20
N73B60 Engine - Diagnosis
Lubrication System
Oil Circuit (view from engine front)
A. Oil pressure from oil pump
B. Oil supply to VANOS units
C. Oil return
1. Oil supply to intake camshaft
2. Oil non-return valves
3. Oil circuit in oil thermostat
4. Oil return from oil cooler
5. Oil supply to oil cooler
The engine oil is supplied by the oil pump to the lubrication points in the engine block and
is pumped into the cylinder heads. The following components in the crankcase and cylin-
der head are supplied with engine oil:
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• Crankshaft bearings
• Oil jets for piston cooling
• Oil jet for the drive chain (bank 7-12)
• Tensioning rail for drive chain (bank 1-6)
KT-9632
6. Oil supply from oil pump
7. Oil supply , chain tensioner
8. Oil supply , VANOS solenoid valves
9. Oil supply to exhaust camshaft
10. Oil supply to high pressure injection pumps
11. Oil supply to HVA elements
12. Oil supply to Valvetronic eccentric shaft
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• Chain tensioner
• Guide rail on cylinder head
• Hydraulic valve adjustment elements (HVA)
• VANOS supply
• Camshaft bearings
• Overhead oil tubes for the valve gear
