Hello all. I have a 617 Mercedes 300sd 1983 turbo diesel. I have recently checked the timing chain.
I checked it with the two timing marks.
I am not happy.

The car currently starts and idles ok.
But, it is extremely lethargic at its acceleration.

The timing mark at the cam matches.
The mark at the outside pulleys is on 15 degrees BEFORE the OT timing.
I am confused by this.
I thought that chain stretch would make it read in degrees AFTER the OT TDC timing mark.

Can someone please tell me why it is reading like this?? Is it because the chain skipped a tooth?
How can I changed the chain back?
I see that you can place a 4,6,8, or 10 degree key in so that it retards or advances the timing.

Is this my best option?
Or should I replace the chain altogether?
The side of the chain tensioner is tight.
The other side is on the loose side.

Again thanks, goldveg
.

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1985 W126 300sd