Mercury 40 Service Manual page 520

BIGFOOT GEAR HOUSING
6. Inspect impeller. Replace impeller if any of the following conditions exist:
7. Remove plate and gasket.
8. Replace plate if groove(s) (other than impeller sealing bead groove) in plate are more
than 0.030 in. (0.762 mm) deep.
a -
b -
c -
9. Remove bolts and washers.
a -
Page 6B-14
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 impeller hub.
c
Plate
Gasket
Impeller Sealing Groove
Bolts and Washers (6 each)
a
b
19219
a
19217
90-828631R3 MARCH 1999