Pressure related question
 

Excuse me if I have posted this question in the wrong area.
This is an old subject, #8 bearing leak, and a lot of the people who were involved in this temp. fix years ago, are no longer active on this subject. Right off the bat I want to say this type of fix is only temporary and the only true way of fixing this is just add $$$ and split the case.

Now on to my question. I am using a alum. collar with a rubber nitrile 'O' ring with a sealant. Using pressure on the ring to squeeze the rubber gasket against the block prior to tightening the set screws is important.
How much pressure?

Should I use the same pressure as one would use on torqueing down a case? It would seem to me that using a right amount of pressure should be an important part to stopping any possible leak rather than just hand pressure.

Professional opinions?

Enough pressure to compress the oring, but not enough to squeeze it out.

I will be getting a O ring that is a 60 A diameter hardness so it will withstand a tremendous amount of pressure and it is not squishy.

BC,

Is the contact surface area between the o-ring and the block perfectly flat? I am trying to visualize the aluminum collar with o-ring sitting flat against the crankcase to prevent seepage. Could you post a picture of the aluminum collar with o-ring? Thanks.

Tony

Yes it is perfectly flat. I haven't taken mine apart yet but this is what it would look like.

http://forums.pelicanparts.com/uploa...1599054617.jpg

Interesting... this must be what the nitrile rubber sheet post is about as well!

What if you used a nose bearing O-ring, which will stretch over the nose bearing just fine, and cut a 45 deg chamfer in the aluminum collar so the O-ring is pressed both against the case and against the nose bearing? Use the pulley bolt to apply pressure, and then tighten the set screws.

Even more secure would be a one piece clamping collar with an M-4 or M-5 bolt to clamp it in place on the bearing. You'd need a mill & lathe to make one of those...

All of this assumes the #8 is tightly clamped by the case. The only mechanical stop keeping it from sliding out is the little pin in the RH case half.