how do u seperate the rods from the pistons

[dohcfiend]

i just finished stripping my shortblock down and seperating the aluminum from the iron. i tried wacking the wristpin a few time but to no avail.

[patgizz]

take em to the machine shop along with your new pistons. they heat the rod end and then slide the wrist pin through the piston and the rod. then the rod end shrinks back down around the wrist pin.

[GPXSS]

hydraulic press.. bench vise will get you nowhere but pissed off quick.

I agree w/ Patgizz.. let the machine shop remove them and install them onto new pistons at the same time.

[dohcfiend]

aight thanx.

[White93z34]

really, when i was helping disasemble a L67 with my friend bill i just poped the clips out of the wrist pin and gave the wrist pin a good whack and out it came, now that piston is a change dish.

[RednBlack]

really, when i was helping disasemble a L67 with my friend bill i just poped the clips out of the wrist pin and gave the wrist pin a good whack and out it came, now that piston is a change dish.

Dude! You said L67! Proper way, has already been said.

[GPXSS]

There are 2 kinds of piston/pin sets.

Press fit:
The small end of the connecting rod where the pin goes through has a smaller diameter hole than the pin. This causes an interference fit and locks it in place.

Free floating fit:
The small end of the rod has a bronze or brass bushing in it, and the hole has a larger diameter than the pin. Spiral locks are used in the pistons at the pin ends to hold in place.

Your buddy Bill had aftermarket pistons and rods, most GM stock engines come with press fit pins/pistons.

[White93z34]

i highly doubt they were aftermarket since thats the first time the engine was ever cracked open after he overreved it and threw a rod. well proper way or not thats how i did it not like he is reuseing the pistons anyhow.