Engine lubrication and oil circuit
38
Cooling and lubrication
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
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Lubricating system
The engine lubrication system minimizes the mechan-
ical friction and thus the wear
on moving parts. In
addition, the oil pads between the bearings and
running surfaces reduce shocks and vibrations. A
pressure differential valve is installed in parallel to the
oil-water heat exchanger to ensure that the engine is
lubricated at all times. This allows the oil to be routed
around the oil-water heat exchanger.
Oil circuit
All of the moving components of the engine are lubri-
cated and / or cooled with engine oil via the oil circuit
of the engine.
The oil circuit of the engine is supplied with engine oil
via the oil pump. In addition, the vacuum pump is
driven and sup
plied with engine oil via the oil pump.
The following components in the crankcase are
supplied with engine oil via the main oil duct:
• Crankshaft bearings
• Connecting rod bearings
• Intermediate gears
• Oil spray nozzles
The two turbochargers are supplied with engine oil via
a bypass
of the main oil duct.
The oil supply for the cylinder
head branches off from
the main oil duct. The following lubrication points in
the cylinder head are supplied with engine oil:
• Cam chain tensioner
•Intake camshaft
•Exhaust camshaft
• Hydraulic valve clearance compensator
The engine oil is returned to the oil pan via return
ducts.
i Note
The CDI control unit reads in the oil level check
switch to monitor the oil level and the oil temper-
ature sensor to monitor the oil temperature.
Oil pump
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