need better picture
 

anyone out there that could e-mail me or fax me instructions from a reputable and explicit book on how to replace timing chain and guides on a 91 420 sel?If you do,I would appreciate the help.I've already started,but need some more info so that I know I'm doing it wright.Fax # 931-920-3774.

on your fax, the closest i could come was a 92 420

There are step by step instructions on changing the guides by Roncallo in this thread:

http://www.peachparts.com/shopforum/tech-help/118575-420sel-timing-chain-guide-replacement.html?highlight=420sel

You can find some instructions on changing a timing chain without removing the front cover here:

http://www.peachparts.com/Wikka/M117TimingChain

Remember to deal with the tensioner!

Good Luck.

Geno.