Isuzu 4JH1 User Manual

6A – 126 ENGINE MECHANICAL
LUBRICATION SYSTEM
LUBRICATING OIL FLOW
1. Oil Pump Relief Valve Operating Pressure: 6.2 - 7.8 kg/cm
2
(608 – 764 kPa)
2. Regulating Valve Operating Pressure: 5.7 - 6.3 kg/cm
2
(558.6 - 617.4 kPa)
3. Oil Cooler Relief Valve Opening Pressure: 2.8 - 3.4 kg/cm
2
(270 – 330 kPa)
4. Oil Filter Relief Valve Opening Pressure: 0.8 - 1.2 kg/cm
2
(78.4 - 117.6 kPa)
5. Oil Pressure Switch Operating Pressure: 0.3 - 0.5 kg/cm
2
(29.4 - 49.0 kPa)
6. Regulating Valve: 1.8 - 2.2 kg/cm
2
(176 – 216 kPa)
The 4J series engine has a full flow type lubricating system.
Lubricating oil is pumped from the oil pump to the cylinder body oil gallery through the oil cooler and the oil filter. It is
then delivered to the vital parts of the engine from the cylinder body oil gallery.
Oiling jets installed on the cylinder body spray engine oil to the piston backside faces to achieve maximum piston
cooling effect.

Isuzu 4JH1 Specifications

General

Bore x Stroke	95.4 mm x 104.9 mm
Compression Ratio	18.5:1
Fuel System	Direct injection
Cylinder Configuration	Inline-4
Valves per Cylinder	4
Fuel Type	Diesel
Engine Type	Diesel, four-stroke
Displacement	3.0 liters
Maximum Torque	217 lb-ft (294 Nm) @ 1800 rpm
Oil Capacity	6.5 liters (with filter)