Update-2017 new project

Found this when tearing motor down, no scoring on the sleeves, so caught it in time, getting new cylinders, sleeves and wrist pins anyway, so all is good.
a247074.jpg
 
(quoted from post at 19:46:41 01/02/17) Found this when tearing motor down, no scoring on the sleeves, so caught it in time, getting new cylinders, sleeves and wrist pins anyway, so all is good.
a247074.jpg

Be sure to have your connecting rods reconditioned with new wrist pin bushings. The bushings are not always part of a rebuild kit. Have your machine shop "fit" the new pins. Also I'd carefully check the thrust of the crankshaft with new bearings.
 
(quoted from post at 17:54:14 01/03/17)
(quoted from post at 19:46:41 01/02/17) Found this when tearing motor down, no scoring on the sleeves, so caught it in time, getting new cylinders, sleeves and wrist pins anyway, so all is good.
a247074.jpg

Be sure to have your connecting rods reconditioned with new wrist pin bushings. The bushings are not always part of a rebuild kit. Have your machine shop "fit" the new pins. Also I'd carefully check the thrust of the crankshaft with new bearings.

What do you mean by "thrust of the Crankshaft"?
 
(quoted from post at 13:06:47 01/03/17)
(quoted from post at 17:54:14 01/03/17)
(quoted from post at 19:46:41 01/02/17) Found this when tearing motor down, no scoring on the sleeves, so caught it in time, getting new cylinders, sleeves and wrist pins anyway, so all is good.
a247074.jpg

Be sure to have your connecting rods reconditioned with new wrist pin bushings. The bushings are not always part of a rebuild kit. Have your machine shop "fit" the new pins. Also I'd carefully check the thrust of the crankshaft with new bearings.

What do you mean by "thrust of the Crankshaft"?

Thrust of the crankshaft is forward / backward endplay of the shaft. There has to be some to allow for movement and expansion. I believe the spec on these old fords is .002 -- .006. This is controlled by the center main bearing fitting into the main bearing saddle, If the crankshaft itself is too far worn, you can have too much endplay. This allows the crankshaft to move too much fore and aft. If it is allowed to move way too much, the connecting rod will but hard up against one side of the piston, possibly causing what you saw. Albeit this would be an extreme situation. One that I have seen though.
 

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