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Ferguson Valve Seals

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Phil

04-04-2000 07:23:46




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I'm going to replace valve seals on TO30. I know to put air on cyl. to hold valve up. Once I compress spring I can get pin out and loosen spring retainer cup, but there isn't enough clearance to slide retainer cup off between valve stem and rocker arm. Do I need to remove rocker arm assembly, or can I push valve stem down (against the air)? I was afraid to push valve down without asking as that might break seal and valve might drop? Thanks.

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Phil

04-11-2000 07:15:23




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 Re: Ferguson Valve Seals in reply to Phil, 04-04-2000 07:23:46  
Thanks, fellows for your responses. I got the job done. Had to loosen the rocker arm (four bolts) enough to get clearance to remove the cup. Did not remove rocker arm. Replaced the seal easily. Old one on one cylinder was loose on valve shaft and obviously bad. Now plug doesn't foul. This TO30 will outpull my Jubilee. Still smokes some, but it runs outstanding. When I pulled valve cover I found previous owner had put gasket over breather port, and valves had condensation on them. So I fixed that and did two good deeds with one job.

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Keith

04-09-2000 10:23:14




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 Re: Ferguson Valve Seals in reply to Phil, 04-04-2000 07:23:46  
Have you tried depressing the valve assembly far enough to get the pushrod out? With it removed the rocker arm should move out of the way enough to get the spring off. Then the air pressure can be applied to hold the valve up as you compress the spring. If not, then the rocker arm assembly will have to be removed. It is not a bad practice to clean out the rocker arm while it is exposed. The rocker arm tube is hollow and tends to collect oil sludge in it that plugs the oil passages to the rockers. This is especially true on the outer ends. There are aluminum caps on each end of the tube that are removeable. Be careful as they are aluminum and can be stripped if not removed properly. Good luck.

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lars

04-10-2000 08:42:02




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 Re: Re: Ferguson Valve Seals in reply to Keith, 04-09-2000 10:23:14  
how do you remove the caps.tried when i rebuilt the engine on my TO-20 and wasnt sure how to get them off, so i didnt remove them just cleaned them as best i could by flushing them in a parts cleaner



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Phil

04-11-2000 07:17:23




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 Re: Re: Re: Ferguson Valve Seals in reply to lars, 04-10-2000 08:42:02  
My cups just slid right off. They were not fastened, just sitting on top of valve stem.



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lars

04-11-2000 09:20:09




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 Re: Re: Re: Re: Ferguson Valve Seals in reply to Phil, 04-11-2000 07:17:23  
i didnt mean the caps on the valves, mine came right off also. the caps on the end of the rocker arm assembly. wasnt sure how to remove them so i didnt. i was able to move the rockers to access the oil hole and flush out the rocker shaft, but would have liked to get the ends off to do it right



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Keith

04-12-2000 21:12:34




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 Re: Re: Re: Re: Re: Ferguson Valve Seals in reply to lars, 04-11-2000 09:20:09  
I bought a 1948 TE20 a couple of years ago that had been setting for three years. It was pretty rough and I decided to overhaul the engine. The first time I pulled the pan off, I was looking at an oil sludge nightmare. I found several areas that oil sludge had created real problems. One was the long oil passage in the block. Another was the camshaft oil passage to the front bearing that is in the camshaft itself. The final place was the rocker arm assembly. The oil sludge formed hard plugs in the ends of the assembly that required punching out. It deprived my outmost rocker arms of oil and subsequently they were worn more. The tractor had been operated without a thermostat for years and the result was a mountain of sludge. Your tractor may not have the same amount of sludge, but it doesn't hurt to clean what you can when the opportunity is there. To remove the caps I heated the ends till they were warm (not hot) to the touch. Aluminum breaks loose easier if it is warm. Then I used a good six point socket and applied steady pressure until it gave way. Once broken loose booth ends unscrewed easily. You would need only one end off if the buildup is light. Your heart may skip a beat when it gives way as aluminum generally "pops". I don't think you will have a problem if steady pressure is applied. One end may be easier to loosen than the other and one end open would still allow for cleaning. Good Luck, will answer any other questions as I tore my tractor down from one end to the other before it was all over.

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