5A-10 LOWER UNIT 90-13645--2 1095
Water Pump (Design 1)
1. If water tube seal stayed on water tube (inside of
drive shaft housing) when gear housing was
removed, pull water tube seal from water tube.
2. Replace water tube seal, if damaged.
3. Remove 4 bolts, washers, and isolators.
4. Remove cover.
19212
a
b
c
d
e
c
d
b
a - Water Tube Seal
b - Bolts (4 each)
c - Washers (4 each)
d - Isolators (4 each)
e - Cover
IMPORTANT: The circular groove formed by the
impeller sealing bead should be disregarded
when inspecting cover (Step 5) and plate (Step 9),
as the depth of the groove will not affect water
pump output.
5. Replace cover if thickness of steel at the dis-
charge slots is 0.060 or less, or if groove(s) (oth-
er than impeller sealing bead groove) in cover roof
are more than 0.030 (0.762mm) deep.
6. Lift impeller, drive key, and gasket from drive
shaft.
a
b
c
19220
a - Impeller
b - Drive Key
c - Gasket
7. Inspect impeller. Replace impeller if any of the
following conditions exist:
– Impeller blade(s) are cracked, torn, or worn.
– Impeller is glazed or melted (caused by opera-
tion without sufficient water supply).
– Rubber portion of impeller is not bonded to
impeller hub.
8. Remove plate and gasket.
9. Replace plate if groove(s) (other than impeller
sealing bead groove) in plate are more than
0.030 (0.762mm) deep.
19219
a
b
a - Plate
b - Gasket
10. Remove bolts and washers.
a
19217
a - Bolts and Washers (6 each)
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