Cylinder Head
Cylinder Head Structural Components
| ITEM | DESCRIPTION |
|---|---|
| 1 | Continuously Variable Valve Lift (CVVL) assembly |
| 2 | Engine vent oil separator |
| 3 | Camshaft carrier |
| 4 | Cylinder head |
| 5 | Timing chain cover |
Cylinder Head Components
| ITEM | DESCRIPTION |
|---|---|
| 1 | Bolt (3 off) |
| 2 | Bolt |
| 3 | Bolt - Cylinder head (10 off) |
| 4 | Roller finger cam follower (8 off) |
| 5 | Hydraulic valve tappet - Exhaust (8 off) |
| 6 | Cylinder head |
| 7 | Exhaust valve assembly (8 off) |
| 8 | Intake valve assembly (8 off) |
The cylinder head is cast from aluminum alloy and heat treated. The cylinder head provides location for sixteen valves, four injectors, four spark plugs and one cylinder head temperature sensor. The cylinder head is cooled by a double layer water jacket. Each cylinder has four valves.
Ten bolts secure the cylinder head to the cylinder block. The cylinder head bolts can only be used once and must be replaced if they are removed. Before replacement bolts are used, the holes must be dry and free from oil.
The cylinder head assembly contains the following parts:
- A cylinder head
- A camshaft carrier
- A Continuously Variable Valve Lift (CVVL) assembly
- An engine vent oil separator
- A timing chain cover.
Each cylinder is served by four valves. To help achieve the required gas flow characteristics, these are arranged asymmetrically around the cylinder bore. Each cylinder has a fuel injector and a spark plug.
The valves are a conventional arrangement, with a valve and spring assembly retained by a valve collet. The exhaust hydraulic valve tappet ensures no lash between the camshaft lobe and the roller finger cam follower.
The cylinder head gasket is of a multi-layer steel construction.
| ITEM | DESCRIPTION |
|---|---|
| 1 | Exhaust valve (8 off) |
| 2 | Intake valve (8 off) |
| 3 | Fuel injector (4 off) |
| 4 | Spark plug (4 off) |