Sorry about the stuttering replies.

I know that the M103 and M104 gas engines have the ratcheting tensioners. I have never taken apart a diesel later than the 616 or 617, so I'm not sure about them. I don't think they have a ratcheting tensioner though. The ratcheting tensioner seems to go hand in hand with the single row timing chain of the gas inline engines.

I have never replaced the banana rail except at complete over haul. If memory serves me correctly, you will have to remove the cam sprocket or maybe the camshaft to get it out. Why are you changing it? Does it look bad? They are not bad about breaking like the ones on the V8's.

Good luck,