Isuzu N-Series. Service manual — part 581
6A1-12 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
OIL COOLER (Oil Cooler Model)
Component
4JG2, 4JB1, 4JB1-TC, 4JH1-TC
Removal
Preparation
• Disconnect battery ground cable
• Drain coolant
• Put rag to beneath side of oil cooler to prevent oil
leaking.
1. Water Hose
• Disconnect water inlet and outlet hose.
2. Oil Cooler Fixing Bolt
3. Oil Cooler
Inspection
Relief Valve
1. Attach an oil pressure gauge to the oil gallery near
the oil filter.
2. Start the engine to check the relief valve opening
pressure.
Legend
1. Water hose
3. Oil cooler
2. Oil cooler fixing bolt
N6A3237E
Relief Valve Opening
Pressure
kPa (kg/cm
2
/psi)
Type1
559 — 618 (5.7 — 6.3/81.0
— 89.6)
Type2
422 — 461 (4.3 — 4.7/61.1
— 66.8)
4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-13
Oil Cooler
Check for water leakage at the water passage.
1. Plug one side of the oil cooler water passage.
2. Submerge the oil cooler in water.
3. Apply compressed air (2 kg/cm
2
(28.5 psi / 196.0
kPa)) to the other side of the oil cooler water pas-
sage.
If air bubbles rise to the surface, there is water
leakage.
Installation
1. Oil Cooler
• Install the O-ring to oil filter body and set the oil
cooler.
2. Oil Cooler Fixing Bolt
Tighten:
• Oil cooler bolt to 29 N
⋅m (3.0 kg⋅m / 22 lb⋅ft)
3. Water Hose
• Connect water hose.
N6A3238E
N6A3239E
N6A3240E
6A1-14 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
OIL FILTER CARTRIDGE
Component
4JG2, 4JB1, 4JB1-TC, 4JH1-TC
Removal
• Place a receptacle beneath the oil filter to contain
the drained oil.
• Remove the oil filter cartridge using filter wrench.
Filter wrench: 5-8840-0200-0
Installation
• Lightly oil the O-ring of oil filter cartridge.
• Turn in the new oil filter cartridge by hand until the
sealing face is fitted against the O-ring.
• Use the filter wrench to turn in the oil filter and ad-
ditional one and 1.1/8 turns.
• Start the engine and check for oil leakage from oil
filter.
N6A3241E
N6A3242E
4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-15
CYLINDER HEAD COVER
Component
Removal
Preparation
• Disconnect battery ground cable.
1. PCV Hose
• Disconnect the PCV hose from intake pipe side.
2. Cylinder Head Cover
Installation
1. Cylinder Head Cover
• Apply engine oil to the rocker arms and the valve
springs.
• Install the cylinder head cover gasket to the cylin-
der head cover.
• The gasket must be perfectly smooth with no loose
areas.
• Tighten the cylinder head cover nuts to the speci-
fied torque.
Tighten:
• 13 N
⋅m (1.3 kg⋅m / 9 lb⋅ft)
2. PCV Hose
• Connect the PCV hose to the intake pipe.
• Connect battery ground cable.
Legend
1. PCV hose
2. Cylinder head cover
N6A3243E
N6A3244E
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