How do you remove Wrist Pins?

[purplehaze]

(Edited - I had the wrong description. It said wrist pins, and I meant wrist pin BUSHINGS)

Hi,

I'm writing for a friend an an 80 euro SC doing a top end rebuild.

He doesn't want to split the case and would like to press out the wrist pin bushings while the connecting rods are still attached to the crank. The pistons are removed.

He's tried a simple press (think C-Clamp or threaded rod with sockets as a press) but they're not moving.

Any ideas? Can you do this without taking them out to a real press?

Thanks,

Glenn

[914efi]

I just did this, no major probelem. I made a gizmo using a long threaded rod, some washers and a deep scocket to allow me to gently pull the pins (after removing clips) by turning the screw down and also using a bit of leverage on the rod. I smartened up a bit after reading one of the books and heated the pistons with a heat gun to expand them, and the pins almost slide out on their own. I did mine with the pistons still partially in the cyls since I did not want to loosen the rings (I am doing head studs).

[shbop]

Use heat. They'll come right out

[Lukesportsman]

The piston, not the pin

[purplehaze]

Thanks guys, but I was inaccruate in my question -

I meant the wrist pin BUSHING. The ring left inside the rod after you remove the pin and piston. Sorry!

How do you get THAT out of the rod please, while the rods are still bolted to the crank.

THANKS!

Glenn

[Jeff Jagusch]

If you remove the bushing the rods will need to be reworked.
You need to resize the new bushing after it's pressed in place.
I don't think that anyone would do that while still on the crank?

Jeff

[purplehaze]

Jeff (or others) -

So you need to bore out the new bushings to accept the wrist pin?

If that's the case, then yes, it would have to come apart.

Is that what you mean?

Glenn

[patkeefe]

I second the short answer...you don't.
The need to be pressed out, pressed in, and the new one's resized.
Pat

[purplehaze]

Thanks guys!

I'll pass this along.

- Glenn