MECHANICAL(H4DOTC) > General Description
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Engine |
Model |
2.5 L | |||||
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Cylinder arrangement |
Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine | ||||||
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Valve system mechanism |
Belt driven, double overhead camshaft, 4-valve/cylinder | ||||||
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Bore × Stroke |
mm (in) |
99.5 × 79.0 (3.92 × 3.11) | |||||
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Displacement |
cm3 (cu in) |
2,457 (149.94) | |||||
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Compression ratio |
8.4 | ||||||
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Compression pressure (at 200 — 300 rpm) |
kPa (kg/cm2, psi) |
Standard |
981 — 1,177 (10 — 12, 142 — 171) | ||||
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Number of piston rings |
Pressure ring: 2, Oil ring: 1 | ||||||
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Intake valve timing |
Open |
Max. retard |
ATDC 5° | ||||
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Min. advance |
BTDC 35° | ||||||
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Close |
Max. retard |
ABDC 65° | |||||
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Min. advance |
ABDC 25° | ||||||
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Exhaust valve timing |
Open |
BBDC 55° | |||||
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Close |
ATDC 5° | ||||||
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Valve clearance |
mm (in) |
Inspection value |
Intake |
0.20+0.04 −0.06 (0.0079+0.0016 −0.0024) | |||
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Exhaust |
0.35±0.05 (0.0138±0.0020) | ||||||
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Adjustment value |
Intake |
0.20+0.01 −0.03 (0.0079+0.0004 −0.0012) | |||||
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Exhaust |
0.35±0.02 (0.0138±0.0008) | ||||||
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Idle speed (Gear shift lever is in neutral) |
rpm |
No load |
Standard |
750±100 | |||
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A/C ON |
Standard |
800±100 | |||||
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Ignition order |
1 → 3 → 2 → 4 | ||||||
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Ignition timing |
BTDC/rpm |
Standard |
12°±10°/750 | ||||
NOTE:
OS: Oversize US: Undersize
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Belt tension adjuster |
Adjuster rod protrusion amount |
mm (in) |
5.2 — 6.2 (0.205 — 0.244) | ||||
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Camshaft |
Bending limit |
mm (in) |
0.020 (0.00079) | ||||
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Cam lobe height |
mm (in) |
Intake |
Standard |
46.55 — 46.65 (1.833 — 1.837) | |||
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Exhaust |
Standard |
46.75 — 46.85 (1.841 — 1.844) | |||||
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Cam base circle diameter |
mm (in) |
Standard |
37.0 (1.457) | ||||
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Journal O.D. |
mm (in) |
Front |
Standard |
37.946 — 37.963 (1.4939 — 1.4946) | |||
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Center, rear |
Standard |
29.946 — 29.963 (1.1790 — 1.1796) | |||||
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Oil clearance |
mm (in) |
Standard |
0.037 — 0.072 (0.0015 — 0.0028) | ||||
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Thrust clearance |
mm (in) |
Standard |
0.068 — 0.116 (0.0027 — 0.0047) | ||||
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Cylinder head |
Warping limit (Mating surface with cylinder block) |
mm (in) |
0.035 (0.0014) | ||||
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Grinding limit |
mm (in) |
0.3 (0.012) | |||||
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Standard height |
mm (in) |
127.5 (5.02) | |||||
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Valve seat |
Seating angle between valve and valve seat |
90° | |||||
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Contacting width of valve and valve seat |
mm (in) |
Intake |
Standard |
0.6 — 1.4 (0.024 — 0.055) | |||
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Exhaust |
Standard |
1.2 — 1.8 (0.047 — 0.071) | |||||
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Valve guide |
Clearance between the valve guide and valve stem |
mm (in) |
Intake |
Standard |
0.030 — 0.057 (0.0012 — 0.0022) | ||
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Exhaust |
Standard |
0.040 — 0.067 (0.0016 — 0.0026) | |||||
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Inside diameter |
mm (in) |
6.000 — 6.012 (0.2362 — 0.2367) | |||||
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Valve stem outer diameter |
mm (in) |
Intake |
5.955 — 5.970 (0.2344 — 0.2350) | ||||
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Exhaust |
5.945 — 5.960 (0.2341 — 0.2346) | ||||||
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Valve guide protrusion amount |
mm (in) |
15.8 — 16.2 (0.622 — 0.638) | |||||
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Valve |
Head edge thickness |
mm (in) |
Intake |
Standard |
1.0 — 1.4 (0.039 — 0.055) | ||
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Exhaust |
Standard |
1.3 — 1.7 (0.051 — 0.067) | |||||
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Overall length |
mm (in) |
Intake |
104.4 (4.110) | ||||
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Exhaust |
104.65 (4.1201) | ||||||
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Valve spring |
Free length |
mm (in) |
47.32 (1.863) | ||||
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Tension/spring height |
N (kgf, lb)/mm (in) |
Set |
205 — 235 (20.9 — 24.0, 46.1 — 52.8)/36.0 (1.417) | ||||
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Lift |
426 — 490 (43.4 — 50.0, 95.8 — 110)/26.50 (1.043) | ||||||
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Squareness |
2.5°, 2.1 mm (0.083 in) or less | ||||||
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Valve lifter |
Outer diameter |
mm (in) |
Standard |
34.959 — 34.975 (1.3763 — 1.3770) | |||
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Inner diameter of valve lifter mating surface |
mm (in) |
Standard |
34.994 — 35.016 (1.3777 — 1.3786) | ||||
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Clearance between valve lifter and valve lifter mating surface |
mm (in) |
Standard |
