R18 New Civic

Engine Electrical (R18A1, R18A3 engines)
Item Measurement Qualification Standard or New Service Limit
Ignition coil Rated voltage 12 V
Firing order 1-3-4-2
Spark plug Type NGK: IZFR6K11S
DENSO: SKJ20DR-M11S
Gap 1.0-1.1 mm (0.039-0.043 in.) ———
Ignition timing At idle
Check the red mark M/T (in neutral) 8±2 ° BTDC
A/T (in N or P position) 8±2 ° BTDC
Drive belt Tension Auto-tensioner
Alternator Output At 13.5 V and normal engine temperature 90 A
Coil (rotor) resistance At 20 °C (68 °F) 1.84-2.10 W
Slip ring O.D. 22.7 mm (0.89 in.) 21.2 mm (0.83 in.)
Brush length 19.0 mm (0.75 in.) 5.0 mm (0.20 in.)
Brush spring tension 3.3-4.1 N (0.34-0.42 kgf, 0.75-0.93 lbf)
Starter Output 1.0 kW
Commutator mica depth 0.50-0.80 mm (0.020-0.031 in.) 0.2 mm (0.008 in.)
Commutator runout 0.02 mm (0.001 in.) max. 0.05 mm (0.002 in.)
Commutator O.D. 28.0 mm (1.10 in.) 27.0 mm (1.06 in.)
Brush length 14.0-14.5 mm (0.55-0.57 in.) 9.0 mm (0.35 in.)
Brush spring tension 13.7-17.7 N (1.40-1.80 kgf, 3.09-3.97 lbf)

**Engine Electrical (R18A1, R18A3 engines)**
Item	Measurement	Qualification	Standard or New	Service Limit
Ignition coil	Rated voltage		12 V
Firing order		1-3-4-2
Spark plug	Type		NGK: IZFR6K11S DENSO: SKJ20DR-M11S
Gap		1.0-1.1 mm (0.039-0.043 in.)	———
Ignition timing	At idle Check the red mark	M/T (in neutral)	8±2 ° BTDC
A/T (in N or P position)	8±2 ° BTDC
Drive belt	Tension		Auto-tensioner
Alternator	Output	At 13.5 V and normal engine temperature	90 A
Coil (rotor) resistance	At 20 °C (68 °F)	1.84-2.10 W
Slip ring O.D.		22.7 mm (0.89 in.)	21.2 mm (0.83 in.)
Brush length		19.0 mm (0.75 in.)	5.0 mm (0.20 in.)
Brush spring tension		3.3-4.1 N (0.34-0.42 kgf, 0.75-0.93 lbf)
Starter	Output		1.0 kW
Commutator mica depth		0.50-0.80 mm (0.020-0.031 in.)	0.2 mm (0.008 in.)
Commutator runout		0.02 mm (0.001 in.) max.	0.05 mm (0.002 in.)
Commutator O.D.		28.0 mm (1.10 in.)	27.0 mm (1.06 in.)
Brush length		14.0-14.5 mm (0.55-0.57 in.)	9.0 mm (0.35 in.)
Brush spring tension		13.7-17.7 N (1.40-1.80 kgf, 3.09-3.97 lbf)

Engine Assembly (R18A1, R18A3 engines)
Item Measurement Qualification Standard or New Service Limit
Compression Pressure
Check the engine with the starter cranking Minimum 880 kPa (9.0 kgf/cm², 128 psi) &m dash;——
Maximum variation 200 kPa (2.0 kgf/cm², 28 psi) ———

**Engine Assembly (R18A1, R18A3 engines)**
Item	Measurement	Qualification	Standard or New	Service Limit
Compression	Pressure Check the engine with the starter cranking	Minimum	880 kPa (9.0 kgf/cm², 128 psi)	&m dash;——
Maximum variation	200 kPa (2.0 kgf/cm², 28 psi)	———

