Komatsu 170-3 Series, Руководство по ремонту, Страница: 412 / 454

REPAIR AND REPLACEMENT OF PARTS
15-6
170-3 SERIES
(7)
REPAIRING MOUNTING FACE OF CYLINDER HEAD
BY GRINDING
1. Grinding
1) Remove the valve seat inserts. For details,
see REPLACING VAVLE SEAT INSERTS.
2) Remove the nozzle holder sleeves. For
details, see REPLACING NOZZLE HOLDER
SLEEVES.
3) Grind the cylinder head to remove the
strained or corroded portions within the limit
of the height of the cylinder head (H).
If any grinding is carried out, stamp the side
face of the cylinder head with an (R) mark.
a
Repair limit of cyinder head height (H):
150.65 mm
(Standard size:150.95 – 151.05 mm)
a
Amount to remove per grinding:
0.10 – 0.15 mm
a
Surface roughness of grinding surface:
Top surface: 12.5S
Under surface: 4S
a
Flatness (deformation): Max. 0.05 mm
a
Grinding limit: 0.3 mm
a
Difference in head height between 6 cyl-
inders: Max. 0.15 mm
4) Press-fit the one-size-larger inserts. For details,
see REPLACING VALVE SEAT INSERTS.
5) Press-fit the nozzle holder sleeves. For details,
s e e R E P L A C E N G N O Z Z L E H O L D E R
SLEEVES.
2. Check after grinding
•
Check the sinking of the valves and protrution of
the injector are within the standard values
a
Standard sinking of valves:
(sinking) 0.39 – (protrution) 0.21 mm
a
Allowable protrusion of injector:
3.7 – 4.3 mm
REPAIRING MOUNTING FACE OF CYLINDER HEAD
BY GRINDING
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