0.019 — 0.057 (0.0007 — 0.0022) | ||||
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Cylinder block |
Warping limit (Mating surface with cylinder head) |
mm (in) |
0.025 (0.0098) | ||||
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Grinding limit |
mm (in) |
0.1 (0.004) | |||||
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Standard height |
mm (in) |
201.0 (7.91) | |||||
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Taper |
mm (in) |
Standard |
0.015 (0.0006) | ||||
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Out-of-roundness |
mm (in) |
Standard |
0.010 (0.0004) | ||||
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Cylinder to piston clearance at 20°C (68°F): |
mm (in) |
Standard |
−0.010 — 0.010 (−0.00039 — 0.00039) | ||||
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Cylinder inner diameter boring limit (diameter) |
mm (in) |
To 100.005 (3.9372) | |||||
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Piston |
Piston grade point |
mm (in) |
38.2 (1.50) | ||||
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Outer diameter |
mm (in) |
Standard |
A |
99.505 — 99.515 (3.9175 — 3.9179) | |||
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B |
99.495 — 99.505 (3.9171 — 3.9175) | ||||||
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0.25 (0.0098) OS |
99.745 — 99.765 (3.9270 — 3.9278) | ||||||
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0.50 (0.0197) OS |
99.995 — 100.015 (3.9368 — 3.9376) | ||||||
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Piston pin |
Degree of fit |
Piston pin must be fitted into position with thumb at 20°C (68°F). | |||||
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Clearance between piston pin hole and piston pin |
mm (in) |
Standard |
0.004 — 0.008 (0.0002 — 0.0003) | ||||
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Piston ring |
Piston ring gap |
mm (in) |
Top ring |
Standard |
0.20 — 0.25 (0.0079 — 0.0098) | ||
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Second ring |
Standard |
0.37 — 0.52 (0.015 — 0.0203) | |||||
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Oil ring |
Standard |
0.20 — 0.50 (0.0079 — 0.0197) | |||||
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Clearance between piston ring and piston ring groove |
mm (in) |
Top ring |
Standard |
0.040 — 0.080 (0.0016 — 0.0031) | |||
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Second ring |
Standard |
0.030 — 0.070 (0.0012 — 0.0028) | |||||
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Connecting rod and connecting rod bearing |
Bend or twist per 100 mm (3.94 in) in length |
mm (in) |
Service limit |
0.10 (0.0039) | |||
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Thrust clearance |
mm (in) |
Standard |
0.070 — 0.330 (0.0028 — 0.0130) | ||||
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Oil clearance |
mm (in) |
Standard |
0.017 — 0.045 (0.0007 — 0.0018) | ||||
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Bearing size (Thickness at center) |
mm (in) |
Standard |
1.490 — 1.502 (0.0587 — 0.0591) | ||||
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0.03 (0.0012) US |
1.504 — 1.512 (0.0592 — 0.0595) | ||||||
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0.05 (0.0020) US |
1.514 — 1.522 (0.0596 — 0.0599) | ||||||
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0.25 (0.0098) US |
1.614 — 1.622 (0.0635 — 0.0639) | ||||||
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Bushing of small end |
Clearance between piston pin and bushing |
mm (in) |
Standard |
0 — 0.022 (0 — 0.0009) | |||
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Crankshaft and crankshaft bearing |
Bending limit |
mm (in) |
0.035 (0.0014) | ||||
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Crank pin |
Out-of-roundness |
mm (in) |
0.003 (0.0001) | ||||
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Cylindricality |
mm (in) |
0.004 (0.0002) | |||||
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Grinding limit (dia.) |
mm (in) |
To 51.750 (2.0374) | |||||
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Crank journal |
Out-of-roundness |
mm (in) |
0.005 (0.0002) | ||||
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Cylindricality |
mm (in) |
0.006 (0.0002) | |||||
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Grinding limit (dia.) |
mm (in) |
To 59.758 (2.3527) | |||||
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Crank pin outer diameter |
mm (in) |
Standard |
51.984 — 52.000 (2.0466 — 2.0472) | ||||
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0.03 (0.0012) US |
51.954 — 51.970 (2.0454 — 2.0461) | ||||||
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0.05 (0.0020) US |
51.934 — 51.950 (2.0447 — 2.0453) | ||||||
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0.25 (0.0098) US |
51.734 — 51.750 (2.0368 — 2.0374) | ||||||
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Crank journal outer diameter |
mm (in) |
Standard |
59.992 — 60.008 (2.3619 — 2.3625) | ||||
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0.03 (0.0012) US |
59.962 — 59.978 (2.3607 — 2.3613) | ||||||
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0.05 (0.0020) US |
59.942 — 59.958 (2.3599 — 2.3605) | ||||||
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0.25 (0.0098) US |
59.742 — 59.758 (2.3520 — 2.3527) | ||||||
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Bearing size (Thickness at center) |
mm (in) |
#1, #3 |
Standard |
1.998 — 2.011 (0.0787 — 0.0792) | |||
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0.03 (0.0012) US |
2.017 — 2.020 (0.0794 — 0.0795) | ||||||
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0.05 (0.0020) US |
2.027 — 2.030 (0.0798 — 0.0799) | ||||||
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0.25 (0.0098) US |
2.127 — 2.130 (0.0837 — 0.0839) | ||||||
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#2, #4, #5 |
Standard |
2.000 — 2.013 (0.0787 — 0.0793) | |||||
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0.03 (0.0012) US |
2.019 — 2.022 (0.0795 — 0.0796) | ||||||
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0.05 (0.0020) US |
2.029 — 2.032 (0.0799 — 0.0800) | ||||||
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0.25 (0.0098) US |
2.129 — 2.132 (0.0838 — 0.0839) | ||||||
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Thrust clearance |
mm (in) |
Standard |
0.030 — 0.115 (0.0012 — 0.0045) | ||||
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Oil clearance |
mm (in) |
Standard |
0.010 — 0.030 (0.0004 — 0.0012) | ||||