Yanmar 3JH3E - 4. Table of Standard Measurements for Maintenance; 4-1 Cylinder head

Chapter 10 Disassembly and Reassembly
_4. __ T_a_b_l_e_o_f_S_t_an_d_a_r_d_M_e_a_su_r_e_m_e_n_t_s_fo_r_.M_a_in_t_e_n_a_nc_e _____________ 3,4JH3(B)(C)E
4. Table of Standard Measurements for Maintenance
4-1 Cylinder head
:---~---~---~~
m
Distortion ot combustion surface
Intake
Valve seat angle
Exhaust
Intake
Width of valve seat
Exhaust
Outer dia. of stem
Intake valve
Guide inner dia.
Oil clearance
Outer dia.
of stem
Exhaust valve
Guide inner dia.
Oil clearance
Amount
of valve guide spray
Amount of intake/
Intake valve
exhaust valve sinking
Exhaust
valve
Thickness of valve
Intake valve
umbrella
Exhaust valve
Intake valve timing
Open
b,T.O.C
Close
a.T.D.C
Exhaust valve timing Open
b,B.D.C
Close
a.T.D.C
Free length
Valve spring Distortion
Tensile strength/kg) (1mm under pressure}
Intake/Exhaust valve clearance
Printed in Japan
HJNSHl•H8009
10-35
3JH3(8)(C}E 4JH3(B}(C)E
Standard
Umit
0.05 or tess than
0.15
120·
... _
90'
-
1.07~1.24
1.74
1.24~1.45 1.94
7.960~7.975
7.9
8,010~8.025 8.1
0.035~0.065
0.2
7.955~7,970
7.9
8.015~8.030 8. 1
0.045~0.075
0.2
15
~-
0.306~0.506
1.0
0.3~0.5
1 .244~ 1.444
0.5
1.35~1.55
6~20·
10·~20'
4o·~so·
4s•~s8·
-
s1·~ao·
51•~61'
13°~23°
13'~2s·
44.4
~,
-
1.1
2.71 (Axonometric pitch)/ 3.61
~
0.15~0.25
~-
l
I