Manual

TROUBLESHOOTING
TNV IDI Service Manual
13-15
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 Pages
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
Fuel System
Air in Fuel System O O O Bleed the Air.
See “Priming the Fuel System” on
page 4-12.
Clogged or Cracked Fuel Line O O O Clean or Replace.
See “Check and Replace Fuel
Hoses and Engine Coolant Hoses”
on page 5-37.
Insufficient Fuel Supply to Fuel Injection Pump
OO O
Check the Fuel Tank Cock, Fuel
Filter, Fuel Line, and Fuel Feed
Pump.
See the appropriate procedure in
Periodic Maintenance on page 5-1
Uneven Injection Volume from Fuel Injection Pump
OOOO OOOO O Check and Adjust.
See “Testing of Fuel Injectors” on
page 7-24.
Excessive Fuel Injection Volume O O O O O O O Check and Adjust.
See “Testing of Fuel Injectors” on
page 7-24.
Poor Spray Pattern from Fuel Injection Nozzle
OOOO OOOO O Check and Adjust.
See “Testing of Fuel Injectors” on
page 7-24.
Priming Failure O
Foreign Matter Trapped in the
Valve Inside the Priming Pump
(Disassemble and Clean).
See “Fuel System Components” on
page 7-10.
Clogged Strainer at Feed Pump Inlet O Clean the Strainer.
See “Drain Fuel Tank” on
page 5-25.
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