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, area 150 mm (5.9 in) x 150 mm (5.9 in) (or full width) should be less than 0.05 mm (0.002 in) |
| Valve guide bore inner diameter | 0.2155 -0.2167 in (5.473 -5.503 mm) |
| Valve stem diameter - intake | 0.2138 -0.2145 in (5.43 -5.448 mm) |
| Valve stem diameter - exhaust | 0.2133 -0.2140 in (5.417 -5.435 mm) |
| Valve stem-to-guide clearance - intake | 0.0010 -0.0029 in (.025 -.073 mm) |
| Valve stem-to-guide clearance - exhaust | 0.0015 -0.0034 in (.038 -.086 mm) |
| Valve head diameter - intake | 1.2748 -1.2843 in (32.38 -32.62 mm) |
| Valve head diameter - exhaust | 1.1094 -1.1189 in (28.18 -28.42 mm) |
| Valve face runout | 0.0000 -0.0020 in (-.05 mm) |
| Valve face angle | 45.5 -- 46.0 degrees |
| Valve seat runout | 0.0000 -0.0008 in (-.02 mm) |
| Valve seat angle | 44.5 -- 45.5 degrees |
| Valve spring free length (approx.) | 2.0394 in (51.8 mm) |
| Valve spring compression pressure (N @ spec. length) | 553 -- 607 N @ 27.0 mm |
| Valve spring installed height -- Exhaust | 1.4173 in (36 mm) |
| Valve spring installed height -- Intake | 1.4567 in (37 mm) |
| Valve spring installed height pressure (N @ spec. length) | 286 -- 318 N @ 37 mm |
| Valve spring installed pressure -- service limit | 5 % force loss @ 37 mm |