When installing adjustable push rods as general rule how much do I need to grind off the valve stem?
It depends on your camshaft, and the condition of the valve seats (ground seats will allow the valve to sit lower).
.050 to .100 thousands is the usual range.
I first made the push rods all the same length by the adjust bolt half way up. Than I put the push rods and the camshaft in the engine and slide the valves in there places. Turn the camshaft one revolution and each valve and push rod must follow the way down. The distance each valve will stay of his seat is the minimum size you need to grind of the valve stem. Final play between the rod and the valve stem can be set by the adjust bolt and nut.
Stock Model T's have Tappets, or lifters, same thing.
Over head's valves in head, have push Rods.
Mr. Kohnke - Original manuals and other Ford publications from back in the Model T era actually called (what we call tappets) "pushrods". I remember distinctly that the first time I ran across a Ford manual that called the tappets "pushrods", it was confusing to me. I still think it's weird, but that's what they called them,.......harold
You can also call them cam followers.
Well, Mr. Schwendeman, in a valve train on an over head, such as Ra-Jo, you have, from Top to bottom in the valve train.
Valve, Push Rod, lifter, and Cam.
You don't have Valve, Push Rod, Push Rod, and Cam.
I haven't looked at only two Vender's parts books but Langs call them push rods as per parts book, and Snyder's call them by there right name Tappets.
All the tappets, or lifters I have ever ordered, always say Tappets, or lifters on the box.
If you don't use the correct names, it gets confusing, like turning a Hog loose in a round Barn, as he would go crazy looking for a corner to S+%# in.
Sounds to me like the man that made them could call them anything he wanted to. In this case I'll bet it comes from steam engine terminology, some thing that Henry would have been very familiar with. Really not worth starting an argument over!
The Ford shop manual calls them pushrods.
It used to be simple, but now I see that a tappet can also be a pushrod so it follows that a pushrod can be a tappet. Therefore, they're both the same.
Im sure everyone understood my question ... Howard is right...its not worth a argument . Thanks to those who help newbies ike me.
Royce,......thanks,.......I was merely trying to say that Gary Gregory's use of the term pushrod probably stems from Ford's original use of the term,.....I certainly wasn't trying to start an arguement. Sheeeesh!
Mr. Kohnke,.....I really didn't want to argue,.....sorry if you were offended when I tried to explain what might have been the reason for Gary's use of the name pushrod for the tappet or cam follower. I suppose if I wanted to argue, I could mention that when you advised us all of the components of the valve train in an overhead valve engine, you also have a rocker arm, which I consider to be part of the valve train. Maybe you were listing your knowledge of the components of the valve train in a flathead engine such as the Model T by mistake! But then this is silly,......and I'm really not just trying to be argumentative or to display my vast knowledge of internal combustion engine terminology! In fact, I'd be the first to say that I have a lot to learn,.....trouble is, at my age, I seem to forget some things faster than I learn new ones!
The reason you are using an adjustable tappet in the first place, is so you won't have to grind anything from the valve stem.
If you call a tail a leg, how many legs does a dog have?
Even with adjustable lifters if you have new valves you still have to shorten the valve stem.
In my 1918 Dyke's and my 1920 6 volume set of Automobile Engineering it calls them tappets, pushrods or valve lifters so apparently during the Model T's service life pushrods was an acceptable term.
Larry...you still have to grind the stem.
With a regound camshaft & adjustable lifters, no valve stem grinding is necessary
(With a regrind, a 7.5 degrees advanced timing gear is often preferred for better hill climbing)
Perhaps you are using the wrong valves!
Got them from Langs...they told me need to grind the stems.