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Old 06-24-2019, 10:47 PM   #1
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Join Date: Sep 2018
Location: Hudson, WI
Posts: 1
Onan 5500 Generator Oil leak

I recently ran my generator (Onan 5500 Marquis Gold) on my '09 Sightseer 35J for the second time this season and noticed a fairly large area of oil about the size of a paper plate that had leaked onto the pavement. This is after only running for about 5 minutes. Other than the oil filter, anyone have any insight as to where to check for the leak? It appears to be coming from the bottom left?

Thank you for the help!

'09 Sightseer 35J
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Old 06-29-2019, 03:05 PM   #2
Oldchinahand's Avatar
Join Date: Mar 2017
Location: Tucson, AZ
Posts: 335
We've had three leaks on our Onan 8K. All stemmed from a single poor oil change.

Assuming proper oil fill.

Check your drain plug. Tight and not cross threaded?

Check your filter. Tight? Did they install with gasket? Did they remove the old gasket? (double gasketed)

Are all the oil pan bolts torqued properly and evenly? (Likely hard to access)

Back story, short version: local facility changed our oil, main and genset. Cross threaded the genset drain plug. Attempted to drill out and install a larger plug. Screwed that up. Installed a new drain pan. Warped it because didn't torque properly. Got the second one right. But, failed to scrape the old filter gasket. Installed the new one over that. Leaked. Replaced filter.

Stuff happens. (yes, have a new guy)

Fair Winds and Following Seas
Terry & Rosalina
2007 Winnebago Journey 34SE
Retired Navy Mustang & Navy Wife
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