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I've noticed that some highly efficient oil filters apparently restrict flow at around 3000 miles on filter resulting in valve tap on a 1992 N/T C900. After changing the filter, valve tap goes away. 16 degrees with distributor vacuum line plugged is Bentley spec for C900 turbos. One can remove A/C compressor and its bracket to access chain tensioner to check extension if you think chain is stretched. 12mm spring tensioner center bolt then 27mm tensioner body. C900 11mm max. extension of tensioner as shown in SWEDECAR's photo. New tensioner seal is ALT60212 at NAPA. Also replace O-ring on spring center bolt.
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