Cylinder Head
| ITEM | DESCRIPTION |
|---|---|
| 1 | Inlet camshaft bearing cap (4 off) |
| 2 | Front camshaft bearing cap |
| 3 | Nut, washer and stud (24 off) |
| 4 | Exhaust camshaft bearing cap (4 off) |
| 5 | Rear exhaust camshaft bearing cap |
| 6 | Rear inlet camshaft bearing cap |
| 7 | Cylinder head |
| 8 | Inlet ports |
| 9 | Fuel injector location (4 off) |
| 10 | Spark plug location (4 off) |
| 11 | Valve seat (8 off inlet - 8 off exhaust) |
| 12 | Valve guide (16 off) |
| 13 | Inlet valve location |
| 14 | Exhaust valve location |
The cylinder head is cast from aluminum alloy. The cylinder head provides location for two camshafts, sixteen valves, four injectors and four spark plugs.
Each cylinder has four valves. To help achieve the required gas-flow characteristics, these are arranged asymmetrically around the cylinder bore. Each cylinder has a centrally mounted spark plug.
The four fuel injectors are located on the inlet manifold side of the cylinder head and direct fuel into the combustion chamber from between the inlet valves. The injectors are retained in the cylinder head by the direct injection fuel rail.
Each camshaft is held in the cylinder head by 4 bearing caps, a front bearing cap and a rear bearing cap. The bearing caps are retained with a combination of bolts and studs, washers and nuts.