Re: [MBZ] 300td timing chain issues

[Peter Frederick]

The chain tensioner is oil pressure driven.  With the engine off, 
tension will only be supplied by the fairly weak spring inside the 
tensioner and residual, non pressurized oil.

If you can push the long, curved rail on the passenger side back 
easily, the tensioner is worn and needs to be replaced.  Easy on a 603, 
a pain on the 617.

Peter