Cylinder Head and Valve Train
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Specification |
|---|---|
| Cylinder head gasket surface flatness | Flat within 0.08 mm (0.003 in) length end to end; flat within 0.05 mm (0.002 in) per area 150 mm (5.91 in) x 150 mm (5.91 in) (or full width); flat within 0.025 mm (0.001 in) per area 25 mm (0.98 in x 25 mm (0.98 in) |
| Valve guide bore inner diameter | 0.237-0.238in (6.014-6.044mm) |
| Valve stem diameter - intake | 0.2360-0.2353in (5.994-5.976mm) |
| Valve stem diameter - exhaust | 0.2343-0.2350in (5.951-5.969mm) |
| Valve stem-to-guide clearance - intake | 0.0017-0.0027in (.044-.068mm) |
| Valve stem-to-guide clearance - exhaust | 0.0027-0.0037in (.069-.093mm) |
| Valve head diameter - intake | 1.47in (37.4mm) |
| Valve head diameter - exhaust | 1.24in (31.6mm) |
| Valve face runout | 0.002in (.05mm) |
| Valve face angle | 45.5-46° |
| Valve seat width - intake | 0.051-0.063in (1.3-1.6mm) |
| Valve seat width - exhaust | 0.067-0.079in (1.7-2mm) |
| Valve seat runout | 0.002in (.04mm) |
| Valve seat angle | 44.5-45.5° |
| Valve spring free length (approx.) | 2.450in (62.22mm) |
| Valve spring compression pressure (N @ spec. length) | 699 N @ 33.0 mm (157 lb @ 1.3 in) |
| Valve spring installed height | 43 mm |
| Valve spring installed height pressure (N @ spec. length) | 367 N @ 43.0 mm (83 lb @ 1.7 in) |
| Valve spring installed pressure - service limit | 10% force loss @ specified height |