Komatsu 4D98 Series Shop Manual page 54

4. Engine Body
(d) Seat contact
Apply a thin coat of minium on the
valve seat. insert the valve in the cyl-
inder and push it against the seat to
check seat contact.
Standard: Continuous contact
all around
(5.2) Valve guide
Mainly check damage and wear on the
inside wail. Apply supply part code
when replacing the part.
0 Inside diameter
imml
1 Standard
1
Limit
QTNE94.98
~ Intake Guide
I.D.
8.015-8.030
8.100
vahe
/
Stem O.D. 7.965-7.980
/
7.915
Clearance
Ex- Guide I.D.
haust Stem O.D.
value
Clearance
1TNE106 (T)
intake Guide I.D.
vaiue
Stem O.D.
Clearance
0.035-0.065 0.185
8.015-8.030 8.100
7.955-7.970 7.905
0.045-0.075 0.195
9.000-9.015 9.085
8.950-8.965 8.900
0.035-0.065 0.185
Valve
seat contact
AL
Seat
Y
Measuring positions
/
I\
a b
B t
t
Valve guide inside diameter
-
-1
Measuring positions
I l-n
I
t
Valve stem outside diameter
Ex- Guide I.D.
9.000-9.015 9.085
haust
Stem O.D.
8.940-8.955 8.890
Clearance
0.045-0.075 0.195
4-6