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Section 7 (Engine Mechanical (H4SO)): General Description: Specifications

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GENERAL SPECIFICATIONS

Engine Type Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine
Valve arrangement Belt driven, single over-head camshaft, 4-valve/cylinder
Bore x Stroke mm (in) 99.5 x 79.0 (3.917 x 3.110)
Displacement cm3 (cu in) 2,457 (150)
Compression ratio 10.0
Compression pressure (at 200 - 300 rpm) kPa (kg/cm2 , psi) 1,079 - 1,275 (11.0 - 13.0, 156 - 185)
Number of piston rings Pressure ring: 2, Oil ring: 1
Intake valve timing Opening 1° BTDC
Closing 51° ABDC
Exhaust valve timing Opening 50° BBDC
Closing 6° ATDC
Valve clearance Intake mm (in) 0.20±0.04 (0.0079±0.0016)
Exhaust mm (in) 0.25±0.04 (0.0098±0.0016)
Idling speed [At neutral position on MT, or "P" or "N" position on AT] rpm MT: 650±100 (No load)
AT: 700±100 (No load)
850±100 (A/C switch ON)
Firing order 1 → 3 → 2 → 4
Ignition timing BTDC/rpm MT: 10°±8°/650
AT: 15°±8°/700
BELT TENSIONER ADJUSTER SPECIFICATIONS

