Page 1729 of 2267

VA LV E
Unit: mm (in)
SEM188
Valve head diameter ªDº
Intake 34.0 - 34.2 (1.339 - 1.346)
Exhaust 30.0 - 30.2 (1.181 - 1.189)
Valve length ªLº
Intake 98.17 - 98.63 (3.8650 - 3.8831)
Exhaust 99.09 - 99.55 (3.9012 - 3.9193)
Valve stem diameter ªdº
Intake 5.965 - 5.980 (0.2348 - 0.2354)
Exhaust 5.945 - 5.960 (0.2341 - 0.2346)
Valve seat angle ªaº
Intake
Exhaust45É15¢- 45É45¢
Valve margin ªTº
Intake 1.3 (0.051)
Exhaust 1.6 (0.063)
Valve margin ªTº limit More than 0.5 (0.020)
Valve stem end surface
grinding limitLess than 0.2 (0.008)
Valve clearance
Intake 0 (0)
Exhaust 0 (0)
Valve spring
Free height mm (in) 49.36 (1.9433)
Pressure
N (kg, lb) at height mm (in)
Standard569.00 - 641.57
(58.02 - 65.42, 127.93 - 144.25)
at 30.0 (1.181)
Limit549.2 (56.0, 123.5)
at 30.0 (1.181)
Out-of-square mm (in) Less than 2.2 (0.087)
Hydraulic lash adjuster (HLA)
Unit: mm (in)
HLA outer diameter16.980 - 16.993
(0.6685 - 0.6690)
HLA guide inner diameter17.000 - 17.020
(0.6693 - 0.6701)
Clearance between HLA and HLA guide0.007 - 0.040
(0.0003 - 0.0016)
Valve guide
Unit: mm (in)
NEM032
Standard Service
Valve guide
Outer
diameterIntake10.023 - 10.034
(0.3946 - 0.3950)10.223 - 10.234
(0.4025 - 0.4029)
Exhaust10.023 - 10.034
(0.3946 - 0.3950)10.223 - 10.234
(0.4025 - 0.4029)
Valve guide
Inner diam-
eter (Fin-
ished size)Intake6.000 - 6.018
(0.2362 - 0.2369)
Exhaust 6.000 - 6.018 (0.2362 - 0.2369)
Cylinder head
valve guide
hole diameterIntake9.975 - 9.996
(0.3927 - 0.3935)10.175 - 10.196
(0.4006 - 0.4014)
Exhaust9.975 - 9.996
(0.3927 - 0.3935)10.175 - 10.196
(0.4006 - 0.4014)
Interference fit of valve
guide0.027 - 0.059 (0.0011 - 0.0023)
Standard Limit
Stem to guide
clearanceIntake0.020 - 0.053
(0.0008 - 0.0021)0.08 (0.0031)
Exhaust0.040 - 0.073
(0.0016 - 0.0029)0.1 (0.004)
Valve deflection limit 0.2 (0.008)
Projection length ªLº 14.0 - 14.2 (0.551 - 0.559)
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-189
Page 1730 of 2267

