I'm stuck. No endplay on 70 diesel

Opposable

New User
I'm having the opposite problem as rick deere. I have the new style oil slinger (A21950R). The flywheel came loose, so I tore everything apart.

The woodruff key is broken right as it sticks out into the crankshaft thrust plate. How important is it that the crankshaft thrust plate sits on that key?

The pin on the thrust plate cover that holds the thrust washer locater in one position is broken. How important is it that the thrust washer locater stay in the same position?

Additionally, I cannot get the crankshaft to measure endplay unless the tractor has been running. What am I missing? If I put 0.04" of shims behind the thrust plate, no endplay is measured, but if I start the tractor, I get > 0.035" of endplay after it has been running.

Thanks in advance. When the flywheel came loose, I believe there was very little endplay, practically none that I could feel in the hand clutch, which is probably why the woodruff key and the pin were broken off.
 
Been years since I was into one but I do remember that pretty much every 720 diesel I was into had a mismatch of parts in there for the end play and thrust washers. There were several parts changes over the years you have to take a lot of time and sit down with the parts book right in front of you and go over it. I remember on one in particular I had a really hard time keeping it all straight and getting it straight.
And if you are missing something that was to be in there remember it was in there for a reason and should be put back in there.
 
That's a good point Mike, I went ahead and tore it all apart, replacing the woodruff key and the pin. The biggest question I have is how do you actually check for endplay?

I followed the directions in the service manual, put the spacer on, dial gauge on the end of the crankshaft, etc. How do I get the crankshaft to move side to side in this configuration? If I put the flywheel on and start the tractor, it loosens everything up that I can check endplay after it runs, but I want to try to avoid heaving the flywheel on a bunch of times.

I've tried leaving it in gear and moving the hand clutch forward and back (without disengaging) but I just cannot get the crankshaft to move side to side. What am I missing?
 
On those early ones that adjust with shims I think the I & T book shows making a spacer to install in place of the flywheel for trial and error purposes. I made one from exhaust tube. Book should give a length to make it. You draw the spacer up tight with the little tin lock nut on the crank end. Then end play is adjusted with shims I think behind the slinger plate. Been years since I dealt with one of those.
 
Your memory serves you well Mike, that is exactly what I have done. Once the spacer is on and the shims are on, I just can't get the crankshaft to move side to side to actually measure endplay.
 
Then it sounds like you need more or less shims whichever gives you more endplay. Isn't there some big fibred washers in there ? Maybe one dropped out of place ?
 
Update: This was a matter of not enough shims. I had to add almost 0.06" of shims to get endplay at all (there was only 0.005" worth of shims on there when I took it apart). Currently I am at around 0.015" of endplay with everything on and tight. I know spec is 0.005" to 0.010", but I've also heard that running them a little loose isn't terrible. Is 0.015" too much?
 

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