Belt tensioner adjuster Protrusion of adjuster rod 5.2 - 6.2 mm (0.205 - 0.244 in)
Belt tensioner Spacer O.D. 17.955 - 17.975 mm (0.7069 - 0.7077 in)
Tensioner bushing I.D. 18.00 - 18.08 mm (0.7087 - 0.7118 in)
Clearance between spacer and bushing Standard 0.025 - 0.125 mm (0.0010 - 0.0049 in)
Limit 0.175 mm (0.0069 in)
Side clearance of spacer Standard 0.20 - 0.55 mm (0.0079 - 0.0217 in)
Limit 0.81 mm (0.0319 in)
Valve rocker arm Clearance between shaft and arm Standard 0.020 - 0.054 mm (0.0008 - 0.0021 in)
Limit 0.10 mm (0.0039 in)
Camshaft Bend limit 0.025 mm (0.0010 in)
Thrust clearance Standard 0.030 - 0.090 mm (0.0012 - 0.0035 in)
Limit 0.10 mm (0.0039 in)
Cam lobe height Intake Standard 39.485 - 39.585 mm (1.5545 - 1.5585 in)
Limit 39.385 mm (1.5506 in)
Exhaust Standard 39.259 - 39.359 mm (1.5456 - 1.5496 in)
Limit 39.159 mm (1.5417 in)
Camshaft journal O.D. 31.928 - 31.945 mm (1.2570 - 1.2577 in)
Camshaft journal hole I.D. 32.000 - 32.018 mm (1.2598 - 1.2605 in)
Journal clearance Standard 0.055 - 0.090 mm (0.0022 - 0.0035 in)
Limit 0.10 mm (0.0039 in)
Cylinder head Surface warpage limit (mating surface with cylinder block) 0.035 mm (0.014 in)
Surface grinding limit 0.1 mm (0.004 in)
Standard height 97.5 mm (3.839 in)
Valve set Refacing angle 90°
Contacting width Intake Standard 1.1 mm (0.043 in)
Limit 1.8 mm (0.071 in)
Exhaust Standard 1.5 mm (0.059 in)
Limit 2.2 mm (0.087 in)
Valve guide Inner diameter 6.000 - 6.012 mm (0.2362 - 0.2367 in)
Protrusion above head Intake 20.0 - 21.0 mm (0.787 - 0.827 in)
Exhaust 16.5 - 17.5 mm (0.650 - 0.689 in)
Valve Head edge thickness Intake Standard 1.0 mm (0.039 in)
Limit 0.6 mm (0.024 in)
Exhaust Standard 1.2 mm (0.047 in)
Limit 0.6 mm (0.024 in)
Stem diameter Intake 5.950 - 5.965 mm (0.2343 - 0.2348 in)
Exhaust 5.945 - 5.960 mm (0.2341 - 0.2346 in)
Stem oil clearance Standard Intake 0.035 - 0.062 mm (0.0014 - 0.0024 in)
Exhaust 0.040 - 0.067 mm (0.0016 - 0.0026 in)
Limit - 0.15 mm (0.0059 in)
Overall length Intake 120.6 mm (4.75 in)
Exhaust 121.7 mm (4.79 in)
Valve spring Free length 54.30 mm (2.1378 in)
Squareness 2.5°, 2.4 mm (0.094 in) or less
Tension/spring height Set 214 - 246 N (22 - 25 kgf, 48 - 55 lb)/ 45.0 mm (1.772 in)
Lift 526 - 582 N (54 - 59 kgf, 119 - 130 lb)/ 34.7 mm (1.366 in)
Cylinder block Surface warpage limit (mating surface with cylinder head) 0.025 mm (0.0010 in)
Surface grinding limit 0.1 mm (0.004 in)
Cylinder bore Standard A 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B 99.495 - 99.505 mm (3.9171 - 3.9175 in)
Taper Standard 0.015 mm (0.0006 in)
Limit 0.050 mm (0.0020 in)
Out-of-roundness Standard 0.010 mm (0.0004 in)
Limit 0.050 mm (0.0020 in)
Piston clearance 0.010 - 0.030 mm (0.0004 - 0.0012 in)*1 -0.010 - 0.010 (-0.0004 - 0.0004)*2
Enlarging (boring) limit 0.5 mm (0.020 in)
Piston Outer diameter Standard A 99.485 - 99.495 mm (3.9167 - 3.9171 in)
B 99.475 - 99.485 mm (3.9163 - 3.9167 in)
0.25 mm (0.0098 in) OS 99.725 - 99.745 mm (3.9262 - 3.9270 in)
0.50 mm (0.0197 in) OS 99.975 - 99.995 mm (3.9360 - 3.9368 in)
Standard inner diameter of piston pin hole 23.000 - 23.006 mm (0.9055 - 0.9057 in)
Piston pin Outer diameter 22.994 - 23.000 mm (0.9053 - 0.9055 in)
Standard clearance between piston pin and hole in piston 0.004 - 0.008 mm (0.0002 - 0.0003 in)
Degree of fit Piston pin must be fitted into position with thumb at 20°C (68°F).
Piston ring Piston ring gap Top ring Standard 0.20 - 0.35 mm (0.0079 - 0.0138 in)
Limit 1.0 mm (0.039 in)
Second ring Standard 0.37 - 0.52 mm (0.0146 - 0.0205 in)
Limit 1.0 mm (0.039 in)
Oil ring Standard 0.20 - 0.50 mm (0.0079 - 0.0197 in)
Limit 1.5 mm (0.059 in)
Clearance between piston ring and piston ring groove Top ring Standard 0.040 - 0.080 mm (0.0016 - 0.0031 in)
Limit 0.15 mm (0.0059 in)
Second ring Standard 0.030 - 0.070 mm (0.0012 - 0.0028 in)
Limit 0.15 mm (0.0059 in)
Connecting rod Bend twist per 100 mm (3.94 in) in length Limit 0.10 mm (0.0039 in)
Side clearance Standard 0.070 - 0.330 mm (0.0028 - 0.0130 in)
Limit 0.4 mm (0.016 in)
Connecting rod bearing Oil clearance Standard 0.016 - 0.044 (0.0006 - 0.0017 in)
Limit 0.05 mm (0.0020 in)
Thickness at center portion Standard 1.492 - 1.501 mm (0.0587 - 0.0591 in)
0.03 mm (0.0012 in) US 1.510 - 1.513 mm (0.0594 - 0.0596 in)
0.05 mm (0.0020 in) US 1.520 - 1.523 mm (0.0598 - 0.0600 in)
0.25 mm (0.0098 in) US 1.620 - 1.623 mm (0.0638 - 0.0639 in)
Connecting rod bushing Clearance between piston pin and bushing Standard 0 - 0.022 mm (0 - 0.0009 in)
Limit 0.030 mm (0.0012 in)
Crankshaft Bend limit 0.035 mm (0.0014 in)
Crank pin Out of roundness 0.003 mm (0.0001 in)
Cylindricality 0.004 mm (0.0002 in)
Grinding limit (Diameter) 51.750 mm (2.0374 in)
Crank journal Out of roundness 0.005 mm (0.0002 in)
Cylindricality 0.006 mm (0.0002 in)
Grinding limit (Diameter) 59.750 mm (2.3524 in)
Crank pin outer diameter Standard 51.984 - 52.000 mm (2.0466 - 2.0472 in)
0.03 mm (0.0012 in) US 51.954 - 51.970 mm (2.0454 - 2.0461 in)
0.05 mm (0.0020 in) US 51.934 - 51.950 mm (2.0446 - 2.0453 in)
0.25 mm (0.0098 in) US 51.734 - 51.750 mm (2.0368 - 2.0374 in)
Crank journal outer diameter #1 - #5 Standard 59.992 - 60.008 mm (2.3619 - 2.3625 in)
0.03 mm (0.0012 in) US 59.962 - 59.978 mm (2.3607 - 2.3613 in)
0.05 mm (0.0020 in) US 59.942 - 59.958 mm (2.3599 - 2.3605 in)
0.25 mm (0.0098 in) US 59.742 - 59.758 mm (2.3520 - 2.3527 in)
Thrust clearance Standard 0.030 - 0.115 mm (0.0012 - 0.0045 in)
Limit 0.25 mm (0.0098 in)
Oil clearance #1 - #5 Standard 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit 0.040 mm (0.0016 in)
Crankshaft bearing Crankshaft bearing thickness #1, #3 Standard 1.998 - 2.011 mm (0.0787 - 0.0792 in)
0.03 mm (0.0012 in) US 2.017 - 2.020 mm (0.0794 - 0.0795 in)
0.05 mm (0.0020 in) US 2.027 - 2.030 mm (0.0798 - 0.0799 in)
0.25 mm (0.0098 in) US 2.127 - 2.130 mm (0.0837 - 0.0839 in)
#2, #4, #5 Standard 2.000 - 2.013 mm (0.0787 - 0.0793 in)
0.03 mm (0.0012 in) US 2.019 - 2.022 mm (0.0795 - 0.0796 in)
0.05 mm (0.0020 in) US 2.029 - 2.032 mm (0.0799 - 0.0800 in)
0.25 mm (0.0098 in) US 2.129 - 2.132 mm (0.0838 - 0.0839 in)
I.D.: Inner Diameter O.D.: Outer Diameter US: Undersize OS: Oversize
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