Kia Optima: Specifications
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Description |
Specifications |
Limit |
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General |
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Type |
In-line, DOHC |
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Number of cylinders |
4 |
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Bore |
86mm (3.385in.) |
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Stroke |
86mm (3.385in.) |
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Total displacement |
1998cc (121.92cu.in) |
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Compression ratio |
9.5 ± 0.3 : 1 |
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Firing order |
1-3-4-2 |
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Valve timing |
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Intake valve |
Opens |
ATDC 7° ~ BTDC 38° |
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Closes |
ABDC 67° ~ ABDC22° |
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Exhaust valve |
Opens |
BBDC 54° ~ BBDC 9° |
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Closes |
BTDC 10° ~ ATDC35° |
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Valve clearance [Engine coolant temperature : 20°C (68°F)] |
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Intake valve |
0.17 ~ 0.23mm (0.0067 ~ 0.0090in.) |
0.10 ~ 0.30mm (0.0039 ~ 0.0118in.) |
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Exhaust valve |
0.32 ~ 0.38mm (0.0126 ~ 0.0150 in.) |
0.20 ~ 0.40mm (0.0079 ~ 0.0157in.) |
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Camshaft |
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Cam height |
Intake |
44.2mm (1.7401in.) |
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Exhaust |
45.0mm (1.7716in.) |
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Journal outer diameter |
Intake |
No.1 : ￠ 30mm (1.1811in.) No.2,3,4,5 : ￠ 24mm (0.9449in.) |
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Exhaust |
No.1 : ￠ 36mm (1.4173in.) No.2,3,4,5 : ￠ 24mm (0.9449in.) |
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Bearing oil clearance |
Intake |
No.1 : 0.022 ~ 0.057mm (0.00087 ~ 0.00224in.) No.2,3,4,5 : 0.030~0.067mm (0.00118 ~ 0.00264 in.) |
No.1 : 0.090mm (0.00354in.) No.2,3,4,5 : 0.120mm (0.00472in.) |
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Exhaust |
No.1 : 0 ~ 0.032mm (0 ~ 0.00126in.) No.2,3,4,5 : 0.030~0.067mm (0.00118 ~ 0.00264 in.) |
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End play |
0.04 ~ 0.16mm (0.0016 ~ 0.0063in.) |
0.20mm (0.0078in.) |
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Valve |
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Valve length |
Intake |
113.18mm (4.4559in.) |
112.93mm (4.4461in) |
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Exhaust |
105.79mm (4.1650in.) |
105.59mm (4.1571in) |
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Stem outer diameter |
Intake |
5.465 ~ 5.480mm (0.21516 ~ 0.21575in.) |
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Exhaust |
5.458 ~ 5.470mm (0.21488 ~ 0.21535in.) |
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Face angle |
45.25° ~ 45.75° |
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Thickness of valve head (margin) |
Intake |
1.02mm (0.0401in.) |
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Exhaust |
1.09mm (0.0429in.) |
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Valve stem to valve guide clearance |
Intake |
0.020 ~ 0.047mm (0.00078 ~ 0.00185in.) |
0.070mm (0.00275in.) |
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Exhaust |
0.030 ~ 0.054mm (0.00118 ~ 0.00212in.) |
0.090mm (0.00354in.) |
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MLA outer diameter |
31.964 ~ 31.980mm (1.2584 ~ 1.2590in.) |
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Tappet bore inner diameter |
32.000 ~ 32.025mm (1.2598 ~ 1.2608in.) |
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MLA to tappet bore clearance |
0.020 ~ 0.061mm (0.00078 ~ 0.00240in.) |
0.070mm (0.00275in.) |
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Valve guide |
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Length |
Intake |
43.8 ~ 44.2mm (1.7244 ~ 1.7401in.) |
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Exhaust |
43.8 ~ 44.2mm (1.7244 ~ 1.7401in.) |
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Inner diameter |
Intake |
5.500 ~ 5.512mm (0.21654 ~ 0.21701in.) |
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Exhaust |
5.500 ~ 5.512mm (0.21654 ~ 0.21701in.) |
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Valve seat |
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Width of seat contact |
Intake |
1.16 ~ 1.46mm (0.0457 ~ 0.0575in.) |
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Exhaust |
1.35 ~ 1.65mm (0.0531 ~ 0.0649in.) |
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Seat angle |
Intake |
44.75° ~ 45.10° |
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Exhaust |
44.75° ~ 45.10° |
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Valve spring |
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Free length |
47.44mm (1.8677in.) |
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Load |
19.0 ± 0.6kg/35.0mm (41.88 ± 1.32lb/1.3779in 39.8 ± 1.2kg/26.0mm (87.74 ± 2.64lb/1.0236in.) |
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Out of squareness |
Less than 1.5° |
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Cylinder head |
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Flatness of gasket surface |