Cylinder Head (R18A1, R18A3 engines)
Item Measurement Qualification Standard or New Service Limit
Head Warpage ——— 0.08 mm (0.003 in.)
Height 114.95-115.05 mm (4.526-4.530 in.) ———
Camshaft End play 0.05-0.25 mm (0.002-0.010 in.) 0.4 mm (0.02 in.)
Camshaft-to-holder oil clearance 0.045-0.084 mm (0.0018-0.003 3 in.) 0.15 mm (0.006 in.)
Total runout 0.03 mm (0.001 in.) max. 0.04 mm (0.002 in.)
Cam lobe height Intake, primary 35.754 mm (1.4076 in.) ———
Intake,
secondary A 35.358 mm (1.3920 in.) ———
Intake,
secondary B 36.027 mm ( 1.4184 in.) ———
Exhaust 35.813 mm (1.4100 in.) ———
Valve Clearance (cold) Intake 0.20±0.02 mm (0.008±0.0008 in.) ———
Exhaust 0.25±0.02 mm (0.010±0.0008 in.) ———
Stem O.D. Intake 5.48-5.49 mm (0.2157-0.2161 in.) 5.45 mm (0.215 in.)
Exhaust 5.45-5.46 mm (0.2146-0.2150 in.) 5.42 mm (0.213 in.)
Stem-to-guide clearance Intake 0.02-0.05 mm (0.0008-0.0020 in.) 0.08 mm (0.003 in.)
Exhaust 0.05-0.08 mm (0.0020-0.0031 in.) 0.11 mm (0.004 in.)
Valve seat Width Intake 0.85-1.15 mm (0.033-0.045 in.) 1.6 mm (0.06 in.)
Exhaust 1.25-1.55 mm (0.049-0.061 in.) 2.0 mm (0.08 in.)
Stem installed height Intake 67.2-67.4 mm (2.646-2.654 in.) 67.7 mm (2.665 in.)
Exhaust 58.4-58.6 mm (2.299-2.307 in.) 58.9 mm (2.319 in.)
Valve spring Free length Intake 55.31 mm (2.178 in.) ———
Exhaust 56.97 mm (2.243 in.) ———
Valve guide I.D. Intake 5.51-5.53 mm (0.217-0.218 in.) 5.55 mm (0.219 in.)
Exhaust 5.51-5.53 mm (0.217-0.218 in.) 5.55 mm (0.219 in.)
Installed height Intake 18.25-18.75 mm (0.719-0.738 in.) ———
Exhaust 18.25-18.75 mm (0.719-0.738 in.) ———
Rocker arm Arm-to-shaft clearance Intake 0.019-0.050 mm (0.0007-0.0020 in.) 0.08 mm (0.0031 in.)&nb sp;
Exhaust 0.019-0.050 mm (0.0007-0.0020 in.) 0.08 mm (0.0031 in.)

