190E 2.3 Timing Chain Noise

Not normal... you need new timing chain tensioner.

A 2.3 chain tensioner has a ratchet in it. Unlike the V8 tensioner that are just oil pressure controlled. As a 2.3 chain stretches, the tensioner comes out to take up the slack but it cannot retract. When the tensioner reaches the end of its clicks, it can extend and retract like a V8 tensioner. BUT at this point your chain has stretched to its breaking point. You need to replace the chain very soon! To replace the tensioner, you will need a couple of big allen sockets. You remove the center allen plug. Remove the spring. Remove the housing from the timing cover. Pull the plunger out. To install: screw the housing into the cover tight. Push the plunger in [the ratchet is the spring ring on the butt end]. Install the spring. Put the end plug on the allen socket and PUSH HARD to compress the spring AND turn the allen to start the threads. Have fun!

Another project that I'll never have time for.

Since I think that the chain is fairly new, I'll start with the tensioner. Is there anyway to test the chain for stretch? The P.O. might have used have used a cheap chain.

Thanks for the info.