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Liberty work shop

Help with 520H surging ...

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Liberty work shop

The Onan on my 520h does this " surging thing " from time to time . Anybody have any thoughts on how to fix it ?? Thanks , Jerry ...

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Snoopy11

What RPM is this mostly occurring? :confusion-confused:

 

The idle jet tube is more often than not the issue. Cleaning is in order. The jet has small pin hole orifices and once plugged up the engine will hunt at times.

 

Intake leaks can also cause this... and the best way to check is to spray carb cleaner around the intake side... if the engine changes pitch in any way... you have a leak. I only recommend doing this on a cold engine though...:handgestures-thumbupright:

 

Don

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Liberty work shop

Well , I decided to do what many others have done , and that is to replace the carb ... I do have one question though ... The intake manifold on this is two piece ? When i'm cleaning things up , should this be taken apart and resealed ? If so where can I find the gasket for it and what holds it together ? Thanks , Jerry ...

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lynnmor
2 hours ago, Liberty work shop said:

Well , I decided to do what many others have done , and that is to replace the carb ... I do have one question though ... The intake manifold on this is two piece ? When i'm cleaning things up , should this be taken apart and resealed ? If so where can I find the gasket for it and what holds it together ? Thanks , Jerry ...

There is a thread right above yours detailing how the intake manifold can be sealed, look for the .PDF file.

Gaskets can be purchased from onanparts.com, do not use anything other then genuine Onan gaskets for the intake, some cheap Chinese gaskets deteriorate within a year.

We don't replace carburetors with cheap Chinese junk unless there is no other option.

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