4. ENGINE
4-3-1
4-3 Measurement Procedure, Service Data and Corrective Action
For the maintenance of all parts, make measurements according to the following measurement procedure. If any
part is found to be defective or if any part is not within the allowable value, replace it with a new one. However, if it is
expected that any part within the allowable value will exceed the value before the next maintenance based on the
record of its use, be sure to replace such a part beforehand.
4-3-1 Cylinder Head
1) Checking the Combustion Surface for Distortion
(1) Remove the intake / exhaust valves and the fuel
injection valve from the engine. Clean the surface of
the cylinder head.
(2) Place a straight-edge along each of the four sides
and each diagonal of the cylinder head. Measure
the clearance between the straight-edge and the
combustion surface with a thickness gauge.
(3) Visually check if the combustion surface is free from
discoloration, cracks, and crazing. In addition, use the color check kit for cracks and crazing.
2) Intake / Exhaust Valve Seat
(1) Valve sinkage
Over long periods of use and repeated lappings, combustion efficiency may drop. Measure the sinking depth and
replace the valve and valve seat if the valve sinking depth exceeds the standard value.
Cylinder head
combustion
surface distortion
Standard
Wear limit
Refer to Section "3-2 1) Nominal and Allowable Values".
Standard.
Wear limit
Valve
sinkage
Intake
valve
Refer to Section "3-2 1) Nominal and
Allowable Values".
Exhaust
valve
Straight-edge
Thickness gauge
Measuring the combustion
surface distortion
(
)
Depth micrometer
(Measuring the valve sinkage)
Valve sinkage
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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