Komatsu 170-3 Series, Руководство по ремонту, Страница: 425 / 454

170-3 SERIES
15-19
REPAIR AND REPLACEMENT OF PARTS
GRINDING THE TOP SURFACE OF CYLINDER BLOCK
Grinding
Grind off the strained and corroded portions of the
cylinder block within the allowable height (H) of the
cylinder block.
a
Use the following as a guide to decide when
to grind to the top surface.
If the top surface of the cylinder block is worn
or corroded in the shape of the head gasket,
and the amonut of wear a is more than 0.10
mm, grind the top surface.
a
If there are blackened portions on the cylin-
der liner contact surface of the counterbore b
(particularly in the front-to-rear direction), or
there is speckled wear, and these portions
extend over more than half of the contact
width of the deck, and if grinding has been
carried out on th top surface, correct the
counterbore.
1. Grinding top surface
1) Measure the wear and strain of the tops sur-
face of the cylinder block, and if it is not
within the repair limit, grind the top surface.
Flatness of cylinder block:
Standard dimension: 0.05 mm
Repair limit: 0.10 mm (for one cylinder)
Height of cylinder block (H):
Standard dimension:
488.96 – 489.04 mm
Repair limit: 488.56 mm
Roughness of top surface of cylinder block:
Max. 12.5S
If grinding with a grindstone (for reference)
a
Speed of grindstkone: 1,650 – 1,950
m/min.
a
Speed of table: 15 – 30 m/min.
a
Grinding depth/time: 0.025 mm
a
Cross feed/time: 1 – 2 mm
a
Grindstone: A461V
a
Grinding lubricant: Water-soluble
grind-ing lubricant
(7)
GRINDING THE TOP SURFACE OF CYLINDER BLOCK
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