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Harry Ferguson Tractors Discussion Forum
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TO 35 breaking rotor button

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dudley

08-04-2003 07:41:36




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Have TO 35 with continental engine breaking the contacts off the rotor button every hour or two and showing unusual wear in distributor cap. Replaced distributor cap twice to rule out possible wrong one, dissasembled distributor and found no problems but can hear distributor clunking when running and see new wear on the camshaft gear. Distributor turns freely when out of block by hand, but acts as if the distributor shaft is being pushed upward when running or engine cranked over with cap off. Can this be possible bad gears on distributor and camshaft or possible bent camshaft or what else? Any help is greatly appreciated.

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TO-35Man

08-04-2003 16:18:35




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 Re: TO 35 breaking rotor button in reply to dudley, 08-04-2003 07:41:36  
I have ran into this problem a few times....and found three things causing it... bent Dist.shaft or loose bushings ,Cam thrust plate,Governor race and ball driver nut loose.
If your dist. is in tollarances you need to check for cam walk most of the time you can turn engine with dist. out and watch cam as it turns if it moves enough you can see it the cam plate is worn out or plate srcews are loose...if not you need to check governor ball driver assembly. To check these you'll have to remove front engine cover. assembly and disassembly are coverd in the shop manual I have never seen a bent cam....but have seen some really worn out...
hope this helps...

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Duner Wi

08-04-2003 11:39:10




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 Re: TO 35 breaking rotor button in reply to dudley, 08-04-2003 07:41:36  
There should be something in the archives on this problem. Does your govenor work as it should? Seems in the past this has been a problen with the cam retaining system getting loose and the cam then bounces fore and aft doing strange things to the dist. I myself have not had this problem but am working from memory from reading this board for quite some time.



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Clint

08-04-2003 11:30:24




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 Re: TO 35 breaking rotor button in reply to dudley, 08-04-2003 07:41:36  
I have a TO-20 which did the same thing last year and this year as well, last year it was the shims inside the dist. that had worn out, and this year it was a washer in between the shaft and the dist. housing that had worn.



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James, UK

08-04-2003 08:33:49




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 Re: TO 35 breaking rotor button in reply to dudley, 08-04-2003 07:41:36  
Sounds like badly worn thrust bearings in the distributor, leading to the shaft lifting, possibly rotating eccentrically, leading to broken rotor button.

Solution is to have the distributor rebuilt, or do it yourself.



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dudley

08-04-2003 08:48:00




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 Re: Re: TO 35 breaking rotor button in reply to James, UK, 08-04-2003 08:33:49  
Checked those and are tight with little to no shaft end play in distributor. Not sure what else it could be.



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Batman

08-06-2003 03:40:17




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 Re: Re: Re: TO 35 breaking rotor button in reply to dudley, 08-04-2003 08:48:00  
If it is breaking the button, it must have some play in it - try to check far axial movement, or truth of the distributor shaft (ie is there any runout). As TO-35Man said, there may be cam trouble, but for that to mess your distributor, there must be movement in the distributor mechanism, too.

The button is spring loaded, so should be able to absorb some 'vertical' movement - radial/axial movement though, will not be tolerated as well, if at all, as the button is made of a relatively fragile/brittle carbon compound

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