Noisy Onan 4K = hack job install?
Didn't want to continue railroading the other guys thread so starting a new one. Were discussing why my Onan 4K is so noisy in my 5er and many pointed to the install and discussion around anti-vibe...
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IMO, a total hack job of installing the genny. The Onan MicroQuiet genny unit has isolation mounts that are internal to the housing so you are good there. (you can see them in your second photo) On my class A Fleetwood, the Onan 4000 genny sits in its own basement compartment mounted on a tray made of square steel tubing. The entire compartment is completely open on the bottom to let the hot air/noise/vibration out. I suspect that is part of your noise/vibration/harshness issue.
Adding some sound insulation to your compartment, opening up the bottom, then mounting the genny unit on some steel channels which mount to the sides of the compartment with additional rubber mounts between the genny housing and the tray may help. (if you have the vertical space) Don't know about the construction of the sides of your compartment but the genny weighs about 172 lbs. so they have to be strong enough to support the load. Go look at a class A MH to see how they do it. Think engine compartment in a car/truck. In most modern vehicles you can't even hear the engine when done properly. (unless at higher rpms/loads)
As a side note, if you like doing your own maintenance, I suggest you remove those silly torx screws (2) that secure the green cover (second picture) that provides access to the oil drain plug. Replace them with standard 5.5 mm internal hex or 10 mm external hex grade 8.8 metric machine screws. Then, in the future, you wont need special tools just to change the oil.
Chum lee
Adding some sound insulation to your compartment, opening up the bottom, then mounting the genny unit on some steel channels which mount to the sides of the compartment with additional rubber mounts between the genny housing and the tray may help. (if you have the vertical space) Don't know about the construction of the sides of your compartment but the genny weighs about 172 lbs. so they have to be strong enough to support the load. Go look at a class A MH to see how they do it. Think engine compartment in a car/truck. In most modern vehicles you can't even hear the engine when done properly. (unless at higher rpms/loads)
As a side note, if you like doing your own maintenance, I suggest you remove those silly torx screws (2) that secure the green cover (second picture) that provides access to the oil drain plug. Replace them with standard 5.5 mm internal hex or 10 mm external hex grade 8.8 metric machine screws. Then, in the future, you wont need special tools just to change the oil.
Chum lee
