Hi Everyone
I'm replacing the valves Stem Seals, BUT, I want to do it with out removing the Cylinder Head, I seen a lot of mechanics do it by pressurizing the Cylinder's chamber, can I do that in the 03 Land rover Disc?

 

You can, but I think its easier to feed a bit of rope into the plug hole then turn the crank until the piston squeezes it up to the valves.

 

I have the fittings to connect the Air to the block, and I did that yesterday, but the air start coming out the SAI Control Valve, if I sealed the four holes for the SAI valves, would be that enough to pressurize the Cylinder?

 

I think when you remove the rocker rail from the head the exhaust and intake valves will close completely and you can pressurize the cylinders without worrying about the SAI.

 

this is what I thought also, but the Air was leaving through the SAI holes. and now I'm looking for anything to seal the four holes, and try again.

 

Just make sure the piston is all the way up before you remove the spring. If you don't and you break the seal on the valve while working on it, it can fall into the bore. And that will ruin your whole day.

 

Maybe I'm too traditionalist, but, I have never tried 'pressurising' the cylinder head internally and assuming that works, a big assumption, how do you compress the 16 valve springs which has to be done to remove the springs to access the valve stem seals? It all sounds too fantastical to me and a shortcut too many.

If you feel the need to change valve stem seals surely the engine was burning oil or at least smoking some bluish type oil smoke and if so the backs of the valves will be completely gunked up with oil based hardened coke etc and require cleaning which can only be done by removing the valves. It would then be opportune to regrind all the valves and decoke the cylinder head. I'm not trying to put a dampener on your scheme but trying to point out the potential shortcomings.

 

you're 100% right, this is the right way to do it.

 

its now, just to be in the safe side I'm going to feed that rope to the cylinder.

 

Pressurize each cylinder and use this tool to compress the springs. Not an assumption at all, I've done this and it works great for situations where you don't care to remove the head(s).