Cub-cadet Yanmar 3TNV72 User Manual Page 270

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TNV IDI Service Manual
13-7
Troubleshooting Charts
TNV IDI Service Manual
TROUBLESHOOTING
Troubleshooting Charts
Trouble Symptom Starting Problem
Insufficient
Engine
Output
Poor
Exhaust
Color
High Knocking Sound During Combustion
Abnormal Engine Sound
Uneven Combustion Sound
Engine
Surging
Excessive Engine Vibration
Difficulty in Returning to Low Speed
Excessive Fuel Consumption
Engine Oil
Excessive Blow-by Gas
Engine
Coolant
Air
Intake
Exhaust Temperature Rise
Corrective Action Reference Page
Engine Does Not Start
Engine
Starts But
Stops Soon.
Exhaust
Color
During
Work
During Idling
During Work Operation
Excessive Oil Consumption
Dilution by Diesel Fuel
Oil with Water
Low Oil Pressure
Overheat
Low Water Temperature
Pressure Drop
Pressure Rise
Exhaust
Smoke
Ordinary
White
Black
White
Black
Cause
None
Little
Much
Engine System
Improper Intake/Exhaust Valve
Clearance
O O O O O O Adjust the Valve Clearance.
See “Measuring and Adjusting
Valve Clearance” on page 6-34.
Compression Leakage from Valve Seat O O O O O O O O Lap the Valve Seat.
See “Valve Face and Valve Seat”
on page 6-28.
Intake/Exhaust Valve Seizure O O O O O O O O O O O
Correct or Replace Intake/Exhaust
Valve.
See “Inspection of Intake and
Exhaust Valves” on page 6-27.
Cylinder Head Gasket Blowout O O O Replace the Gasket.
See “Disassembly of Cylinder
Head” on page 6-21.
Seized or Broken Piston Ring O O O O O O O O O O O O Replace the Piston Ring.
See “Reassembly of Cylinder
Head” on page 6-31.
Worn Piston Ring, Piston or Cylinder O O O O O O O
Perform Honing and Use Oversize
Parts.
See “Honing and Boring” on
page 6-53.
Seized Crankpin Metal or Bearing O O O O O O O Repair or Replace.
See “Inspection of Crankshaft and
Camshaft Components” on
page 6-46.
Improper Arrangement of Piston Ring
Gaps
O O O O Correct the Ring Joint Positions.
See “Reassembly of Pistons” on
page 6-55.
TNV_IDI_ServiceManual_(3TNV72 for YN only).book 7 ページ 2007年11月29日 木曜日 午後2時58
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