How to Do Air Bleeding for 4HK-1 Engine on ISUZU

Posted by Phoebe on March 18th, 2021

This article will show you guide on how to do air bleeding for Isuzu 4HK-1 engine.

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Insufficient air bleeding may cause the DTC store or driveability concern.

1. Before starting the engine

a. Fit a tray below the fuel filter (below the air bleed plug).

b. Loosen the plug adequately and operate the priming pump more than 20 times until the fuel

near the plug overflows.

c. Tighten the plug, and operate the priming pump more than 10 times until it is filled with fuel. After waiting for approximately a minute, loosen the plug and bleed out the air in the fuel filter. (This work must be repeated a minimum of three times until no more air comes out from the plug.)

d. Tighten the plug firmly and wipe the fuel in the surrounding area. Operate the priming pump (10 to 15 times) till it is filled with fuel and then send fuel to the engine.

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2. After starting the engine

a. Start the engine by rotating the starter without depressing the accelerator pedal.

b. After starting, maintain the idling rotation for 5 seconds.

c. Slowly rotate the idling control knob clockwise and maintain it for 3 minutes.

d. Fully depress the accelerator pedal and increase the rotations to maximum. (Repeat this operation several times)

e. Rotate the idling knob counterclockwise and return to idling mode.

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