Komatsu 4D98 Series Shop Manual page 55

4. Engine Body
(5.3) Intake/exhaust valve
Mainly clean and check damage and
wear at the valve stem and seat.
(a) Seat contact: See 5.1 -(d) above.
(b) Stem outside diameter: See 5.2-a
above.
(c) Valve head thickness
(mm
Standard Limit
4TNE94*95
Intake
1.71
1 .oo
Exhaust 1.65
1 .oo
4TNE106 (T) Intake 2.00 1.30
Exhaust 2.00 1.30
(d) Valve stem bend
I Limit I 0.01 mm
I
(e) Overall length
Imm'
Standard Limit
4TNE94.98 Intake
l
115 114.5
Exhaust
4TNE106 (T) Intake
l
126 125.5
1 Exhaust
1
(5.4) Valve spring
Mainly inspect damage and corrosion.
!
1 4TNE106(T)
1
50.6
I I
l4
!
~
Thic*s*
Valve bend and length
Valve sprin-
Valve spring
4-7