Cooljjay convinced me to check the stretch before replacing the chain outright, which was a good idea. Now that I've done it, I'm confused about the options, specifically the offset keys available. The FSM says one thing, details from the sellers of the keys say another.

Which one do I get?

I measured the timing chain stretch as per the procedure in the FSM. Dial Indicator, set to negative .08” and then advanced the crank slowly till it was as 0, took my reading on the crank and to my eye it’s right between 10 and 15. Pics attached show it, one with the marks clean and one dirty. I repeated this 3 times, and got the same result.

Now for the confusion. The FSM says a new chain would be at 9 degrees. And 11 degrees after about 20,000 KM.

In the FSM there are these woodruff keys mentioned:

• Part # 621 991 04 67, Offset 0.7 mm, For correction of about 4 degrees.
• Part # 621 991 02 67, Offset 0.9 mm, For correction of about 6.5 degrees. (this same part number on Pelican says 3 degrees).
• Part # 621 991 01 67, Offset 1.1 mm, For correction of about 8 degrees.
• Part # 621 991 00 67, Offset 1.3 mm, For correction of about 10 degrees.

However, when one goes to look at Pelican or ********AZ or anywhere else these keys with the same part numbers have a completely different value given for degrees of correction. On all these sites they only show 3 keys now, and the correct for 2, 3 and 5 degrees. The same part number 621 991 02 67 shows a correction of 3 degrees on everything I can find. Am I right to be confused?

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