I have a question for a mech. On the valves of the 617.951 diesel there is the cap nut and the jam nut. When I look at the pictures in the manual it appears that the jam nut holds the valve spring compressed. If this is the case when the valves are adjusted won't that change the tension on the valve spring?
Or am I wrong (sure hope so)?

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Mark
82 300SD 100k
91 Caprice SS
92 Jetta TD