Isuzu Engine >> EXCESSIVE SMOKING

Isuzu Engine >> EXCESSIVE SMOKING

Excessive Smoking On
Isuzu C223 (2.2L) Turbocharged Diesel Engines

The AERA Technical Committee has been informed of an excessive smoking situation on the Isuzu C223 turbocharged diesel engine. This engine is often used in Trooper II and P'up (pickup) vehicles.

The C223 turbo-diesel engine has a PCV system that is complicated enough to be classified as intimidating. The crankcase ventilation system uses two devices not normally found in gasoline engine applications.

The first device, is an oil separator/retention tank, which acts as nothing more than a drop filter. Crankcase fumes travel through a mesh medium that allows much of the oil to collect and drop out of the air stream into the bottom of the tank. Collected oil will drain back into the oil pan. The remaining oil fumes are drawn through the induction system and become part of the combustion mixture.

The second device is part of the return line drain from the retention tank. This return line uses a one way check valve, Part # 8-94145-952-0. that allows oil to return to the oil pan, but does not expose the lower crankcase to the vacuum of the PCV system. If this check valve becomes clogged or stuck closed, oil
may accumulate in the retention tank. Excessive amounts of oil will then enter the induction system past the retention tank, resulting in dramatic engine smoking. Smoke is particularly heavy during morning engine startup.

The AERA Technical Committee

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