Komatsu 4D98 Series Shop Manual page 176

12. Service Standards
12.2 Engine Body
(1) Cylinder head
(1.1) Cylinder head
Inspection item
Combustion surface distortion mm
Standard
Limit
Max. 0.05 0.15
Reference
we
Valve sink mm 4TNE94.98 Intake
0.5 - 0.7 1 .o
Exhaust 0.6 - 0.8 1.1 4-5
4TNElO6 (T) intake 0.7 - 0.9 1.2
Exhaust 0.9 - 1.1 1.4
Valve seat Seat angle Deg. Intake
Exhaust
Seat correction angle Deg.
(1.2)
Intake/exhaust valve and guide
120
90 4-9
40,150
4TNE9498
+
4TNE106 (T)
Valve stem outside diameter mm 8.940 - 6.955
8.890
Clearance
mm 0.045 - 0.075 0.195
/
Valve guide projection from cylinder 1 4TNE94.98 ) 14.7-15-o
I- I
head
Valve guide driving-in method
mm
4TNElO6 (T)
13.2-13.5
Cold-fitted
4-10
(1.3) Valve spring
Inspection item Standard Limit
Reference
Daae
Free length
Inclination
mm
4TNE94.98
47.5
4TNElO6 (T) 50.6 4-7
mm
1.2
12-2