Your original question was somewhat generic. For the 80,000 mile question I had to look to see what model you have.

The V8 timing chain system is a whole different ball game and I am NOT an MB V8 guru. I can tell you this, though, the most common cause of chain failure in the V8, is not the chain itself, but the plastic guides. When one of them breaks, it can and and often does jam the chain causing breakage.

For this reason, the V8 chain and its associated components should receive kid glove care. I wouldn't even bother rolling in a chain without replacing all the guides and maybe even the tensioner. There's too much at stake with one of these engines and they are known for timing chain problems.

I would suggest doing some searches on this site and learn as much as you can about these components. There used to be a pro tech named Aaron that posted here often. He had several V8 cars and offered lots of advice and comments. There will be other posts in the archives that you will find invaluable.

Now for crimping the chain. You won't be able to "crimp" it with a punch. There is a special, very expensive press that can be purchased for this purpose, but I have never used one. I have had good success by putting the link in from the back, then putting the retainer plate over it paying attention to which side of the plate goes toward the chain. The side that feels sharp on the edges when running you finger over it, goes toward the chain. Then put a large hammer or body dolly behind the master link and peen the front portion with a ball peen hammer.

Merry Christmas,