Mercury Mariner Models 135 150 175 200 Service Manual, Page 574Get this manual
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LEFT HAND NON-RATCHETING
a -Pinion Gear Shimming Tool (91-74776 or 91-12349A2) -Feeler Gauge -Obtain 0.025 in(0.64 mm) Clearance between Shimming Tool and Pinion Gear -Add or Subtract Shi