wrist pin clip direction

[mikefealk]

should the ends of the wrist pin clips be facing away from the hole thingy or does it matter

[yeadon_m]

open ends upwards or downwards, I read, but not horizontally.
Mike

[Coyote]

I don't pay any attention to direction. I'm just happy to get them in. However on this latest build, my son went through and put all the openings downward. Logic tells me that it shouldn't make any difference

[mikefealk]

thanks guys. will be putting the cylinders on motor today.

[smokin_blue]

My Suzuki mechanic just told me last week they should be either up or down but not front or back.

Also, if you removed them you should really replace them with new ones. He left my inside ones in so I will just be replacing the outboard ones.

[tz375]

I think the logic behind that is as the piston rises and falls the stress on the small end is such that people imagine the piston boss opening up and closing every revolution and the pulsing might cause the clip to pop out or to lose tension and drop out.

I have seen the aftermath of piston pins gouging the liner but no real evidence that a clip came out because of its position.

[mikefealk]

cylinders are on. wasnt the easiest thing ever, but they are on.

[Coyote]

Yeah Mike, they are really hard to do alone. I did RedZone by myself and I remember it was a bear. Worried most about the rings moving over the pins and trying to compress them and guide the cylinder on at the same time ---------------- well there's a word for it, but not here.
I was fortunate to have my son help me this time. He compressed the rings as I lowered the cylinder. Much much easier with a helper.

[Pete O'Dell]

Makes no real difference they rotate in use ( or should do)

[mikefealk]

ya i had a helper i dont know how it would even be possible by yourself

[Suzukidave]

It even funner with the GT750 engine if you are working alone and your juggling the heavy block , adjusting rings and turning the crank to raise the next piston . I followed a fellow list member's idea and tipped the engine up at about 45 deg and this made the process much easier

[mike1161]

The correct way is for the open end to be either up or down, as a few others have said. And the reason is that at high piston speeds, think of the force on the clip, it tends to compress it. If you have put it in with the open end facing either side (i.e., 3 o'clock or 9 o'clock), the forces could make the circlip compress a bit and open up. But if the open end is either facing up or down, the forces won't really make the circlip wire open at all. There are some pretty amazing loads and forces when you think how fast the piston moves; there are some websites which talk about this.
So I have always put my circlips in with the open ends up or down, why take any chances on something like that?

[Pete O'Dell]

some of you clearly don't get the concept that the circlips gently rotate with use do you I usually put them in gap at 3 or 9 because its easier never had a engine fail yet because of a wire circlip popping out repaired the results of eared circlip damage before on four strokes though.

[Coyote]

I agree with Pete. I'm betting that if you build your motor with all the clips facing up or down, ride the bike for a year and pull the jugs off, the clips will be all over the place - not even close to where you intentionally put them.

[titan performance]

I've never put them in any particular position....though I didn't realise they move with use. Never ever had one come out......can't imagine they ever would, the amount of force it takes to pop them in there.
I did see the state of a mate's YR5 engine when a clip he thought had pinged across the workshop had actually gone down below. The muppet hadn't covered the crank case openings. Unbelievable amount of damage.