Valve seat
SR20DE engine
Unit: mm (in)
NEM212
Standard Service
Cylinder head seat recess diameter (D)In. 35.000 - 35.016 (1.3780 - 1.3786) 35.500 - 35.516 (1.3976 - 1.3983)
Ex. 31.000 - 31.016 (1.2205 - 1.2211) 31.500 - 31.516 (1.2402 - 1.2408)
Valve seat interference fitIn. 0.064 - 0.096 (0.0025 - 0.0038)
Ex. 0.064 - 0.096 (0.0025 - 0.0038)
Valve seat outer diameter (d)In. 35.080 - 35.096 (1.3811 - 1.3817) 35.580 - 35.596 (1.4008 - 1.4014)
Ex. 31.080 - 31.096 (1.2236 - 1.2242) 31.580 - 31.596 (1.2433 - 1.2439)
Depth (H)In. 6.25 (0.2461)
Ex. 6.25 (0.2461)
Height (h)6.2 - 6.3 (0.244 - 0.248)
INTAKECylinder head
EXHAUST
Standard Standard
*29.35 - 29.65
(1.1555 - 1.1673)
*44É53¢- 45É07¢
*33.6 - 33.8
(1.323 - 1.331)
Contacting width (W): 1.385 - 1.401
(0.0545 - 0.0552)*44É53¢- 45É07¢
*29.4 -29.6 (1.157 - 1.165)
Contacting width (W): 1.385 - 1.401 (0.0545 - 0.0552)
Oversize
Oversize
*44É53¢- 45É07¢
*33.6 - 33.8
(1.323 - 1.331)
Contacting width (W): 1.385 - 1.401
(0.0545 - 0.0552)
:* Machining data*44É53¢- 45É07¢
*29.4 - 29.6 (1.157 - 1.165)
Contacting width (W): 1.385 - 1.401 (0.0545 - 0.0552)
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-190
Page 1731 of 2267
Valve clearance adjustment
Unit: mm (in)
Valve clearance
Intake 0 (0)
Exhaust 0 (0)
Valve clearance ªTº T
1 0.025 (0.001)
Available shim
Thickness mm (in) Identification mark
2.800 (0.1102)28
00
2.825 (0.1112)28
25
2.850 (0.1122)28
50
2.875 (0.1132)28
75
2.900 (0.1142)29
00
2.925 (0.1152)29
25
2.950 (0.1161)29
50
2.975 (0.1171)29
75
3.000 (0.1181)30
00
3.025 (0.1191)30
25
3.050 (0.1201)30
50
3.075 (0.1211)30
75
3.100 (0.1220)31
00
3.125 (0.1230)31
25
3.150 (0.1240)31
50
3.175 (0.1250)31
75
3.200 (0.1260)32
00
SEM095D Rocker arm
guide
ValveValve
SEM096D ShimIndicate
T=2.800 mm
(0.1102 in)
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-191
Page 1732 of 2267

CAMSHAFT AND CAMSHAFT BEARING
Unit: mm (in)
Standard Limit
Camshaft journal to
bearing clearance0.030 - 0.071
(0.0012 - 0.0028)0.15 (0.0059)
Inner diameter of
camshaft bearing28.000 - 28.021
(1.1024 - 1.1032)Ð
Outer diameter of
camshaft journal27.950 - 27.970
(1.1004 - 1.1012)Ð
Camshaft runout [TIR*]Less than
0.02 (0.0008)0.1 (0.004)
Camshaft sprocket
runout [TIR*]Less than
0.25 (0.0098)Ð
Camshaft end play0.055 - 0.139
(0.0022 - 0.0055)0.20 (0.0079)
EM671
SR20DE
Cam height ªAº
Intake 37.775 (1.4872)
Exhaust 37.404 (1.4726)
Cam wear limit 0.2 (0.008)
*Total indicator reading
CYLINDER BLOCK
Unit: mm (in)
SEM008D
SEM010D
211.25 - 211.35
(8.3169 - 8.3208)
100 (3.94)
60 (2.36)
10 (0.39)
Surface flatness
Standard Less than 0.03 (0.0012)
Limit 0.10 (0.0039)
Cylinder bore
Inner diameter
Standard
Grade No. 1 86.000 - 86.010 (3.3858 - 3.3862)
Grade No. 2 86.010 - 86.020 (3.3862 - 3.3866)
Grade No. 3 86.020 - 86.030 (3.3866 - 3.3870)
Wear limit 0.20 (0.0079)
Out-of-round (X þ Y) Less than 0.015 (0.0006)
Taper (AþBþC)Less than 0.010 (0.0004)
Difference in inner diam-
eter between cylinders
Limit Less than 0.05 (0.0020)
Main journal inner
diameter
Grade No. 0 58.944 - 58.950 (2.3206 - 2.3209)
Grade No. 1 58.950 - 58.956 (2.3209 - 2.3211)
Grade No. 2 58.956 - 58.962 (2.3211 - 2.3213)
Grade No. 3 58.962 - 58.968 (2.3213 - 2.3216)
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-192
Page 1733 of 2267

