This should get you started:
http://www.peachparts.com/shopforum/showthread.php?t=96572

http://www.peachparts.com/shopforum/showthread.php?t=97743

http://www.peachparts.com/shopforum/showthread.php?t=116148

http://www.peachparts.com/shopforum/showthread.php?t=107042

I threw this one in for kicks:
http://www.peachparts.com/shopforum/showthread.php?t=116766

You can do a quick check at times. Checking when adjusting valves is a perfect time. Line up the marks on the cam and cam tower. This is not considered a difinitive way of checking but will give you a very close idea of where you stand without having to break out the dial gauge.

Danny

__________________
1984 300SD Turbo Diesel 150,000 miles

OBK member #23

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination