ENGINE MECHANICAL 6A–3
Combustion Chambers
Isuzu’s unique combustion chamber design provides
easy starting, maximum power output, and operating
economy.
Direct fuel injection is used. Each cylinder has an
injection nozzle placed precisely at the center of the
cylinder.
Intake ports generate maximum swirl effect for the air-
fuel mixture. Exhaust ports provide minimum exhaust
resistance.
Valve Arrangement
Each cylinder has 2 intake valves and 2 exhaust valves.
The intake valves use Isuzu’s unique inlet ports to
provide high efficiency and complete combustion.
The exhaust valves are connected to a single exhaust
port.
Lubricating System
All moving engine parts are lubricated by a gear pump
pressure circulation system.
Oil is pumped from the crankcase through the oil filter to
the oil cooler where it is cleaned. From the oil cooler, the
oil travels to the cylinder block main oil gallery from
where it circulates to lubricate the engine parts.
Oil jets in the oil gallery spray oil to the inside surfaces of
the pistons to provide optimum lubrication and cooling.
Oil Pump and Oil Filter
The gear-type oil pump with relief valve is driven by the
timing gear.
A full-flow oil filter with a highly efficient paper element is
used.
If the oil filter element becomes clogged, a by-pass valve
opens to route the oil directly to the oil gallery.
Oil Cooler
Oil temperature rises as the engine warms up with a
resulting decrease in lubricating efficiency. The oil
cooler operates to maintain low oil temperature and high
lubricating efficiency.The oil cooler consists of a body
and cooling element.
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