Section 178 (Engine Mechanical (H4DOTC)): General Description: Specifications
WARNING: This page is about a different car, the 2004 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter OS: Oversize US: Undersize
MECHANICAL SPECIFICATIONS CHART
| Engine | Type | Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine | |||
| Valve arrangement | Belt driven, double overhead camshaft, 4-valve/cylinder | ||||
| Bore x Stroke | mm (in) | 99.5 x 79.0 (3.917 x 3.110) | |||
| Piston displacement | cm3 (cu in) | 2,457 (150) | |||
| Compression ratio | 8.2 | ||||
| Compression pressure (at 200 - 300 rpm) | kPa (kgf/cm2 , psi) | 981 - 1,177 (10 - 12, 142 - 171) | |||
| Number of piston rings | Pressure ring: 2, Oil ring: 1 | ||||
| Intake valve timing | Opening | Max. retard | ATDC 5° | ||
| Min. advance | BTDC 15° | ||||
| Closing | Max. retard | ABDC 65° | |||
| Min. advance | ABDC 45° | ||||
| Exhaust valve timing | Opening | BBDC 55° | |||
| Closing | ATDC 5° | ||||
| Valve clearance | Intake | mm (in) | 0.20+0.04-0.06 (0.0079+0.0016-0.0024 ) | ||
| Exhaust | mm (in) | 0.35 ± 0.05 (0.0138 ± 0.0020) | |||
| Idling speed [At neutral position on MT, "P" or "N" position on AT] rpm | No load | M/T:700 ± 100 A/T: 750 ± 100 |
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| A/C ON | A/C refrigerant pressure low | M/T: 725 ± 100 A/T: 750 ± 100 |
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| A/C refrigerant pressure high | M/T: 800 ± 100 A/T: 825 ± 100 |
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| Firing order | 1 → 3 → 2 → 4 | ||||
| Ignition timing | BTDC/rpm | MT: 13° ± 10° AT: 17° ± 10° |
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| Belt tension 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. | 18.0 - 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 | 0.2 - 0.55 mm (0.0079 - 0.0217 in) | |||
| Limit | 0.81 mm (0.0319 in) | ||||
| Camshaft | Bend limit | 0.020 mm (0.0079 in) | |||
| Thrust clearance | STD | 0.068 - 0.116 mm (0.0027 - 0.0046 in) | |||
| Limit | 0.14 mm (0.0055 in) | ||||
| Cam lobe height | Intake | STD | 46.55 - 46.65 mm (1.833 - 1.837 in) | ||
| Limit | 46.45 mm (1.829 in) | ||||
| Exhaust | STD | 46.75 - 46.85 mm (1.841 - 1.844 in) | |||
| Limit | 46.65 mm (1.837 in) | ||||
| Journal O.D. | STD | Front | 37.946 - 37.963 mm (1.4939 - 1.4946 in) | ||
| Center rear | 29.946 - 29.963 mm (1.1790 - 1.1796 in) | ||||
| Oil clearance | STD | 0.037 - 0.072 mm (0.0015 - 0.0028 in) | |||
| Limit | 0.10 mm (0.0039 in) | ||||
| Cylinder head | Surface warpage limit | 0.05 mm (0.0020 in) | |||
| Surface grinding limit | 0.3 mm (0.012 in) | ||||
| Standard height | 127.5 mm (5.02 in) | ||||
| Valve seat | Refacing angle | 90° | |||
| Contacting width | Intake | STD | 1.0 mm (0.039 in) | ||
| Limit | 1.7 mm (0.067 in) | ||||
| Exhaust | STD | 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 | 15.8 - 16.2 mm (0.622 - 0.638 in) | ||||
| Valve | Head edge thickness | Intake | STD | 1.2 mm (0.047 in) | |
| Limit | 0.8 mm (0.031 in) | ||||
| Exhaust | STD | 1.5 mm (0.059 in) | |||
| Limit | 0.8 mm (0.031 in) | ||||
| Stem diameter | Intake | 5.955 - 5.970 mm (0.2344 - 0.2350 in) | |||
| Exhaust | 5.945 - 5.960 mm (0.2341 - 0.2346 in) | ||||
| Stem oil clearance | STD | Intake | 0.030 - 0.057 mm (0.0012 - 0.0022 in) | ||
| Exhaust | 0.040 - 0.067 mm (0.0016 - 0.0026 in) | ||||
| Limit | - | 0.15 mm (0.0059 in) | |||
| Overall length | Intake | 104.4 mm (4.110 in) | |||
| Exhaust | 104.65 mm (4.120 in) | ||||
| Valve spring | Free length | 47.32 mm (1.863 in) | |||
| Squareness | 2.5°, 2.1 mm (0.083 in) | ||||
| Tension/spring height | Set | 205 - 235 N (20.9 - 24.0 kgf, 46.1 - 52.8 lb)/36.0 mm (1.417 in) | |||
| Lift | 426 - 490 N (43.4 - 50.0 kgf, 95.8 - 110 lb)/26.50 mm (1.043 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) | ||||
| Standard height | 201.0 mm (7.91 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 - 0.010 mm (-0.0004 - 0.0004 in) | |||
| Limit | 0.030 mm (0.0012 in) | ||||
| Enlarging (boring) limit | 0.5 mm (0.020 in) | ||||
| Piston | Outer diameter | STD | A | 99.505 - 99.515 mm (3.9175 - 3.9179 in) | |
| B | 99.495 - 99.505 mm (3.9171 - 3.9175 in) | ||||
| 0.25 mm (0.0098 in) OS | 99.745 - 99.765 mm (3.9270 - 3.9278 in) | ||||
| 0.50 mm (0.0197 in) OS | 99.995 - 100.015 mm (3.9368 - 3.9376 in) | ||||
| Piston pin | Standard clearance between piston pin and hole in piston | STD | 0.004 - 0.008 mm (0.0002 - 0.0003 in) | ||
| Limit | 0.020 mm (0.0008 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 - 0.25 mm (0.0079 - 0.0098 in) | |
| Limit | 1.0 mm (0.039 in) | ||||
| Second ring | STD | 0.37 - 0.52 mm (0.015 - 0.020 in) | |||
| Limit | 1.0 mm (0.039 in) | ||||
| Oil ring | STD | 0.20 - 0.50 mm (0.0079 - 0.020 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 | 0.017 - 0.045 mm (0.0007 - 0.0018 in) | ||
| Limit | 0.05 mm (0.0020 in) | ||||
| Thickness at center portion | STD | 1.490 - 1.502 mm (0.0587 - 0.0591 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 | 0.005 mm (0.0002 in) or less | |||
| Grinding limit | 0.25 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 (2.0447 - 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, #3, #5 | 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 | #1 | STD | 0.003 - 0.030 mm (0.00012 - 0.0012 in) | ||
| Limit | 0.040 mm (0.0016 in) | ||||
| #2 | STD | 0.012 - 0.033 mm (0.0004 - 0.0012 in) | |||
| Limit | 0.045 mm (0.0018 in) | ||||
| #3 | STD | 0.003 - 0.030 mm (0.00012 - 0.0012 in) | |||
| Limit | 0.040 mm (0.0016 in) | ||||
| #4 | STD | 0.012 - 0.033 mm (0.0004 - 0.0012 in) | |||
| Limit | 0.045 mm (0.0018 in) | ||||
| #5 | STD | 0.010 - 0.031 mm (0.0004 - 0.0012 in) | |||
| Limit | 0.040 mm (0.0016 in) | ||||
| Crankshaft main bearing | Crankshaft main 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) | ||||