Manual

TROUBLESHOOTING
TNV IDI Service Manual
13-11
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 Coolant System
Excessive Radiator Cooling O O O Replace Thermostat.
See “Disassembly of Engine
Coolant Pump” on page 8-7.
Insufficient Radiator Cooling O OO
Replace Thermostat or Check for
Loose Fan Belt.
See “Disassembly of Engine
Coolant Pump” on page 8-7. or
Check and Adjust Cooling Fan V-
Belt on page 5-27
Insufficient Engine Coolant Level O OO
Check Water Leakage from Engine
Coolant System.
See “Engine Coolant System
Check” on page 8-7.
Cracked Water Jacket O O O Repair or Replace.
See “Disassembly of Engine
Coolant Pump” on page 8-7.
Stretched Fan Belt O O O Adjust the Belt Tension.
See “Check and Adjust Cooling
Fan V-Belt” on page 5-19.
Defective Thermostat O O O O Check or Replace.
See “Disassembly of Engine
Coolant Pump” on page 8-7.
Engine Oil System
Incorrect Engine Oil O O O O O O Use Correct Engine Oil.
See “Engine Oil Specifications” on
page 4-13.
Engine Oil System Leakage O O Repair.
See “Disassembly of Oil Pump” on
page 9-9.
Insufficient Delivery Capacity of Trochoid Pump
O Check and Repair.
See “Disassembly of Oil Pump” on
page 9-9.
Clogged Engine Oil Filter O O Clean or Replace.
See “Replace Engine Oil and
Engine Oil Filter” on page 5-26.
Defective Pressure Regulating Valve O Clean, Adjust or Replace.
See “Disassembly of Oil Pump” on
page 9-9.
Insufficient Engine Oil Level O O Add Correct Engine Oil.
See “Adding Engine Oil” on
page 4-14.
Overfilled Engine Crankcase O Check Engine Oil
See “Checking Engine Oil” on
page 4-14.
TNV_IDI_ServiceManual_(3TNV72 for YN only).book 11 ページ ２００７年１１月２９日 木曜日 午後２時５８分