1.3.9 Lubrication system
Fig. 8 Lubrication system
(1) Oil pump
(2) Oil pressure regulating valve
(3) Oil cooler
(4) Oil filter
(5) Turbocharger
(6) Main oil gallery
(7) Piston cooling nozzle
(8) Oil pressure sensor
The engine has a pressure lubrication system with the gear oil pump fitted to the lowest level of the
engine. The oil pump is driven by the gear at the front end of the crankshaft.
Nearly all the lubrication points and auxiliary equipment are connected to the pressurised lubrication
system by oil galleries or pipes. The lubrication of the gears in the gear housing, the upper end of the
connecting rods and the pistons is mainly realized by splash lubrication. The undersides of the pistons of
the high output engines are always cooled by the oil spray when the oil pressure is more than 3 bar.
The engine is equipped with closed crankcase ventilation (CCV) system. It is of centrifugal oil separator
type on 84 and 98 engines. There is Super Impactor type CCV system with boost air on 33, 44, 49, 66 and
74 engines. CCV system is maintenance-free.
NOTE: It is very important to use lubrication oil that corresponds to ambient temperatures (see information
for oil quality requirements). Always change the oil and oil filter according to the maintenance chart.
1. Introduction
1-16 4th Generation Engines
8370 79492
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