Less than 0.05mm (0.0019in.) for total area Less than 0.02mm (0.0007in.) for a section of 100mm (3.9370in.)×100mm (3.9370in.) |
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Flatness of manifold mounting surface |
Intake |
Less than 0.10mm (0.0039in.) |
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Exhaust |
Less than 0.10mm (0.0039in.) |
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Piston |
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Piston outer diameter |
85.970 ~ 86.000mm (3.3846 ~ 3.3858 in) |
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Piston to cylinder clearance |
0.020 ~ 0.040mm (0.00079 ~ 0.00157in.) |
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Ring groove width |
No. 1 ring |
1.235 ~ 1.250mm (0.04862 ~ 0.04921in.) |
1.260mm (0.04961in.) |
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No. 2 ring |
1.530 ~ 1.550mm (0.06023 ~ 0.06102 in) |
1.560mm (0.06141in) |
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Oil ring |
2.010 ~ 2.025mm (0.07913 ~ 0.07972in.) |
2.050mm (0.08071in.) |
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Piston ring |
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Side clearance |
No. 1 ring |
0.050 ~ 0.080mm (0.00197 ~ 0.00315in.) |
0.100mm (0.00394in.) |
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No. 2 ring |
0.040 ~ 0.080mm (0.00157 ~ 0.00315in.) |
0.100mm (0.00394in.) |
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Oil ring |
0.020 ~ 0.055mm (0.00079 ~ 0.00217in.) |
0.100mm (0.00394in.) |
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End gap |
No. 1 ring |
0.15 ~ 0.30mm (0.0059 ~ 0.0118in.) |
0.60mm (0.0236in.) |
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No. 2 ring |
0.30 ~ 0.45mm (0.0118 ~ 0.0177 in) |
0.70mm (0.0275in.) |
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Oil ring |
0.20 ~ 0.50mm (0.0079 ~ 0.0197in.) |
0.80mm (0.0315in.) |
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Piston pin |
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Piston pin outer diameter |
21.997 ~ 22.000mm (0.86602 ~ 0.86614in.) |
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Piston pin hole inner diameter |
22.003 ~ 22.007mm (0.86626 ~ 0.86642in.) |
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Piston pin hole clearance |
0.003 ~ 0.010mm (0.00012 ~ 0.00039in.) |
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Connecting rod small end hole inner diameter |
22.005 ~ 22.011mm (0.86634 ~ 0.86657in.) |
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Piston pin-to-connecting rod interference |
0.005 ~ 0.014mm (0.00020 ~ 0.00055in.) |
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Connecting rod |
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Connecting rod big end inner diameter |
51.000 ~ 51.018mm (2.00787 ~ 2.00858in.) |
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Connecting rod bearing oil clearance |
0.031 ~ 0.045mm (0.00122 ~ 0.00177in.) |
0.050mm ( 0.00197in.) |
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Side clearance |
0.10 ~ 0.25mm (0.0039 ~ 0.0098in.) |
0.35mm (0.0138in.) |
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Crankshaft |
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Main journal outer diameter |
51.942 ~ 51.960mm (2.04496 ~ 2.04567in.) |
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Pin journal outer diameter |
47.954 ~ 47.972mm (1.88795 ~ 1.88866in.) |
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Main bearing oil clearance |
0.020 ~ 0.038mm (0.00079 ~ 0.00150in.) |
0.100mm (0.00394in.) |
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End play |
0.07 ~ 0.25mm (0.0028 ~ 0.0098in.) |
0.30mm (0.0118in.) |
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Cylinder block |
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Cylinder bore |
86.00 ~ 86.03mm (3.3858 ~ 3.3870in.) |
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Flatness of gasket surface |
Less than 0.05mm (0.0019in.) for total area Less than 0.02mm (0.0007in.) for a section of 100mm (3.9370in.)×100mm (3.9370in.) |
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Engine oil |
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Oil quantity |
Total |
5.5 L (1.45 U.S.gal., 5.81 U.S.qt., 4.84 lmp.qt.) |
When replacing a short engine or block assembly |
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Oil pan |
4.2 L (1.11 U.S.gal., 4.44 U.S.qt., 3.70 lmp.qt.) |
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Drain and refill |
4.6 L (1.22 U.S.gal., 4.86 U.S.qt., 4.05 lmp.qt.) |
Including oil filter |
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Oil grade |
Recommendation |
5W-30 ACEA A5 |
If not abailable, refer to the recommended API or ILSAC or ACEA clasification
and SAE viscosity number |
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Classification |
API SL, SM or above ILSAC GF3, GF4 or above ACEA A3 or A5 |
Satisfy the requirement of the API or ILSAC or ACEA clasification |
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SAE viscosity grade |
Recommended SAE viscosity number |
Refer to the "Lubrication System". |
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Oil pressure (at 1,000rpm) |
117.68kPa (1.2kgf/cm², 17.07psi) or above |
Oil temperature (oil pan): 110±2°C (230±35.6°F) |
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Cooling system |
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Cooling method |
Forced circulation with cooling fan |
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Coolant quantity |
6.5 ~ 6.6L (1.72 ~ 1.74 U.S.gal., 6.87 ~ 6.97 U.S.qt., 5.72 ~ 5.81 lmp.qt.