PISTON, PISTON RING AND PISTON PIN
Available piston
Unit: mm (in)
SEM750C
Piston skirt diameter ªAº
Standard
Grade No. 1 85.980 - 85.990 (3.3850 - 3.3854)
Grade No. 2 85.990 - 86.000 (3.3854 - 3.3858)
Grade No. 3 86.000 - 86.010 (3.3858 - 3.3862)
0.20 (0.0079)
oversize (Service)86.180 - 86.210 (3.3929 - 3.3941)
ªaº dimension 13.1 (0.5157)
Piston clearance to cylinder
block0.010 - 0.030 (0.0004 - 0.0012)
Piston pin hole diameter 21.993 - 22.005 (0.8659 - 0.8663)
Piston ring
Unit: mm (in)
Side clearance
To p
Standard 0.045 - 0.080 (0.0018 - 0.0031)
Limit 0.2 (0.008)
2nd
Standard 0.030 - 0.070 (0.0012 - 0.0028)
Limit 0.2 (0.008)
Oil ring 0.065 - 0.135 (0.0026 - 0.0053)
Ring gap
To p
Standard 0.20 - 0.30 (0.0079 - 0.0118)
Limit 1.0 (0.039)
2nd
Standard 0.35 - 0.50 (0.0138 - 0.0197)
Limit 1.0 (0.039)
Oil
Standard 0.20 - 0.60 (0.0079 - 0.0236)
Limit 1.0 (0.039)
Piston pin
Unit: mm (in)
Piston pin outer diameter 21.989 - 22.001 (0.8657 - 0.8662)
Interference fit of piston pin
to piston0.002 - 0.006 (0.0001 - 0.0002)
Piston pin to connecting rod
bushing clearance
Standard 0.005 - 0.017 (0.0002 - 0.0007)
Limit 0.023 (0.0009)
* Values measured at ambient temperature of 20ÉC (68ÉF)
CONNECTING ROD
Unit: mm (in)
Center distance 136.30 (5.3661)
Bend, torsion [per 100 (3.94)]
Limit 0.15 (0.0059)
Torsion [per 100 (3.94)]
Limit 0.3 (0.0012)
Connecting rod small end
inner diameter24.980 - 25.000 (0.9835 - 0.9843)
Piston pin bushing inner
diameter*22.000 - 22.012 (0.8661 - 0.8666)
Connecting rod big end inner
diameter51.000 - 51.013 (2.0079 - 2.0084)
Side clearance
Standard 0.20 - 0.35 (0.0079 - 0.0138)
Limit 0.5 (0.020)
* After installing in connecting rod
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-193
Page 1734 of 2267

CRANKSHAFT
Unit: mm (in)
Main journal dia. ªDmº
Grade No. 0 54.974 - 54.980 (2.1643 - 2.1646)
Grade No. 1 54.968 - 54.974 (2.1641 - 2.1643)
Grade No. 2 54.962 - 54.968 (2.1639 - 2.1641)
Grade No. 3 54.956 - 54.962 (2.1636 - 2.1639)
Pin journal dia. ªDpº
Grade No. 0 47.968 - 47.974 (1.8885 - 1.8887)
Grade No. 1 47.962 - 47.968 (1.8883 - 1.8885)
Grade No. 2 47.956 - 47.962 (1.8880 - 1.8883)
Center distance ªrº 42.96 - 43.04 (1.6913 - 1.6945)
Out-of-round (X þ Y)
StandardPin journal: Less than 0.0025 (0.0001)
Main journal: Less than 0.005 (0.0002)
Taper (A þ B)
StandardPin journal: Less than 0.0025 (0.0001)
Main journal: Less than 0.005 (0.0002)
Runout [TIR]
Standard Less than 0.025 (0.0010)
Limit Less than 0.05 (0.0020)
Free end play
Standard 0.10 - 0.26 (0.0039 - 0.0102)
Limit 0.30 (0.0118)
SEM954C
EM715 Out-of-round X - Y
Taper A - B
AB
Y
X
AVAILABLE MAIN BEARING
SEM021D
Main bearing (Standard)
Unit: mm (in)
Grade
numberThickness ªTº Width ªWºIdentification
color (mark)
01.977 - 1.980
(0.0778 - 0.0780)
18.9 - 19.1
(0.744 - 0.752)Black (A)
11.980 - 1.983
(0.0780 - 0.0781)Red (B)
21.983 - 1.986
(0.0781 - 0.0782)Green (C)
31.986 - 1.989
(0.0782 - 0.0783)Yellow (D)
41.989 - 1.992
(0.0783 - 0.0784)Blue (E)
51.992 - 1.995
(0.0784 - 0.0785)Pink (F)
61.995 - 1.998
(0.0785 - 0.0787)White (G)
Main bearing (Undersize)
Unit: mm (in)
Undersize Thickness ªTºMain journal
diameter ªDmº
0.25 (0.0098)2.109 - 2.117
(0.0830 - 0.0833)Grind so that bearing
clearance is the
specified value.
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-194
Page 1735 of 2267

