Komatsu 170-3 Series Shop Manual page 390

REPAIR AND REPLACEMENT OF PARTS
Inspection item
H. Abnormality in valve
I. Outside diameter of
valve
J. Inside diameter of
valve guide
(after press fitted to
head)
K. Protrution of valve
guide
(after press fitted to
head)
L. Outside diameter of
crosshead guide
M. Protrution of crosshed
guide
170-3 SERIES
Judgement standards
• Check if head has become flat, check for cracks or dent of seat surface
• Airtightness test
• Check for play in cotter when new cotter is inserted in cotter groove.
• Check for eccentric wear or curvature of stem.
• Check for dent in stem end.
• Outside diameter
Standard size
Exhaust 12
Intake 12
Standard size
12
Standard size
13
TESTING AND INSPECTING CYLINDER HEAD
Standard value
11.893 – 11.908
11.920 – 11.940
Standard value
11.981 – 11.999
Permissible range: 42.5 – 43.5
Standard value
13.028 – 13.039
a: Cylinder head
Permissible range: 85.75 – 86.25
Remedy
Replace
Repair limit
Replace
11.80
11.90
Repair limit
12.10
Replace
Repair limit
13.00
Replace
Unit: mm
15-5
(7)