I wanted to adjust the valves on my 8.3 cummins,but did not have a turning tool.The PO did mark the harmonic balancer.
I first took off the hyd pump belt,then unloosen the 4 bolts holding the pulley to the balancer then remove pulley.
This will reveal 4 bolts spaced about 5" apart,simply put a 18mm socket on one of the bolts and you can easily turn engine
over.
Only takes a few minutes.
How about the second part? :D How far out were they? Exhaust vs intake? Miles/years since previous adjustment?
Pierce
When you reinstall that pulley, spend some time ensuring it is concentric. Mine was mounted slightly off center and was causing bouncing in the tensioner. Use a piece of chalk or dial indicator to find the high spot. Chalk/wax marker workers fine, just start engine up and move it closer till it hits on the high spot.
I made a thread about the process a while back.
Not sure when last check was(po passed away)but every valve was right on the money,.024 and .012,engine has 207k,
underside of valve cover looked like new.