Lubrication System Flow Diagram
| ITEM | DESCRIPTION |
|---|---|
| 1 | Turbocharger |
| 2 | Exhaust hydraulic valve tappet (8 off) |
| 3 | Exhaust camshaft |
| 4 | Variable camshaft timing (VCT) actuator (2 off) |
| 5 | Intake camshaft |
| 6 | Continuously variable valve lift assembly |
| 7 | Secondary timing chain oil jet |
| 8 | Secondary timing chain tensioner |
| 9 | Primary timing chain oil jet |
| 10 | Primary timing chain tensioner |
| 11 | Piston cooling oil jet (4 off) |
| 12 | Piston cooling oil jet solenoid |
| 13 | Crankshaft |
| 14 | Oil filter and housing assembly |
| 15 | Engine oil cooler |
| 16 | Oil gallery pressure feedback to variable flow oil pump with integral vacuum pump |
| 17 | Variable flow oil pump with integral vacuum pump |
| 18 | Oil return pipe from the turbocharger to the oil pan |
| 19 | Oil pan |
Oil is drawn from the oil pan and pressurized by the variable flow oil pump with integral vacuum pump. The output from the variable flow oil pump with integral vacuum pump is then filtered through the oil filter and housing assembly and distributed through internal oil passageways in the cylinder block and cylinder head.
The output from the oil filter is distributed through oil galleries in the cylinder heads and the cylinder block. All moving parts are lubricated by pressure or splash oil.
Pressurized oil is also provided for
- The Variable Camshaft Timing (VCT) system
- The piston cooling jets
- The timing chain jets
- The turbocharger
- The hydraulic valve tappets
- The continuously variable valve lift assembly
- The timing chain tensioner.
The gallery pressure is fed back to the variable flow oil pump via a drilling in the cylinder block and the variable flow oil pump uses this pressure signal to regulate the oil flow and pressure. The Powertrain Control module (PCM) can control the variable flow oil pump electrically, requesting a pressure held in engine oil pressure map which is dependent on engine speed and load.
The oil returns to the oil pan under gravity. Large drain holes through the cylinder head and the cylinder block ensure the rapid return of the oil to the oil pan. System replenishment is through the oil filler cap on the camshaft cover. An oil drain plug is installed in the side of the oil pan.