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1986 170 horse mercruiser lower unit,water pump destroyed .100 inch play between timken bearing and race, driver shaft wobbles. to dissasemble lower unit in which order do you remove shafts, shifter shaft, prop shaft and driver shaft, can't find useful manual for this unit only have parts sheet

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Gear cases are easy to take apart with the proper tools.I suggest buying a Clymer Manuel. it has a list of special tools. TEAR DOWN PROCEDURE(1) remove the propeller shaft bearing carrier assembly by removing the carrier ring. takes a special tool. (2)the bearing carrier depending on the running condition will become stuck in the gear case. there is a special tool for removing the bearing carrier out of the gear case.(3) the bearing carrier houses the reverse gear make sure the reverse gear was removed when the bearing carrier came out. (4)look inside of gear case you will see the propshaft assembly, drive shaft with pinion gear assembly, and the forward gear.(5) on the drive shaft pinion gear you will see a nut. there is a close clearance between that nut and the clutch dog on the propshaft assembly. it takes a special wrench to get this nut off plus a spline tool to hold the drive shaft as your turning the nut off. you can make them both but be careful.(6) there are two different styles for this model of stern drive a "R" and a "MR" the "MR" drive has a retaining nut for bearing preload for the drive shaft. need special tool to remove it. the "R" drive has a spring loaded pin on the top of the driveshaft to control bearing preload. no special tool need to remove shaft after pinion nut removal.(7) once the driveshaft is removed the propshaft comes out by lining up the shift shaft just right. (8) turn the shift shaft until the shift crank is at a right angle to the propeller shaft. you can't see the shift crank because it is behind the forward gear you have to go by experience or feel. once you have the shift crank lined up properly push the propshaft to the left side of the gear case housing then pull out at that angle. GOAL propshaft "clutch dog actuating shaft" in basic terms, is like a hook that grabs onto the shift crank. you unhook it by moving the propshaft tip to the side, causing the back of the propshaft inside the housing, to unhook and move away the the shift crank. it sounds complicated but once you do it you see how easy it is.(9) once you have the propshaft and the forward gear out you can leave the shift shaft inside.there is no need to remove it. have fun

Posted on Nov 04, 2009

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