Cylinder Head
Cylinder Head Structural Components
| ITEM | DESCRIPTION |
|---|---|
| 1 | CVVL assembly |
| 2 | Engine vent oil separator |
| 3 | Camshaft carrier |
| 4 | Cylinder head |
| 5 | Timing chain cover |
Cylinder Head Components
| ITEM | DESCRIPTION |
|---|---|
| 1 | Bolt (quantity 3) |
| 2 | Bolt |
| 3 | Bolt - Cylinder head (quantity 10) |
| 4 | Roller finger cam follower - Exhaust (quantity 8) |
| 5 | Hydraulic valve tappet - Exhaust (quantity 8) |
| 6 | Cylinder head |
| 7 | Exhaust valve assembly (quantity 8) |
| 8 | Intake valve assembly (quantity 8) |
The cylinder head is cast from aluminum alloy and heat treated. The cylinder head provides location for 16 valves, 4 injectors, 4 spark plugs and 1 cylinder head temperature sensor. The cylinder head is cooled by a double layer water jacket.
There are 14 bolts to secure the cylinder head to the cylinder block. The cylinder head bolts can only be used when and must be replaced if they are removed. Before replacement bolts are used, make sure that the bolt holes and threads in the cylinder block are dry and free from oil.
The cylinder head assembly contains the following parts:
- A cylinder head
- A camshaft carrier
- A CVVL assembly
- An engine vent oil separator
- A timing chain cover.
Each cylinder has 4 valves, 2 intake and 2 exhaust 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 makes sure, that 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 (quantity 8) |
| 2 | Intake valve (quantity 8) |
| 3 | Fuel injector (quantity 4) |
| 4 | Spark plug (quantity 4) |