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Valve guide removal

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Rob

02-06-2002 10:55:03




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My slow tear down of my 49 8N continues. This past weekend I was able to get the valves out finally. (Newer style valve train.) Didn't use the same type of valve spring compressor they show in the FO-4. Getting those keepers out alone can be a real bear! It will be interesting to see how the new ones go back in, as they pretty much got ruined taking them out. In only one case did the guide come out with the valve. Given the limited area with which to work in there, what's the best way to get the rest of them out? I can envision some sort of a screw jack operation, working in the opposite direction of the spring compression tool shown....

I'm sitting here with the flu, my tractor is 100' away in the barn, and this is as close to working on it as I feel like doing today. D**nit!

Thanks for the input.

Rob

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Rob - Thanks Guys

02-06-2002 13:13:41




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 Re: Valve guide removal in reply to Rob, 02-06-2002 10:55:03  
Wish I'd have asked or searched first - it sounds like I would have saved myself some headache.

The manual isn't clear that you need to pry the guide down first, but in retrospect it sure makes sense. Oh well, first ever engine rebuild, learning a lot about what not to do on the next one in the process!

Thanks again.

Rob



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ZANE

02-06-2002 12:32:26




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 Re: Valve guide removal in reply to Rob, 02-06-2002 10:55:03  
If they were installed right with only the intake having the guide seal installed and the exhaust not installed the exhaust will usually come out easy and the intake will give you HE double hocky sticks.

Fabricate a tool from an old tire tool that has been heated and straightened. Grind the end down until it is about 1/2" diameter about 2" from the end. leave the very tip this diameter for about 3/8" and then behind the end on only one side grind about a 1/8" indentation in the bar so that it is long enough to clear the outer edge of the valve port when you pry the guide down. When you have pried the guide down about 1/4" the keeper will easily come out. Do not pry or pull it out with much force or it will be destroyed. Usually it can be done with the fingers.

If you have a pneumatic chisel you can then use it to drive the valve and guide assembly out the top by placing the chisel on the top end of the valve spring. Don't worry, you won't damage the spring. It is tough enough to take it. You can also do it with a hammer and chisel the same way. When you get the assembly out you can then dissasemble it to do what ever you want to.

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raytasch

02-06-2002 11:14:37




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 Re: Valve guide removal in reply to Rob, 02-06-2002 10:55:03  
Rob, Get well!
Almost sounds like you are not getting the guides loose in the block before trying to get the retainer out. If you don't get the guides loose you will destroy the retainers. Tap the valve guide assembly down from above by tapping, forcing it from under the valve head. Once you get the guide loose and pushed down slightly the retainer should almost fall out. The guide, springs, keepers come out as an assembly and go back in as an assembly. Many years ago I had an old mechanic tell me that "If it is hard to do you are probably doing it wrong". Should be a lot of information in the archives on this.
ray

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Greg

02-06-2002 11:06:07




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 Re: Valve guide removal in reply to Rob, 02-06-2002 10:55:03  
Rob,
I used a large flat blade screwdriver in the ports to pry the guide down. Then you pull the retainer out and tap the whole assembly up and out the top. The new ones can be assembled first then installed in reverse order.



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