How to change piston pin bearings

[ur730im911]

hey so how is this done is there any special way to do it do i need that special $65 motion pro tool and is there any sites that tell me how to do it ? any help would be great thanks
Dave

 

[76GMC1500]

You can use sockets and a vice much like you use them to drive out U-joints on a driveshaft. Use a smaller socket to drive the wrist pin out into a larger socket.

 

[Ol'89r]

It's a fairly simple thing to do. Remove the circlip from one side of the piston and using a drift that fits inside of the piston pin but not all the way through, push the pin out.

Back up the piston with your hand so that you don't put side pressure against the rod. Once the piston is off, the small end bearing will just slip out of the rod end.

When re-installing the wrist pin, be sure the pin fits correctly in the piston. The pin should slip into the piston with no resistance. You should be able to slip the pin in and out of the piston with your fingers. If the pin is too tight, hone the piston to a proper fit.

A tight wrist pin can cause your piston to seize.

Just my $ .02

 

[dezryder]

What Ol'89r said.

It's a nice easy slip fit. Pay special attention to the circlips on re-installation, making sure they are well seated.

 

[junkjeeps]

What everyone else said, plus oil everything well on reassembly with premix oil.

 

[wirefryer#85]

What everyone else said, AND.

Make absolutely sure those sneaky circlips are seated fully in their groove. I had one let go on me and it made a very exspensive mess. :|

I now use a pair of wire cutters to carefully dimple or 'swage' the piston in a couple spots on the outside edge of the clip groove to add an additional block to the circlips (after the clips are installed).

 

[dezryder]

What everyone else said, AND.

Make absolutely sure those sneaky circlips are seated fully in their groove. I had one let go on me and it made a very exspensive mess. :|

I now use a pair of wire cutters to carefully dimple or 'swage' the piston in a couple spots on the outside edge of the clip groove to add an additional block to the circlips (after the clips are installed).

I'm sorry, but I whole heartedly would not recommend that procedure. A novice mechanic could totally screw up the piston trying to pin the circlip in place. (I believe they should be free floating)

I don't think it is needed or an answer to a clip failure. Just seat them properly and rest easy. Go riding, and have fun!

 

[76GMC1500]

Use Spirolocks, they don't come out.