[Scott Clarke]

Mitch-
The rocker shafts sit in bosses that are different lengths on each side of the rocker arm. The end of the shaft should be flush with the short boss. This should get the shaft close to centered on the arm, allowing the seals to be properly positioned within the bosses. The bolt should be placed so that the head is adjacent to the wider spaces within the cam towers and not the narrower ones. This enables easy removal and replacement of individual shafts. When tightening the bolts, rotate the head and hold the nut stationary. I think that the torque spec is 18 Nm, but you can go to 25 Nm if you have leaks. All of this is nicely described in Wayne's book, which I don't have with me. Please verify torque specs before proceeding!

The seals can be easily damaged during installation. I'd remove the effected shafts, clean them, install new seals, and inspect the bosses for scoring. It is really easy to score the rocker shaft bore during installation. Make sure you have the adjuster backed way out of the rocker arm, and that the cam is positioned so that the lobe is away from the arm before removing or installing the shafts.

-Scott