I got these exhaust valve stem seals. the Viton ones

I thought they went on just like the intake seals, but they dont seem to actually go on like that, are they supposed to go down and cover the guide like the intake ones and stay there, or are they supposed to run up and down with the valve.

they are tight with the valve, I dont see how they WONT ride up and down, if I put them on the valve and move it, they move with it.

are the like an umbrella or upside down like the intake ones

I think this may be the last valve stem seal question

 

mine were tight on the stem too and ride up and down, i'm pretty sure that's how it's supposed to be.

 

ok, and was the cup part aimed up or aimed down towards the valve guide

shouldnt these have come with intructions?

 

It goes facing down, so that when the valve is fully opened, it would cover the guide completely.

Yeah, seems like instructions would be a good idea, actually, for all the different types of seals; I can't tell you how many heads I've pulled apart that had the O-rings on wrong too (under the retainer instead of inside it under the keepers).

 

Thanks for the help guys.


this question has been running through my head for Days.


WTF can the O- Ring do. it doesnt look like it does anything at all.

 

Aren't the O-rings supposed to go in the second groove and basically come pretty much in contact with the narrowest part of the valve locks/keepers?

 

Right, they go in the lower groove... you put the retainer on, slide it down too far; then put the O-ring in its groove; then put the keepers in which mash down on yop of the O-ring; then let the retainer slide back up when you release the spring comp, and the keepers, retainer and valve stem all mash against it... all it does is to keep oil that collects on top of the retainer from being able to run down the valve stem. Not very effective except with tight guides, totally useless once there's some guide wear.

 

If its not in the exact spot for it to cover at full lift, like if its down a lil bit further, wont it just put it into its spot on its own if the engine is spun over.

Also, how necessary is it to have the O Ring and the Vitons on the exhaust, The intake was easy to put on both, but the exhaust wont let me put the O Ring in for some reason.

 

IF you are using stock diameter valve springs with the oil shedder (thats the metal piece that fits between the retainer and the valve spring)...you should use the o-rings. The stock type o-ring comes in polyacrylic and viton material...the Viton being better.

IF ur using other than stock diameter springs, then you cant of course use the shedders and the o-rings are basically useless.

In that case you should use the viton positive seals on the intake and the "plastic" floating seals on the exhaust.

On well used heads with problematic guides and stock diameter springs you can use the o-rings and the stem seals.

Hope this clears some confuzion.