47
AB Volvo Penta / Diesel Engine TAMD71B
10.5 Maintenance – Cooling System
Fig. 10.7 Engine oil cooler
1. Inlet, coolant
2. Outlet, coolant
3. Inlet, oil
4. Outlet, oil to the oil sump
5. Oil for piston cooling
6. By-pass valve
7. Excess oil returned
10.4 Oil cooler
The lubricating oil transports heat from the high
temperature parts in the engine and equalizes
the temperature differences within the engine.
Heat is removed from the lubricating oil in the oil
cooler. This keeps the oil temperature lower at
high load and speeds. This reduces engine wear
as the oil’s lubricating properties are impaired if
the oil temperature gets too high. Lubricating oils
of lower quality are most sensitive to high tem-
peratures.
The engine’s oil cooler is on the left side, below
the injection pump. The engine oil circulates in-
side the cooler assembly while the coolant pass-
es between the cell plates. The cooler is con-
nected to the freshwater system.
10.5.1 Antifreeze and anti-
corrosion, cleaning
Close the water inlet before working on
cooling system.
The coolant should be changed at least once a
year to prevent cooling from becoming impaired
due to deposits in the cooling system, and to
avoid the risk of corrosion damage to the fresh-
water system since the anti-corrosive additives
in the coolant are consumed over time.
The system should be flushed carefully with tap-
water when changing the coolant. Flush until the
water which runs out of the draining holes is
clean.
NOTE! Certain parts of the coolant system in
the engine are of aluminum. Chemical agents
must not be used for cleaning the system.
For information on draining the coolant, refer to:
“Draining coolant” in chap. 5.8. For antifreeze
protection, see “Coolant” in chap. 4.3.
To Next Page
Loading...
Need help?
General
