Hino Motors J08E-VC User Manual (English)

Questions and Answers:

R
Robert JonesAug 17, 2025
Why is my Hino Motors Engine overheating and what should I do about it?
- R
  Rebecca PetersenAug 17, 2025
  Your Hino Motors Engine may be overheating due to several reasons related to the coolant system. Here's what might be happening and how to address it: * **Insufficient coolant:** Add more coolant to the system. * **Defective thermostat:** Replace the thermostat. * **Overflow of coolant:** This may be due to leakage of exhaust into the cooling system. In this case, you should repair the system. * **Damaged or deteriorated rubber hoses:** Replace any damaged rubber hoses. * **Coolant leakage:** Look for leaks from the coolant pump (replace the pump), rubber hose connections (retighten or replace the clamp), or the cylinder head gasket (replace the gasket).
C
caitlin50Aug 19, 2025
What to do if my Hino Motors J08E-VC radiator is overheating?
- O
  Olivia JohnsonAug 20, 2025
  If your Hino Motors Engine radiator is overheating, it could be due to several issues. The radiator might be clogged with rust, scale, iron oxide (due to exhaust leakage), mud, or other debris, in which case you should clean the radiator. There could also be coolant leakage, suggesting you should repair or replace the radiator. A damaged cooling fan should be replaced. Finally, a defective radiator cap pressure valve should be replaced.
H
holiverAug 22, 2025
What to do if my Hino Motors J08E-VC Engine has excessive oil consumption due to oil leakage from miscellaneous parts?
- R
  Rebecca BarreraAug 22, 2025
  If your Hino Motors Engine is experiencing excessive oil consumption due to leaks from various parts, several components could be the cause. Start by checking the oil seal, connections of oil lines, oil cooler, oil pan gasket, and O-rings for leaks. Replace the oil seal, oil cooler, oil pan gasket, or O-ring if they are leaking. Also, inspect the cylinder block for cracks or blowholes; if found, the cylinder block should be replaced. Finally, tighten connections of oil lines if they are leaking.
R
ryanhicksAug 26, 2025
Why is my Hino Motors J08E-VC Engine consuming too much oil because of the pistons, cylinder liners, and piston rings, and what can I do?
- W
  williamsbrianAug 26, 2025
  Excessive oil consumption in your Hino Motors Engine related to the pistons, cylinder liners, and piston rings can stem from several issues. Common causes include wear of the piston ring and cylinder liner, worn, sticking, or broken piston rings, insufficient tension on the piston rings, unsatisfactory breaking in of piston rings, unsuitable oil (viscosity too low), incorrectly fitted piston rings (upside down), or gaps of piston rings in cell with each other. The suggested solution is to replace the piston rings and cylinder liner. Also, reassemble piston rings if they have gaps in cell with each other; change oil as required if it is unsuitable.
F
Frank RiceAug 28, 2025
How to fix Hino Motors J08E-VC overheating caused by abnormal combustion?
- L
  lharrisAug 28, 2025
  If your Hino Motors Engine is overheating due to abnormal combustion, the cause may be poor fuel quality, so use good quality fuel. Alternatively, there might be a breakdown of the injector, in which case you should replace the injector.
R
Robert WhiteAug 30, 2025
What causes excessive oil consumption in my Hino Motors Engine related to the valve and valve guides, and how do I fix it?
- J
  Jamie CookAug 31, 2025
  Excessive oil consumption in your Hino Motors Engine, specifically related to the valve and valve guides, can be attributed to a few key issues. These include a worn valve stem (replace valve and valve guide), worn valve guide (replace valve guide), incorrectly fitted valve stem seal (replace the stem seal), or excessive lubricant on rocker arm (check clearance of rocker arm and shaft).
A
Anthony ButlerSep 2, 2025
What should I do if my Hino Motors J08E-VC is overheating due to issues with the coolant pump?
- G
  Garrett GonzalezSep 2, 2025
  If your Hino Motors Engine is overheating and you suspect the coolant pump, it could be due to bearing seizure or a damaged (corroded) vane. In either case, the solution is to replace the pump or the vane.
A
andersonlindseySep 5, 2025
What should I do if my Hino Motors J08E-VC Engine is overheating due to other problems?
- J
  jamesnelsonSep 5, 2025
  If your Hino Motors Engine is overheating due to other problems, consider these potential causes: defective or deteriorated engine oil (change the engine oil), unsatisfactory operation of the oil pump (replace or repair), insufficient oil (add oil), brake drag (repair or adjust), or a broken water temperature sensor (replace it).
P
popelindaSep 7, 2025
What causes excessive oil consumption in a Hino Motors J08E-VC due to excess oil feed and how can I resolve it?
- T
  Thomas MillerSep 7, 2025
  If your Hino Motors Engine has excessive oil consumption due to excess oil feed, it could be caused by a defective oil level gauge, which should be replaced. Another cause could be that the oil level is too high, so drain the excess oil.
V
Virginia NunezSep 12, 2025
What causes excessive oil consumption in my Hino Motors J08E-VC due to other problems?
- A
  astevensSep 12, 2025
  If your Hino Motors Engine has excessive oil consumption because it is overcooled (low temperature wear), warm up engine before moving vehicle and check cooling system.

Hino Motors J08E-VC Specifications

General

Engine Model	J08E-VC
Displacement	7.684 liters
Bore x Stroke	112 mm x 130 mm
Compression Ratio	18:1
Fuel System	Common rail direct injection
Turbocharger	Yes
Engine Type	In-line 6-cylinder, 4-stroke cycle, water-cooled, direct injection diesel engine

Summary

Foreword

Engine Introduction (J08E)

Engine Assembly

Details and diagrams of the engine assembly components.

