Komatsu 170-3 Series, Руководство по ремонту, Страница: 411 / 454

170-3 SERIES
15-5
REPAIR AND REPLACEMENT OF PARTS
Unit: mm
Inspection item Judgement standards Remedy
H. Abnormality in valve
• 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.
Replace
I. Outside diameter of
valve
• Outside diameter
Replace
J. Inside diameter of
valve guide
(after press fitted to
head)
Replace
K. Protrution of valve
guide
(after press fitted to
head)
L. Outside diameter of
crosshead guide
M. Protrution of crosshed
guide
Replace
Standard size Standard value Repair limit
Exhaust 12 11.893 – 11.908 11.80
Intake 12 11.920 – 11.940 11.90
Standard size Standard value Repair limit
12 11.981 – 11.999 12.10
Permissible range: 42.5 – 43.5
Standard size Standard value Repair limit
13 13.028 – 13.039 13.00
a: Cylinder head
Permissible range: 85.75 – 86.25
(7)
TESTING AND INSPECTING CYLINDER HEAD
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