Chrysler Full-Size Trucks 1997-2000 Repair Guide

Crankcase Ventilation System (CCV)


The 2.5L and 8.0L engines are fitted with a Crankcase Ventilation (CCV) system. It performs the same function as the PCV system described above, but does not use a vacuum-controlled valve.


A molded vacuum tube connects a fitting on the intake manifold to a fixed orifice fitting of a calibrated size. This fitting meters the amount of crankcase vapors drawn out of the engine. The fixed orifice fitting is located on the side of the valve cover on 2.5L engines, the right valve cover on 8.0L engines.

A fresh air supply hose from the air cleaner housing is connected to a fitting at the top/rear of cylinder head cover on 2.5L engines, on the left valve cover on 8.0L engines.

When the engine is running, fresh air enters the engine through the fresh air supply hose and mixes with crankcase vapors. Engine manifold vacuum draws the vapor/air mixture through the fixed orifice and into the intake manifold. The vapors are then consumed during engine combustion.

Component testing

No maintenance is required. Check hoses for condition and replace if cracked or abraded.

On the 8.0L engine, only the right valve cover hose has a fixed orifice in the system (gray in color). The left side (fresh air) hose has a black connector. Do NOT interchange left and right side hose connections, as this would restrict fresh air supply.

Click image to see an enlarged view

Fig. CCV fixed orifice and hose-8.0L engine