine. Now it wont start. I think the problem is the coil or > >> coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) [quoted text clipped - 10 lines] > -- > BILL P. Found the condenser. Where are the points? >>>> Was runnig fine. Now it wont start. I think the problem is the coil or >>>> coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) [quoted text clipped - 10 lines] > > Found the condenser. Where are the points? Clean the points, buy a new pair of spark plugs. One plug can't fire. They have to both fire Like old 2 cylinder motorcycles. They are under the aluminum little cover right up on top. Just behind the intake manifold. Good Luck. Matt > >>>> Was runnig fine. Now it wont start. I think the problem is the coil or > >>>> coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) [quoted text clipped - 19 lines] > Good Luck. > Matt Cleaned re gaped the plugs. Cleaned re gaped the points. Minor adjustment to the carb. Now it runs like a champ again. over an hour under load and no problems. Thanks guys. > Was runnig fine. Now it wont start. I think the problem is the coil or > coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) > Anyone else run into this? How did you fix it? Before you start changing things, why don't we try to figure out what the problem is? Remove both spark plugs, ground the shell, and check for spark while cranking. If you see good spark at both plugs, then the problem is probably something else. If you see poor or intermittent spark at both plugs, then the points/condenser are suspect - replace and retest. If this didn't give good spark, use your voltmeter to verify that you have at least 11v at positive coil terminal, and that the negative coil terminal (the one connected to the points) swings from 11v to 0v and back to 11v as you are cranking. (Depending on how quickly your meter responds, you may see an 'average' figure of 5 - 7v). If these are ok and spark is still bad, then coil may be bad. If you see good spark at one plug but poor or intermittent spark at the other, swap the plugs and see if the poor spark moves with the plug or stays with the cylinder. If the poor spark moves with the plug, then replace the plugs. If the poor spark stays with the cylinder, then swap the spark plug wires and see whether the poor spark moves with the wire or stays with the cylinder. If the poor spark moves with the wire, replace the wire - if it stays with the cylinder, then that tower of the coil may be bad. Just for reference, this genset fires both spark plugs once per revolution at the same time - the cylinder on the conpression stroke and the cylinder on the exhaust stroke - and if it's firing at all on either cylinder normally will manage to start and run. If it's running on 1 cylinder it won't be very smooth, and won't handle load very well, but should start and run. If one plug is badly fouled, it can short-circuit the voltage buildup in the coil before the voltage gets high enough to jump the gap on the unfouled plug. How frequently have you been using the genset - and how long has it been since the last time you used it? Alan > > Was runnig fine. Now it wont start. I think the problem is the coil or > > coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) [quoted text clipped - 37 lines] > > Alan It was running. I usualy run it and the engine once a month. I know it has not been running correctly for about 6 months. It was running on 1 cylinder. I replaced the plugs about a year ago. I also replaced the wires. Thats when the problem really started to get bad. I think 1 plug is not firing. When it does run it back fires and the inside plug is wet. Its an older rig and in good shape other than this. It handled loads like a champ. ran extremely smooth. the only other problem that came up today was it was putting out white smoke when it was running. I have a spark tester. Ill try that. im hoping when it was running lousy it did not hurt the coil. I checked the gap today. I think it was at 30. Ill recheck and try again. >>> Was runnig fine. Now it wont start. I think the problem is the coil or >>> coil wires. Looks like only 1 plug is firing. (1 Inside plug is wet) [quoted text clipped - 48 lines] > lousy it did not hurt the coil. I checked the gap today. I think it > was at 30. Ill recheck and try again. The spark plug gap as well as the point gap should be .025. Doubt what you found was the condenser, as it is co-located with the points under a can cover up on top of the engine, kinda between the cylinders, could be held down with a slip spring. What you found might have been on the coil and is a noise suppressor. SignatureBILL P.
|
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.