303-01A Engine - 3.7L Duratec (227kW/301PS)	2013 - 2014 MKZ
Specifications	Procedure revision date: 08/16/2013

Specifications

Engine

Item	Specification
Displacement	3.7L (4V) (226 CID)
No. of cylinders	6
Bore/stroke	3.760 ± 3.413 in ( 95.5 ± 86.7 mm)
Firing order	1-4-2-5-3-6
Spark plug	12405
Spark plug gap	1.25-1.35 mm (0.049-0.053 in)
Compression ratio	10.5:1
Engine weight (without accessory drive components)	354.9 lb ( 161 kg)
Engine and transaxle assembly weight (without accessory drive components)	575.0 lb ( 260.8 kg)

Lubricants

Item	Specification
Motorcraft® SAE 5W-20 Premium Synthetic Blend Motor Oil (US); Motorcraft® SAE 5W-20 Super Premium Motor Oil (Canada)	XO-5W20-QSP (US); CXO-5W20-LSP12 (Canada)

Engine Oil Capacity

Item	Specification
Service fill including oil filter	6.0 qt ( 5.68 L)

Oil Pressure

Item	Specification
Oil pressure @ 1,500 rpm with engine at normal operating temperature	30.0 psi ( 206.8 kPa)

Cylinder Head and Valve Train

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 –0.2157 in ( 5.479 –5.479 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

Camshaft

Item	Specification
Theoretical valve lift (intake) @ 0 lash	0.394 in ( 10 mm)
Theoretical valve lift (exhaust) @ 0 lash	0.38 in ( 9.6798 mm)
Lobe lift - intake	0.394 in ( 10 mm)
Lobe lift - exhaust	0.38 in ( 9.6798 mm)
Allowable lobe lift loss	0.0024 in ( .062 mm)
Camshaft journal bore inside diameter — 1st journal	1.537 –1.538 in ( 39.0375 –39.0625 mm)
Camshaft journal bore inside diameter — intermediate journals	1.023 –1.024 in ( 25.9875 –26.0125 mm)
Camshaft bearing outside diameter — 1st journal	1.535 –1.536 in ( 38.99 –39.01 mm)
Camshaft bearing outside diameter — intermediate journals	1.021 –1.022 in ( 25.937 –25.963 mm)
Camshaft journal-to-bearing clearance, 1st journal — service limit	0.0029 in ( .0725 mm)
Camshaft journal-to-bearing clearance, intermediate journals — service limit	0.0030 in ( .0755 mm)
Runout	0.0016 in ( .04 mm)
End play - standard	0.0013 –0.0067 in ( .032 –.17 mm)
End play - service limit	0.0075 in ( .19 mm)

Cylinder Block

Item	Specification
Cylinder bore diameter	3.760 –3.761 in ( 95.5 –95.52 mm)
Cylinder bore roundness	0.0005 in ( .013 mm)
Cylinder bore taper	0.0004 in ( .01 mm)
Block main bore roundness	0.000 in ( .008 mm)
Main bearing bore inside diameter	2.850 –2.851 in ( 72.4 –72.424 mm)
Head gasket surface flatness	Flat within 0.150 mm (0.005 in) overall 0.050 mm (0.001 in) per 150 mm (5.905 in) x 150 mm (5.905 in) 0.025 mm (0.0009 in) per 25 mm (0.98 in) x 25 mm (0.98 in)

Crankshaft

Item	Specification
Main bearing journal diameter	2.657 in ( 67.5 mm)
Main bearing journal maximum taper	0.1575 in ( .004 m)
Main bearing journal maximum out-of-round	0.0002 in ( .006 mm)
Main bearing journal-to-main bearing clearance	0.0010 –0.0016 in ( .026 –.041 mm)
Connecting rod journal diameter	2.204 –2.205 in ( 55.983 –56.003 mm)
Connecting rod journal maximum taper	0.0002 in ( .004 mm)
Connecting rod journal maximum out-of-round	0.0002 in ( .006 mm)
Crankshaft maximum end play	0.0020 –0.0115 in ( .051 –.291 mm)

Piston and Connecting Rod

Item	Specification
Piston diameter - single grade	3.7594 –3.7589 in ( 95.49 –95.476 mm)
Piston-to-cylinder bore clearance	0.0004 –0.0017 in ( .01 –.044 mm)
Piston ring end gap - compression (top, gauge diameter)	0.0067 –0.0106 in ( .17 –.27 mm)
Piston ring end gap - compression (bottom, gauge diameter)	0.0118 –0.0217 in ( .3 –.55 mm)
Piston ring end gap — oil ring (steel rail, gauge diameter)	0.0059 –0.0177 in ( .15 –.45 mm)
Piston ring groove width - compression (top)	0.0484 –0.0492 in ( 1.23 –1.25 mm)
Piston ring groove width — compression (bottom)	0.0602 –0.0610 in ( 1.53 –1.55 mm)
Piston ring groove width - oil ring	0.0996 –0.1004 in ( 2.53 –2.55 mm)
Piston ring width - upper compression ring	0.0461 –0.0469 in ( 1.17 –1.19 mm)
Piston ring width - lower compression ring	0.0579 –0.0587 in ( 1.47 –1.49 mm)
Piston ring-to-groove clearance (upper and lower compression rings)	0.0016 –0.0031 in ( .04 –.08 mm)
Piston pin bore diameter	0.9057 –0.9058 in ( 23.004 –23.008 mm)
Piston pin diameter	0.9054 –0.9055 in ( 22.997 –23 mm)
Piston pin length	2.204 in ( 55.975 mm)
Piston pin-to-piston fit	0.0002 –0.0004 in ( .004 –.011 mm)
Piston-to-connecting rod clearance	0.1 in ( 2.7 mm)
Connecting rod-to-pin clearance - standard	0.0003 –0.0009 in ( .007 –.022 mm)
Connecting rod pin bore diameter	0.9058 –0.9063 in ( 23.007 –23.019 mm)
Connecting rod length (center-to-center)	6.01 in ( 152.68 mm)
Connecting rod maximum allowed bend	0.0015 in ( .038 mm)
Connecting rod maximum allowed twist	0.0020 in ( .05 mm)
Connecting rod bearing bore diameter - grade 1	2.3569 –2.3572 in ( 59.866 –59.872 mm)
Connecting rod bearing bore diameter - grade 2	2.3572 –2.3574 in ( 59.873 –59.879 mm)
Connecting rod bearing bore diameter - grade 3	2.3575 –2.3577 in ( 59.88 –59.886 mm)
Connecting rod bearing-to-crankshaft clearance	0.0008 –0.0021 in ( .02 –.054 mm)
Connecting rod side clearance (assembled to crank) - standard	0.0069 –0.0167 in ( .175 –.425 mm)
Connecting rod side clearance (assembled to crank) - service limit	0.0069 –0.0167 in ( .175 –.425 mm)