Engine Mechanical (H4DO): General Description: Specification
| 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 | Compression ring: 2 Oil ring: 1 | ||||
| Intake valve timing | Open | Max. retard | ATDC 16° | ||
| Min. advance | BTDC 39° | ||||
| Close | Max. retard | ABDC 80° | |||
| Min. advance | ABDC 25° | ||||
| Exhaust valve timing | Open | BBDC 35° | |||
| Open | ATDC 13° | ||||
| Cam clearance | mm (in) | Intake | Standard | 0.13±0.03 (0.0051±0.0012) | |
| Exhaust | Standard | 0.24±0.03 (0.0094±0.0012) | |||
| Idle speed (For CVT model, select lever in "P" or "N" range. For MT model, gear shift lever in neutral position.) | rpm | No load | Standard | CVT model: 675±100 | |
| MT model: 650±100 | |||||
| A/C ON | Standard | CVT model: 700±100 | |||
| MT model: 800 - 850±100 | |||||
| Ignition order | 1 → 3 → 2 → 4 | ||||
| Ignition timing | BTDC/rpm | Standard | CVT model: 16°±10°/675 | ||
| MT model: 16°±10°/650 | |||||
NOTE:
OS: Oversize US: Undersize
| Camshaft | Bending | mm (in) | Limit | 0.020 (0.00079) | ||||
| Cam lobe height | mm (in) | Intake | Standard | 40.77 - 40.87 (1.605 - 1.609) | ||||
| Exhaust | Standard | 40.15 - 40.25 (1.581 - 1.585) | ||||||
| Cam base circle diameter | mm (in) | Standard | 34.0 (1.339) | |||||
| Journal outer diameter | mm (in) | Standard | 25.946 - 25.963 (1.0215 - 1.0222) | |||||
| Thrust clearance | mm (in) | Standard | 0.068 - 0.116 (0.0027 - 0.0047) | |||||
| Oil clearance | mm (in) | Standard | 0.037 - 0.072 (0.0015 - 0.0028) | |||||
| Cylinder head | Warpage (mating surface with cylinder block) | mm (in) | Limit | 0.035 (0.0014) | ||||
| Grinding limit | mm (in) | To 98.4 (3.874) | ||||||
| Height | mm (in) | Standard | 98.5 (3.878) | |||||
| Valve & valve guide | Valve overall length | mm (in) | Intake | 103.3 (4.067) | ||||
| Exhaust | 94.1 (3.705) | |||||||
| 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) | ||||||
| Valve stem outer diameter | mm (in) | Intake | Standard | 5.455 - 5.470 (0.2148 - 0.2154) | ||||
| Exhaust | Standard | 5.445 - 5.460 (0.2144 - 0.2150) | ||||||
| Valve guide inner diameter | mm (in) | Standard | 5.500 - 5.512 (0.2165 - 0.2170) | |||||
| Clearance between valve and valve guide | mm (in) | Intake | Standard | 0.030 - 0.057 (0.0012 - 0.0022) | ||||
| Exhaust | Standard | 0.040 - 0.067 (0.0016 - 0.0026) | ||||||
| Valve guide protrusion amount | mm (in) | Standard | 11.4 - 11.8 (0.449 - 0.465) | |||||
| Valve & valve shim | Valve stem end outer diameter | mm (in) | Intake | Standard | 5.455 - 5.470 (0.2148 - 0.2154) | |||
| Exhaust | Standard | 5.445 - 5.460 (0.2148 - 0.2150) | ||||||
| Valve shim inner diameter | mm (in) | Standard | 5.500 - 5.560 (0.2165 - 0.2189) | |||||
| Clearance between valve and valve shim | mm (in) | Intake | Standard | 0.030 - 0.105 (0.0012 - 0.0041) | ||||
| Exhaust | Standard | 0.040 - 0.115 (0.0016 - 0.0045) | ||||||
| Valve seat | Seating 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) | ||||||
| Seating angle between valve and valve seat | 45° | |||||||
| Seating position between valve and valve seat | Valve face center | |||||||
| 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) |
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| Lift | Standard | 552 - 610 (56.29 - 62.20, 124.11 - 137.15)/22.0 (0.866) |
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| Squareness | Standard | 2.5°, 1.8 mm (0.071 in) or less | ||||||
| Cylinder block & piston | Cylinder block warpage (Mating surface with cylinder head) |
mm (in) | Limit | 0.025 (0.00098) | ||||
| Grinding limit of cylinder block | mm (in) | To 204.9 (8.067) | ||||||
| Height of cylinder block | mm (in) | Standard | 205.0 (8.071) | |||||
| Inner diameter of cylinder liner | mm (in) | Cylinder bore size mark A | Standard | 94.005 - 94.015 (3.7010 - 3.7014) | ||||
