Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 119Get this manual
10Install bolts (a); torque to 180 Ibsin (20 N.m) 12Check shift operation as follows: aPlace shift lever in forward Gear housing should ratchet when propeller shaft is turned clockwise and resistance should be felt when propeller is turned counterclockwisebPlace shift lever in neutralResistance should not be felt when propeller shaft is rotated in either directioncPlace shift lever in reverse Resistance should be felt when propeller shaft is rotated in either directiondIf shift operation is not as described, preceding, remove gear housing and recheck distance measurement in Step 613Place shift lever in neutral14Install reverse lock actuator loosely on shift shaft15Position reverse lock actuator so that it just contacts reverse lock hook; secure in this position