Crankshaft, Engine

GENERAL SPECIFICATIONS

Cylinder Block
Cylinder bore diameter 100.4 mm (3.953 inch)
Cylinder bore maximum taper 0.025 mm (0.001 inch)
Cylinder bore maximum out-of-round 0.025 mm (0.001 inch)
Main bearing bore inside diameter 60.634 - 60.620 mm (2.387 - 2.387 inch)
Head gasket surface flatness 0.1 mm (0.004 inch) overall
Head gasket surface finish (RMS) 60 - 150

Crankshaft
Main bearing journal diameter 56.980 - 57.0 mm (2.243 - 2.244 inch)
Main bearing journal maximum taper 0.008 mm (0.0003 inch)
Main bearing journal maximum out-of-round 0.008 mm (0.0003 inch)
Main bearing journal-to-cylinder block clearance 0.008 - 0.062 mm (0.0003 - 0.0024 inch)
Connecting rod journal diameter 53.98 - 54.0 mm (2.125 - 2.126 inch)
Connecting rod journal maximum taper 0.008 mm (0.0003 inch)
Connecting rod journal maximum out-of-round 0.008 mm (0.0003 inch)
Crankshaft maximum end play 0.05 - 0.32 mm (0.002 - 0.0126 inch)

Main Bearings
Clearance to crankshaft 0.021 - 0.039 mm (0.0008 - 0.0015 inch)
Clearance to crankshaft allowable 0.013 - 0.048 mm (0.0005 - 0.002 inch)
Bearing wall thickness 1.8 - 1.806 mm (0.0709 - 0.0711 inch)

Piston
Piston diameter coded STD 100.380 - 100.400 mm (3.952 - 3.9528 inch)
Piston diameter coded 0.5 100.880 - 100.900 mm (3.972 inch)
Piston diameter coded 1.0 101.350 - 101.370 mm (3.990 - 3.991 inch)
Piston-to-cylinder bore clearance 0.030 - 0.060 mm (0.0012 - 0.002 inch)
Piston pin bore diameter (red) 24.007 - 24.010 mm (0.945 inch)
Piston pin bore diameter (blue) 24.010 - 24.013 mm (0.945 inch)
Piston pin diameter (red) 23.994 - 23.997 mm (0.9446 - 0.9447 inch)
Piston pin diameter (blue) 23.997 - 24.000 mm (0.9447 - 0.9449 inch)
Piston pin length 72.0 - 72.8 mm (2.835 - 2.866 inch)
Piston pin-to-piston pin fit 0.01 - 0.016 mm (0.0004 - 0.0006 inch)
Piston pin-to-connecting rod clearance Press fit 0.018 to 0.042 mm (0.0007 to 0.0017 inch)

Piston Ring
Piston top ring end gap 0.200 - 0.450 mm (0.008 - 0.018 inch)
Piston bottom ring end gap 0.450 - 0.700 mm (0.018 - 0.028 inch)
Piston top ring groove width 1.64 - 1.66 mm (0.0645 - 0.0654 inch)
Piston bottom ring groove width 1.79 - 1.81 mm (0.0705 - 0.0713 inch)
Piston oil ring groove width 3.5 - 3.53 mm (0.1378 - 0.1399 inch)
Piston top ring width 1.578 - 1.598 mm (0.062 - 0.063 inch)
Piston bottom ring width 1.728 - 1.74 mm (0.068 - 0.069 inch)
Piston top ring-to-groove clearance 0.050 - 0.082 mm (0.002 - 0.0003 inch)
Piston bottom ring-to-groove clearance 0.050 - 0.082 mm (0.002 - 0.003 inch)

Connecting Rod
Connecting rod pin bore diameter 23.958 - 23.976 mm (0.943 - 0.944 inch)
Connecting rod length 145.965 - 146.035 mm (5.746 - 5.749 inch)
Connecting rod maximum allowed bend 0.0125 mm (0.00049 inch) per 25.4 mm (1.000 inch)
Connecting rod maximum allowed twist 0.038 mm (0.0015 inch) per 25.4 mm (1.000 inch)
Connecting rod bearing bore diameter 56.82 - 56.84 mm (2.237 inch)
Connecting rod bearing-to-crankshaft clearance 0.013 - 0.048 mm (0.005 - 0.002 inch)
Connecting rod side clearance (assembled to crankshaft) 0.092 - 0.268 mm (0.0036 - 0.0106 inch)

a. The addition of Motorcraft Cooling System Stop Leak Pellets, VC6, darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.
b. Tighten camshaft bearing cap bolts to 15 Nm (11 ft. lbs.) when measuring journal clearance.