At the Cat dealer we used the ball hones when they came out and I liked them best of all types for breaking the glaze and that,s all that,s needed.Cat sold them but auto parts shops should have them. You need one to work in the bore diameter. Normally if pistons aren,t scored or ridged then they usually are ok to use again.The ring lands are important to be checked for side clearance of the rings when they are in place.You can pretty well tell if a piston is not serviceable again just by inspecting it visibly.

SJ - thanks for the advice on the hone, but i do like the stones because they are easier to handle/replace. will it do? I read stuff about the sleeves being tough as kryptonite too as Mike mentioned...but i just need to clean them up and break the glaze. Will it do the job??

oh by the way, i pushed the d2 with my neighbors tractor a little to make sure the UC is ok, it moves pretty freely, i engaged the tranny to the motor to try and turn it over, i was able to make the motor turn over a little before it freezes on me, the head is obviously removed so that removes the valve rockers, i removed the decompression system and turns out all the tappets are frozen with rust, but i was still unable to turn over...i'm thinkin oil pump, what other areas might it be frozen up on??

Most likely thing is pistons/rings frozen in the cylinder bores. None of the rest of it is likely to be corroded that bad, or strong enough to lock it up.

I did spend a few days soaking the lifters in the last engine I had to free up, along with the pistons, just to be sure. It had sat out in the weather without a head on it for several years.

"ccjersey" wrote:

Most likely thing is pistons/rings frozen in the cylinder bores. None of the rest of it is likely to be corroded that bad, or strong enough to lock it up.

I did spend a few days soaking the lifters in the last engine I had to free up, along with the pistons, just to be sure. It had sat out in the weather without a head on it for several years.

that's the thing though, i was able to move the pistons, all of them before it locked up on me...strange....

It's unlikely that a frozen oil pump would stop the engine from turning. A frozen pump would most likely result in a sheared key in the pump driveshaft gear or shaft. I've never seen a frozen oil pump, even from engines that have been filled with water for 35 years.

The turning restriction is likely to be some other area, such as jamming of the flywheel/clutch in the flywheel housing .. a jammed starter pinion .. or maybe even a transmission problem such as a rusty bearing, or even stuck in two gears.

You need to carefully inspect these areas for any visible problems .. then making sure the clutch is disengaged, try to bar the engine back and forth. You should be able to discern where the problem is, by the location of any clunking sounds, that are not wrist pin/conrod bearing origin. The engine doesn't appear to have enough bore rust in the pictures, to prevent it from turning over.

i'll be pulling the oil pan this thursday i'll be sure to check those problem spots...