valve guide question

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steves49
Posts: 20
Joined: Sat May 29, 2021 6:03 pm
Zip Code: 33952

valve guide question

Postby steves49 » Fri Jun 11, 2021 8:06 am

I'm replacing valves in my 49' and not sure best way to remove old guides. working from top as i still have crank and cam in place, first time doing this and don't want to break anything, Thanks!

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Glen
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: valve guide question

Postby Glen » Fri Jun 11, 2021 6:25 pm

Hi,
Below is the Cub service manual, if you don't have it. It has lots of info.
There is contents beginning on page 1 of most sections.
I would read section 1, the engine section, since you are working on the engine.
The valve guide info is on pages 1-20 and 1-21, it shows.

http://farmallcub.com/rudi_cub/www.clea ... index.html

Page 1-7 in the manual gives specifications for the valve stem clearance in the guides.
Sometimes the valve guides are not worn much, you don't need to replace them if they are still good.
I would measure the clearance and see if the guides are still good.

They have said on here before that after putting in new valve guides, the holes in them need checking and reaming if too small.

I remember someone on here was having trouble after a rebuild, one valve would stick when the engine warmed up, the hole in the guide was evidently too small.
There are some posts near the bottom of this page, at Similar Topics, if they show on your computer or phone, that might help you.
Good luck. :)

tractorpoor
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Tractors Owned: 26 Cubs (49-79)
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Re: valve guide question

Postby tractorpoor » Fri Jun 11, 2021 7:57 pm

Look in the how to forum under engines.


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