Section 112 (Engine Mechanical (H4DO)): General Description: Specification
WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
GENERAL SPECIFICATION CHART
| Engine | Model | 2.5 L | |||
| Cylinder arrangement | Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine | ||||
| Valve system mechanism | Chain driven, double overhead camshaft, 4-valve/cylinder | ||||
| Bore x Stroke | mm (in) | 94.0 x 90.0 (3.70 x 3.54) | |||
| Displacement | cm3 (cu in) | 2, 498 (152.43) | |||
| Compression ratio | 10 | ||||
| Compression pressure (at 200 - 300 rpm) | kPa (kg/cm2 psi) | Standard | 1, 050 - 1, 400 (11 - 14, 152 - 203) | ||
| Number of piston rings | Pressure ring: 2, Oil ring: 1 | ||||
| Intake valve timing | Open | Max. retard | ATDC 12° | ||
| Min. advance | BTDC 43° | ||||
| Close | Max. retard | ABDC 76° | |||
| Min. advance | ABDC 21° | ||||
| Exhaust valve timing | Open | BBDC 37° | |||
| Close | ATDC 11° | ||||
| Cam clearance | mm (in) | Intake | 0.13±0.03 (0.0051±0.0012) | ||
| Exhaust | 0.24±0.03 (0.0094±0.0012) | ||||
| Idling speed (Select lever is in "P" or "N" range on AT model; Gear shift lever is in neutral position on MT model.) | rpm | No load | Standard | AT model: 675±100 | |
| MT model: 650±100 | |||||
| A/C ON | Standard | 850±100 | |||
| Ignition order | 1 → 3 → 2 → 4 | ||||
| Ignition timing | BTDC/rpm | Standard | AT model: 16°±10°/675 | ||
| MT model: 16°°10°/650 | |||||
NOTE:
OS: Oversize US: Undersize
GENERAL SPECIFICATION CHART
| Camshaft | Bending limit | mm (in) | 0.020 (0.00079) | ||||
| Cam lobe height | mm (in) | Intake | Standard | 40.89 - 40.99 (1.610 - 1.614) | |||
| Exhaust | Standard | 40.15 - 40.25 (1.581 - 1.585) | |||||
| Cam base circle diameter | mm (in) | Standard | 34.0 (1.339) | ||||
| Journal O.D. | mm (in) | Standard | 25.946 - 25.963 (1.0215 - 1.0222) | ||||
| Oil clearance | mm (in) | Standard | 0.037 - 0.072 (0.0015 - 0.0028) | ||||
| Thrust clearance | mm (in) | Standard | 0.068 - 0.116 (0.0027 - 0.0047) | ||||
| Cylinder head | Warping limit (Mating surface with cylinder block) | mm (in) | 0.035 (0.0014) | ||||
| Grinding limit | mm (in) | 0.1 (0.004) | |||||
| Standard height | mm (in) | 98.5 (3.878) | |||||
| Valve seat | Seating angle between valve and valve seat | 90° | |||||
| Contacting width between valve and valve seat | mm (in) | Intake | Standard | 0.8 - 1.6 (0.031 - 0.063) | |||
| Exhaust | Standard | 1.1 - 1.7 (0.043 - 0.067) | |||||
| Valve guide | Clearance between the valve guide and valve stem | mm (in) | Intake | Standard | 0.030 - 0.057 (0.0012 - 0.0022) | ||
| Exhaust | Standard | 0.040 - 0.067 (0.0016 - 0.0026) | |||||
| Inside diameter | mm (in) | Standard | 5.500 - 5.512 (0.2165 - 0.2170) | ||||
| Valve stem outer diameters | mm (in) | Intake | Standard | 5.455 - 5.470 (0.2148 - 0.2154) | |||
| Exhaust | Standard | 5.445 - 5.460 (0.2144 - 0.2150) | |||||
| Valve guide protrusion amount | mm (in) | Standard | 11.4 - 11.8 (0.449 - 0.465) | ||||
| Valve | Head edge thickness | mm (in) | Intake | Standard | 0.8 - 1.2 (0.031 - 0.047) | ||
| Exhaust | Standard | 1.0 - 1.4 (0.039 - 0.055) | |||||
| Overall length | mm (in) | Intake | 103.8 (4.087) | ||||
| Exhaust | 94.1 (3.705) | ||||||
| Valve spring | Free length | mm (in) | Standard | 41.06 (1.617) | |||
| Tension/spring height | N (kgf, lb)/mm (in) | Set | Standard | 182 - 210 (18.56 - 21.41, 40.92 - 47.22)/33.0 (1.299) | |||
| Lift | Standard | 552 - 610 (56.29 - 62.20, 124.11 - 137.15)/22.0 (0.866) | |||||
| Squareness | Standard | 2.5°, 2.1 mm (0.083 in) or less | |||||
| Valve shim | Inside diameter | mm (in) | Standard | 5.500 - 5.560 (0.2165 - 0.2189) | |||
| Valve stem end outer diameters | mm (in) | Standard | 5.455 - 5.470 (0.2148 - 0.2154) | ||||
| Clearance between the valve shim and valve stem end | mm (in) | Standard | 0.030 - 0.105 (0.0012 - 0.0041) | ||||
