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Hino Trouble Shooting

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Hino Trouble Shooting



Engine Does Not Crank

And - Starter does not operate

  • Discharged battery
  • Battery relay switch disconnected
  • Disconnected, loose or corroded battery terminals
  • Poor ground
  • Starting switch defective
  • Magnetic switch defective
  • Starting relay defective

And - Starter operates

  • Piston seizure
  • Bearing seizure
  • Foreign matter in cylinder
  • Excess mechanical resistance in engine, due to poor lubrication
  • Injection pump plunger seized


Engine Cranks

And - Fuel not reaching injection pump

  • Fuel level too low
  • Clogged fuel lines
  • Air in fuel lines
  • Feed pump defective
  • Clogged fuel filter
  • High pressure injection line connection loose
  • Delivery valve sticking
  • Injector faulty
  • Injection nozzle faulty
  • Clogged injection nozzle
  • Fuel injection timing improper
  • Heater plug defective
  • Air cleaner clogged
  • Low compression
  • Water in fuel

And - Fuel reaching injection pump



Injection pump defective

  • Governor out of adjustment
  • Rack and pinion malfunctioning
  • Nozzle spring a
  • Adjusting screw loose
  • Nozzle port clogged
  • Injection pressure too low
  • Nozzle spray incorrect
  • Delivery valve defective

High pressure injection pipe clogged

Injector defective



Insufficient fuel supply

  • Clogged fuel line or air in system
  • Feed pump defective
  • Clogged fuel filter
  • Injection insufficient
  • Injection nozzle defective
  • Nozzle spray incorrect
  • Improper injection timing
  • Clogged air cleaner
  • Intake valve tappet improperly adjusted
  • Low compression
  • Engine overheating

Insufficient air intake




Cooling system defective

  • Heat exchanger cap defective
  • Insufficient coolant water
  • Thermostat defective
  • Clogged heat exchanger
  • Loose or slipping belt
  • Coolant pump defective
  • Sediment in water jacket
  • Sea water pump defective
  • Sea cock closed
  • Sea water strainer clogged


Fuel injection system defective

  • Injection pump timer defective
  • Improper injection timing with injection pump installed
  • Excessive fuel injection
  • Injector nozzle defective

Lubrication system defective

  • Engine oil level too low
  • Oil pump defective
  • Incorrect adjustment of oil regulator
  • Engine oil deteriorated
  • Oil cooler defective
  • Cylinder carboned
  • Cylinder head cracked
  • Gas leak from cylinder head gasket



Serious diesel knocking

  • Improper fuel injection timing
  • Uneven injection by injection pump
  • Lack of compression
  • Oil leaking into combustion chamber
  • Fuel cetane value too low

Mechanical knocking

  • Excessive worn cylinder and piston
  • Excessively worn piston and bushing
  • Worn crankshaft and connecting rod bearing
  • Foreign matters in cylinder
  • Improper valve clearance



Excessive white smoke

  • Delayed fuel injection timing
  • Water in fuel
  • Oil leaking into combustion chamber
  • Insufficient combustion due to cold

Excessive black smoke

  • Advance fuel injection timing
  • Fuel injection volume excessive
  • Nozzle spray incorrect
  • Compression pressure insufficient



  • Poor fuel quality
  • Fuel leakage
  • Operation inadequate
  • Engine over-cooling
  • Clogged air cleaner and fuel filter
  • Injection pump defective
  • Improper injection timing
  • Injection nozzle defective
  • Improper engine compression
  • Improper valve timing
  • Seizure or excessive friction in moving engine parts



  • Improper oil
  • Oil level too high
  • Oil leakage
  • Omission of oil changing
  • Omission of engine warm-up
  • Engine overheating
  • Worn cylinders, pistons and rings
  • Inadequate supply of oil to rocker arm
  • Sucking oil through valve guide


Black Smoke

  • Improper oil
  • Turbocharger does not rotate smoothly
  • Carbon build up on the seal rings of turbine side, resulting in binding of rotation
  • Bearing seized
  • Contact and/or damage of turbine wheel or impeller blades

Exhaust system

  • Exhaust gas leak before turbocharger
  • Clogged or blocked exhaust piping

White smoke

  • Clogging or deformation of oil return pipe, resulting in oil leak to compressor or turbine side
  • Damaged or worn seal rings due to excessive wear of bearing

Low output

  • Gas leakage from exhaust system
  • Air leakage from compressor side
  • Dirty or damaged turbocharger


Poor response of turbocharger

  • Carbon build up on the seal rings of turbine side, resulting in binding of rotation

Abnormal noise and vibration


  • Contact of rotating parts


  • Loose connection between turbo and intake/exhaust piping
  • Damaged bearing, contact of rotating parts, foreign material



Water discharge is not sufficient

  • Sucking air
  • Clogging of suction pipe and/or strainer
  • Damaged impeller

Abnormal noise or vibration

  • Worn bearing
  • Foreign material in the casing
  • Incomplete mounting

Bearing wears frequently

  • belt tension too tight

Damage of impeller

  • When it has been operated for a long period
  • When it has been operated without water
  • When it has been operated at higher RPM
  • Too high or low water temperature
  • When it has not been operated for an extended period
  • Foreign material in the pump


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