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Old 12-04-2020, 12:27 PM   #1
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Brand: Thor Motor Coach
State: Wisconsin
Posts: 9
THOR #21256
Onan QG4000 Spec R for Ridiculous

Per title, I have an Onan Gas Generator, Spec R. I checked out some YouTubes on maintenance.

-Oil Change, same
-Fuel Filter, pretty close to my situation
-Air Filter, same
-Spark Plug, ????

Its in the same approximate location, but I can't figure out how to get in there with a socket wrench. It's way too narrow underneath to fit a deep socket. I've considered drilling a hole thru the metal from under the carriage to fit a socket extender, but that's all I can think of. Anyone acquainted with this particular "RV Dealer Service Friendly" design for something that should be simple?

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Old 12-04-2020, 02:30 PM   #2
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Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,760
THOR #13932
Drill the hole.
It's a common thing.
Oldsmobile big block
Ford big block
You drilled holes through the fender well or you pulled the motormounts to access sparkplug.

I'm not sure about onan, but sparkplugs are now 100,000+miles items in many installations, not the 12,000 mile item they used to be....
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Old 12-04-2020, 02:50 PM   #3
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Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
Quote:
Originally Posted by Ovation12s View Post
Per title, I have an Onan Gas Generator, Spec R. I checked out some YouTubes on maintenance.



-Oil Change, same

-Fuel Filter, pretty close to my situation

-Air Filter, same

-Spark Plug, ????



Its in the same approximate location, but I can't figure out how to get in there with a socket wrench. It's way too narrow underneath to fit a deep socket. I've considered drilling a hole thru the metal from under the carriage to fit a socket extender, but that's all I can think of. Anyone acquainted with this particular "RV Dealer Service Friendly" design for something that should be simple?


Don’t forget to clean the spark arrestor.
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