Isuzu AU-4LE1T, Maintenance Manual

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4. AIR INTAKE SYSTEM
(1) Air Cleaner
Engine performance and life vary with the air intake conditions.
A dirty air cleaner element reduces the amount of intake air, causing
reduced engine output or disordered engine.
Also, a damaged element leads to abrasion of cylinders and valves,
resulting in increased oil consumption, reduced output and shortened
engine life.
Handling of air cleaner varies with the equipment model.
Perform periodic inspection and maintenance following the equipment
manufacturer’s instructions.
CAUTION:
1. Shorten the cleaning or change interval when the
equipment is used in dusty areas.
2. Change the element, if element damage is found during air
cleaner cleaning.
3. Take care not to cause air leakage (sucking) when
reassembling the air cleaner.