MG MGA Twin Cam Workshop Manual page 145

Fig. H.7 The gauge in position on the pinion with the dial indicating a variation from the standard
b. If the clock reading is plus and numerically less than the pinion marking, reduce
the washer thickness by the difference.
Example:
Clock reading
Pinion marking
Variation from nominal
Reduce the washer thickness by this amount.
c. If the clock reading is plus and numerically greater than the pinion marking,
increase the washer thickness by the difference.
setting
-.005 in.
+.004 in.
-.003 in.
145
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