PERIODIC MAINTENANCE
Periodic Maintenance Procedures
12/05
6LY3 Service Manual
4-7
© 2007 Yanmar Marine International
Seawater Outlet
1. Check for seawater discharge immediately after
engine start. Shut down right away if no
discharge water is present. Troubleshoot and
correct seawater discharge problems before
operating engine.
Check for:
• Leaks in the seawater pump and lines
• Seawater pump impeller
(See Disassembling
the Seawater Pump on page 7-6.)
Check the Coolant Level
1. Check fluid level in the coolant recovery tank.
The fluid level of the coolant recovery tank
should be between the upper and lower limit
lines.
2. Check the coolant level in the coolant recovery
tank
(Figure 4-3, (4))
. If the coolant level is
close to the LOW mark
(Figure 4-3, (2))
, open
the coolant recovery tank cap
(Figure 4-3, (1))
and replenish the coolant recovery tank with a
50% mixture of LLC and 50% clean soft water
to the FULL mark.
(Figure 4-3, (3))
.
CAUTION!
ALWAYS wear eye protection and rubber
gloves when you handle LLC. If the coolant
comes in contact with the eyes or skin, flush
eyes and wash immediately with clean
water.
Figure 4-3
Figure 4-3
1 – Coolant Recovery Tank Cap
2 – LOW Mark
3 – FULL Mark
4 – Coolant Recovery Tank
3. Replenish engine with coolant. If the fluid level
in the coolant recovery tank is lower than the
LOW mark, open the filler cap and check the
coolant level in the engine coolant tank.
WARNING!
NEVER remove the coolant filler
cap if the engine is hot. Steam and hot
engine coolant will escape and seriously
burn you. Allow the engine to cool before
attempting to remove the filler cap.
Replenish the engine with coolant if the level is
low.
• Check the coolant level when the engine is
cold.
• Check the coolant recovery tank daily.
Standard
NOTICE: If coolant levels drop quickly or the
coolant tank depletes with the recovery tank
unchanged, check for a fluid or air leak in the
system. Adding coolant to the recovery tank
during operation is not abnormal. The increased
coolant in the coolant recovery tank returns to the
coolant tank when the engine cools. If the engine
coolant level is normal in the coolant recovery
tank but low in the engine coolant tank, check for
loose hose clamps, broken hoses or other leaks.
0006160
FUL
L
FU
LL
LOW
LO
W
(1)
(4)
(
3
)
(2)
200
150
1
3
0
Engine and Engine
Coolant Tank Capacity
Coolant Recovery Tank
Capacity
28 L (30 qt)
1.5 L (1.6 qt)