| Cylinder bore size mark B | Standard | 93.995 - 94.005 (3.7006 - 3.7010) | ||||||
| Cylindricality of cylinder liner | mm (in) | Limit | 0.015 (0.0006) | |||||
| Out-of-roundness of cylinder liner | mm (in) | Limit | 0.010 (0.0004) | |||||
| Piston grade point | mm (in) | 13.3 (0.52) | ||||||
| Piston outer diameter | mm (in) | Standard Size | Grade A | Standard | 93.980 - 93.990 (3.7000 - 3.7004) | |||
| Grade B | Standard | 93.970 - 93.980 (3.6996 - 3.7000) | ||||||
| 0.25 (0.0098) OS | Standard | 94.220 - 94.240 (3.7094 - 3.7102) | ||||||
| 0.50 (0.0197) OS | Standard | 94.470 - 94.490 (3.7193 - 3.7201) | ||||||
| Clearance between cylinder liner and piston | 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 and piston pin | Degree of fit | Piston pin must be fitted into position with thumb at 20°C (68°F). | ||||||
| Clearance between piston and piston pin | mm (in) | Standard | 0.004 - 0.008 (0.0002 - 0.0003) | |||||
| Piston ring | Closed gap | mm (in) | Compression ring | Top ring | Standard | 0.20 - 0.30 (0.0079 - 0.0118) | ||
| Second ring | Standard | 0.30 - 0.45 (0.0118 - 0.0177) | ||||||
| Oil ring (upper rail and lower rail) | Standard | 0.20 - 0.50 (0.0079 - 0.0197) | ||||||
| Clearance between compression ring and piston | 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) | |||||
| Connecting rod bearing thickness (at center) | mm (in) | Standard size | Standard | 1.492 - 1.508 (0.0587 - 0.0594) | ||||
| 0.03 (0.0012) US | Standard | 1.511 - 1.515 (0.0595 - 0.0596) | ||||||
| 0.05 (0.0020) US | Standard | 1.521 - 1.525 (0.0599 - 0.0600) | ||||||
| 0.25 (0.0098) US | Standard | 1.621 - 1.625 (0.0638 - 0.0640) | ||||||
| Oil clearance | mm (in) | Standard | 0.017 - 0.047 (0.0007 - 0.0019) | |||||
| Piston pin & connecting rod bushing | Clearance between piston pin and connecting rod bushing | mm (in) | Standard | 0.004 - 0.026 (0.0002 - 0.0010) | ||||
| Crankshaft and crankshaft bearing | Bending | mm (in) | Limit | 0.035 (0.0014) | ||||
| Crankshaft pin | Cylindricality | mm (in) | Limit | 0.006 (0.0002) | ||||
| Out-of-roundness | mm (in) | Limit | 0.005 (0.0002) | |||||
| Grinding limit (dia.) | mm (in) | To 47.726 (1.8790) | ||||||
| Crankshaft journal | Cylindricality | mm (in) | Limit | 0.006 (0.0002) | ||||
| Out-of-roundness | mm (in) | Limit | 0.005 (0.0002) | |||||
| Grinding limit (dia.) | mm (in) | To 67.735 (2.6667) | ||||||
| Crankshaft pin outer diameter | mm (in) | Standard size | Standard | 47.976 - 48.000 (1.8888 - 1.8898) | ||||
| 0.03 (0.0012) US | Standard | 47.946 - 47.970 (1.8876 - 1.8886) | ||||||
| 0.05 (0.0020) US | Standard | 47.926 - 47.950 (1.8868 - 1.8878) | ||||||
| 0.25 (0.0098) US | Standard | 47.726 - 47.750 (1.8790 - 1.8799) | ||||||
| Crankshaft journal outer diameter | mm (in) | Standard size | Standard | 67.985 - 68.009 (2.6766 - 2.6775) | ||||
| 0.03 (0.0012) US | Standard | 67.955 - 67.979 (2.6754 - 2.6763) | ||||||
| 0.05 (0.0020) US | Standard | 67.935 - 67.959 (2.6746 - 2.6755) | ||||||
| 0.25 (0.0098) US | Standard | 67.735 - 67.759 (2.6667 - 2.6677) | ||||||
| Crankshaft bearing thickness (at center) | mm (in) | #1, #2, #3, #4 | Standard size | Standard | 2.495 - 2.513 (0.0982 - 0.0989) | |||
| 0.03 (0.0012) US | Standard | 2.519 - 2.522 (0.0992 - 0.0993) | ||||||
| 0.05 (0.0020) US | Standard | 2.529 - 2.532 (0.0996 - 0.0997) | ||||||
| 0.25 (0.0098) US | Standard | 2.629 - 2.632 (0.1035 - 0.1036) | ||||||
| #5 | Standard size | Standard | 2.493 - 2.511 (0.0981 - 0.0989) | |||||
| 0.03 (0.0012) US | Standard | 2.517 - 2.520 (0.0991 - 0.0992) | ||||||
| 0.05 (0.0020) US | Standard | 2.527 - 2.530 (0.0995 - 0.0996) | ||||||
| 0.25 (0.0098) US | Standard | 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) | |||||