Mercury Mariner Models 135 150 175 200 Service Manual, Page 521Get this manual
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RIGHT HAND NON-RATCHETING
aPinion Gear Tool (91-74776 or 91-12349A2)Feeler GaugeObtain 0.025 in(0.64 mm) Clearance between Shimming Tool and Pinion GearAdd or Subtract Shim(s) Here