Aseembling Engine, Question about O-Rings

[Ketis]

I was about to assemble my freshly honed cylinders last night and when I went to install my new O-rings for the sleeves and I wasn't quite sure which way was correct.


The old ones were pushed down into the gap like the first image, but when I try to do that it bunches up in the front.

The other option is to just let them rest and NOT push them in the gap.


Do I need to keep finagling it into the gap, or is the 2nd picture the way it should be.

 

[hard_y_rd]

I don't know the answer to this but was wondering the same when i put my engine together. The old ones were down in the groove so that's where i put mine. Not quite as bunched up as yours, kinda even them around all the way. I guess the 2nd option would work with the pressure of torquing the top end down but i didn't want to take the chance cause you don't know what it's going to do.
Nobody answered my question when i asked it. Hope someone can help you out with the right answer.

 

[rbjenterprises]

I just let the compression of torquing down the head push them in. No oil leaks so far.

 

[azman857]

I just pushed the o-rings like the second pic and let nature/physics take it from there. Seems to work OK for me.

 

[gggGary]

Here's a large o-ring install trick. Don't start in one spot and work around, push in a bit of the o-ring go to the other side and push in a bit, then go 90 degrees, repeat, repeat on the opposite side of that, push the o-ring in between those spots and you won't end up with too much o-ring all in one place. I learned this putting in my nice fat valve cover o-rings.

 

[Airwolfie]

I did the same as Gary, don't know if it worked as I haven't run mine yet! But my OG's were in the groove as well..........

 

[cowboy3669]

So does anybody know what those o-rings do? put many engines back together without and notice any problems.
Cowboy

 

[TwoManyXS1Bs]

When an engine heats up, the fit of sleeve to cyl block loosens, even enough to slide out, as in sleeve replacement. The o-ring is supposed to prevent engine oil from wicking up between sleeve and cyl-block, maintaining heat transfer and preventing 'fretting', which is the inner wear of the cyl-block which reduces the interference fit 'grip'.

Disclaimer: This was a '60s-'70s Honda tech canned response. Modern methods and manufacturing may have made this moot. I've seen Loctite's sleeve grip compound, but never used it. Back then, when I bored cyl blocks for oversize sleeves, I used a little extra interference fit to ensure sleeve/cyl-block fit at temperature and heat transfer...

 

[Ketis]

Here's a large o-ring install trick. Don't start in one spot and work around, push in a bit of the o-ring go to the other side and push in a bit, then go 90 degrees, repeat, repeat on the opposite side of that, push the o-ring in between those spots and you won't end up with too much o-ring all in one place. I learned this putting in my nice fat valve cover o-rings.

Thanks gggGary! that method worked perfectly!

 

[cowboy3669]

Thank you,understand now.