Doosan DX60R Shop Manual page 449

Failure Diagnosis Table
Starting failure
Symptoms and conditions of failure
Starter does
not rotates
Possible causes
Intake/exhaust valves with improper clearances
Compressed air leaks from a valve seat
Intake/exhaust valve seized
Cylinder head gasket blown
Piston ring stuck or broken
Piston ring joint not correctly positioned
Crank pin metal and bearing seized
Piston ring joint not correctly positioned
Piston ring reverse-installed
Crank pin metal and journal metal worn
Connecting rod bolt loose
Foreign matter in a combustion chamber
Gear backlash too large
Intake/exhaust valve guide worn
Governor not properly adjusted
Intake/exhaust valves with improper opening/
closing timings
Engine's mounting loosened or damaged
Floor fouled
Waste gate malfunctioning
Radial metal worn
Engine
Engine stall Engine
Speed control error
after start up output low
Starter Work Smoke
Smoke No load
rotates load color
O O O
•
O
O O O O
O
O O O
O O
O O O O
O
O O O
O
•
O O O O
O
O O
Noise and Cooling Intake
Lubricating oil
vibration water air
O O
O O O
O O O O O
O O
O O O O O O O
O O O O
O O
O O
O O O
O O O
O O O
O O
O
O O
O
O O O O
• •
O
O
•
O
Exhaust gas Fuel Electrical parts
Work
load
Corrective Action
O Adjust the valve clearances.
O O O O Lap the valve seat.
Repair or replace the intake/
O O
exhaust valves.
Replace the gasket.
O O Replace the piston rings.
Apply honing,
O
oversized parts.
O Repair or replace.
O Correct the joint position.
O Reinstall.
Measure and replace.
Tighten with specified torque.
O Disassemble and repair.
Adjust the gear engagement.
O Measure and replace.
Adjust.
O Adjust the valve clearances.
Repair or replace the faulty
part(s).
•
O Clean the floor.
•
O Disassemble and inspect.
O Disassemble and inspect.
Referenced page number
See "Measuring and Adjusting
Valve Clearance" on page -123
and use See "Honing and Boring" on
page -147
See "Measuring and Adjusting
Valve Clearance" on page -123
SP001434
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