Rubber corner seal plug
 

I've just heard mixed signals from some about rubber corner seal plugs.

I just want basic info on what people know about them. Why would someone not use them in a engine that has the spot in the corner seal for them? What would happen if you did not use them?

They are rubber. They are going to burn up almost immediately when you run the engine. Think about it.

Use the solid metal corner seals.

Re: Rubber corner seal plug
 

When I did my rebuild, I made my own. I went and bought 1 foot of O ring cord for like 15 cents. And cut my own with a razor blade. Dont know why they use them, I just figured if it was in there use 'em

They're not rubber, they're Viton.

When I tore down the '83 engine, they were in good shape. They went back in. When I took the engine apart 23,000 8000rpm+ drvving miles later, all six corner plugs were MISSING. Whoops.

:eek: How did that happen? Do you think they discingrated? Its weird because when I tore down one engine, I didn't see them in there, were as another engine I took apart, they were? They must not be very important?:confused: I figure they are there to keep carbon from getting under the corner seal springs and apex seal's springs. Since a engine will run fine without them there that is.

I think they're there to fill the dead space and provide a cushion in case the apex seal starts bouncing. (Kinda like a shock absorber) Considering how often I revved into the seal-chatter range it's no wonder they all went AWOL. :)

crispeed and other engine builders don't bother putting them in. The plug-type corner seals are better than the "solid" corner seals even when you omit the Viton plug, since the plug-type seals are more flexible. More flexible means that when the seal expands in its bore (from the same combustion pressure that forces the apex seals out of their slots) they will not crack. Solid corner seals WILL crack.

Thats all I use is Viton... BTW: I can get anything in viton you need all I need is the dimensions you want it...

I also have Viton o rings for the oil cooler/pedistal replacement if anyone needs em

Viton... that's what A/C o-rings are made of, right?

My engine kit was strangely missing many of the O-rings I needed so I raided the shop's A/C o-ring supply :)

PeeJay, so you are saying that there is no need for them. What about carbon seals? They don't bounce as far as I can tell. Ofcourse they are softer. But I didn't have any intention of using pre '79 style corner seals anyway. Just curious to the need of having the rubber/viton piece if it discenagrates with high rpm engines?