1. Disconnect the negative terminal of the house battery.
2. Loosen the 2 nuts on the u-bolt connecting the exhaust pipe to the muffler. No need to take the nuts off, just loosen them 5 to 10 turns or so.
3. Remove the 2 bolts holding the generator in place.
4. Remove any drain pipes.
5. Lift the generator out and place it on something sturdy. The bottom of the compartment opening is roughly 28" off the ground.
6. Remove the gas hose and clamp it.
7. Remove the cover. There are 2 torx screws on either side holding the cover in place.
8. Service as needed.
What I did for maintenance:
1. Changed the air filter.
2. Changed the fuel filter.
3. Changed the fuel pump.
4. Cleaned the float bowl and main jet and passages with metal wire, wire brush and some carb cleaner.
5. Held the choke and throttle open and sprayed half a can of carb cleaner into the carburetor intake. Drained the carb cleaner out after a few hours by taking the spark plug out. Be careful, carb cleaner will come pouring out of the spark plug hole.
6. Re-gaped the spark plug and scrubbed the spark plug down with wire brush and carb cleaner.
7. Performed voltage and frequency check and adjusted the main jet and governor as necessary. The main jet is just the altitude adjustment knob.
U-bolt and Bolt #1 Location: Bolt #2 Location:
It looks like I need to go get a pipe wrench or something, someone added a drain pipe so I will have to take the pipe off in order to get the generator out. The reason I'm taking it out is because the generator will shut down when my AC compressor comes on although whenever the compressor kicks on for the first time when I start the generator it'll be fine. It's when it gets to temp and shuts down and restarts does the generator shut down. To mitigate this issue on the last trip I just set the thermostat to the coldest setting and it would run fine. Any tips is appreciated.
Something else that seems odd is that I think the pipe is 1/4" NPT but I think the drain plug is in metric?
There is supposed to be a gasket between the intake fan and the metal sheet but the gasket is completely gone. I noticed some of the foam that was used on the generator is deteriorating so the foam gasket was probably sucked through the intake fan at some point. Without the gasket, hot air would be sucked in instead of the cool air from the front. I plan on fixing this with some thick high temp aluminum backed insulation. I also noticed that the storage compartment beneath the generator and the couch above it gets really warm when the generator is running. I plan on adding insulation under the couch and above the storage compartment to improve this. Cold air is pulled in from the front and goes out the hole on the bottom where the exhaust pipe is and that is blowing straight onto the storage compartment.
Float Bowl and Main Jet After Cleaning: Float: View From Air Intake: I have to say the carb didn't look too bad, I was expecting it to be gummed up from sitting around so long. Below is a thread on adjusting the carb which I'll be doing also as soon as I can get the oil drain plug back in and I'll also be adjusting the governor according to the service manual.
This is what it sounds like right now:
Let me know if that sounds and looks normal to you.
Found a tip that might be useful:
Basically remove the 2 intake elbow screws and the carburetor will come out.
- Seasoned Traveler
- Posts: 182
- Joined: Sun Mar 12, 2017 5:31 pm
- B190 Year: 1999
- WBCCI: 1422
- Location: Costa Mesa, California
Yup. That sounds pretty good. I pulled the original Onan generator on my 99’ due to it failing and installed a 2012 Onan. That was the last model year that was compatible with the generator hole on my B190. In 2013 the Onan Microlight grew an inch taller and sadly would not fit. I installed a new factory carb, fuel pump, fuel filter, spark plug and air filter and she purrs like a kitten now. I ran the generator for about 8 hours a day for a five days straight and couldn’t have been happier with the performance. There was lots of cleaning up to do after this job was finished
1999 B190 #301352
WBCCI #01422 Region 12, Unit 19
1993 b190 you need to remove the door to install it.
On my 93 anyway I was told the same thing by a few places. Industrial electric saved the day huge on the west coast electric motor and generator shop.
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