Data and Specifications

Technical data and specifications for the J08E engine.

Troubleshooting

Common engine problems and their possible causes and remedies.

Troubleshooting (Common Rail System)

Troubleshooting specific to the common rail fuel system.

Engine Tuneup

Procedures for engine tune-up, including valve clearance checks.

Special Tools

List and illustration of special tools required for engine overhaul.

Overhaul Criteria

Criteria for determining if engine overhaul is necessary.

Dismounting and Mounting

Procedures for dismounting and mounting the engine assembly.

Liquid Gasket and Application Points

Guidelines for applying liquid gasket to engine parts.

Engine Mechanical (J08E)

Cylinder Head

Details on cylinder head components, overhaul, and repair.

Crankshaft Front End

Component locator and procedures for the crankshaft front end.

Flywheel and Flywheel Housing

Component locator, overhaul, and inspection for flywheel and housing.

Timing Gear

Component locator, overhaul, and inspection of the timing gear system.

Main Moving Parts and Cylinder Block

Component locator, special tools, overhaul, and repair for main moving parts.

Air Intake System (J08E)

Air Intake Manifold and Pipe

Component locator and dismounting/mounting procedures for the air intake manifold.

Air Intake

Component locator for the air intake system.

Air Cleaner

Description and overhaul procedures for the air cleaner.

Air Hose

Component locator and overhaul procedures for air hoses.

Air Flow Sensor

Component locator and replacement procedures for the air flow sensor.

Boost Pressure Sensor

Component locator and replacement procedures for the boost pressure sensor.

Exhaust System (J08E)

Exhaust Manifold and Pipe

Component locator and dismounting/mounting procedures for the exhaust manifold.

Exhaust Pipe and Muffler Unit

Description, component locator, and overhaul of the exhaust pipe and muffler.

DPR (Diesel Particulate Reduction System)

System configuration, structure, maintenance, and inspection of the DPR system.

Differential Pressure Sensor

Component locator and dismounting/mounting procedures for the differential pressure sensor.

Exhaust Control Cylinder

System configuration and inspection checklist for the exhaust control cylinder.

Emission Control (J08E)

EGR Valve and EGR Pipe

Component locator for the EGR valve and pipe assembly.

EGR Valve Description

Description of the EGR valve.

Closed Ventilator

Description and replacement of the closed ventilator.

Selective Catalytic Reduction (SCR)

General description, component locator, inspection, and repair of the SCR system.

Burner System

Component locator, warnings, dismounting/mounting, and inspection of the burner system.

Lubricating System (J08E)

Lubricating System Diagram

Diagram illustrating the lubricating system components and flow.

Oil Pump and Oil Strainer

Component locator, overhaul, and inspection/repair of the oil pump and strainer.

Oil Filter and Oil Cooler

Component locator, special tools, dismounting/mounting, and inspection/repair of oil filter and cooler.

Cooling System (J08E)

Cooling System Diagram

Diagram of the cooling system, showing component connections and flow.

Coolant Pump

Component locator for the coolant pump assembly.

Thermostat

Component locator and overhaul procedures for the thermostat.

Radiator and Intercooler

Component locator and overhaul for radiator and intercooler components.

Radiator

Component locator, special tools, overhaul, and inspection/repair of the radiator.

Cooling Fan

Component locator and inspection/repair procedures for the cooling fan.

Fuel System (J08E)

Fuel System Diagram

Diagram illustrating the fuel system components and flow.

Supply Pump

Description, component locator, special tools, and overhaul of the supply pump.

Common Rail

Description and replacement procedures for the common rail.

Injector

Description and replacement procedures for the injector.

Fuel Filter

Description and air bleeding procedures for the fuel filter.

Bubble Separator

Description of the bubble separator.

Fuel Tank

Component locator for the fuel tank.

Turbocharger (J08E)

Turbocharger Description

Detailed description and illustration of the turbocharger assembly.

Turbocharger Troubleshooting

Troubleshooting guide for common turbocharger issues and symptoms.

Turbocharger Overhaul Criteria

Conditions determining when a turbocharger overhaul may be needed.

Starter (J08E)

Starter Data and Specifications

Technical data and specifications for the starter.

Starter Description

Description and illustration of the starter components.

Starter Troubleshooting

Troubleshooting common starter issues and their remedies.

Starter Component Locator

Diagram identifying components of the starter.

Starter Overhaul

Procedures for disassembling the starter.

Starter Inspection and Repair

Inspection and repair procedures for starter components.

Air Compressor (J08E: 340 cm3)

Air Compressor Data and Specifications

Technical data and specifications for the air compressor.

Air Compressor Description

Description and illustration of the air compressor components.

Air Compressor Troubleshooting

Troubleshooting common air compressor issues and their remedies.

Air Compressor Component Locator

Diagram identifying components of the air compressor.

Air Compressor Special Tools

List of special tools required for air compressor overhaul.

Air Compressor Overhaul

Procedures for dismounting and overhauling the air compressor.

Air Compressor Inspection and Repair

Inspection and repair procedures for air compressor components.

Engine Control (J08E)

Accelerator Pedal Description

Description of the accelerator pedal assembly.

Engine ECU

Component locator and replacement procedures for the engine ECU.

Related product manuals

Hino Motors J08E-VC User Manual

Table of Contents