New valve guides help?

C

captain j

Member
I'm in the process of putting in the new Modern style valve guides and valves. The old guides were 2 piece and the new ones are a one piece style. I'd there a trick to getting them seated into the block? I don't want to pound on them and cause damage. I tried some heat on the guides but still not going in.

Thanks josh
 
Oooohh. They are a press fit which is why you are having problems. We actually use a special tool designed specifically for installing guides that is powered by a 2X rivet gun. After the guides are installed, a special reamer is used to ensure the upper area of the guide has not been damaged during the installation. If this step is omitted, then either the valve stem will not slide cleanly into the guide, or it will gall the edges of the stem. My suggestion is either purchase the proper tools, or take it to a qualified shop that has the capability to do the job correctly.

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You can make your own installation tool if you have a lathe. It is merely a steel punch that fits into the guide and has a square shoulder that presses on the top of the guide. I use a large hammer because that is what I have. A reamer will likely be needed after installation. The tool must fit somewhat loosely in the guide as it shrinks a little when installed.
 
If one were to make it out of brass and relieve the corners at the pilot, would the reamer still be necessary? I would use a 5/16 ths (,3125) reamer, is this adequate?
Terry
 
It is always a good idea to pass a reamer through the guide after it is installed. This removes any interference from distortion created when installing and the possibility of an undersized guide from the supplier. If you do not do this step, you risk a sticky valve...and that is no fun to deal with.
Good Day!
 
I Freeze the guides in the fridge with the ice cream then install 1 at a time leave the others in the fridge
 
For the tool challenged, I have been known to drop a 2" 5/16 bolt into the guide and drive it in with a 6" X 1/2" steel drift and a 2# hammer. You will have to run a 5/16 drill bit about 1/4" into the guide when it is installed to cure the deformation at the top where the bolt head is.

Before anyone shoots me for even implying this, I don't do it this way because I have the same tools Brent does but this way has served shadetree mechanics since the inception of the one piece guide.
 
Along with what everybody else said, I would not use heat on the guide. That will expand it and make it larger and harder to fit into the guide bore.
 
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