Section 27 (Engine Mechanical (H4DOTC)): General Description: Specification
WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
GENERAL SPECIFICATIONS
| Engine | Cylinder arrangement | Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine | |||
| Valve system mechanism | Belt driven, double overhead camshaft, 4-valve/cylinder | ||||
| Bore x Stroke | mm (in) | 99.5 x 79.0 (3.92 x 3.11) | |||
| Displacement | cm3 (cu in) | 2,457 (149.94) | |||
| Compression ratio | 8.2 | ||||
| Compression pressure (at 400 RPM) | kPa (kg/cm2 , psi) | 981 - 1,177 (10 - 12, 142 - 171) | |||
| Number of piston rings | Pressure ring: 2, Oil ring: 1 | ||||
| Intake valve timing | Open | Max. retard | ATDC 5° | ||
| Min. advance | BTDC 15° | ||||
| Close | Max. retard | ABDC 65° | |||
| Min. advance | ABDC 45° | ||||
| Exhaust valve timing | Open | BBDC 55° | |||
| Close | ATDC 5° | ||||
| Valve clearance | mm (in) | Intake | 0.20±0.02 (0.0079±0.0008) | ||
| Exhaust | 0.35±10.02 (0.0138±0.0008) | ||||
| Idle RPM ["P" or "N" range] | RPM | No load | 750±100 | ||
| A/C ON | 875±100 | ||||
| Ignition order | 1 → 3 → 2 → 4 | ||||
| Ignition timing | BTDC/RPM | MT model | 12°±10/°750 | ||
| AT model | 17°±10/°750 | ||||
| NOTE: OS: Oversize US: Undersize |
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BELT TENSION ADJUSTER SPECIFICATIONS
| Belt tension adjuster | Protrusion of adjuster rod | mm (in) | 5.2 - 6.2 (0.205 - 0.244) | ||
| Belt tensioner | Spacer O.D. | mm (in) | 17.955 - 17.975 (0.7069 - 0.7077) | ||
| Tensioner bushing I.D. | mm (in) | 18.0 - 18.08 (0.7087 - 0.7118) | |||
| Clearance between spacer and bushing | mm (in) | Standard | 0.025 - 0.125 (0.0010 - 0.0049) | ||
| Side clearance of spacer | mm (in) | Standard | 0.2 - 0.55 (0.0079 - 0.0217) | ||
| Camshaft | Bending limit | mm (in) | 0.020 (0.0079) or less | ||
| Side clearance | mm (in) | Standard | 0.068 - 0.116 (0.0027 - 0.0047) | ||
| Cam lobe height | mm (in) | Intake | Standard | 46.55 - 46.65 (1.833 - 1.837) | |
| Exhaust | Standard | 46.75 - 46.85 (1.841 - 1.844) | |||
| Journal O.D. | mm (in) | Standard | Front | 37.946 - 37.963 (1.4939 - 1.4946) | |
| Center rear | 29.946 - 29.963 (1.1790 - 1.1796) | ||||
| Journal clearance | mm (in) | Standard | 0.037 - 0.072 (0.0015 - 0.0028) | ||
| Cylinder head | Surface warpage limit | mm (in) | 0.035 (0.0014) | ||
| Grinding limit | mm (in) | 0.3 (0.012) | |||
| Standard height | mm (in) | 127.5 (5.02) | |||
| Valve seat | Seating angle | 90° | |||
| Contacting width | mm (in) | Intake | Standard | 0.6 - 1.4(0.024 - 0.055) | |
| Exhaust | Standard | 1.2 - 1.8 (0.047 - 0.071) | |||
| Valve guide | Inside diameter | mm (in) | 6.000 - 6.012 (0.2362 - 0.2367) | ||
| Protrusion above head | mm (in) | 15.8 - 16.2 (0.622 - 0.638) | |||
| Valve | Head edge thickness | mm (in) | Intake | Standard | 1.0 - 1.4 (0.039 - 0.055) |
| Exhaust | Standard | 1.3 - 1.7 (0.051 - 0.067) | |||
| Stem outer diameter | mm (in) | Intake | 5.955 - 5.970 (0.2344 - 0.2350) | ||
| Exhaust | 5.945 - 5.960 (0.2341 - 0.2346) | ||||
| Valve stem gap | mm (in) | Standard | Intake | 0.030 - 0.057 (0.0012 - 0.0022) | |
| Exhaust | 0.040 - 0.067 (0.0016 - 0.0026) | ||||
| Overall length | mm (in) | Intake | 104.4 (4.110) | ||
| Exhaust | 104.65 (4.1201) | ||||
| Valve spring | Free length | mm (in) | 47.32 (1.863) | ||
| Squareness | 2.5°, 2.1 mm (0.083 in) | ||||
| Tension/spring height | N (kgf, lb)/mm (in) | Set | 205 - 235 (20.9 - 24.0,46.1 - 52.8)/36.0 (1.417) | ||
| Lift | 426 - 490 (43.4 - 50.0, 95.8 - 110)/26.50 (1.043) | ||||
| Cylinder block | Surface warpage limit (Mating surface with cylinder head) | mm (in) | 0.025 (0.0098) | ||
