I think it's time. My car is 42 years old and I think it's time to perform this as a preventive measure.
What do I need to get besides timing chain, guide rails, tensioners?
What is a woodruff key and what does it do.
I saw a write up for a 117, it should be very similar the procedure on my motor, yes?
Tips and know-hows will be greatly appreciated.
Thanks in advance.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT

I did a search and found this

http://www.peachparts.com/shopforum/vintage-mercedes/284475-timing-chain-valve-adjustment-replacement-280c.html

Any other input?

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT

Before getting carried away, measure chain stretch and analyze the condition of the chain. Replacing it based on age is wasteful and expensive. Only replace it if it needs it.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)