AVAILABLE CONNECTING ROD BEARING
Connecting rod bearing
Standard size
Unit: mm (in)
Grade
numberThickness ªTº Width ªWºIdentification
color (mark)
01.500 - 1.503
(0.0591 - 0.0592)
16.9 - 17.1
(0.665 - 0.673)Black or Yellow
11.503 - 1.506
(0.0592 - 0.0593)Brown or Red
21.506 - 1.509
(0.0593 - 0.0594)Green or Blue
Undersize
Unit: mm (in)
Undersize Thickness ªTºCrank pin journal
diameter ªDpº
0.08 (0.0031)1.541 - 1.549
(0.0607 - 0.0610)
Grind so that bearing
clearance is the
specified value. 0.12 (0.0047)1.561 - 1.569
(0.0615 - 0.0618)
0.25 (0.0098)1.626 - 1.634
(0.0640 - 0.0643)
Bearing clearance
Unit: mm (in)
Main bearing clearance
Standard 0.004 - 0.022 (0.0002 - 0.0009)
Limit 0.05 (0.0020)
Connecting rod bearing clearance
Standard 0.020 - 0.045 (0.0008 - 0.0018)
Limit 0.065 (0.00256)
MISCELLANEOUS COMPONENTS
Unit: mm (in)
Camshaft sprocket runout limit [TIR] 0.25 (0.0098)
Flywheel runout limit [TIR] 0.15 (0.0059)
Drive plate runout limit [TIR] 0.2 (0.008)
SERVICE DATA AND SPECIFICATIONS (SDS)SR20DE
Inspection and Adjustment (Cont'd)
EM-195
Page 1736 of 2267

General Specifications
Cylinder arrangement In-line 4
Displacement cm
3(cu in) 1,974 (120.45)
Bore and stroke mm (in) 84.5´88.0 (3.329´3.465)
Valve arrangement OHC
Firing order 1-3-4-2
Number of piston rings
Compression 2
Oil 1
Number of main bearing 5
Compression ratio 22.2
Valve timing
EM120
Unit: degree
abcde f
248É 232É 14É 38É 12É 56É
Inspection and Adjustment
COMPRESSION PRESSURE
Unit: kPa (bar, kg/cm2, psi) at 200 rpm
Standard 3,138 (31.4, 32, 455)
Limit 2,452 (24.5, 25, 356)
Difference limit
between cylinders490 (4.9, 5, 71)
CYLINDER HEAD
Unit: mm (in)
Head surface flatness
Standard Less than 0.03 (0.0012)
Limit 0.1 (0.004)
Nominal cylinder head
height137.9 - 138.1
(5.429 - 5.437)
CAMSHAFT AND CAMSHAFT BEARING
Unit: mm (in)
Standard Max. tolerance
Camshaft journal
clearance0.045 - 0.086
(0.0018 - 0.0034)0.1 (0.004)
Inner diameter of
camshaft bearing30.000 - 30.021
(1.1811 - 1.1819)Ð
Outer diameter of
camshaft journal29.935 - 29.955
(1.1785 - 1.1793)Ð
Camshaft runoutLess than
0.02 (0.0008)0.05 (0.0020)
Camshaft end play0.115 - 0.188
(0.0045 - 0.0074)Ð
EM671
Cam height ªAº
Intake 48.70 - 48.75 (1.9173 - 1.9193)
Exhaust 49.15 - 49.20 (1.9350 - 1.9370)
SERVICE DATA AND SPECIFICATIONS (SDS)CD20T
General Specifications
EM-196