How do I replace the timing belt?

The DOHC and SOHC engines both use the same service and repair procedure from Isuzu. Make note that the DOHC and SOHC engines both use a single gear for the camshaft but use different alignment marks.

Removal:
Preparation: Battery ground cable.
Air cleaner assembly .
Radiator upper fan shroud .
Remove from radiator.
Cooling fan assembly.
Remove four nuts, then the cooling fan assembly.
Power steering pump drive belt .
Air conditioning compressor drive belt .
Generator drive belt.
Fan pulley assembly.
Crankshaft pulley assembly.
Using special tool J-8614-O1, hold crankshaft pulley.
Remove center bolt, then the pulley.
Oil cooler hose.
Remove two cooler hose bracket fixing bolts on the timing cover.
Timing belt cover.
Pusher.
CAUTION: The Pusher prevents air from entering the oil chamber. Its rod must always be facing upward.

Timing belt
To prevent the timing belt from getting out of position, put the alignment mark on the cam pulley, the crankshaft pulley and the timing belt before removing the timing belt.

CAUTIONS:
Do not bend or twist the belt, otherwise its core could be damaged. The belt should not be bent at a radius less than 3Omm.
Do not allow oil or other chemical substances to come in contact with the belt. They will shorten the belt life.
Do not attempt to pry or stretch the belt with a screwdriver or any other tool during installation.
Store timing belt in a cool and dark place. Never expose the belt to direct sunlight or heat.

INSTALLATION:

Timing belt:

Align groove of crankshaft timing pulley with mark on oil pump.

Align the marks on the camshaft timing pulleys with the corresponding dots on the front plate.
NOTE: When timing marks are aligned, no pistons will be on T.D.C.

Install timing belt. Align the dotted alignment mark on the timing belt with the mark on the crankshaft gear.

NOTE: For correct belt installation, the letters the belt must be able to be read as viewed from the front of the vehicle.

It is recommended for easy installation that the belt be secured with double clips after it is installed to each pulley.

Align the alignment mark (white line) on the timing belt with the alignment mark on the RH bank camshaft timing pulley (on the left side as viewed from the front of the vehicle). Secure the belt with a double clip.
Turn the crankshaft counterclockwise to remove the belt slack between the crankshaft timing pulley and the RH bank camshaft timing pulley.
Install the belt on the water pump pulley.
Install the belt on the idle pulley.
Align the alignment mark (white line) on the timing belt with the alignment mark on the LH bank camshaft timing pulley. (If the belt is difficult to install, turn the camshaft pulley slightly counterclockwise.)
Turn the crankshaft pulley clockwise to give some slack between the crankshaft timing pulley and the RH bank camshaft timing pulley.
Install the pusher while pushing the tension pulley to the belt.
Pull out the pin from the pusher.
Fig. 16 Belt tension pusher installation

NOTE: When reusing the pusher, press the pusher to retract the rod (1.4 mm piano wire).

Remove double clips from pulleys. Temporarily install the crankshaft pulley. Turn the crankshaft pulley clockwise by two turn and make sure that the rod protrusion is within the standard.
Standard: 4 - 6 mm (0.16 - 0.24 in)

If out of standard, remove pusher, loosen adjusting bolt, and readjust. Repeat from step 11. Tighten adjusting bolt to the specified torque.
Torque: 42 Nm (31 ft lbs)

Pusher
Tighten bolts to the specified torque.
Torque: 19 Nm (14 ft lbs)

Timing belt cover
Remove crankshaft pulley that was installed in step 12.
Tighten bolts to the specified torque.
Torque: 17 Nm (12 ft lbs)

Oil cooler hose
Tighten oil cooler hose bracket bolts to the specified torque.
Torque: 22 Nm (16 ft lbs)

Crankshaft pulley
Using special tool J-8614-01, hold the crankshaft pulley.
Tighten center bolt to the specified torque.
Torque: 167 Nm (123 ft lbs)

Fan pulley assembly
Tighten fixing bolt to the specified torque.
Torque: 22 Nm (16 ft lbs)

Generator drive belt.
Engage and adjust
Air Conditioning drive belt
Engage and adjust
Power steering pump drive belt
Engage and adjust
Cooling fan assembly
Tighten nuts to the specified torque.
Torque: 8 Nm (69 in lbs)

Radiator upper fan shroud
Air cleaner assembly