PERIODIC MAINTENANCE
Periodic Maintenance Procedures
4-6 6LY3 Service Manual
© 2007 Yanmar Marine International
PERIODIC MAINTENANCE
PROCEDURES
Inspect Before Starting
Be sure to check the following before every engine
start:
• Visual Inspection of Engine
• Check the Fuel Level
• Check the Engine Oil Level (Crankcase)
• Seawater Outlet
• Check Coolant Level
• Check All Alarm Indicators
• Check for Engine Fluid Leaks
• Check the Electronic Control System
Visual Inspection of Engine
Correct any problems before operation.
Look for:
• Oil leaks
• Fuel leaks
• Coolant leaks
• Damaged or worn parts
• Loose or missing bolts
• Fuel, coolant hoses, cracked V-belts, loose
clamps and fasteners
Check the Fuel Level
Check the fuel and fill if necessary.
Check the Engine Oil Level (Crankcase)
1. Check the engine oil level with the dipstick
(Figure 4-1, (3)). Insert the dipstick fully to
check the level.
Figure 4-1
Figure 4-1
1 – Rocker Arm Cover
2 – Oil Filler Cap (Yellow)
3–Dipstick
4 – Upper Limit
5–Lower Limit
The oil should not be dirty and should have
appropriate viscosity. No coolant or diesel fuel
should be present. The level should be between
the upper (Figure 4-1, (4)) and lower limit lines
(Figure 4-1, (5)) on the dipstick.
Figure 4-2
Figure 4-2
2. If oil level is low, fill to the specified level through
the filler port. NOTICE: Avoid overfilling the
engine oil. Add oil to the upper limit line on the
dipstick. Overfilling may induce oil into the
combustion chamber and damage components.
Engine Oil Capacity at a Rake Angle of 0°
18.8 L (19.9 qt)
0002051
5
1
2
3
4
-4°F 14°F 32°F 50°F 68°F 86°F 104°F
(-20°C) (-10°C) (0°C) (10°C) (20°C) (30°C) (40°C)
SAE 10W-30
SAE 15W-40
0000005
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