Engine failure poll?

[deermagnet]

Also are there really no rocker arms?

That's correct. We don't need no stinkin' rocker arms!

I'm curious how the cams actuate the valves.

Our camshafts are driven by internal idler gears instead of a chain. We also have a spring loaded sub-gear assembly that takes up the back lash in the gears to provide high-precision valve timing and reduced noise. Valve action is controlled through an inverted bucket type tappet that rides against the camshaft lobe.

And how you adjust the valves.

Valve adjustment is made by increasing or decreasing the thickness of the shim until the correct amount of valve clearance is obtained.

This is a very rare Isuzu Tech video I have for adjusting the valves, if ya really wanna see how it's done.

7:11, 14.1 mb, 320x240, wmv file-
http://www.drivehq.com/file/df.aspx/publish/mgpa/techvids/valvadj.wmv

I'm an original owner with 238,000 miles on my engine. The valves have never been adjusted. It purrs like a kitten and runs like a dream, so I never saw a reason to have that done.

Mark Griffin (a VX lifer)