Onan Generator Hunts Under Load
Hey folks! I wanted to first offer my thanks for those of you who answered my previous post. For those of you who don't know the backstory, I bought my first motorhome (2002 Fleetwood Tioga 24d) last ...
Forum Discussion
wa8yxm wrote:
Hunting on a governerned engine is NORMALLY a fuel/air ratio issue. As i recall running rich. The Carb has two fuel metering adjustements one is for no or very light load (Idle or low speed adjustment on a car engine) the other is loaded (RUNNING or high speed) Just for the fun I googled Onan Carb adjustments and...
https://itstillruns.com/adjust-carburetor-onan-28-generator-8023075.html
Great link wa8yxm, Thanks.
Other than a misadjusted governor, I can't think of any other reason that a carbureted gas engine hunts other than running too lean, with or without a governor. The governor makes it worse if anything.
I think Cummins is between a rock and a hard place in their recommendations servicing these quieter enclosed generators, because they have to offer only an EPA approved remedy for the least of carb problems to make legally the sale. Otherwise any maladjustment immediately nullifies the rating. Since the engine has to also meet California requirements, they all do, no matter where sold.
In that context, manufacturer advice generally turns out to be an expensive new, pre-set carb that should be professionally installed/adjusted and to treat an entire 55 gallon fuel tank with anything that might help. IMO, the real solution for Cummins is to either fuel inject the engine (preferred) or run a timed cool-down fan after shutdown... to save baking the enclosed carb.
Also see Onan Microquiet 4000 Surge Fix @ https://www.youtube.com/watch?v=Ph_C6XF2TCU . That I could determine, this Jeff Berry produced the only detailed, actually useful YouTube video for fixing the surging issue on the Onan.
Wes
