Gear Housing Removal; Gear Housing Disassembly; Water Pump - Mercury 40 Service Manual

Gear Housing Removal

WARNING
To prevent accidental engine starting, remove
(and isolate) spark plug leads from spark plugs
before removing gear housing.
1. Remove (and isolate) spark plug leads from
spark plugs.
2. Shift into forward gear.
3. Tilt engine to full "Up " position.
4. Remove four bolts and washers, two from each
side.
5. Remove trim tab.
6. Remove locknut and washer in trim tab recess.
7. Remove gear housing.
c
b
a - Bolts and Washers (4)
b - Trim Tab
c - Locknut and Washer
6B-12 - LOWER UNIT

Gear Housing Disassembly

Water Pump

1. If water tube seal stayed on water tube (inside of
driveshaft housing) when gear housing was re-
moved, then pull seal from water tube. Replace
water tube seal if damaged.
2. Remove 6 bolts, washers and isolators (Design
1). Remove cover.
NOTE: Isolators from forward 2 screws are different
from the other isolators. Retain these for proper re-
assembly (Design 1).
IMPORTANT: The circular groove formed by the
impeller sealing bead should be disregarded
when inspecting cover and plate as the depth of
the groove will not affect water pump output.
3. Replace cover if thickness of steel at the dis-
charge slots is .060 in. (1.524mm) or less, or if
groove(s) (other than impeller sealing groove) in
cover roof are more than .030 in. (.762mm) deep.
b
a
d
a - Water Tube Seal
b - Bolts (6)
c - Washers (6)
d - Isolators (6)
50555
e - Cover
a
e
c
b
c
d
90-852572R1 JANUARY 1998
b
c
51206