How to install the water pump for an Isuzu 4JH1 engine



1.Installthe water pump assembly
·Set O-ring in water pump body groove.

Install water pump assembly,and tighten to
specified torque.
Tightening torque: 20 N·m (2.0 kg-m/14 Ib-ft)
2.Install the AC generator drive belt.
·Install the AC generator drive belt.
·Depress theACgenerator_drive belt mid-
portion with a 98N(10 kg/22Ib)force.
·Tighten the fixing bolt to the specified torque.
Tightening torque
Adjust plate lock bolt:
19 N·m(1.9 kg-m/14 Ib·ft)
Generator fixing bolt:
40 Nm(4.1 kg-m/30 Ib-ft)

Legend
1.P/S oil pump drive belt
2.AC generator drive belt.

3.Install the support rubber.
·Install the support rubber while raising the
engine.
·Tighten the fixingnuts to the specified torque.
Tightening torque
Engine foot side
82Nm(8.4 kg-m/61 Ib-ft)
Crossmemberside:40 N·m(4.1 kg-m/30Ib-ft)
4.Install the cooling fan assembly.
·Mount fan pulley and cooling fan assembly on
the water pump and tighten to the specifed
torque.
Tightening torque: 8Nm(0.8 kg-m/69 Ib-in)
5.Install the fan shroud.
·Install the fan shroud and reservoir tank hose
and bypass hose.

6.Install the floor support cover.(Non-ilt cab model
only)

7.Install the sub engine cover.(Non-tilt cab model
only)

8.Install the parking brake lever assembly.(Non-tilt
cab model only)
Refer to “BRAKES”in Section 5C.
9.Install the changelever assembly.(Non-tilt cab
model only)
Refer to “Manual Transmission”in Section 7B.
10.Install the driver seat.(Non-tilt cab model only)
Refer to “FRAME AND CAB”Section 2.

11.Install the engine cover.(Non-tilt cab model only)

12.Refilthe engine coolant.
13.Connect the battery cable negative terminal.