Low compression

[Malcolm Towrie]

Originally Posted by rob love

A valve job in the original form is a big deal. You grind the valve and the seats,, then you grind the stem of the valve to get the right clearance. You can install adjustable valve lifters (I think they originally come from one of the old 8N Ford tractors but don't quote me on that). That will make it a lot easier to do the adjustment, but it requires removal of the cam I think, which is not something you are going to do in-frame.

Can't say I have ever had a problem with bent valve stems on a Ford.

I can see some hassles with doing a valve job then!

So how do shops grind the valves with their mushroom tips? The seat grinders I have seen chuck the valve stem.

And grinding seats in the block must require a tool that locates in the guide bore? Sounds specialized. And nasty if you spread grinding debris around the valley.

Malcolm

[rob love]

Grinding seats is not that messy. Lots of rags in areas you want to protect. Some of the older manuals will show a cutter to reface the seats, but for the last 70 years or so they are done with specially designed grinding stones. Seems like we rarely to never need them for the modern engines, since the computer keeps everything so clean and the fuel mixture just right. I bought a complete valve grind set-up because I have more old engines than new ones.

[Malcolm Towrie]

I found this for grinding seats in the block. Neat how the pilot locates in the guide bore and the lifter bore. I guess this is what you have?

https://www.youtube.com/watch?v=QDEJ3coQa14

I'm still curious about refacing the valves. The refacing tools I have seen look like this, with a collet chuck holding the stem. How is the flattie valve held with the mushroomed tip?

VKM_2-grau.jpg

[rob love]

Open the collet further, slip the valve in, and tighten the collet on the straight part of the valve stem.

The valve grinder puts the stem against the side edge of the stone.

Yes, the valve grind kit I have is essentially the same (mine is snap-on) as that shown in the you-tube video. Their guide tool is a bit more specialized than the ones I have, but certainly a good idea to get the valve seat bore aligned to the lifter. I take exception to them describing the tools as obsolete or antique. Those are what I learned on.

[Malcolm Towrie]

Originally Posted by rob love

I take exception to them describing the tools as obsolete or antique. Those are what I learned on.

Ouch. Touched a nerve, did it?