**Cylinder Head (R18A1, R18A3 engines)**
Item	Measurement	Qualification	Standard or New	Service Limit
Head	Warpage		———	0.08 mm (0.003 in.)
Height		114.95-115.05 mm (4.526-4.530 in.)	———
Camshaft	End play		0.05-0.25 mm (0.002-0.010 in.)	0.4 mm (0.02 in.)
Camshaft-to-holder oil clearance		0.045-0.084 mm (0.0018-0.003 3 in.)	0.15 mm (0.006 in.)
Total runout		0.03 mm (0.001 in.) max.	0.04 mm (0.002 in.)
Cam lobe height	Intake, primary	35.754 mm (1.4076 in.)	———
Intake, secondary A	35.358 mm (1.3920 in.)	———
Intake, secondary B	36.027 mm ( 1.4184 in.)	———
Exhaust	35.813 mm (1.4100 in.)	———
Valve	Clearance (cold)	Intake	0.20±0.02 mm (0.008±0.0008 in.)	———
Exhaust	0.25±0.02 mm (0.010±0.0008 in.)	———
Stem O.D.	Intake	5.48-5.49 mm (0.2157-0.2161 in.)	5.45 mm (0.215 in.)
Exhaust	5.45-5.46 mm (0.2146-0.2150 in.)	5.42 mm (0.213 in.)
Stem-to-guide clearance	Intake	0.02-0.05 mm (0.0008-0.0020 in.)	0.08 mm (0.003 in.)
Exhaust	0.05-0.08 mm (0.0020-0.0031 in.)	0.11 mm (0.004 in.)
Valve seat	Width	Intake	0.85-1.15 mm (0.033-0.045 in.)	1.6 mm (0.06 in.)
Exhaust	1.25-1.55 mm (0.049-0.061 in.)	2.0 mm (0.08 in.)
Stem installed height	Intake	67.2-67.4 mm (2.646-2.654 in.)	67.7 mm (2.665 in.)
Exhaust	58.4-58.6 mm (2.299-2.307 in.)	58.9 mm (2.319 in.)
Valve spring	Free length	Intake	55.31 mm (2.178 in.)	———
Exhaust	56.97 mm (2.243 in.)	———
Valve guide	I.D.	Intake	5.51-5.53 mm (0.217-0.218 in.)	5.55 mm (0.219 in.)
Exhaust	5.51-5.53 mm (0.217-0.218 in.)	5.55 mm (0.219 in.)
Installed height	Intake	18.25-18.75 mm (0.719-0.738 in.)	———
Exhaust	18.25-18.75 mm (0.719-0.738 in.)	———
Rocker arm	Arm-to-shaft clearance	Intake	0.019-0.050 mm (0.0007-0.0020 in.)	0.08 mm (0.0031 in.)&nb sp;
Exhaust	0.019-0.050 mm (0.0007-0.0020 in.)	0.08 mm (0.0031 in.)

Engine Block (R18A1, R18A3 engines)
Item Measurement Qualification Standard or New Service Limit
Block Warpage of deck ; 0.07 mm (0.003 in.) max. 0.10 mm (0.004 in.)
Bore diameter 81.000-81.015 mm (3.1890-3.1896 in.) 81.070 mm (3.1917 in.)
Bore taper ——— 0.05 mm (0.002 in.)
Reboring limit ——— 0.25 mm (0.01 in.)
Piston Skirt O.D. at 14 mm (0.55 in.) from bottom of skirt 80.980-80.990 mm (3.1881-3.1886 in.) 80.98 mm (3.186 in.)
Clearance in cylinder 0.010-0.035 mm (0.0004-0.0014 in.) 0.05 mm (0.002 in.)
Ring groove width Top 1.23-1.24 mm (0.048-0.049 in.) 1.26 mm (0.050 in.)
Second 1.22-1.23 mm (0.047-0.048 in.) 1.25 mm (0.049 in.)
Oil 2.005-2.020 mm (0.0789-0.0795 in.) 2.05 mm (0.081 in.)
Piston ring Ring-to-groove clearance Top 0.045-0.070 mm (0.0018-0.0028 in.) 0.13 mm (0.005 in.)
Second 0.035-0.060 mm (0.0014-0.0024 in.) 0.13 mm (0.005 in.)
Ring end ga p Top 0.20-0.35 mm (0.008-0.014 in.) 0.60 mm (0.024 in.)
Second 0.40-0.55 mm (0.016-0.022 in.) 0.70 mm (0.028 in.)
Oil 0.20-0.70 mm (0.008-0.028 in.) 0.80 mm (0.031 in.)
Piston pin O.D. 19.960-19.964 mm (0.7858-0.7860 in.) 19.960 mm (0.7858 in.)
Pin-to-piston clearance -0.004 to +0.003 mm
(-0.00016 to +0.00012 in.) 0.006 mm (0.0002 in.)
Connecting rod Pin-to-rod clearance 0.005-0.015 mm (0.0002-0.0006 in.) 0.02 mm (0.0008 in.)
Small-end bore diameter 19.969-19.975 mm (0.7862-0.7864 in.) ———
Large-end bore dia meter 48.0 mm (1.89 in.) ———
End play installed on crankshaft 0.15-0.35 mm (0.006-0.014 in.) 0.45 mm (0.018 in.)
Crankshaft Main journal diameter 54.976-55.000 mm (2.1644-2.1654 in.) ———
Rod journal diameter 44.976-45.000 mm (1.7707-1.7716 in.) ———
Rod/main journal taper 0.005 mm (0.0002 in.) max. 0.010 mm (0.0004 in.)
Rod/main journal out-of-round 0.005 mm (0.0002 in.) max. 0.010 mm (0.0004 in.)
End play 0.10-0.35 mm (0.004-0.014 in.) 0.45 mm (0.018 in.)
Runout 0.03 mm (0.0012 in.) max. 0.04 mm (0.0016 in.)
Crankshaft
bearing Main bearing-to-journal oil clearance 0.018-0.034 mm (0.0007-0.0013 in.) 0.045 mm (0.0018 in.)
Rod bearing clearance 0.024-0.042 mm (0.0009-0.0017 in.) 0.055 mm (0.0022 in.)

