System Operation
Engine Oil Flow Illustration
| Item | Part Number | Description |
|---|---|---|
| 1 | 6600 6600 | Oil pump |
| 2 | 6622 6622 | Oil pump screen and pickup tube |
| 3 | 6K868 6K868 | Piston oil cool valve |
| 4 | 6303 6303 | Crankshaft |
| 5 | 6C634 6C634 | Engine main bearing cap support |
| 6 | 6675 6675 | Oil pan |
| 7 | 6714 6714 | Oil filter |
| 8 | 6881 6881 | Oil filter adapter (without oil cooler) |
| 9 | 9278 9278 | Engine Oil Pressure (EOP) sensor |
| 10 | 6881 6881 | Oil filter adapter (with oil cooler) |
| 11 | 6A642 6A642 | Oil cooler |
| 12 | 6049 6049 | LH cylinder head |
| 13 | 6250 6250 | Exhaust camshaft |
| 14 | 6250 6250 | Intake camshaft |
| 15 | 6A258 6A258 | LH camshaft cap |
| 16 | 6K602 6K602 | LH valve train oil feed tube |
| 17 | 6K254 6K254 | LH secondary timing chain tensioner |
| 18 | 6B280 6B280 | LH camshaft mega cap |
| 19 | 6M280 6M280 | LH intake and exhaust camshaft VCT oil control solenoid |
| 20 | 6C525 6C525 | LH exhaust camshaft VCT |
| 21 | 6C524 6C524 | LH intake camshaft VCT |
| 22 | 6A280 6A280 | RH camshaft cap |
| 23 | 6K602 6K602 | RH valve train oil feed tube |
| 24 | 6C270 6C270 | RH secondary timing chain tensioner |
| 25 | 6B280 6B280 | RH camshaft mega cap |
| 26 | 6M280 6M280 | RH intake and exhaust camshaft VCT oil control solenoid |
| 27 | 6C525 6C525 | RH exhaust camshaft VCT |
| 28 | 6C524 6C524 | RH intake camshaft VCT |
| 29 | 6049 6049 | RH cylinder head |
| 30 | 6010 6010 | Cylinder head |
| 31 | 6K254 6K254 | Primary timing chain tensioner |
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, piston oil cooling jets and VCT solenoids. The flow of oil to the valve tappets and valve train is controlled by a restricting orifice located in the cylinder head, front camshaft cap.
Oil Pump
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 mounted on the front face of the cylinder block.
- The inner rotor is piloted on the crankshaft post and is driven through flats on 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.
Twin Independent VCT System
The twin independent 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.