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Old 10-10-2021, 01:03 AM   #1
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Brand: Thor Motor Coach
State: Minnesota
Posts: 83
THOR #20429
Onan 4000 Generator oil leak

My 2021 Four Winds Onan generator needed its first oil change. I was surprised to find that it was leaking oil, only when it's running. Leak pools to the size of a half dollar after 20 minutes of running.
It does not appear to be the crank cover but instead toward the left front as i am looking at the unit. Now, I don't do any dry camping and only use the unit to run the AC while driving AND, the monthly 1 hour load.

Any thoughts, suggestions other than taking it back to the terrible dealer?

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Old 10-10-2021, 01:21 AM   #2
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Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 8,726
THOR #1469
Take it to a Cummins dealer not an RV dealer
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Old 10-10-2021, 03:03 AM   #3
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Model: A.C.E. 27.2
State: Indiana
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THOR #14698
Quote:
Originally Posted by EA37TS View Post
Take it to a Cummins dealer not an RV dealer
Yep the Cummins webpage lists several service centers in Arizona.
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Old 10-10-2021, 12:40 PM   #4
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Originally Posted by EA37TS View Post
Take it to a Cummins dealer not an RV dealer
Thanks guys never thought of that.
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Old 10-24-2021, 11:42 AM   #5
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Brand: Still Looking
State: Massachusetts
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THOR #22385
They are great to work with in Dedham ma.
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Old 10-24-2021, 06:32 PM   #6
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Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,100
THOR #20220
Cummings fixed mine free and 2 year warranty
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