**Engine Block (R18A1, R18A3 engines)**
Item	Measurement	Qualification	Standard or New	Service Limit
Block	Warpage of deck	;	0.07 mm (0.003 in.) max.	0.10 mm (0.004 in.)
Bore diameter		81.000-81.015 mm (3.1890-3.1896 in.)	81.070 mm (3.1917 in.)
Bore taper		———	0.05 mm (0.002 in.)
Reboring limit		———	0.25 mm (0.01 in.)
Piston	Skirt O.D. at 14 mm (0.55 in.) from bottom of skirt		80.980-80.990 mm (3.1881-3.1886 in.)	80.98 mm (3.186 in.)
Clearance in cylinder		0.010-0.035 mm (0.0004-0.0014 in.)	0.05 mm (0.002 in.)
Ring groove width	Top	1.23-1.24 mm (0.048-0.049 in.)	1.26 mm (0.050 in.)
Second	1.22-1.23 mm (0.047-0.048 in.)	1.25 mm (0.049 in.)
Oil	2.005-2.020 mm (0.0789-0.0795 in.)	2.05 mm (0.081 in.)
Piston ring	Ring-to-groove clearance	Top	0.045-0.070 mm (0.0018-0.0028 in.)	0.13 mm (0.005 in.)
Second	0.035-0.060 mm (0.0014-0.0024 in.)	0.13 mm (0.005 in.)
Ring end ga p	Top	0.20-0.35 mm (0.008-0.014 in.)	0.60 mm (0.024 in.)
Second	0.40-0.55 mm (0.016-0.022 in.)	0.70 mm (0.028 in.)
Oil	0.20-0.70 mm (0.008-0.028 in.)	0.80 mm (0.031 in.)
Piston pin	O.D.		19.960-19.964 mm (0.7858-0.7860 in.)	19.960 mm (0.7858 in.)
Pin-to-piston clearance		-0.004 to +0.003 mm (-0.00016 to +0.00012 in.)	0.006 mm (0.0002 in.)
Connecting rod	Pin-to-rod clearance		0.005-0.015 mm (0.0002-0.0006 in.)	0.02 mm (0.0008 in.)
Small-end bore diameter		19.969-19.975 mm (0.7862-0.7864 in.)	———
Large-end bore dia meter		48.0 mm (1.89 in.)	———
End play installed on crankshaft		0.15-0.35 mm (0.006-0.014 in.)	0.45 mm (0.018 in.)
Crankshaft	Main journal diameter		54.976-55.000 mm (2.1644-2.1654 in.)	———
Rod journal diameter		44.976-45.000 mm (1.7707-1.7716 in.)	———
Rod/main journal taper		0.005 mm (0.0002 in.) max.	0.010 mm (0.0004 in.)
Rod/main journal out-of-round		0.005 mm (0.0002 in.) max.	0.010 mm (0.0004 in.)
End play		0.10-0.35 mm (0.004-0.014 in.)	0.45 mm (0.018 in.)
Runout		0.03 mm (0.0012 in.) max.	0.04 mm (0.0016 in.)
Crankshaft bearing	Main bearing-to-journal oil clearance		0.018-0.034 mm (0.0007-0.0013 in.)	0.045 mm (0.0018 in.)
Rod bearing clearance		0.024-0.042 mm (0.0009-0.0017 in.)	0.055 mm (0.0022 in.)

