compression numbers...

Our 1952 8n was needing some work, and while we had the hood off (cleaning out the gas tank) we did a compression check.

My 1948 8n had pretty standard compression, between 100 and 105 on all 4 cylinders.

This 1952 had the following numbers--but let me admit that my son did the check and I failed to have him remove all of the plugs at once, so these numbers could be bogus.

Cylinder 1 ... 117 pounds
Cylinder 2 ... 110 pounds
Cylinder 3 ... 90 pounds
Cylinder 4 ... 107 pounds


I realize that 90 pound number is out of bounds... but the other three seem higher than the book which I have says they should be. We did not wet test the 90 pound cylinder (cylinder 3).

This tractor has had a tendency to put a little oil into the cooling system for the 2 or 3 years I've had it. So maybe the 90 pound compression number is a clue there...

Is it normal to have compression at 110, to 117 pounds?

I obviously got the tractor used, and I have no idea what has been done to it over the years.

We did do a bit of bush hogging with it today, and it ran the 5 foot Woods bush hog just fine (Woods says that model should have a 30hp minimum tractor to run it). But ours worked fine.

Dan
 

hi dan :)

not sure what book you're looking at, but those numbers from 107 to 117 are fine. iirc, conventional wisdom says rebuild when all are ~ 90 or lower, and after being freshly rebuilt, they should be ~ 125.
 

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