COOLANT SYSTEM
Coolant Recovery Tank Components and Functions
7-16
6LY3 Service Manual
© 2007 Yanmar Marine International
COOLANT RECOVERY TANK
COMPONENTS AND
FUNCTIONS
The pressure valve opens to discharge steam when
the steam pressure in the coolant tank exceeds 93
to 123 kPa (13 to 18 psi). This consumes coolant.
The coolant recovery tank captures the discharge
of coolant.
The steam discharged into the coolant recovery
tank condenses and the coolant level in the coolant
recovery tank rises.
When the pressure in the coolant system drops
below the normal value, the coolant in the coolant
recovery tank is drawn back into the coolant tank to
raise the coolant level back to its original level.
The coolant recovery tank allows for long hours of
operation without coolant replacement and
eliminates the possibility of burns when the steam
is ejected from the filler neck because the pressure
cap does not need to be removed.
Figure 7-18
Figure 7-18
1 – Filler Cap
2 – Coolant Tank
3 – Subtank
Installing the Coolant Recovery Tank
1. The coolant recovery tank is installed at
approximately the same height as the pressure
cap on the coolant tank (allowable difference in
height: 300 mm (11.8 in.) or less).
2. The overflow pipe should be less than
1000 mm (39.4 in.) long and installed so that it
does not sag or bend.
NOTICE: Make sure the overflow pipe of the
coolant recovery tank is not submerged in the
bilge. If the overflow pipe is submerged in the
bilge, water in the bilge will be siphoned into the
coolant tank when the water is being cooled.
Coolant Recovery Tank Precautions
Check the coolant recovery tank when the engine is
cool. Refill with coolant as needed to bring the
coolant level between the low and full marks.
Check the overflow line and replace if it is bent or
cracked. Clean out the pipe if it is clogged.
0006216
FULL
FU
LL
LOW
LO
W
200
150
1
3
0
(1)
(2)
(
3
)
Coolant Recovery Tank Specifications
Overall Capacity
3.4 L (0.90 gal)
Full Line Capacity
1.5 L (0.396 gal)
Low Line Capacity
0.43 L (0.113 gal)
