Onan 5500 wont start ... runs ok once going
My Onan 5500 wont start anymore. Been messing with it and figured out it is rich/not getting enough air. Have it narrowed down that if I slide the intake butterfly position lever so that it is open a ...
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The butterfly valve you are referring to is the choke, which is usually operated by a bi-metallic spring. When the engine is cold, the bi-metallic spring holds to choke closed so that the engine gets some extra fuel for starting. The lever you refer to is connected to a vacuum operated diaphragm which is supposed to pull the the choke open somewhat as soon as the engine starts to allow additional air. The bi-metallic spring then slowly opens the choke the rest of the way as the engine warms up.
With the engine cold, the choke should be closed and if opened by hand should spring back to the closed position when released. If this doesn't happen, the bi-metallic spring may have failed or a linkage has become disconnected.
You should also see the diaphragm pull the choke open when the engine starts. If this doesn't happen, there may be a hole in the diaphragm.
With the engine cold, the choke should be closed and if opened by hand should spring back to the closed position when released. If this doesn't happen, the bi-metallic spring may have failed or a linkage has become disconnected.
You should also see the diaphragm pull the choke open when the engine starts. If this doesn't happen, there may be a hole in the diaphragm.