) |
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Thermostat |
Type |
Wax pellet type |
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Opening temperature |
82±1.5°C (179.6±2.7°F) |
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Full opening valve lift/temperature |
More than 8mm (0.3in.) / 95°C (203°F) |
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Radiator cap |
Main valve opening pressure |
93.16 ~ 122.58kPa (0.95 ~ 1.25kgf/cm², 13.51 ~ 17.78psi) |
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Vacuum valve opening pressure |
0 ~ 6.86 kPa (0 ~ 0.07kgf/cm², 0 ~ 0.99psi) |
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Tightening Torques
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Item |
Quantity |
N.m |
kgf.m |
lb-ft |
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Engine mounting |
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Engine mounting bracket to body fixing bolt |
4 |
58.8 ~ 73.5 |
6.0 ~ 7.5 |
43.4 ~ 54.2 |
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Engine mounting insulator to engine mounting support bracket fixing nut |
1 |
78.5 ~ 98.1 |
8.0 ~ 10.0 |
57.9 ~ 72.3 |
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Engine mounting support bracket to engine support bracket fixing bolt |
1 |
78.5 ~ 98.1 |
8.0 ~ 10.0 |
57.9 ~ 72.3 |
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Engine mounting support bracket to engine support bracket fixing nut |
2 |
78.5 ~ 98.1 |
8.0 ~ 10.0 |
57.9 ~ 72.3 |
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Transaxle mounting bracket to body fixing bolt |
3 |
49.0 ~ 63.7 |
5.0 ~ 6.5 |
36.2 ~ 47.0 |
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Transaxle mounting bracket to body fixing nut |
1 |
49.0 ~ 63.7 |
5.0 ~ 6.5 |
36.2 ~ 47.0 |
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Transaxle mounting support bracket fixing bolt |
4 |
58.8 ~ 78.5 |
6.0 ~ 8.0 |
43.4 ~ 57.9 |
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Transaxle mounting bracket to transaxle mounting support bracket fixing
bolt |
2 |
88.3 ~ 107.9 |
9.0 ~ 11.0 |
65.1 ~ 79.6 |
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Roll rod bracket to sub frame fixing bolt |
2 |
49.0 ~ 63.7 |
5.0 ~ 6.5 |
36.2 ~ 47.0 |
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Roll rod bracket to roll rod support bracket fixing bolt & nut |
1 |
88.3 ~ 107.9 |
9.0 ~ 11.0 |
65.1 ~ 79.6 |
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Timing system |
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Idler bolt |
2 |
53.9 ~ 63.7 |
5.5 ~ 6.5 |
39.7 ~ 47.0 |
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Drive belt tensioner pulley bolt |
1 |
53.9 ~ 63.7 |
5.5 ~ 6.5 |
39.7 ~ 47.0 |
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Drive belt tensioner bolt |
1 |
53.9 ~ 63.7 |
5.5 ~ 6.5 |
39.7 ~ 47.0 |
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Crankshaft pulley bolt |
1 |
166.6 ~ 176.4 |
17.0 ~ 18.0 |
122.9 ~ 130.1 |
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Timing chain cover service hole bolt |
1 |
11.8 ~ 14.7 |
1.2 ~ 1.5 |
8.7 ~ 10.8 |
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Timing chain cover bolt (M6×25) |
7 |
7.8 ~ 9.8 |
0.8 ~ 1.0 |
5.8 ~ 7.2 |
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Timing chain cover bolt (M8×28) |
7 |
18.6 ~ 22.5 |
1.9 ~ 2.3 |
13.7 ~ 16.6 |
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Engine support bracket bolt (M8×30) |
1 |
19.6 ~ 24.5 |
2.0 ~ 2.5 |
14.5 ~ 18.1 |
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Engine support bracket bolt (M10×40) |
1 |
39.2 ~ 44.1 |
4.0 ~ 4.5 |
28.9 ~ 32.5 |
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Engine support bracket bolt (M10×45) |
2 |
39.2 ~ 44.1 |
4.0 ~ 4.5 |
28.9 ~ 32.5 |
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Timing chain tensioner bolt |
2 |
9.8 ~ 11.8 |
1.0 ~ 1.2 |
7.2 ~ 8.7 |
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Timing chain tensioner arm bolt |
1 |
9.8 ~ 11.8 |
1.0 ~ 1.2 |
7.2 ~ 8.7 |
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Timing chain guide bolt |
3 |
9.8 ~ 11.8 |
1.0 ~ 1.2 |
7.2 ~ 8.7 |
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Timing chain oil jet bolt |
1 |
7.8 ~ 9.8 |
0.8 ~ 1.0 |
5.8 ~ 7.2 |
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Cylinder head |
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Engine cover mounting bolt |
4 |
9.8 ~ 11.8 |
1.0 ~ 1.2 |
7.2 ~ 8.7 |
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Ignition coil bolt |
4 |
3.9 ~ 5.9 |
0.4 ~ 0.6 |
2.9 ~ 4.3 |
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Cylinder head cover bolt |
20 |
[3.9~5.9] + [7.8~9.8] |
[0.4~0.6] + [0.8~1.0] |
[2.9~4.3] + [5.8~7.2] |
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Repair procedures
If the there is lack of power, excessive oil consumption or poor fuel economy,
measure the compression pressure.
1.
W ...
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...
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