4. ENGINE
4-3-10
4-3-4 Piston and Piston Rings
1) Checking the Piston
(1) Remove carbon deposits from the head and com-
bustion surface of the piston while taking care not to
damage the piston. Check if there are any cracks or
damage.
(2) Check the outer surface and ring grooves of the pis-
ton, and replace it if worn or damaged.
2) Measuring the Piston Outside Diameter
3) Shapes of Piston Rings
Standard
Wear limit
Piston outside dia.
Refer to Section "3-2 1) Nominal
and Allowable Values".
Minimum clearance
between piston
and cylinder
Measuring
position
0.87 to 0.98 in
(22 to 25 mm )
(Measuring the piston outside diameter)
Top ring
Second ring
Oil ring
026587-00E
To measure the piston outside diameter, measure the long
diameter of the oval hole in the vertical direction to the
piston pin bush hole at a position which is 22 to 25 mm
above from the lower end of the piston.
Summary of Contents for ViO12-2A
Page 1: ...SERVICE MANUAL EXCAVATOR ViO12 2A...
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Page 109: ...5 3 1 5 ELECTRIC SYSTEM 5 3 Wiring Diagram...
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Page 219: ...6 HYDRAULIC SYSTEM 6 7 8 1 4 3 8 7 12 10 10 15 a b c Loctite 262 0 30Nm 0 45Nm...
Page 348: ...7 ADJUSTMENT AND REPAIR 7 5 31 6 Control Levers Pilot valves Control valve...
Page 349: ...7 ADJUSTMENT AND REPAIR 7 5 32 7 Upperstructure Implement Bucket cylinder Arm cylinder...
Page 351: ...7 ADJUSTMENT AND REPAIR 7 5 34 9 Undercarriage High speed travel solenoid valve...
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Page 360: ...CHAPTER 8 PERIODIC INSPECTION AND SERVICING 8 1 List of Periodic Inspection and Servicing 8 1...
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Page 364: ...CHAPTER 9 FUEL LUBE OIL AND GREASE RECOMMENDED 9 Fuel Lube Oil and Grease Recommended 9 1...
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Page 406: ...CHAPTER 11 REFERENCE DATA 11 1 Specifications for Attachment 11 1...
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