Larry,

Please explain further:

1) Does ratcheting mean that the tensioner adjusts its 'soft' setting as the chain and guides wear?

2) Why does this feature make it pointless to replace the chain as a preventive measure?

3) Does the tensioner maintain cam timing? I can't see how this could work without a tensioner on the other side of the chain as well.

4) How does cam timing adjustment work on an M104?

Thanks,
Sixto
91 300SE