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Home >> Lincoln >> 2019 >> Nautilus Base, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine - 2.7L ECOBOOST (238KW/324PS) (1 Of 2)) >> Specifications >> Cylinder Head and Valve Train

Cylinder Head and Valve Train

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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 0.2130 -0.2144 in (5.41 -5.445 mm)
Valve stem diameter - exhaust 0.2122 -0.2138 in (5.39 -5.43 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.) 2.1043 in (53.45 mm)
Valve spring compression pressure (N @ spec. length) 663 N @ 27.0 mm
Valve spring installed height -- Intake 1.4567 in (37 mm)
Valve spring installed height -- Exhaust 1.4173 in (36 mm)
Valve spring installed height pressure (N @ spec. length) -- Intake 368 N @ 37 mm
Valve spring installed height pressure (N @ spec. length) -- Exhaust 397 N @ 36 mm
Valve spring installed pressure -- service limit 5 % force loss @ 37 mm