Valve Springs...Air Pressure

[NO1B4ME]

Replacing valve springs using the air tool method is there a maximum air pressure you can introduce into the cylinder ? Or more the better ?

 

[87geeinn]

Just enough to keep the valves open. I just used rope in the cylinder and works great. You don't have to worry about losing pressure or whether you are on the exhaust or compression stroke.

 

[Blown&Injected]

too much pressure and it will start turning the engine - it takes almost no pressure to keep the valves closed but because there is a possibility of bumping the valve and breaking the seal/pressure on the valve, it is a good idea to move the piston to TDC

 

[PhilM]

dont use anything, just bring piston to top... simple

 

[salvageV6]

40-60lbs. works fine.

 

[87geeinn]

True, you don't have to use anything. However, the rope will keep the valve snug and makes it easier to get those friggin' retainers and keepers back on.