if you have a diesel shop near you, you might wanna order some injector heat shields, and pull your injectors out, and have the shop test and balance them. then when you go to adjust your valves, you won't need special wrenches, because the injectors will not be in the way. if you are going to pull your injectors, use a long handle breaker bar, and POP against it, to loosen the injectors from the head DO NOT USE STEADY PRESSURE OR YOU WILL NEED TO BUY AN EXPENSIVE TOOL TO PUT THE PRECHAMBER RINGS BACK IN THE HEAD... ask me how I know...
the most important thing I can think of on changing the vc gasket is CLEAN the valve cover. and make sure it's dry before you put the new gasket on. some use fishing line to tie the gasket to the vc at each hole. keeps it from falling off as you finagle the thing back on the head. use a slip knot to pull the fishing line back out once the cover is placed tightly. don't use any sealant. it's not needed.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!