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Mitey Mac onan surges?
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<blockquote data-quote="LeoB" data-source="post: 124481" data-attributes="member: 21523"><p>Foton is correct. Your issue could be engine is starving for fuel due to dirty fuel filters. At idle, the clogged filter may be able to supply enough fuel for smooth operation, but at higher throttle, it can't. And he is right about the governor tension spring, it controls engine speed. When you increase or decrease engine RPM on an ONAN NHC used in the Hydra-Mac 8B, you are telling the governor to run the engine at a certain speed. The governor then controls the throttle plate. Attached are pages from an ONAN NHC service manual for the carb and the governor areas.</p><p></p><p>My NHC has an electric fuel pump and external filter feeding the carb. You might start by pulling the fuel line after the filter. On my unit, when I turn the key to the "run" position before I turn the engine to start it, the fuel pump runs. Assuming your unit is the same, check the fuel flow first. Then perhaps graduate to the governor. My two cents worth. </p><p></p><p>Leo B.</p></blockquote><p></p>
[QUOTE="LeoB, post: 124481, member: 21523"] Foton is correct. Your issue could be engine is starving for fuel due to dirty fuel filters. At idle, the clogged filter may be able to supply enough fuel for smooth operation, but at higher throttle, it can't. And he is right about the governor tension spring, it controls engine speed. When you increase or decrease engine RPM on an ONAN NHC used in the Hydra-Mac 8B, you are telling the governor to run the engine at a certain speed. The governor then controls the throttle plate. Attached are pages from an ONAN NHC service manual for the carb and the governor areas. My NHC has an electric fuel pump and external filter feeding the carb. You might start by pulling the fuel line after the filter. On my unit, when I turn the key to the "run" position before I turn the engine to start it, the fuel pump runs. Assuming your unit is the same, check the fuel flow first. Then perhaps graduate to the governor. My two cents worth. Leo B. [/QUOTE]
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