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Re: deere 318 onan b series

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Author  [Modern View]

04-22-2014 08:41:48

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The last 2 onans that I worked on that would only run on 1 cylinder had valve seat problems.

One would actually fire the cylinder where the seat was almost in the intake port, but would not fire the cylinder where the seat was loose.

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Roger in Iowa

04-22-2014 13:25:36

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 Re: deere 318 onan b series in reply to t.r.k., 04-22-2014 08:41:48  
With 90 psi in both cylinders, how can valve seat be bad?

Check ignition again to verify fire to cylinder...

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04-22-2014 13:57:35

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 Re: deere 318 onan b series in reply to Roger in Iowa, 04-22-2014 13:25:36  
spark will jump a 3/4 inch gap w/ bright blue spark...switched plugs from side to side,no change...seems to be a fuel issue...if I flood it out for a sec both cylinders will fire for about a minute,then back to missing.

thanks for all the responses...

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Roger in Iowa

04-22-2014 14:37:22

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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 13:57:35  
Sounds like you have an intake manifold air leak causing left hand cylinder to run very lean.

Spray some starting fluid around left hand intake manifold when running to see if it finds the leak inward. Be careful!

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04-23-2014 20:37:12

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 Re: deere 318 onan b series in reply to Roger in Iowa, 04-22-2014 14:37:22  
Second the vacuum leak.

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04-24-2014 05:16:37

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 Re: deere 318 onan b series in reply to Steve@Advance, 04-23-2014 20:37:12  
removed intake and found a stripped bolt...fixed bolt and resealed leaks change....checked carb as well.

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