Valves And Tappets
| ITEM | DESCRIPTION |
|---|---|
| 1 | Valve tappet |
| 2 | Valve spring collet |
| 3 | Valve spring seat |
| 4 | Valve spring |
| 5 | Valve stem seal |
| 6 | Valve |
The engine uses 24 stainless steel valves:
- 12 inlet
- 12 exhaust.
The inlet valves are 33.0 mm diameter and the exhaust valves are 28.0 mm diameter. The large valve size allows for large cylinder head port sizes which assist with engine performance and improved emissions. The valve stems are 5.4 mm diameter which allows for reduced flow interruption through the inlet and exhaust ports assisting with performance and improved emissions.
The valves are located in conventional, non-serviceable valve guides in the cylinder head. A valve stem seal with integral valve seat is located in the cylinder head. The valve spring is retained in a compressed state on the valve stem by a valve spring seat and a pair of valve spring collects.
The valves are opened mechanically by a bucket design valve tappet which is operated directly by the associated camshaft lobe. The valve clearance is set by selection of the appropriate valve tappet to achieve the required valve clearance.