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Section 124 (Engine Mechanical (H4SO)): General Description: Specifications

WARNING: This page is about a different car, the 2002 Subaru Outback and 2002 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  1. STD: Standard
  2. I.D.: Inner Diameter
  3. O.D.: Outer Diameter
  4. US: Undersize
  5. OS: Oversize
MECHANICAL 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) 1,020 - 1,275 (10.4 - 13.0, 148 - 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 ± 0.02 (0.0079 ± 0.0008)
Exhaust mm (in) 0.25 ± 0.02 (0.0098 ± 0.0008)
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 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 bush I.D. 18.00 - 18.08 mm (0.7087 - 0.7118 in)
Clearance between spacer and bush STD 0.025 - 0.125 mm (0.0010 - 0.0049 in)
Limit 0.175 mm (0.0069 in)
Side clearance of spacer STD 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 STD 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 STD 0.030 - 0.090 mm (0.0012 - 0.0035 in)
Limit 0.10 mm (0.0039 in)
Cam lobe height Intake STD 39.485 - 39.585 mm (1.5545 - 1.5585 in)
Limit 39.385 mm (1.5506 in)
Exhaust STD 39.257 - 39.357 mm (1.5455 - 1.5495 in)
Limit 39.157 mm (1.5416 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)
Oil clearance STD 0.055 - 0.090 mm (0.0022 - 0.0035 in)
Limit 0.10 mm (0.0039 in)
Cylinder head Surface warpage limit 0.05 mm (0.0020 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 STD 1.0 mm (0.039 in)
Limit 1.7 mm (0.067 in)
Exhaust STD 1.4 mm (0.055 in)
Limit 2.1 mm (0.083 in)
Valve guide Inner diameter 6.000 - 6.012 mm (0.2362 - 0.2367 in)
Protrusion above head Intake 20.0 - 20.5 mm (0.787 - 0.807 in)
Exhaust 16.5 - 17.0 mm (0.650 - 0.669 in)
Valve Head edge thickness Intake STD 1.0 mm (0.039 in)
Limit 0.6 mm (0.024 in)
Exhaust STD 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 STD 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)
Tension/spring height 214.8 - 246.2 N (21.9 - 25.1 kgf, 48.3 - 55.3 lb)/ 45.0 mm (1.772 in) 526.6 - 581.6 N (53.7 - 59.3 kgf, 118.4 - 130.8 lb)/34.7 mm (1.366 in)
Cylinder block Surface warpage limit (mating with cylinder head) 0.05 mm (0.0020 in)
Surface grinding limit 0.1 mm (0.004 in)
Cylinder bore STD A 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B 99.495 - 99.505 mm (3.9171 - 3.9175 in)
Taper STD 0.015 mm (0.0006 in)
Limit 0.050 mm (0.0020 in)
Out-of-roundness STD 0.010 mm (0.0004 in)
Limit 0.050 mm (0.0020 in)
Piston clearance STD 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit 0.050 mm (0.0020 in)
Enlarging (boring) limit 0.5 mm (0.020 in)
Piston Outer diameter STD 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 - 99.735 mm (3.9262 - 3.9266 in)
0.50 mm (0.0197 in) OS 99.975 - 99.985 mm (3.9360 - 3.9364 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 STD 0.20 - 0.35 mm (0.0079 - 0.0138 in)
Limit 1.0 mm (0.039 in)
Second ring STD 0.35 - 0.50 mm (0.0138 - 0.0197 in)
Limit 1.0 mm (0.039 in)
Oil ring STD 0.20 - 0.70 mm (0.0079 - 0.0276 in)
Limit 1.5 mm (0.059 in)
Clearance between piston ring and piston ring groove Top ring STD 0.040 - 0.080 mm (0.0016 - 0.0031 in)
Limit 0.15 mm (0.0059 in)
Second ring STD 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 STD 0.070 - 0.330 mm (0.0028 - 0.0130 in)
Limit 0.4 mm (0.016 in)
Connecting rod bearing Oil clearance STD 0.020 - 0.046 mm (0.0008 - 0.0018 in)
Limit 0.05 mm (0.0020 in)
Thickness at center portion STD 1.486 - 1.498 mm (0.0585 - 0.0590 in)
0.03 mm (0.0012 in) US 1.504 - 1.512 mm (0.0592 - 0.0595 in)
0.05 mm (0.0020 in) US 1.514 - 1.522 mm (0.0596 - 0.0599 in)
0.25 mm (0.0098 in) US 1.614 - 1.622 mm (0.0635 - 0.0639 in)
Connecting rod bushing Clearance between piston pin and bushing STD 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 and crank journal Out-of-roundness 0.020 mm (0.0008 in) or less
Grinding limit 0.250 mm (0.0098 in)
Crank pin outer diameter STD 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, #3 STD 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)
#2, #4 STD 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 STD 0.030 - 0.115 mm (0.0012 - 0.0045 in)
Limit 0.25 mm (0.0098 in)
Oil clearance STD 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit 0.040 mm (0.0016 in)
Crankshaft bearing Crankshaft bearing thickness #1, #3 STD 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 STD 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)
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