Isuzu NHR 4J Series, Workshop Manual

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6A1 – 92 4JB1/4JB1T/4JB1TC/4JG2 - ENGINE
• Block the crankshaft with a piece of hard wood to
prevent the flywheel form turning.
• Apply a coat of engine oil to the threads of the flywheel
bolts.
• Align the flywheel with the crankshaft dowel pin.
• Tighten the flywheel bolts to the specified torque in two
steps using the Angular Tightening Method.
Follow the numerical order shown in the illustration.
Flywheel Bolt Torque N ∙ m (kg ∙ m/lb ∙ ft)
1st Step 2nd Step
59 (6.0/43) 60° - 90°
11. Water Pump Assembly
• Fit the O-ring to the water pump body.
• Remove the water pump assembly and tighten bolts to
the specified torque.
Water Pump Bolt Torque N ∙ m (kg ∙ m/lb ∙ in)
20 (2.0/14)
10a. Timing Pulley Housing
• Install the timing pulley housing the cylinder body.
Take care not to twist the front oil seal.
• Tighten the timing pulley housing together with the
timing pulley housing gasket to the specified torque.
Timing Pulley Housing Bolt Torque N ∙ m (kg ∙ m/lb ∙ ft)
19 (1.9/14)
• Cut away the flash from the gasket.
10. Timing Gear Housing
• Install the timing gear housing the cylinder body.
• Tighten the timing gear housing together with the
timing gear housing gasket to the specified torque.
Timing Gear Housing Bolt Torque N ∙ m (kg ∙ m/lb ∙ ft)
19 (1.9/14)
• Cut away the flash from the gasket.
9. Front Oil Seal (Belt Drive Model)
• Install oil seal using special tool.
Front Oil Seal Installer: 5-8840-2361-0
Notes:
Wipe off rust and scraps clean from the press-in
portion of the oil seal.
Take note of the press-in direction of the oil seal.
1) With the oil seal attached to the sleeve, put it in the
front end of the crankshaft.
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