Section 17 (Engine Mechanical (H4SO)): 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
| Model | 2.5 L | |||
|---|---|---|---|---|
| Engine | Cylinder arrangement | Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine | ||
| Valve system mechanism | Belt driven Single overhead camshaft 4 valve cylinder | |||
| Bore x Stroke | mm (in) | 99.5x79.0 (3.917x3.110) | ||
| Piston displacement | cm3 (cu. in) | 2,457(150) | ||
| Compression ratio | 10.0 | |||
| Compression pressure (at 350 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 | Constant | Open | BTDC 0° | |
| Close | ABDC 58° | |||
| Low speed | Open | BTDC 0° | ||
| Close | ABDC -50° | |||
| High speed | Open | BTDC 14° | ||
| Close | ABDC 62° | |||
| Exhaust valve timing | Open | BBDC46° | ||
| Close | ATDC14° | |||
| Valve clearance | mm (in) | Intake | 0.20±0.04 (0.0079±0.0016) | |
| Exhaust | 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(Noload) 850±100 (A/C ON) |
|
| AT | 700±100(Noload) 850±100 (A/CON) |
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| Ignition order | 1 → 3 → 2 → 4 | |||
| Ignition Timing | BTDC/ | MT | 10°±8°/650 | |
| RPM | AT | 15°±8°/700 | ||
| US: undersize OS: oversize | ||||
BELT TENSION ADJUSTER SPECIFICATION
| Belt tension adjuster | Protrusion of adjuster rod | mm (in) | 5.2 - 6.2 (0.205 - 0.244) | |||
| Bolt tensioner | Spacer O.D. | mm (in) | 17.955 - 17.975 (0.7069 - 0.7077) | |||
| Tensioner bushing I.D. | mm (in) | 18.00 - 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 | 0.20 - 0.55 (0.0079 - 0.0217) | |||
| Valve rocker arm | Clearance between shaft and arm | mm (in) | Standard | 0.020 - 0.054 (0.0008 - 0.0021) | ||
| Camshaft | Bending limit | mm (in) | 0.025(0.0010) | |||
| Thrust clearance | mm (in) | Standard | 0.030 - 0.090 (0.0012 - 0.0035) | |||
| Cam lobe height | mm (in) | Intake | Constant | Standard | 40.075 - 40.175 (1.5778 - 1.5817) | |
| Low speed | Standard | 35.182 - 35.282(1.3851 -1.3891) | ||||
| High speed | Standard | 40.315 - 40.415 (1.5872 - 1.5911) | ||||
| Exhaust | Standard | 40.088 - 40.188 (1.5783 - 1.5822) | ||||
| Camshaft journal O.D. | mm (in) | 31.928 - 31.945 (1.2570 - 1.2577) | ||||
| Camshaft journal hole I.D. | mm (in) | 32.000 - 32.018 (1.2598 - 1.2605) | ||||
| Oil clearance | mm (in) | Standard | 0.055 - 0.090 (0.0022 - 0.0035) | |||
| Cylinder head | Surface warpage limit (Mating surface with cylinder block) | mm (in) | 0.03(0.001) | |||
| Grinding limit | mm (in) | 0.1 (0.004) | ||||
| Standard height | mm (in) | 97.5 (3.84) | ||||
| Valve seat | Seating angle | 90° | ||||
| Contacting width | mm (in) | Intake | Standard | 0.8-1.4(0.03 - 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) | Intake | 20.0 - 21.0 (0.787 - 0.827) | |||
| Exhaust | 16.5-17.5(0.650 - 0.689) | |||||
| Valve | Head edge thickness | mm (in) | Intake | Standard | 0.8-1.2(0.03 - 0.047) | |
| Exhaust | Standard | 1.0 - 1.4 (0.039 - 0.055) | ||||
| Stem outer diameter | mm (in) | Intake | 5.950 - 5.965 (0.2343 - 0.2348) | |||
| Exhaust | 5.945 - 5.960 (0.2341 - 0.2346) | |||||
| Valve stem gap | mm (in) | Standard | Intake | 0.035 - 0.062 (0.0014 - 0.0024) | ||
| Exhaust | 0.040 - 0.067 (0.0016 - 0.0026) | |||||
| Limit | - | 0.15(0.0059) | ||||
| Overall length | mm (in) | Intake | 120.6 (4.75) | |||
| Exhaust | 121.7 (4.79) | |||||
| Valve spring | Free length | mm (in) | 55.2(2.173) | |||
| Squareness | 2.5°, 2.4 (0.094) or less | |||||
| Tension/spring height | N (kgf, lb)/mm (in) | Set | 235.3 - 270.7 (24 - 27.6, 52.9 - 60.8)/ 45.0(1.772) | |||
| Lift | 578.9 - 639.9 (59.1 - 65.3, 130.3 - 143.9)/34.7 (1.366) | |||||
| Cylinder block | Surface warpage limit (mating with cylinder head) | mm (in) | 0.025 (0.00098) | |||
| 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) | |||
| Cylinder boring limit (Diameter) | mm (in) | 0.5 (0.020) | ||||
| 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 specified diameter | mm (in) | 23.000 - 23.006 (0.9055 - 0.9057) | ||||
| Piston pin | Outer diameter | mm (in) | 22.994 - 23.000 (0.9053 - 0.9055) | |||
| 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 - 0.35 (0.0079 - 0.0138) | |
| Second ring | Standard | 0.37 - 0.52 (0.0144 - 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 | 0.016 - 0.044 (0.00063 - 0.0017) | ||
| Bearing size (Thickness at center) | mm (in) | Standard | 1.492 - 1.501 (0.0587 - 0.0591) | |||
| 0.03(0.0012) US | 1.510-1.513 (0.0594 - 0.0596) | |||||
| 0.05 (0.0020) US | 1.520 - 1.523 (0.0598 - 0.0600) | |||||
| 0.25 (0.0098) US | 1.620 - 1.623 (0.0638 - 0.0639) | |||||
| Bushing of small end | Clearance between piston pin and bushing | mm (in) | Standard | 0 - 0.022 (0 - 0.0009) | ||
| Crankshaft | Bend 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 (2.0446 - 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) | |||||
| Thrust clearance | mm (in) | Standard | 0.030 - 0.115 (0.0012 - 0.0045) | |||
| Oil clearance | mm (in) | Standard | 0.010 - 0.030 (0.0001 - 0.0012) | |||
| Main bearing | Main bearing | 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) | |||||
| US: undersize OS: oversize | ||||||