Engine/Transmission (1994 - 1998) Piston pin bushing

[DSchell]

Hi Guys,

I'm rebuilding a '95 and I've also got some new piston pin bushings for it. My problem now is that the inside diameter of these bushings is way smaller then the pins outside diameter.

The pin is 40 mm (1. 575") and the bushing is 39. 6 mm (1. 56). I already put a few bushings in the rod, and it really looks like there's no way the pin is going to fit through there. Shouldn't it be sort of a 'loose' fit, so the pin can move/rotate in the bushing?? What's the normal way of mounting these bushings??

Thanks in advance!



Cheers,

Daan

 

[Lightman]

From my experience you will need a wheel cylinder size hone and hone until they fit. It should be a slip fit but not a sloppy one.

 

[NPutman]

i also am rebuilding a 96' enigne, how did you press out and put your new bushings in, looks like you have to have a special tool for the tapered end?

thanks nathan

 

[w-cummins]

Hi Guys,
I'm rebuilding a '95 and I've also got some new piston pin bushings for it. My problem now is that the inside diameter of these bushings is way smaller then the pins outside diameter.
The pin is 40 mm (1. 575") and the bushing is 39. 6 mm (1. 56). I already put a few bushings in the rod, and it really looks like there's no way the pin is going to fit through there. Shouldn't it be sort of a 'loose' fit, so the pin can move/rotate in the bushing?? What's the normal way of mounting these bushings??
Thanks in advance!

Cheers,
Daan

Well the correct way is to use the cummins tool to install them ( and yes the rod ends are tapered and so is the bushing. If you don't have the tool or some thing very close to it you will destroy the bushing when you press it in off axis).
Then you hone the small end bore to spec on a ROD hone _not_ a wheel cylinder hone. Your question leads me to think that you might want to pay some one to do the job for you.


William... .

 

[DSchell]

I slammed the old ones out with a socket. For the new ones I heated the rods in the oven, and then I tapped the bushings in with a nylon tool.



But I think you're right; if they need to be honed then it was better to let the machine shop do the entire job. To much hassle and to high of a risk to ruin the rod or the bushing. And I have to take them to the shop again now anyway for the hone job.



I allready wondered why the guy at the machine shop that delivered the bushings asked me "are you sure you're going to mount them yourself?"



Thanks for your help!



Daan