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Rough-Running 335

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Jim H.-Thanks,

12-23-2000 10:48:20




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Thanks to all for tips earlier this month. The carb has been rebuilt, electrical systems checks out ok. The tractor fires on all cylinders but doesn't have much power. In comparison to my farmall M, the 335 governor takes way too long to recover the rpm's when going under load. Then it almost dies unless load is removed. We are using it to push snow, nothing out of the ordinary. Air cleaner is unhooked. We have tried adjusting the high idle, seeing a difference in the exhaust but no gain in power. Mechanic had us vacuum out the intake manifold in case something crawled in there, nothing came out.

Any more ideas? Thanks and Happy Holydays, Jim

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philo-mm

01-08-2001 09:04:16




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 Re: Rough-Running 335 in reply to Jim H.-Thanks, Help! and Happy Holydays, 12-23-2000 10:48:20  
check your governor linkage to make sure it is correct. I have a 335 that ran less than optimal and then I adjusted the rod on the governor.

philo-mm
maybe check your air cleaner



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Dirttracker

12-23-2000 18:34:54




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 Re: Rough-Running 335 in reply to Jim H.-Thanks, Help! and Happy Holydays, 12-23-2000 10:48:20  
One thing you need to check is the mechanical advance in the distributor. Without routine care the advance will rust or sieze on the shaft causing the engine to run badly because the timing won't advance as the engine RPM's increase. You can check it easily by pulling the cap and see if the rotor shaft will move on the distrubutor shaft. Mine was froze up and the distributor needed some work. Makes all the difference. The advance curve is in most repair manuals. A distributor machine is the best way but you can use a tachometer and timing light and set it while its in the tractor (not as easy), also on delco distributors there is a limit pin in the advance system that initially has a rubber bushing on it, after years go by the rubber bushing will break and fall off, that allows the advance to much travel which gives to much timing. If you set the total advance and advance curve close to factory specs and everything else is ok, these 206 cu in engines run very strong.

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BMG

12-23-2000 17:40:00




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 Re: Rough-Running 335 in reply to Jim H.-Thanks, Help! and Happy Holydays, 12-23-2000 10:48:20  
Jim, it sounds like your timing may be off. Have you checked the distributor timing at the flywheel? Have you done a compression check on the cylinders to look for any leaking valves? Have you checked the governor linkage for any binding? Have you checked the governor adjustment? I know you can't replace the governor without tearing down the motor but it seems like there is a way to check the governor setting but I'm not sure of the process.

Brian

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Jim H.

12-26-2000 08:24:53




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 Re: Re: Rough-Running 335 in reply to BMG, 12-23-2000 17:40:00  
Thanks for the tips. We looked at it again. Governer linkage was unhooked and sticking somewhat. Used a bunch of Boeing t-9 on it. It is running better. High idle is 3 turn out, low is 2 turns. I still think it is a little slow at recovering inder load. We will probably check the timing advance next, when it warms up a little.
Jim



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