Yanmar 3YM30, Service Manual

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9. Cooling water system
160
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 oil seal and replace if it is damaged. Also replace the oil seal if there is
considerable water leakage during operation.
(3) Make sure the ball bearings rotate smoothly. Replace if there is excessive play.
Cooling water leakage
less than 3 cm
3
/h
V-pulley
Shaft
Retaining ring
Ball bearing
Spacer
Plate
O-ring
Oil seal
Pump body
O-ring
Cover
(Seawater pump)
Retaining ring
Ball bearing