Cylinder Head and Valve Train
WARNING: This page is about a different car, the 2020 Ford F-150. 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 -0.238 in (6.014 -6.044 mm) |
| Valve stem diameter - intake | 0.2360 -0.2353 in (5.994 -5.976 mm) |
| Valve stem diameter - exhaust | 0.2343 -0.2350 in (5.951 -5.969 mm) |
| Valve stem-to-guide clearance - intake | 0.0017 -0.0027 in (.044 -.068 mm) |
| Valve stem-to-guide clearance - exhaust | 0.0027 -0.0037 in (.069 -.093 mm) |
| Valve head diameter - intake | 1.47 in (37.4 mm) |
| Valve head diameter - exhaust | 1.24 in (31.6 mm) |
| Valve face runout | 0.002 in (.05 mm) |
| Valve face angle | 45.5 -46° |
| Valve seat width - intake | 0.051 -0.063 in (1.3 -1.6 mm) |
| Valve seat width - exhaust | 0.067 -0.079 in (1.7 -2 mm) |
| Valve seat runout | 0.002 in (.04 mm) |
| Valve seat angle | 44.5 -45.5° |
| Valve spring free length (approx.) | 2.450 in (62.22 mm) |
| 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 |