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Old 06-21-2018, 12:18 PM   #1
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Onan 5500 generator looks like smoking from spark plug

The last few times I've tried to start up and run my generator after it run for a few minutes either under a load or not under a load it would start smoking out of the exhaust pipe and when I try today it's smoked out of the spark plug. I double check to make sure if my air filter was seated properly everything else was recent on it or oil fuel filter and everything else.
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Old 06-21-2018, 12:26 PM   #2
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#1, Make sure the spark plug is tight.

# 2 make sure you did not overfill the oil.
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Old 06-21-2018, 12:47 PM   #3
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I did recently have to add oil back in from an oil leak but how do I know if I put too much in? I more than likely did add too much oil. For the spark plug it's never been touched since I got the unit and just started doing this recently could the spark plug be bad?
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Old 06-21-2018, 01:04 PM   #4
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Is the smoke from the plug, or could it be oil that got spilled and is now smoking and coming up around the spark plug..

I suspect if the oil filter was removed, you have a small amount of oil that got spilled behind the filter area..
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Old 06-21-2018, 01:15 PM   #5
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Quote:
Originally Posted by nc77089 View Post
I did recently have to add oil back in from an oil leak but how do I know if I put too much in?
I'd expect there to be a dip stick as part of the oil fill cap, isn't there one there?
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Old 06-21-2018, 01:50 PM   #6
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My suspected oil leak did look like it come from the oil filter being too loose which I tightened up. I tried to wipe up most of the oil much of the oil I could. The dipstick gauge shows full but I didn't start having these issues until I literally fixed the oil leak issue.
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Old 06-22-2018, 10:32 AM   #7
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If spark plug is tight and not overfilled it's probably smoking from spilled oil

Let it run awhile and see if it goes away
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Old 06-23-2018, 10:04 AM   #8
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I'm going to drain, re measure the oil And refill first. I appreciate all the input.
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Old 06-27-2018, 11:03 AM   #9
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Well I drained it and it looks like it was low (3.5qt cap.) Not over filled so I'm just going to redo the oil change.
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Old 07-01-2018, 06:04 PM   #10
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Update: I had redid the oil change in the generator. Then I like roughly let it run for and about 45 minutes. It smoke the entire time couldn't tell where it was coming from. But when I cut it off it starts smoking a lot from the spark plugs especially the one in the rear. I'm gonna try replacing the spark plugs and add fresh fuel once I use up more of the old fuel.
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Old 08-02-2018, 08:23 PM   #11
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Here's another update I finally got around to replacing the spark plugs on the generator started up running about 10 minutes and started still smoking even from where the spark plugs are at neighbor came by and said he was wondering if that might be the rings. My next steps going to be setting aside a hundred fifty bucks to take it to a generator shop just around the corner from my home.
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