| Grinding limit | mm (in) | 0.1 (0.004) | |||
| Standard height | mm (in) | 201.0 (7.91) | |||
| Cylinder inner diameter | mm (in) | Standard | A | 99.505 - 99.515 (3.9175 - 3.9179) | |
| B | 99.495 - 99.505 (3.9171 - 3.9175) | ||||
| Taper | mm (in) | Standard | 0.015 (0.0006) | ||
| Out-of-roundness | mm (in) | Standard | 0.010 (0.0004) | ||
| Piston clearance | mm (in) | Standard | -0.010 - 0.010 (-0.00039 - 0.00039) | ||
| Piston | Outer diameter | mm (in) | Standard | A | 99.505 - 99.515 (3.9175 - 3.9179) |
| B | 99.495 - 99.505 (3.9171 - 3.9175) | ||||
| 0.25 (0.0098) OS | 99.745 - 99.765 (3.9270 - 3.9278) | ||||
| 0.50 (0.0197) OS | 99.995 - 100.015 (3.9368 - 3.9376) | ||||
| Piston pin | Standard clearance between piston and piston pin | mm (in) | Standard | 0.004 - 0.008 (0.0002 - 0.0003) | |
| Degree of fit | Piston pin must be fitted into position with thumb at 20°C (68°F). | ||||
| Piston ring | Ring closed gap | mm (in) | Top ring | Standard | 0.20 - 0.25 (0.0079 - 0.0098) |
| Second ring | Standard | 0.37 - 0.52 (0.015 - 0.0203) | |||
| Oil ring | Standard | 0.20 - 0.50 (0.0079 - 0.0197) | |||
| Ring groove gap | mm (in) | Top ring | Standard | 0.040 - 0.080 (0.0016 - 0.0031) | |
| Second ring | Standard | 0.030 - 0.070 (0.0012 - 0.0028) | |||
| Connecting rod | Bend or twist per 100 mm (3.94 in) in length | mm (in) | Limit | 0.10 (0.0039) | |
| Side clearance of large end | mm (in) | Standard | 0.070 - 0.330 (0.0028 - 0.0130) | ||
| Bearing of large end | Oil clearance | mm (in) | Standard | 0.017 - 0.045 (0.0007 - 0.0018) | |
| Bearing size (Thickness at center) | mm (in) | Standard | 1.490 - 1.502 (0.0587 - 0.0591) | ||
| 0.03 (0.0012) US | 1.504 - 1.512 (0.0592 - 0.0595) | ||||
| 0.05 (0.0020) US | 1.514 - 1.522 (0.0596 - 0.0599) | ||||
| 0.25 (0.0098) US | 1.614 - 1.622 (0.0635 - 0.0639) | ||||
| Bushing of small end | Clearance between piston pin and bushing | mm (in) | Standard | 0 - 0.022 (0 - 0.0009) | |
| Crankshaft | Bending limit | mm (in) | 0.035 (0.0014) | ||
| Crank pin | Out-of-roundness | mm (in) | 0.003 (0.0001) | ||
| Cylindrically | mm (in) | 0.004 (0.0002) | |||
| Grinding limit (dia.) | mm (in) | To 51.750 (2.0374) | |||
| Crank journal | Out-of-roundness | mm (in) | 0.005 (0.0002) | ||
| Cylindrically | mm (in) | 0.006 (0.0002) | |||
| Grinding limit (dia.) | mm (in) | To 59.750 (2.3524) | |||
| Crank pin outer diameter | mm (in) | Standard | 51.984 - 52.000 (2.0466 - 2.0472) | ||
| 0.03 (0.0012) US | 51.954 - 51.970 (2.0454 - 2.0461) | ||||
| 0.05 (0.0020) US | 51.934 - 51.950 (2.0447 - 2.0453) | ||||
| 0.25 (0.0098) US | 51.734 - 51.750 (2.0368 - 2.0374) | ||||
| Crank journal outer diameter | mm (in) | Standard | 59.992 - 60.008 (2.3619 - 2.3625) | ||
| 0.03 (0.0012) US | 59.962 - 59.978 (2.3607 - 2.3613) | ||||
| 0.05 (0.0020) US | 59.942 - 59.958 (2.3599 - 2.3605) | ||||
| 0.25 (0.0098) US | 59.742 - 59.758 (2.3520 - 2.3527) | ||||
| Side clearance | mm (in) | Standard | 0.030 - 0.115 (0.0012 - 0.0045) | ||
| Oil clearance | mm (in) | 0.010 - 0.030 (0.0004 - 0.0012) | |||
| Main bearing | Bearing size (Thickness at center) mm (in) | #1, #3 | Standard | 1.998 - 2.011 (0.0787 - 0.0792) | |
| 0.03 (0.0012) US | 2.017 - 2.020 (0.0794 - 0.0795) | ||||
| 0.05 (0.0020) US | 2.027 - 2.030 (0.0798 - 0.0799) | ||||
| 0.25 (0.0098) US | 2.127 - 2.130 (0.0837 - 0.0839) | ||||
| #2, #4, #5 | Standard | 2.000 - 2.013 (0.0787 - 0.0793) | |||
| 0.03 (0.0012) US | 2.019 - 2.022 (0.0795 - 0.0796) | ||||
| 0.05 (0.0020) US | 2.029 - 2.032 (0.0799 - 0.0800) | ||||
| 0.25 (0.0098) US | 2.129 - 2.132 (0.0838 - 0.0839) | ||||