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Chapter 2 - Page 31
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Lube oil system
The lube oil reduces friction of the components which rub against each other and dissipates heat from the
rubbing positions and the piston. A film of lube oil on the cylinder surfaces supports the sealing effect of the
piston rings. The lube oil also suspends contamination and transports it to the the lube oil filter.
The lube oil pump sucks the lube oil from the oil panand feeds it through the lube oil cooler and the lube oil
filter into the lubrication circuit of the engine.
The lube oil pressure in the engine circuit is set by a lube oil pressure regulating valve. The bypass valve is
installed in the lube oil cooler to avoid the flow of lube oil being interrupted in a cold start. The overpressure
valve opens when the lube oil pressure is sufficiently high and allows the surplus lube oil to flow back into the
oil pan.
Cooling system
The chemical energy in the fuel is converted into heat energy during combustion. The engine can only partly
convert this into mechanical energy. The remaining heat is dissipated mainly with the exhaust gas and the
coolant.
The engine operates with a dual-circuit cooling, i.e. a high temperature circuit and a low temperature circuit.
The combustion chamber walls are cooled by the high temperature circuit. The coolant is fed through the
coolant chambers between the crankcase and the cylinder liners. From there the coolant is fed through
bores in the crankcase to the cylinder heads. Channels in the cylinder heads feed the coolant to the floor of
the cylinder head and the valve seats. The coolant emerges from the cylinder heads and is fed into the cool-
ant manifold to the thermostats integrated in the charge air line.
The charge air cooler is cooled by the low temperature circuit. Depending on the version as air/water or air/
air cooling. In the air/water version a second coolant pump drives another cooling circuit which cools the
charge air in the charge air cooler. In the air/air charge air cooling, the charge air cooling system precedes.
Summary of Contents for TBD 616 OEM
Page 1: ...Operating Instructions TBD 616 OEM Operating Instructions TBD 616 OEM ...
Page 2: ......
Page 138: ...Chapter 8 Page 6 300200137 en 00 fm 0103 Technische Angaben TBD 616 OEM ...
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