Cylinder Head and Valve Train
WARNING: This page is about a different car, the 2015 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 tappet clearance - intake | 0.006-0.010 in (.15-.25 mm) |
| Valve tappet clearance - exhaust - Engine must be at room temperature before measuring | 0.01-0.02 in (.36-.46 mm) |
| Valve guide bore inner diameter | 0.217-0.218 in (5.519-5.549 mm) |
| Valve stem diameter - intake | 0.2157-0.2164 in (5.479-5.497 mm) |
| Valve stem diameter - exhaust | 0.2152-0.2159 in (5.466-5.484 mm) |
| Valve stem-to-guide clearance - intake | 0.0009-0.0028 in (.022-.07 mm) |
| Valve stem-to-guide clearance - exhaust | 0.0014-0.0033 in (.035-.083 mm) |
| Valve head diameter - intake | 1.46 in (37 mm) |
| Valve head diameter - exhaust | 1.22 in (31 mm) |
| Valve face runout | 0.002 in (.05 mm) |
| Valve face angle | 44.5-45.5 ° |
| Valve seat width - intake | 0.051-0.059 in (1.3-1.5 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.) | 1.890 in (48 mm) |
| Valve spring compression pressure (N @ spec. length) | 525 N @ 27.0 mm (114.7 lb @ 1.06 in) |
| Valve spring installed height | 1.457 in (37 mm) |
| Valve spring installed height pressure (N @ spec. length) | 235 N @ 37.0 mm (53 lb @ 1.45 in) |
| Valve spring installed pressure - service limit | 10% force loss @ specified height |