Quote:
Originally Posted by kenparker0703
When buying new pistons, the pins come already in the pistons. They are a press fit. When I say "press" that means they are pressed with your thumbs or the heal of your hand. It is a very snug fit- not a just slide in.
The sleeves in the rods should be honed to fit the pins at a machine shop. They are not quite as tight as the pins in the pistons. All the rotation should be betweeen the Pin and the Sleeve in the rod.
You do not want the pin rotating in the piston and wearing on the alumninum piston When everythin inside begins to heat up the pin thru the piston wil tighten up leaving the rod and the brass sleeve to do the rotating.
Well. maybe not rotating, but rocking back and forth. ken
gotta stop now and go to shop and start assembling another engine.....
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The wrist pin does rotate in the piston as well as the rod, that is why they are called " Full Floating". As the piston expands the pin bore gets larger not smaller.
As for wearing on the aluminum most modern engines use a press fit pin that rotates in the piston only.
Bill