Mercury 40 Service Manual page 454

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 operation
without sufficient water supply).
Rubber portion of impeller is not bonded to impel-
ler 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 in. (0.76mm) deep.
c
a - Plate
b - Gasket
c - Impeller Sealing Groove
10. Remove bolts and washers.
a - Bolts and Washers (6 each)
6C-10 - LOWER UNIT
11. Remove water pump base.
a - Water Pump Base
12. Remove (and discard) seals.
a
b
19219
a - Seals
13. Remove gasket.
a
19217
a - Gasket
a
19226
a
19195
a
19218
90-852572R1 JANUARY 1998