MECHANICAL(H4SO) > General Description
|
Engine |
Model |
2.5 L | ||
|
Cylinder arrangement |
Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine | |||
|
Valve system mechanism |
Belt driven Single overhead camshaft 4 valve/4 cylinder | |||
|
Bore × Stroke |
mm (in) |
99.5 × 79.0 (3.917 × 3.110) | ||
|
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 |
Open |
BTDC 2° | ||
|
Close |
ABDC 56° | |||
|
Exhaust valve timing |
Open |
BBDC 50° | ||
|
Close |
ATDC 8° | |||
|
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 |
650±100 (No load) 800±100 (A/C ON) | ||
|
Ignition order |
1 → 3 → 2 → 4 | |||
|
Ignition timing |
BTDC/rpm |
13°±10°/650 | ||
NOTE:
US: undersize OS: oversize
|
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) |
18.00 — 18.08 (0.7087 — 0.7118) | ||||
|
Clearance between spacer and bushing |
mm(in) |
Standard |
0.025 — 0.125 (0.0010 — 0.0049) | |||
|
Limit |
0.175 (0.0069) | |||||
|
Spacer side clearance |
mm(in) |
Standard |
0.20 — 0.55 (0.0079 — 0.0217) | |||
|
Limit |
0.81 (0.0319) | |||||
|
Valve rocker arm |
Clearance between shaft and arm |
mm (in) |
Standard |
0.020 — 0.054 (0.0008 — 0.0021) | ||
|
Limit |
0.10 (0.0039) | |||||
|
Camshaft |
Bending limit |
mm (in) |
0.025 (0.0010) | |||
|
Thrust clearance |
mm (in) |
Standard |
0.030 — 0.090 (0.0012 — 0.0035) | |||
|
Limit |
0.10 (0.0039) | |||||
|
Cam lobe height |
mm (in) |
Intake |
Standard |
39.485 — 39.585 (1.5545 — 1.5585) | ||
|
Service limit: |
39.385 (1.5506) | |||||
|
Exhaust |
Standard |
39.904 — 40.004 (1.5710 — 1.5750) | ||||
|
Limit |
39.804 (1.5559) | |||||
|
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) | |||
|
Limit |
0.10 (0.0039) | |||||
|
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) | ||
|
Limit |
1.7 (0.067) | |||||
|
Exhaust |
Standard |
1.2 — 1.8 (0.047 — 0.071) | ||||
|
Limit |
2.2 (0.087) | |||||
|
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) | |
|
Limit |
0.6 (0.024) | |||||
|
Exhaust |
Standard |
1.0 — 1.4 (0.039 — 0.055) | ||||
|
Limit |
0.6 (0.024) | |||||
|
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) |
54.30 (2.1378) | |||
|
Squareness |
2.5°, 2.4 mm (0.094 in) or less | |||||
|
Tension/spring height |
N (kgf, lb)/mm (in) |
Set |
214 — 246 (22 — 25, 48 — 55)/45.0 (1.772) | |||
|
Lift |
526 — 582 (54 — 59, 119 — 130)/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) | |||
|
Limit |
0.050 (0.0020) | |||||
|
Out-of-roundness |
mm (in) |
Standard |
0.010 (0.0004) | |||
|
Limit |
0.050 (0.0020) | |||||
|
Piston clearance |
mm (in) |
Standard |
−0.010 — 0.010 (−0.00039 — 0.00039) | |||
|
Limit |
0.030 (0.0012) | |||||
|
Limit of cylinder boring (inner diameter) |
mm (in) |
To 100.005 (3.9372) | ||||
|
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) | |||
|
Limit |
0.020 (0.0008) | |||||
|
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) | |
|
Limit |
1.0 (0.039) | |||||
|
Second ring |
Standard |
0.37 — 0.52 (0.0144 — 0.0203) | ||||
|
Limit |
1.0 (0.039) | |||||
|
Oil ring |
Standard |
0.20 — 0.50 (0.0079 — 0.0197) | ||||
|
Limit |
1.5 (0.059) | |||||
|
Ring groove gap |
mm (in) |
Top ring |
Standard |
0.040 — 0.080 (0.0016 — 0.0031) | ||
|
Limit |
0.15 (0.0059) | |||||
|
Second ring |
Standard |
0.030 — 0.070 (0.0012 — 0.0028) | ||||
|
Limit |
0.15 (0.0059) | |||||
|
Connecting rod |
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) | |||
|
Limit |
0.4 (0.016) | |||||
|
Bearing of large end |
Oil clearance |
mm (in) |
Standard |
0.016 — 0.044 (0.00063 — 0.0017) | ||
|
Limit |
0.05 (0.0020) | |||||
|
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) | ||
|
Limit |
0.030 (0.0012) | |||||
|
Crankshaft |
Bend limit |
mm (in) |
0.035 (0.0014) | |||
|
Crank pin |
Out-of-roundness |
mm (in) |
0.003 (0.0001) | |||
|
Cylindricality |
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) | |||
|
Cylindricality |
mm (in) |
0.006 (0.0002) | ||||
|
Grinding limit (dia.) |
mm (in) |
To 59.758 (2.3527) | ||||
|
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) | |||
|
Limit |
0.25 (0.0098) | |||||
|
Oil clearance |
mm (in) |
Standard |
0.010 — 0.030 (0.0001 — 0.0012) | |||
|
Limit |
0.40 (0.016) | |||||
|
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) | |||||