Engine Lubrication (R18A1, R18A3 engines)
Item Measurement Qualification Standard or New Service Limit

Engine oil Capacity Engine overhaul 4.5 L (4.8 US qt, 4.0 Imp qt)
Oil change, including filter 3.7 L (3.9 US qt, 3.3 Imp qt)
Oil change, without filter 3.5 L (3.7 US qt, 3.1 Imp qt)
Oil pump Inner-to-outer rotor clearance 0.02-0.16 mm (0.001-0.006 in.) 0.20 mm (0.008 in.)
Pump housing-to-outer rotor clearance 0.100-0.175 mm (0.0039-0.0069 in.) 0.20 mm (0.008 in.)
Pump housing-to-outer rotor axial clearance 0.02-0.07 mm (0.001-0.003 in.) 0.12 mm (0.005 in.)
Oil pressure with oil temperature at 80 °C (176 °F) At idle 70 kPa (0.7 kgf/cm², 10 psi)
At 3,000 rpm (min^-1) 340 kPa (3.5 kgf/cm², 50 psi)

**Engine Lubrication (R18A1, R18A3 engines)**
Item	Measurement	Qualification	Standard or New	Service Limit
Engine oil	Capacity	Engine overhaul	4.5 L (4.8 US qt, 4.0 Imp qt)
Oil change, including filter	3.7 L (3.9 US qt, 3.3 Imp qt)
Oil change, without filter	3.5 L (3.7 US qt, 3.1 Imp qt)
Oil pump	Inner-to-outer rotor clearance		0.02-0.16 mm (0.001-0.006 in.)	0.20 mm (0.008 in.)
Pump housing-to-outer rotor clearance		0.100-0.175 mm (0.0039-0.0069 in.)	0.20 mm (0.008 in.)
Pump housing-to-outer rotor axial clearance		0.02-0.07 mm (0.001-0.003 in.)	0.12 mm (0.005 in.)
Oil pressure with oil temperature at 80 °C (176 °F)	At idle	70 kPa (0.7 kgf/cm², 10 psi)
At 3,000 rpm (min^-1)	340 kPa (3.5 kgf/cm², 50 psi)

Cooling (R18A1, R18A3 engines)
Item Measurement Qualification Standard or New
Radiator Coolant capacities (including engine, heater, hoses, and reservoir)
Use Honda Long Life Antifreeze/Coolant Type 2 M/T with heater: engine overhaul 6.5 L (1.72 US gal, 1.43 Imp gal)
M/T with heater: coolant change 5.2 L (1.37 US gal, 1.14 Imp gal)
M/T without heater: engine overhaul 5.9 L (1.56 US gal, 1.30 Imp gal)
M/T without heater: coolant change 4.6 L (1.22 US gal, 1.01 Imp gal)
A/T with heater: engine overhaul 7.1 L (1.88 US gal, 1.56 Imp gal)
A/T with heater: coolant change 5.5 L (1.45 US gal, 1.21 Imp gal)
A/T without heater: engine overhaul 6.4 L (1.69 US gal, 1.41 Imp gal)
A/T without heater: coolant change 4.9 L (1.29 US gal, 1.08 Imp gal)
Reservoir Coolant capacity 0.4 L (0.11 US gal, 0.09 Imp gal)
Radiator cap Opening pressure 93-123 kPa (0.95-1.25 kgf/cm², 14-18 psi)
Thermostat Opening temperature Begins to open 80-84 °C (176-183 °F)
Fully open 95 & deg;C (203 °F)
Valve lift at fully open 8.0 mm (0.31 in.)

