VALVE GUIDE
SEM401E
Unit: mm (in)
Standard Service Limit
Intake Exhaust Intake Exhaust Ð
Length (L) 52.6 (2.071) 56.0 (2.205) 52.6 (2.071) 56.0 (2.205) Ð
Outer diameter (D)11.023 - 11.034
(0.4340 - 0.4344)12.023 - 12.034
(0.4733 - 0.4738)11.223 - 11.234
(0.4418 - 0.4423)12.223 - 12.234
(0.4812 - 0.4817)Ð
Inner diameter (d)
(Finished size)7.000 - 7.018
(0.2756 - 0.2763)8.000 - 8.018
(0.3150 - 0.3157)7.000 - 7.018
(0.2756 - 0.2763)8.000 - 8.018
(0.3150 - 0.3157)Ð
Cylinder head hole diameter10.975 - 10.996
(0.4321 - 0.4329)11.975 - 11.996
(0.4715 - 0.4723)11.175 - 11.196
(0.4400 - 0.4408)12.175 - 12.196
(0.4793 - 0.4802)Ð
Interference fit 0.027 - 0.059 (0.0011 - 0.0023) Ð
Stem to guide clearance0.020 - 0.053
(0.0008 - 0.0021)0.040 - 0.070
(0.0016 - 0.0028)0.020 - 0.053
(0.0008 - 0.0021)0.040 - 0.070
(0.0016 - 0.0028)0.1 (0.004)
Tapping length (,) 14.9 - 15.1 (0.587 - 0.594)
VALVE SEAT
SEM402E
Unit: mm (in)
Standard Service
Intake Exhaust Intake Exhaust
Cylinder head seat recess
diameter36.000 - 36.016
(1.4173 - 1.4179)42.000 - 42.016
(1.6535 - 1.6542)36.500 - 36.516
(1.4370 - 1.4376)42.500 - 42.516
(1.6732 - 1.6739)
Valve seat outer diameter
(D
1)36.080 - 36.096
(1.4205 - 1.4211)42.080 - 42.096
(1.6567 - 1.6573)36.580 - 36.596
(1.4402 - 1.4408)42.580 - 42.596
(1.6764 - 1.6770)
Face angle (a) 45É 45É 45É 45É
Contacting width (W) 1.6 - 1.7 (0.063 - 0.067) 1.7 - 2.1 (0.067 - 0.083) 1.6 - 1.7 (0.063 - 0.067) 1.7 - 2.1 (0.067 - 0.083)
SERVICE DATA AND SPECIFICATIONS (SDS)KA
Inspection and Adjustment (Cont'd)
EM-92
General Specifications
Engine model TD25
Cylinder arrangementIn-line
Number of cylinders 4
Valve arrangement OHV
Bore x stroke mm (in)92.9 x 92.0
(3.657 x 3.622)
Displacement cm
3(cu in) 2,494 (152.18)
Firing order 1-3-4-2
Number of
piston ringsCompression 2
Oil 1
Number of main bearings 5
Inspection and Adjustment
COMPRESSION PRESSURE
Unit: kPa (bar, kg/cm2, psi)/rpm
Standard 2,942 (29.4, 30, 427)/200
Minimum 2,452 (24.5, 25, 356)/200
Differential limit between cylinders 294 (2.9, 3, 43)/200
CYLINDER HEAD
Unit: mm (in)
Standard Limit
Head surface distortionLess than
0.07 (0.0028)0.2 (0.008)
Nominal cylinder head height 89.9 - 90.1 (3.539 - 3.547)
VALVE
Unit: mm (in)
SEM188
Engine TD25
Valve head diameter ``D''
Intake41.4 - 41.6
(1.630 - 1.638)
Exhaust36.9 - 37.1
(1.453 - 1.461)
Valve length ``L''
Intake
117 (4.61)
Exhaust
Valve stem diameter ``d''
Intake 7.962 - 7.977 (0.3135 - 0.3141)
Exhaust 7.945 - 7.960 (0.3128 - 0.3134)
Valve seat angle ``a''
Intake
45É - 45É30¢
Exhaust
Valve margin ``T'' limit 0.5 (0.020)
Valve stem end surface
grinding limit0.2 (0.008)
Valve clearance (Hot)
Intake
0.35 (0.0138)
Exhaust
SERVICE DATA AND SPECIFICATIONS (SDS)TD
EM-98
Valve seat
Unit: mm (in)
SEM258F
Intake
Outer diameter ``D
1'' 42.535 - 42.545 (1.6746 - 1.6750)
Inner diameter ``D
2'' 35.9 - 36.1 (1.413 - 1.421)
Diameter of seat ``D
3'' 40.5 (1.594)
Cylinder head valve seat diameter 42.500 - 42.515 (1.6732 - 1.6738)
Valve seat face angle ``f'' 89É - 90É
SEM953C
Exhaust
Outer diameter ``D
1''
Standard 38.535 - 38.545 (1.5171 - 1.5175)
0.2 (0.008) Oversize (Service) 38.735 - 38.745 (1.5250 - 1.5254)
0.4 (0.016) Oversize (Service) 38.935 - 38.945 (1.5329 - 1.5333)
Inner diameter ``D
2'' 31.4 - 32.1 (1.236 - 1.264)
Diameter of seat ``D
3'' 36.0 (1.417)
Cylinder head valve seat diameter
Standard 38.495 - 38.510 (1.5155 - 1.5161)
0.2 (0.008) Oversize 38.695 - 38.710 (1.5234 - 1.5240)
0.4 (0.016) Oversize 38.895 - 38.910 (1.5313 - 1.5319)
Valve seat face angle ``J'' 89É - 90É
SERVICE DATA AND SPECIFICATIONS (SDS)TD
Inspection and Adjustment (Cont'd)
EM-100
