N14 Base Engine Troubleshooting and Repair Manual – 006-005   Cylinder Misfires or Smokes

NOTE: Do

not run the automated Cylinder Performance Test on engines that are smoking at idle.

Perform the Automated Cylinder Performance Test at least twice. Refer to the appropriate electronic service tool manual.

Minimum cylinder contribution is 71%.

Cut out each cylinder, with the Cylinder Cutout Test, while watching the exhaust smoke. Refer to the CELECT™ Compulink™ or Echek™
Diagnostic Cartridge Manual.

Replace the injector in the cylinder that causes a reduction in smoke when cut out.

To locate a smoking cylinder, use a pyrometer or infrared temperature gun to measure the exhaust manifold surface temperature at each cylinder port.

The maximum exhaust manifold surface temperature at idle is 143°C [290°F].

A cylinder is smoking if: > >The exhaust manifold surface temperature at that exhaust port exceeds the above specification.> >The exhaust manifold surface temperature at that port is significantly higher than that for the other cylinder ports.> >

NOTE: If this test is inconclusive, tilt back the exhaust manifold to visually locate the smoking cylinder.

CAUTION  Do not place hand on the exhaust manifold if the engine is hot or heavily black smoking.

An alternate method is to place your hand on the exhaust manifold at each cylinder port. A smoking cylinder will feel hot.

Replace the injector in the cylinder that is producing the smoke. Refer to Procecdure 006-026.

To locate a smoking cylinder, use a pyrometer or infrared temperature gun to measure the exhaust manifold surface temperature at each cylinder port.

The maximum exhaust manifold surface temperature at idle is 143°C [290°F].

A cylinder is smoking if: > >The exhaust manifold surface temperature at that exhaust port exceeds the above specification.> >The exhaust manifold surface temperature at that port is significantly higher than that for the other cylinder ports.> >

NOTE: If this test is inconclusive, tilt back the exhaust manifold to visually locate the smoking cylinder.

CAUTION  Do not place hand on the exhaust manifold if the engine is hot or heavily black smoking.

An alternate method is to place your hand on the exhaust manifold at each cylinder port. A smoking cylinder will feel hot.

Replace the injector in the cylinder that is producing the smoke. Refer to Procecdure 006-026.