**Cooling (R18A1, R18A3 engines)**
Item	Measurement	Qualification	Standard or New
Radiator	Coolant capacities (including engine, heater, hoses, and reservoir) Use Honda Long Life Antifreeze/Coolant Type 2	M/T with heater: engine overhaul	6.5 L (1.72 US gal, 1.43 Imp gal)
M/T with heater: coolant change	5.2 L (1.37 US gal, 1.14 Imp gal)
M/T without heater: engine overhaul	5.9 L (1.56 US gal, 1.30 Imp gal)
M/T without heater: coolant change	4.6 L (1.22 US gal, 1.01 Imp gal)
A/T with heater: engine overhaul	7.1 L (1.88 US gal, 1.56 Imp gal)
A/T with heater: coolant change	5.5 L (1.45 US gal, 1.21 Imp gal)
A/T without heater: engine overhaul	6.4 L (1.69 US gal, 1.41 Imp gal)
A/T without heater: coolant change	4.9 L (1.29 US gal, 1.08 Imp gal)
Reservoir	Coolant capacity		0.4 L (0.11 US gal, 0.09 Imp gal)
Radiator cap	Opening pressure		93-123 kPa (0.95-1.25 kgf/cm², 14-18 psi)
Thermostat	Opening temperature	Begins to open	80-84 °C (176-183 °F)
Fully open	95 & deg;C (203 °F)
Valve lift at fully open		8.0 mm (0.31 in.)

Clutch (R18A1, R18A3 engine models)
Item Measurement Qualification Standa rd or New Service Limit
Clutch pedal Height from floor 187 mm (7.36 in.) ———
Stroke 130-140 mm (5.12-5.51 in.) ———
Play 10-18 mm (0.39-0.71 in.) ———
Disengagement height from floor 91 mm (3.58 in.) min. ———
Flywheel Runout on clutch mating surface 0.05 mm (0.002 in.) max. 0.15 mm (0.006 in.)
Clutch disc Rivet head depth 1.2-1.7 mm (0.047-0.067 in.) 0.3 mm (0.01 in.)
Thickness 8.2-8.9 mm (0.32-0.35 in.) 6.0 mm (0.24 in.)
Pressure plate Warpage 0.08 mm (0.003 in.) max. 0.15 mm (0.006 in.)
Height of diaphragm spring fingers Measured with special tool and feeler gauge 0.6 mm (0.02 in.) max. 0.8 mm (0.03 in.)

Item	Measurement	Qualification	Standa rd or New	Service Limit
Clutch pedal	Height from floor		187 mm (7.36 in.)	———
	Stroke		130-140 mm (5.12-5.51 in.)	———
	Play		10-18 mm (0.39-0.71 in.)	———
	Disengagement height from floor		91 mm (3.58 in.) min.	———
Flywheel	Runout on clutch mating surface		0.05 mm (0.002 in.) max.	0.15 mm (0.006 in.)
Clutch disc	Rivet head depth		1.2-1.7 mm (0.047-0.067 in.)	0.3 mm (0.01 in.)
Clutch disc	Thickness		8.2-8.9 mm (0.32-0.35 in.)	6.0 mm (0.24 in.)
Pressure plate	Warpage		0.08 mm (0.003 in.) max.	0.15 mm (0.006 in.)
Pressure plate	Height of diaphragm spring fingers	Measured with special tool and feeler gauge	0.6 mm (0.02 in.) max.	0.8 mm (0.03 in.)