Engine Body; Cylinder Head - Yanmar 3JH4E Service Manual

13.2 Engine body

13.2.1 Cylinder head

(1) Cylinder head
Inspection item
Combustion surface distortion
Valve sink
Valve seat Seat angle
(2) Intake/exhaust valve and guide
Intake
3JH4E
4JH4E
Exhaust
Valve guide projection from cylinder head
Valve guide driving-in method
Intake
4JH4-TE
4JH4-HTE
Exhaust
Valve guide projection from cylinder head
Valve guide driving-in method
(3) Valve spring
Inspection item
3JH4E/ 4JH4E
Free length
4JH4-TE/ 4JH4-HTE
Inclination
mm
Intake
mm Exhaust
Intake
deg.
Exhaust
Inspection item
Guide inside diameter
Valve stem outside diameter
Clearance
Guide inside diameter
Valve stem outside diameter
Clearance
Guide inside diameter
Valve stem outside diameter
Clearance
Guide inside diameter
Valve stem outside diameter
Clearance
Standard
0.05 or less
0.30-0.50
120
90
Standard
8.010-8.025
7.955-7.975
0.035-0.070
8.015-8.030
7.955-7.970
0.045-0.075
14.7-15.0
Cold-fitted
6.000-6.015
5.960-5.975
0.025-0.055
6.000-6.015
5.945-5.960
0.040-0.070
8.2-8.5
Cold-fitted
Standard Limit
44.4 43.0
37.4 36.9
-
319
13. Service standards
Limit Reference page
0.15 5.2.1(1)
0.8 5.2.3(3)
-
5.2.1(3)
-
Reference
Limit
8.10
7.90
0.18
8.10
7.90
0.18
-
5.2.3(4)
-
6.1
5.90
0.16
6.1
5.90
0.18
-
5.2.3(4)
-
Reference page
5.2.4(1)
1.1
page
5.2.3
5.2.3
mm