Mercury 15 EFI FourStroke, Service Manual

Page: 335 / 406

5. Slide the spring and clamp over the driveshaft. Compress the spring approximately 6 mm (0.25 in.), and tighten the
fastener on the clamp.
a - Water pump base
b - Water pump guide plate (with gasket)
c - M6 x 1 screw (4)
d - Spring, compress 6 mm (0.25 in.)
e - Clamp
f - Driveshaft
g - Backlash indicator arm (install later)
Spring 8M0011503
Clamp 8M0033741
NOTE: It may be easier to rotate the gearcase nose down, while preloading the forward gear. Rotate the nose back up so
the driveshaft is vertical before taking measurements.
6. Preload the forward gear:
a. Insert the backlash preload tool into the gearcase so that it presses against the forward gear.
b. Attach the preload tool to the gearcase, using two spacers and two screws.
c. Tighten the screws to the specified torque.
d. Thread two nuts onto the end of the backlash preload tool, and tighten (jam) the two nuts against each other.
e. Using the jam nuts, tighten the preload tool to the specified torque.
a - Backlash preload tool
b - Screws (2)
c - Jam nuts (2)
d - Spacers (2)
Description Nm lb‑in. lb‑ft
Preload tool screws 9.0 79.6 –
Preload tool jam nuts 5.1 45.1 –
Backlash Preload Tool 91‑895195T04
7. Slide a backlash indicator arm over the driveshaft until it rests on the clamp. Secure the arm with the two integral fasteners,
to ensure that it does not move.
Backlash Indicator Arm 91‑803133 12
8. Attach a dial indicator and dial indicator adapter to the gearcase, using a piece of threaded rod and two nuts (obtain
locally).
a
b
c
d
e
f
g
64955
64956
a
b
c
d
Gear Housing (2.15:1)
Page 6A-34 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017