Komatsu 170-3 Series, Shop Manual, Page: 415 / 454

170-3 SERIES
15-9
REPAIR AND REPLACEMENT OF PARTS
2. Machining valve seat insert mounting hole to
oversize
1) Using valve seat cutter A2, machine the
mounting hole to install a one-size-larger
insert
•
Dimensions of insert and mounting hole
a: Bottom surface of cylinder head
R: 0.6 mm
• Intake valve side Unit: mm
• Exhaust valve side Unit: mm
a
Inside diameter surface roughness:
Max. 12.5S
a
Mounting hole bottom roughness:Max. 12.5S
a
Concentricity of inside diameter of valve
guide and inside diameter of insert hole:
0.07 mm (T.l.R) max.
a
Rectangularity of inside diameter of valve
guide and bottom of insert hole:
Max. 0.03 mm (T.l.R)
Stamp
on
insert
Insert
Mounting hole for
insert
O.D.(d1)
Hight
(h1)
I.D. (d2)
Depth
(h2)
S.T.D. 64.00 8.5 64.00 11.4±0.1
0.25 O.S 64.25 8.5 64.25 11.4±0.1
0.50 O.S 64.50 8.62 64.50 11.52±0.1
0.75 O.S 64.75 8.75 64.75 11.65±0.1
1.00 O.S 65.00 8.88 65.00 11.78±0.1
Stamp
on
insert
Insert
Mounting hole for
insert
O.D.(d1)
Hight
(h1)
I.D. (d2)
Depth
(h2)
S.T.D. 63.60 9.7 63.60 12.3±0.1
0.25 O.S 63.85 9.7 63.85 12.3±0.1
0.50 O.S 64.10 9.82 64.10 12.42±0.1
0.75 O.S 64.35 9.95 64.35 12.55±0.1
1.00 O.S 64.60 10.08 64.60 12.68±0.1
0
- 0.1
+ 0.105
+ 0.080 + 0.1
0
+ 0.019
0
+ 0.105
+ 0.080
+ 0.1
0
+ 0.019
0
+ 0.105
+ 0.080 + 0.1
0
+ 0.019
0
+ 0.105
+ 0.080 + 0.1
0
+ 0.019
0
+ 0.105
+ 0.080 + 0.1
0
+ 0.019
0
+ 0.100
+0.080
+ 0.1
0
+ 0.019
0
+ 0.100
+0.080 + 0.1
0
+ 0.019
0
+ 0.100
+0.080
+ 0.1
0
+ 0.019
0
+ 0.100
+0.080 + 0.1
0
+ 0.019
0
+ 0.100
+0.080 + 0.1
0
+ 0.019
0
(7)
REPLACING VALVE SEAT INSERTS
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