| Cylinder block | Warping limit (Mating surface with cylinder head) | mm (in) | 0.025 (0.00098) | ||||
| Grinding limit | mm (in) | 0.1 (0.004) | |||||
| Standard height | mm (in) | 205.0 (8.07) | |||||
| Cylindrically | mm (in) | Standard | 0.015 (0.0006) | ||||
| Out-of-roundness | mm (in) | Standard | 0.010 (0.0004) | ||||
| Clearance between cylinder and piston at 20°C (68°F) | mm (in) | Standard | 0.015 - 0.035 (0.00059 - 0.00138) | ||||
| Inner diameter of cylinder liner boring limit (diameter) | mm (in) | To 94.505 (3.7207) | |||||
| Piston | Piston grade point | mm (in) | 13.3 (0.52) | ||||
| Outer diameter | mm (in) | Standard | A | 93.980 - 93.990 (3.7000 - 3.7004) | |||
| B | 93.970 - 93.980 (3.6996 - 3.7000) | ||||||
| 0.25 (0.0098) OS | 94.220 - 94.240 (3.7094 - 3.7102) | ||||||
| 0.50 (0.0197) OS | 94.470 - 94.490 (3.7193 - 3.7201) | ||||||
| Piston pin | Degree of fit | Piston pin must be fitted into position with thumb at 20°C (68°F). | |||||
| Clearance between piston pin hole and piston pin | mm (in) | Standard | 0.004 - 0.008 (0.0002 - 0.0003) | ||||
| Piston ring | Piston ring gap | mm (in) | Top ring | Standard | 0.20 - 0.30 (0.0079 - 0.0118) | ||
| Second ring | Standard | 0.30 - 0.45 (0.0118 - 0.0177) | |||||
| Oil ring | Standard | 0.20 - 0.50 (0.0079 - 0.0197) | |||||
| Clearance between piston ring and piston ring groove | 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 and connecting rod bearing | Bend or twist per 100 mm (3.94 in) in length | mm (in) | Limit | 0.10 (0.0039) | |||
| Thrust clearance | mm (in) | Standard | 0.070 - 0.330 (0.0028 - 0.0130) | ||||
| Oil clearance | mm (in) | Standard | 0.017 - 0.047 (0.0007 - 0.0019) | ||||
| Bearing size (Thickness at center) | mm (in) | Standard | 1.492 - 1.508 (0.0587 - 0.0594) | ||||
| 0.03 (0.0012) US | 1.511 - 1.515 (0.0595 - 0.0596) | ||||||
| 0.05 (0.0020) US | 1.521 - 1.525 (0.0599 - 0.0600) | ||||||
| 0.25 (0.0098) US | 1.621 - 1.625 (0.0638 - 0.0640) | ||||||
| Bushing of small end | Clearance between piston pin and bushing at connecting rod small end | mm (in) | Standard | 0.004 - 0.026 (0.0002 - 0.0010) | |||
| Crankshaft and crankshaft bearing | Bending limit | mm (in) | 0.035 (0.0014) | ||||
| Crank pin | Out-of-roundness | mm (in) | Standard | 0.005 (0.0002) | |||
| Cylindrically | mm (in) | Standard | 0.006 (0.0002) | ||||
| Grinding limit (dia.) | mm (in) | To 47.726 (1.8790) | |||||
| Crank journal | Out-of-roundness | mm (in) | Standard | 0.005 (0.0002) | |||
| Cylindrically | mm (in) | Standard | 0.006 (0.0002) | ||||
| Grinding limit (dia.) | mm (in) | To 67.735 (2.6667) | |||||
| Crank pin outer diameter | mm (in) | Standard | 47.976 - 48.000 (1.8888 - 1.8898) | ||||
| 0.03 (0.0012) US | 47.946 - 47.970 (1.8876 - 1.8886) | ||||||
| 0.05 (0.0020) US | 47.926 - 47.950 (1.8868 - 1.8878) | ||||||
| 0.25 (0.0098) US | 47.726 - 47.750 (1.8790 - 1.8799) | ||||||
| Crank journal outer diameter | mm (in) | Standard | 67.985 - 68.009 (2.6766 - 2.6775) | ||||
| 0.03 (0.0012) US | 67.955 - 67.979 (2.6754 - 2.6763) | ||||||
| 0.05 (0.0020) US | 67.935 - 67.959 (2.6746 - 2.6755) | ||||||
| 0.25 (0.0098) US | 67.735 - 67.759 (2.6667 - 2.6677) | ||||||
| Bearing size (Thickness at center) | mm (in) | #1,#2, #3, #4 | Standard | 2.495 - 2.513 (0.0982 - 0.0989) | |||
| 0.03 (0.0012) US | 2.519 - 2.522 (0.0992 - 0.0993) | ||||||
| 0.05 (0.0020) US | 2.529 - 2.532 (0.0996 - 0.0997) | ||||||
| 0.25 (0.0098) US | 2.629 - 2.632 (0.1035 - 0.1036) | ||||||
| #5 | Standard | 2.493 - 2.511 (0.0981 - 0.0989) | |||||
| 0.03 (0.0012) US | 2.517 - 2.520 (0.0991 - 0.0992) | ||||||
| 0.05 (0.0020) US | 2.527 - 2.530 (0.0995 - 0.0996) | ||||||
| 0.25 (0.0098) US | 2.627 - 2.630 (0.1034 - 0.1035) | ||||||
| Thrust clearance | mm (in) | Standard | 0.130 - 0.308 (0.00512 - 0.01213) | ||||
| Oil clearance | mm (in) | Standard | 0.013 - 0.031 (0.00051 - 0.00122) | ||||