System Operation
Engine Oil Flow Illustration
| Item | Description |
|---|---|
| 1 | Oil pump screen and pickup tube |
| 2 | Oil pump |
| 3 | Turbocharger oil return tube |
| 4 | Turbocharger oil return tube gasket |
| 5 | Timing chain tensioner |
| 6 | Turbocharger oil filter |
| 7 | Cylinder block |
| 8 | Turbocharger oil supply tube |
| 9 | Turbocharger |
| 10 | Intake VCT phaser and sprocket |
| 11 | Exhaust VCT phaser and sprocket |
| 12 | Exhaust camshaft |
| 13 | Camshaft front bearing cap (part of 6049) |
| 14 | VCT oil control solenoid |
| 15 | VCT oil control solenoid |
| 16 | Camshaft rear bearing cap (part of 6049) |
| 17 | Fuel pump housing |
| 18 | Intake camshaft |
| 19 | Vacuum pump |
| 20 | Cylinder head |
| 21 | Head gasket |
| 22 | Crankcase vent oil separator |
| 23 | Oil filter adapter gasket |
| 24 | Oil cooler |
| 25 | EOP switch |
| 26 | Oil Filter Adapter |
| 27 | Oil filter |
| 28 | Crankshaft assembly |
| 29 | Balance shaft assembly |
| 30 | Oil pan |
Lubrication System
The engine lubrication system is of the force-feed type in which oil is supplied under full pressure to the crankshaft, connecting rod bearings, timing chain tensioners, camshaft bearing caps and (id=373)VCT solenoids. The flow of oil to the valve tappets and valve train is controlled by a restricting orifice located in the cylinder head gasket.
The lubrication system is designed to provide optimum oil flow to critical components of the engine through its entire operating range.
The heart of the system is a positive displacement internal gear oil pump.
Generically, this design is known as a gerotor pump, which operates as follows:
- The oil pump is chain driven off of the crankshaft.
- System pressure is limited by an integral, internally-vented relief valve which directs the bypassed oil back to the inlet side of the oil pump.
- Oil pump displacement has been selected to provide adequate volume to make sure of correct oil pressure both at hot idle and maximum speed.
- The relief valve calibration protects the system from excessive pressure during high-viscosity conditions.
- The relief valve is designed to provide adequate connecting rod bearing lubrication under high temperature and high-speed conditions.
Valve Train
The valve train uses Direct Acting Mechanical Buckets (DAMB). The camshaft lobes are positioned directly above mechanical buckets which are positioned on top of the valves.
Ti-VCT
The Ti-VCT system allows variable control of the valves that optimizes combustion at full load providing improved power and low speed torque (broadening the torque curve) which enables variable valve overlap which provides better fuel economy and emissions and provides optimized cold start operation with improved exhaust emissions.