24 Valve Cummins Turbo Diesel

Improvements and design changes that set it apart from the 12 Valve series
Page 6 - Air Intake and Exhaust

Visit Geno's Garage for Truck accessories.

INTAKE AIR AND EXHAUST

• A new Turbocharger (Fig 30) is designed for quieter operation and needs no adjustment.

• The Filter-Minder (Fig 31) is retained from previous designs to indicate air filter restriction. The filter should not be opened unless the Filter Minder shows significant restriction.

• Two intake manifold heaters (Fig 32) are located under the intake plenum.

• The manifold heaters, which were previously controlled by the JTEC PCM, are now operated by the ECM to warm the intake air and improve cold starts.  Heater cycle time lengthens as the ambient temperature decreases. When the heaters have completed a cycle, the ECM turns off the Wait to Start lamp on the instrument panel.
• New for the ISB is the Manifold Air Pressure (MAP) sensor which measures manifold boost.
• A new one piece exhaust manifold (Fig 34) uses round ports which have better exhaust flow than square ports. The new exhaust manifold reduces warpage and leaks, and it is not interchangeable with older manifolds.

---