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Garden Tractors Discussion Forum

deere 318 onan b series

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dbrojr

04-22-2014 04:39:31
184.8.186.90



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lost left cylinder....seems to fire intermittently changed plugs,resealed intake,cleaned points and no arching, 90 psi compression in both cylinders...plug is dry after running and white.will run with left plug wire unhooked, but wont run with right side unhooked.does has over 30,000 hours on it.was used for over 10 years to mow 35 acres running non stop for 6 days a week/10 hour days.seems like it isn"t pulling gas into left side.exhaust does have an eye burning gas smell though.any ideas.ran fine last time plowed snow.

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dbrojr

05-01-2014 04:54:44
184.8.183.42



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
drained gas and put in fresh.....seems to run fine now...will see when I get the deck on it.



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traper

04-22-2014 15:59:37
108.16.138.12



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
try new condenser had that condition before
traper



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D beatty

04-22-2014 12:24:09
24.12.128.33



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
I would say with 30,000 hours that you are ready for complete rebuild or replacement.



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t.r.k.

04-22-2014 08:41:48
24.74.85.78



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
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
166.181.83.90



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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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dbrojr

04-22-2014 13:57:35
184.8.183.42



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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
166.181.81.9



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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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Steve@Advance

04-23-2014 20:37:12
107.203.134.67



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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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dbrojr

04-24-2014 05:16:37
184.8.183.42



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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 intake..no leaks found..no change....checked carb as well.



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Roger in Iowa

04-22-2014 06:59:39
166.181.82.139



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
Any fire at the left hand plug wire??



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dbrojr

04-22-2014 11:16:17
184.8.183.42



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 Re: deere 318 onan b series in reply to Roger in Iowa, 04-22-2014 06:59:39  
spark looks good....cranked over w/ intake and exhaust removed and valves are moving,havent pulled head yet to check valve seats...upper bolt in head gonna twist before it comes out ,i'm afraid.repower not in the budget...gonna sell it if comes to that...was my dads,so hate to get rid of it.



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El Toro

04-22-2014 06:48:53
96.244.7.206



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
It's probably time to replace the engine with a new short block if they're available. Hal



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rusted nuts

04-22-2014 06:14:03
173.189.135.186



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 Re: deere 318 onan b series in reply to dbrojr, 04-22-2014 04:39:31  
Cam wore out? Not opening the intake valve.



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504

04-22-2014 20:48:00
199.127.54.155



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 Re: deere 318 onan b series in reply to rusted nuts, 04-22-2014 06:14:03  
I had one that the plug wire was burned internally, I cut the wire and reinstalled the end and it was fine. One other thing to try is take the wire off of the plug but leave it close to the plug, if it runs you have found a bad plug, or wire.



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