This is a multiple valve cylinder head with 24 valves and 2 camshafts. In addition, there is also one injector between the inlet and outlet valves per cylinder.
The most important features of the cylinder head of the Y 25 DT engine are described below:
- Aluminium casting.
- Integrally cast timing case.
- The coolant flows from the outlet side to the inlet side.
- Coolant outlet in centre between 3rd and 4th cylinders.
- The common-rail injectors are arranged centrally and vertically for each cylinder.
- 4-valve technology.
- One inlet swirl duct and one inlet tangential duct per cylinder.
- Combined outlet ducts in the cylinder head. Two outlet ducts open into one exhaust manifold inlet per cylinder.
- The cylinder head cover comprises a plastic housing with integrated fluid separator, pre-separator with cyclone, fine separator with downstream thread reel. Attachment to cylinder head via decoupling elements.
- Three-layer cylinder head gasket – multi-layer steel gasket.
- Water through-flow cross-sections adapted to the requirements of a uniform coolant flow specific to each cylinder.
Illustration L0008280 shows inlet and outlet ducts.
| 1 | Piston | 5 | Inlet swirl duct |
|---|---|---|---|
| 2 | Outlet valve (one is not visible) | 6 | Inlet valves |
| 3 | Combined outlet ducts | 7 | Inlet tangential duct |
| 4 | Injector | 8 | Glow plug |
Illustration L0008370 shows the position of the camshafts and the location of the inlet and outlet ducts.
| 1 | Inlet swirl ducts | 6 | Camshaft drive gear, inlet camshaft |
|---|---|---|---|
| 2 | Combined outlet ducts | 7 | Camshaft drive gear, outlet camshaft |
| 3 | Stud bolts for exhaust manifold attachment | 8 | Inlet tangential ducts |
| 4 | Outlet camshaft | 9 | Injector mount |
| 5 | Inlet camshaft |