Community Forums

bob.o · 08-18-2006, 10:59 AM

The Onan is a 5.5 HGJAB, spec B with 60 hours in a 2002 Winn Adventurer. The cooling fan blows oil onto the deck adjacent the cylinders cooling shroud (primarily lef cylinder). The oil in turn runs down and drips off the bottom of the generator and is getting very messy.
The leak appears to be below the cylinders. The oil on the dip stick has dropped about 3/8" in 20 hours run time.
Any suggestions will be greatly apprecieted on what is causing the leak and how to fix it.
tnx, Bob

bob.o · 08-18-2006, 10:59 AM

The Onan is a 5.5 HGJAB, spec B with 60 hours in a 2002 Winn Adventurer. The cooling fan blows oil onto the deck adjacent the cylinders cooling shroud (primarily lef cylinder). The oil in turn runs down and drips off the bottom of the generator and is getting very messy.
The leak appears to be below the cylinders. The oil on the dip stick has dropped about 3/8" in 20 hours run time.
Any suggestions will be greatly apprecieted on what is causing the leak and how to fix it.
tnx, Bob

Ding-a-ling · 08-18-2006, 05:55 PM

Take it to an authorized dealer and get it checked. Had a similar Onan on our 2001 Adventurer that leaked oil. They said an internal seal where two halves of the engine came together (?) had disintegrated over 1/4 of its length.

Sorry I cannot be more specific - that's what I was told. Was repaired under warranty and did not leak again.

Similar timeframe on MH and gen set. Could both problems be similar?

Jeff-T · 07-04-2015, 09:53 AM

Bob, I have a Onan 5500 HGJAB with 43 hours leaking oil too. Your description matches my problem. Did you find your leak? - Jeff

scenic route · 07-09-2015, 03:49 PM

Hey Jeff-T...welcome to iRV2.

Since the original post is almost 9 years old, maybe you'll want to start your own thread for a better response.

530ktm · 07-09-2015, 09:04 PM

This is really digging into the bowels of the forum, eh?

Roger G · 07-11-2015, 10:42 AM

The Onan 5500 is prone to oil pan gasket leaks. I have fixed two of my own and my neighbors. The pan leaks into the shroud that contains the cooling fan and drive belt. If allowed to continue leaking, it will eventually cause the belt to deteriorate and break. The generator will have to be dropped from the MH in order to be fixed. It is put together in layers requiring access to the top and bottom to remove all the stuff to finally get to the pan. Parts only cost $50-$100 depending on what all you decide to replace while its disassembled but it's a major job dropping the genny. I used a transmission jack and it will take most of a day to remove, repair, and reinstall.