Rob,

There is an offset key in there - there is a 0 degree key. There no way to check what they key is without pulling the key out, or having a service record. You don't want to do that if things look good.

If the chain measures within acceptable limits using the 2mm valve lift method, and the chain itself, guide rails etc. look healthy, leave it alone. The FSM itself states that the chain stretch can be adjusted until the greatest value woodruff key can no longer be used.

Refer to the FSM for the 2mm valve lift method, or this sites DIY articles. You get a reading of 11-15 degrees of stretch, and there is a conversion which gives you actual stretch. Its not as straightforward as the cam line up method.


dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car