Description And Operation
The cylinder heads are aluminum. They are different in shape from right to left, for the different internal lubrication channels and the different cooling circuit channels.
The cylinder heads are fastened to the engine crankcase via 16 studs (8 per bank).
LEFT BANK:
- 1 - Hydraulic tappets.
- 2 - Intake side valves.
- 3 - Cylinder head-tappet cover interface gasket.
- 4 - Exhaust side valve.
- 5 - Studs for exhaust manifold fastening.
- 6 - Exhaust duct.
- 7 - Intake duct.
- 8 - Injector housings.
On the upper side of the cylinder heads there are 4 alignment bushings (1) for the tappet cover.
Along the bottom (deck) of the cylinder head there are three combustion chambers. Inside them is where the air-fuel mixture burns, releasing thermal energy needed to increase the pressure from which the engine performance is obtained in terms of throttle and power.
The inlet and exhaust valve guides are steel.
Inside the cylinder heads are the lubrication and oil supply channels for the solenoid valve phase transformer.
The intake and exhaust runners are designed to optimize the flow of fresh charge with the correct amount of turbulence to help the complete mixture of fuel and air in the combustion chamber.
Right Bank:
- 1 - Solenoid valve housing for deactivating the cylinder 1 tappet, intake side.
- 2 - Solenoid valve housing for deactivating the cylinder 1 tappet, exhaust side.
- 3 - Solenoid valve housing for deactivating the cylinder 2 and 3 tappet, exhaust side.
- 4 - Solenoid valve housing for deactivating the cylinder 2 and 3 tappet, intake side.
The right bank cylinder heads have the same characteristics as the left ones. The main difference is the different shape of the tappet housing, the internal oil passage channels and the solenoid valve housings to deactivate the tappets.
The presence of tappets that can be disabled implies that there is an additional oil passage channel in the right cylinder head needed for the tappets to operate.
- 1 - Additional channel to disable tappets.
There are 4 filters (non-serviceable) for the additional channels, to ensure a further filtering step for the oil that operates the tappet deactivation mechanism.
The cylinder head gaskets are three-layer metal type. It is available in one thickness only. The thickness value (in compressed conditions) is 0.87mm ±0.05mm.