2.5
Lubrication System
4M06 Series engines are equipped with a lubrication system including an oil cooler.
The gear driving oil pump is located at the low front of the engine.
Many engine parts are lubricated by pressurized oil through piping and crankcase hoses.
Oil circuit
Figure2.5A-Overall Layout of oil circuits
Oil filters
4M06 Engine range is equipped with a lubricating system including 3 full flow oil filters
"Full flow" filters fitted in series on the circuit.
These cartridges are equipped with a by-pass valve allowing the continuity of the engine
lubrication even in case of a sudden clogging.
The engine oil from the oil pan passes through the oil suction strainer and then is pumped into
the oil filters and oil cooler by the oil pump, and finally arrives at the positions needed to be
lubricated through the oil line system. Most of the oil will come to the main bearings and then to
the connecting rod bearings via the oil gallery of crankshaft. The lubrication of cylinder liner
surface and piston pin is achieved through the lubricating oil injected by the piston cooling
nozzle. The valve control system, turbocharger, fuel injection pump and intermediate gear
bearing are also provided with forced lubrication via the oil pipe and oil gallery. The piston
head is cooled through injecting lubricating oil to the inner chamber of piston by the piston
cooling nozzle; and the lubricating oil is cooled by the cooling coolant in oil cooler. The pres-
sure of lubricating oil in the circulation system is regulated by the pressure limiting valves in the
oil pump body and main oil gallery.
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