MECHANICAL(H4DO) > General Description

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 × Stroke			mm (in)			94.0 × 90.0 (3.70 × 3.54)
	Displacement		cm³ (cu in)				2,498 (152)
	Compression ratio						10.3
	Compression pressure (at 200 — 300 r/min)	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 37°
						Open	ATDC 11°
	Cam clearance	mm (in)	Intake			Standard	0.13^+0.02 _−0.03 (0.0051^+0.0008 _−0.0012)
			Exhaust			Standard	0.22±0.02 (0.0087±0.0008)
	Idle speed (For CVT model, select lever in “P” or “N” range. For MT model, gear shift lever in neutral position.)		r/min	No load		Standard	CVT model: 675±100
							MT model: 650±100
				A/C ON		Standard	800 — 900±100
	Ignition order						1 → 3 → 2 → 4
	Ignition timing		BTDC/{r/min}			Standard	CVT model: 5°±10°/675
							MT model: 6°±10°/650

NOTE:

OS: Oversize US: Undersize

Camshaft	Bending						mm (in)	Limit	0.020 (0.00079)
	Cam lobe height				mm (in)	Intake		Standard	40.34 — 40.44 (1.588 — 1.592)
						Exhaust		Standard	39.66 — 39.76 (1.561 — 1.565)
	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	0.020 (0.00079)
	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		104.95 (4.132)
							Exhaust		96.5 (3.799)
	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	CVT model: 41.68 (1.641)
									MT model: 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	CVT model: 502 — 554 (51.19 — 56.49, 112.87 — 124.56)/22.0 (0.866)
									MT model: 552 — 610 (56.29 — 62.20, 124.11 — 137.15)/22.0 (0.866)
	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	0.030 (0.0012)
	Out-of-roundness of cylinder liner						mm (in)	Limit	0.030 (0.0012)
	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 — 0.25 (0.0079 — 0.0098)
						Second ring		Standard	0.25 — 0.35 (0.0098 — 0.0138)
			Oil ring (upper rail and lower rail)					Standard	0.10 — 0.35 (0.0039 — 0.0138)
	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 — 68.003 (2.6766 — 2.6773)
						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	2.498 — 2.513 (0.0983 — 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	2.496 — 2.511 (0.0983 — 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)