PERIODIC MAINTENANCE
Periodic Maintenance Procedures
12/05
6LY3 Service Manual
4-25
© 2007 Yanmar Marine International
6. After filling coolant, fit the filler cap and tighten it
firmly. To reassemble the cap, align the tabs
(Figure 4-30, (2))
on the bottom of the cap with
the notches
(Figure 4-30, (4))
on the filler port
and turn clockwise 1/3 of a turn.
WARNING!
ALWAYS tighten the coolant filler cap. If the
cap is loose, steam and hot engine coolant
will escape which may burn you.
7. Remove the coolant recovery tank cap
(Figure 4-31, (1))
and fill with coolant mix to the
lower limit
(Figure 4-31, (2))
. Replace the cap
on the coolant recovery tank.
Coolant recovery tank capacity: 1.5 L (3.2 pints)
Figure 4-31
Figure 4-31
1 – Cap
2 – Lower Limit
3 – Upper Limit
4 – Coolant Recovery Tank
8. Check the rubber hose connecting the coolant
recovery tank
(Figure 4-31, (4))
to the coolant
tank. Check that the hose is securely connected
and that it is not damaged.
Be sure to check the following every 500 hours of
operation or 2 years, whichever comes first.
• Replace the Seawater Pump Impeller
• Adjust the Propeller Shaft Alignment
• Check the V-Belt Tension
• Inspect the Thermostat
• Replace the Exhaust / Water Mixing Elbow
• Adjust the No-load Minimum Speed
Replace the Seawater Pump Impeller
NOTICE: The impeller must be replaced
periodically (every 500 hours or 2 years, whichever
comes first).
See Check the Seawater Pump Impeller on
page 4-22
for the procedure.
Adjust the Propeller Shaft Alignment
The flexible engine mounts deteriorate over time
and from extended vibration. This can lead to
increased vibration and misalignment of the
propeller shaft.
1. Check for unusual noise and vibration of the
engine and the hull while gradually increasing
and decreasing engine speed.
2. If necessary, adjust the propeller shaft
alignment.
See Adjust the Propeller Shaft
Alignment on page 4-9
.
Check the V-Belt Tension
See Adjust the V-Belt Tension or Replace V-Belt on
page 4-14
for the procedure.
Inspect the Thermostat
See Inspecting the Thermostat on page 7-18
.
Replace the Exhaust / Water Mixing Elbow
Replace the used mixing elbow with a new one,
even if no damage is found.
0006190
FUL
L
FU
LL
LOW
LO
W
(1)
(4)
(
3
)
(2)
200
150
1
3
0
Every 500 Hours of Operation
