How Valve springs are checked
I had to check the valve springs for a 4G63T
This is a simple process. But a specialized piece of equipment is needed.
I use a Rimac spring tester with a 300lbs scale.
The first thing to do is set the stop to the correct height.
The spec used is 66lbs @ 1.575
I find that a venier caliper is more accurate than the built in scale.
(http://i261.photobucket.com/albums/ii49/BogusSVO/4G63T%20head/DSCF3967.jpg)
Place the spring to be tested in the spring tester
(http://i261.photobucket.com/albums/ii49/BogusSVO/4G63T%20head/DSCF3966.jpg)
Compress the spring to the pre set height and read the pressure.
(http://i261.photobucket.com/albums/ii49/BogusSVO/4G63T%20head/DSCF3968.jpg)
It is a quick and simple way to have your valve springs checked to make sure they are in good serviceable shape.
Low spring tensions can lead to a lazy rev of your engine and also valve float.