Every 1250 Hours Of Operation - Yanmar 6LPA-STP2 Service Manual

PERIODIC MAINTENANCE
1. Close the seacock. Drain the seawater cooling
system. See Draining Seawater Cooling
System on page 3-26.
2. Loosen the cover bolts and remove the cover
and O-ring.
3. Inspect the inside of the seawater pump with a
flashlight. If any of the following are found,
disassembly and maintenance are required:
• Impeller blades are cracked or nicked. Edges
or surfaces of the blades are marred or
scratched.
• Wear plate is damaged.
4. If no damage is found when inspecting the
inside of the pump, install the O-ring and cover.
5. If a large amount of water leaks continuously
from the water drain line below the seawater
pump during operation, replace the mechanical
seal.
NOTICE: Replace the seawater pump impeller
every 1000 hours even if no damage is apparent.
Adjusting Intake / Exhaust Valve Clearance
See Valve Clearance Inspection and Adjustment on
page 5-90.
Lapping the Intake and Exhaust Valve
See Valve Seat Inspection and Servicing on
page 5-24.
4-18

Every 1250 Hours of Operation

Every 1250 Hours of Operation Perform the
following maintenance procedures every 1250
hours of operation or 5 years, whichever comes
first.
• Cleaning the Cooling Water System
• Cleaning and Checking the Seawater Cooling
Passage
• Cleaning and Checking the Freshwater
Cooling Water Passage
• Adjusting the Tension of the Alternator V-Belt
• Replacing the Timing Belt
• Washing Engine Oil Cooler
Cleaning the Cooling Water System
See Cooling System on page 7-1.
Cleaning and Checking the Seawater
Cooling Passage
See Seawater Pump Disassembly on page 7-8.
Cleaning and Checking the Freshwater
Cooling Water Passage
See Freshwater Pump Removal on page 7-5.
Adjusting the Tension of the Alternator
V-Belt
See Checking and Adjusting the Alternator V-Belt
Tension on page 4-16.
Replacing the Timing Belt
See Timing Belt Removal on page 5-69.
Washing Engine Oil Cooler
See Oil Cooler Removal on page 8-14.
Replacing the Front Rubber Damper
Replace the Front Rubber Damper.
© 2007 Yanmar Marine International
Periodic Maintenance Procedures
6LPA Service Manual