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Tractor Talk Discussion Forum

valve guide replacement

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cjm in wi

06-13-2005 12:06:55




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I am thinking about replacing the valves and valve guides on my Farmall 504 gas engine. It smokes some on startup. I have the tractor apart for painting and figured this is the best time to do it. Is this something the average person can do themselves? Are their any special tools required? Am I better off hiring someone to do it? I know there are a lot of unknowns here but can the average person with some mechanical ability do it?? Thanks for your opinions. Also, I have an IT manual but it doesn't seem to be a very good book for this tractor, are there any other shop manuals available?

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dr.sportster

06-14-2005 12:59:19




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 Re: valve guide replacement in reply to cjm in wi, 06-13-2005 12:06:55  
Like others said it requires seat work, also as the valves sink further into the seat spring pressure is lost and shims must be added in the proper thickness.I like to wrench on things but I would leave it alone if the only problem is start up smoking.Or just do seals but possibly waste of seals and time.



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Mark - IN.

06-13-2005 17:52:55




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 Re: valve guide replacement in reply to cjm in wi, 06-13-2005 12:06:55  
Everyone's made good, sound, valid points. May just be stem seals. It's one thing to remove the springs and replace the seals, it's another to pull the old guides, ream the boss, and press in new guides. If you do that, you'll need to do the valves and seats too. If that's the case, I'd have the headguy machine them.

If you go the headjob route, don't be in such a hurry to replace the fulcrums, unless they're worn, and then only the worn ones, if any at all.

Mark

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Rod F.

06-13-2005 14:53:08




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 Re: valve guide replacement in reply to cjm in wi, 06-13-2005 12:06:55  
I doubt that I would even bother doing it. So it smokes a bit when it's cold. Unless there is another pressing reason, I would leave well enough alone. If I was a bettin' man, I would say that tractor will give a lot of trouble free hours of service before it needs valves. Choice is yours. FWIW.

Rod



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Aussietractor

06-13-2005 14:33:25




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 Re: valve guide replacement in reply to cjm in wi, 06-13-2005 12:06:55  
cjm. Unless you have access to specialised tools,and equipment, and know what you are doing, it is best to take the cyl head to a machine shop and get them to do it properly. The head will have to be dismantled, cleaned, all parts inspected for wear,and cracks.
Then if the guides are to be replaced they are are usually pressed out and new ones installed and will need to be reamed for correct clearences. Valve seats will HAVE to be recut. The head may also need to be planed. Some jobs are really better off being done by experts. I,ve seen many of these types of job that go wrong and then they still have to be taken to an expert, and it can also end up costing much more if you don't get it right the first time. With this sort of repair it is really a case of, what you pay for is what you get. Good luck.

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J. Schwiebert

06-13-2005 12:33:49




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 Re: valve guide replacement in reply to cjm in wi, 06-13-2005 12:06:55  
Once you replace the guides it would be best to grind the valve seats as the new guide may not be concentric with the valve seat. Check your valve springs while you are at it. When you disassemble the head measure the clearance. Maybe the valve stems are worn, maybe valve seals such as a Perfect Circle seal is your solutions. You need to take some measurements first. Questions?



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