TO ADJUST CAM SHAFTS WHICH TIME VALVE OPENING AND CLOSING
Make sure that push-rod adjustment is right—that a thin card will pass between push rod and valve stem when valve is closed.
Determine direction of rotation of cam shafts.
Set fly wheel so that the mark 1 T. C. (top center) registers with pointer.
Turn fly wheel until mark 10° P. T. C. (past top center) registers with pointer.
Rotate exhaust cam shaft in proper direction until the exhaust valve of No. 1 cylinder has just closed.
Rotate inlet cam shaft until inlet valve of No. 1 cylinder is just about to open.
Mesh the gears and lock them in place.
If No. 1 cylinder is right the others must be.