Bumper,

Take a look at:

http:/business.baylor.edu/Richard_Easley/autofaqs/iptiming.htm

This is for the turbodiesels but should be similar for your engine.

In short, you turn the injection pump to change the injection timing similar to turning the distributors on older gasoline engines to change the spark timing.

When you adjusted the valves did you check the timing chain elongation?

P E H