Yanmar 3GM30F Specifications download pdf (Page 6)

4.3.2 Checking discharged from the seawater outlet pipe

Check that sufficient cooling water is discharged from the seawater outlet pipe. Operation with too

little seawater discharge will burn the impeller of the seawater pump. If seawater discharge is too

small, stop the engine immediately, identify the cause and repair.

Is the Kingston cock open

Is the inlet of the Kingston cock clogged

Is the sea water suction hose broken, or does the hose suck in air due to a loose joint

4.3.3 Inspecting Inner Parts of the Seawater Pump

The inside parts of the seawater pump will deteriorate with use, and discharge performance falls. At

the specified interval or when the volume of seawater discharged is reduced, inspect the seawater

pump in accordance with the following procedures.

1. Loosen the side cover set bolt and remove the side cover.

Illuminate the inside of the seawater pump with a flashlight and inspect. If any of the following

problems is found, disassembly and maintenance are necessary.

Impeller blades are cracked or nicked. Edges or surfaces of the blades are marred or

worm. The impeller must be replaced periodically every 2000 hrs.

Wear plate is damaged.

3. If no damage is found when inspecting the inside of the pump, replace the side cover. Fit the

O-ring to the groove of the joint face before replacing the side cover.

If a large amount of water leaks continuously from the seawater pump during operation,

disassembly and maintenance ( replacement of the mechanical seal ) are necessary.

When disassembly and maintenance of the seawater pump are necessary, consult your Yanmar

dealer or distributor.

Inspection • • every 1000 hours.

Replace • • every 2000 hours.

4.3.4

Inspection and Replace Anti-corrosive zinc (seawater cooling line)

1. Close the Kingston cock.

2. Drain the cooling seawater.

3. Remove the plug labeled ZINC and indicated in the diagram.

4. Check the zinc on the inside of the plug to determine the amount of wear to the anti-corrosive

zinc.

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Yanmar 3GM30F Specifications Page 6