Yanmar 6CXM-GTE2, Operation Manual

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4 Check the zinc on the inside of the plug to
determine the amount of wear to the anti-corrosive
zinc.
• Replace the anti-corrosive zinc when it has been
reduced to less than 1/2 of its original size.
• If there is only a little bit of wear, clean the surface
by sanding off any corroded areas.
5 Replace plug.
6 Open the Kingston cock and check water leakage.
5.2.4 Inspection Every 500 Hrs.
or 2 years.
(1) Adjustment of Top-clearance of Intake/
Exhaust Valves
This maintenance requires specialized knowledge.
Consult your Yanmar dealer or distributor. Adjustment
is necessary to maintain the correct timing for the
opening and closing of valves. Neglecting adjustment
will cause the engine to run noisily and result in
reduced power output and other damage.
(2) Inspecting and Adjusting Fuel Injection
Valves
This maintenance requires specialized knowledge.
Consult your Yanmar dealer or distributor. Fuel
injection must be adjusted to ensure optimal engine
performance.
5.2.5 Inspection Every 1000 Hrs.
or 4 years.
(1) Inspecting Inner Parts of the Seawater
The inside parts of the seawater pump will deteriorate
with use, and discharge performance drops. At the
specified interval or when the volume of seawater
discharged is reduced, inspect the seawater pump in
accordance with the following procedures.

See 4.8.1 (2)
1 Loosen the side cover set bolts (4) and remove the
side cover.
2 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 worn. 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.
Maintenace & Inspection
5
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MARINE DIESEL ENGINE 6CXM-GTE2
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Impeller rotating
direction
Impeller