Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 440Get this manual
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LEFT HAND NON-RATCHETING
aPinion Gear Shimming 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