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Re: Who loves and understands their Original Onan ? [message #365608 is a reply to message #358769] Wed, 21 July 2021 15:07 Go to previous messageGo to previous message
rgogan is currently offline  rgogan   United States
Messages: 82
Registered: February 2004
Location: Milwaukee, WI
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More Onan problem solving steps:

1)I always thought that my Onan would shut down in hot weather from overheating but vapor locking the fuel line, fuel pump or carb. However forum members would talk about crossing the desert with both overhead A/C units running and no Onan shut down.
Ultimately found the the clear fuel line purchased as a replacement from Cinnabar had developed micro cracks. When cold the vacuum on the fuel pump would work to fill the carb. When the engine compartment heated up, the clear ?vinyl ?plastic (certainly not silicone) fuel line cracks would open up and air would be sucked into the fuel pump. Now I use plain old black rubber fuel line and my generator never shuts down in the heat.

2) My Onan carb would run great just after the load run jet needle was adjusted, but within a few days it was running poorly again.
This was difficult to figure out, but I found the O-ring on the needle jet adjusting screw was worn out and despite sealing against fuel leakage, it was not protecting the needle from getting out of adjustment from the engine vibration. New O-ring installed and the needle keeps its adjustment about 2.5 turns off the base.

3) bridge rectifier blowing out. This has not happened again since I was warned about shutting the gen set down before turning the load off.

4) starter motor bracket breaking off. If your generator bangs around making all kinds of noise on shut down, the generator bracket is about to fail since it is making the noise. Put new rubber engine mounts in because the old ones have failed or lost their clearances.

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