9. Cooling Water System
149
9.2.2 Seawater pump disassembly
Refer to 2.2.4.(5).
(1) Remove the rubber hose from the seawater pump outlet and then the seawater pump
assembly from the gear case.
(2) Remove the seawater pump cover and take out the O-ring, impeller and wear plate,
(3) Remove the mechanical seal side stop ring.
(4) Insert pliers from the drive gear long hole and remove the stop ring that holds the
bearings.
(5) Lightly tap the pump shaft from the impeller side and remove the pump shaft, bearings,
and drive gear as a set.
(6) Remove the oil seal and mechanical seal if necessary.
9.2.3 Seawater pump Inspection
(Refer to 2.2.4(5).)
(1) Inspect the rubber impeller, checking for
splitting around the outside, damage or
cracks, and replace if necessary.
(2) Inspect the mechanical seal and replace if the spring is damaged, or the seal is
corroded. Also replace the mechanical seal if there is considerable water leakage
during operation.
(3) Make sure the ball bearings rotate smoothly. Replace if there is excessive play.
9.2.4 Seawater pump reassembly
(1) When replacing the mechanical seal, coat the No.1101 oil seal and pressure fit Coat the
sliding surface with a good quality silicon oil, taking sufficient care not to cause any
scratches.
(2) When replacing the oil seal, coat with grease and insert.
(3) Mount the pump shaft, ball bearing and gear assembly to the pump unit and fit the
bearing stop ring. Be sure not to forget the water O-ring when doing this.
NOTE: Coat the shaft with grease.
(4) After inserting the mechanical seal stop ring, mount the wear plate and impeller.
(5) Mount the O-ring and the cover.
NOTE: Replace the O-ring with new one.
Cooling water leakage
less than 3 cm
3
/h
(Sea water pump)
Cover
Pump body
O-ring
Impeller
Wear plate
