CYLINDER HEAD

Unit: mm (in)
Items
Standard
Limit
Head surface distortion

0.03 (0.0012)
Normal cylinder head height “H”
126.3 (4.97)


PBIC0924E.JPG

 
 VALVE DIMENSIONS

Unit: mm (in)

SEM188.JPG
Valve head diameter “D”
Intake
37.0 - 37.3 (1.457 - 1.469)
Exhaust
32.0 - 32.3 (1.260 - 1.272)
Valve length “L”
Intake
94.96 (3.7386)
Exhaust
91.96 (3.6205)
Valve stem diameter “d”
Intake
5.965 - 5.980 (0.2348 - 0.2354)
Exhaust
5.955 - 5.970 (0.2344 - 0.2350)
Valve seat angle “α”
Intake
45°15′ - 45°45′
Exhaust
Valve margin “T”
Intake
1.1 (0.043)
Exhaust
1.3 (0.051)
Valve margin “T” limit
0.5 (0.020)
Valve stem end surface grinding limit
0.2 (0.008)

 
 VALVE GUIDE

Unit: mm (in)

SEM950E.JPG
Items
Standard
Oversize (Service) [0.2 (0.008)]
Valve guide
Outer diameter
10.023 - 10.034 (0.3946 - 0.3950)
10.223 - 10.234 (0.4025 - 0.4029)
Inner diameter (Finished size)
6.000 - 6.018 (0.2362 - 0.2369)
Cylinder head valve guide hole diameter
9.975 - 9.996 (0.3927 - 0.3935)
10.175 - 10.196 (0.4006 - 0.4014)
Interference fit of valve guide
0.027 - 0.059 (0.0011 - 0.0023)
Items
Standard
Limit
Valve guide clearance
Intake
0.020 - 0.053 (0.0008 - 0.0021)
0.08 (0.0031)
Exhaust
0.030 - 0.063 (0.0012 - 0.0025)
0.09 (0.0035)
Projection length “L”
11.6 - 11.8 (0.457 - 0.465)

 
 VALVE SEAT

Unit: mm (in)

PBIC2745E.JPG
Items
Standard
Oversize (Service) [0.5 (0.020)]
Cylinder head seat recess diameter “D”
Intake
38.000 - 38.016 (1.4961 - 1.4967)
38.500 - 38.516 (1.5157 - 1.5164)
Exhaust
33.000 - 33.016 (1.2992 - 1.2998)
33.500 - 33.516 (1.3189 - 1.3195)
Valve seat outer diameter “d”
Intake
38.097 - 38.113 (1.4999 - 1.5005)
38.597 - 38.613 (1.5196 - 1.5202)
Exhaust
33.080 - 33.096 (1.3024 - 1.3030)
33.580 - 33.596 (1.3220 - 1.3227)
Valve seat interference fit
Intake
0.081 - 0.113 (0.0032 - 0.0044)
Exhaust
0.064 - 0.096 (0.0025 - 0.0038)
Diameter “d1”*1
Intake
31.1 - 31.6 (1.224 - 1.244)
Exhaust
29.52 (1.1622)
Diameter “d2”*2
Intake
36.3 - 36.8 (1.429 - 1.449)
Exhaust
35.0 (1.378)
Angle “α1”
Intake
60°
Exhaust
60°
Angle “α2”
Intake
88°45′ - 90°15′
Exhaust
88°45′ - 90°15′
Angle “α3”
Intake
110°
Exhaust
110°
Contacting width “W”*3
Intake
1.0 - 1.4 (0.039 - 0.055)
Exhaust
1.2 - 1.6 (0.047 - 0.063)
Height “h”
Intake
5.9 - 6.0 (0.232 - 0.236)
4.61 - 4.71 (0.1815 - 0.1854)
Exhaust
5.9 - 6.0 (0.232 - 0.236)
4.26 - 4.36 (0.1677 - 0.1717)
Depth “H”
6.0 (0.236)
*1: Diameter made by intersection point of conic angles “α1” and “α2”
*2: Diameter made by intersection point of conic angles “α2” and “α3”
*3: Machining data

 
 VALVE SPRING

Items
Standard
Intake
Exhaust
Free height
47.52 mm (1.8709 in)
53.81 mm (2.1185 in)
Installation height
37.00 mm (1.4567 in)
33.80 mm (1.3307 in)
Installation load
188 ‐ 208 N (19.2 ‐ 21.2 kg, 42 ‐ 47 lb)
301 ‐ 339 N (30.7 ‐ 34.6 kg, 68 ‐ 76 lb)
Height during valve open
27.80 mm (1.0945 in)
24.29 mm (0.9563 in)
Load with valve open
410 ‐ 453 N (41.8 ‐ 46.2 kg, 92 ‐ 102 lb)
487 ‐ 549 N (49.7 ‐ 56.0 kg, 109 ‐ 123 lb)


Items
Limit
Squareness
2.5 mm (0.098 in)