Exhaust Leaks - Dodge D250 1990 Service Manual

Air System
Page 11 -4
Exhaust System and intake Manifoid
DODGE Turbo Diesel
>wer from a turbocharged engine can
i air leaking from loose connections
tube or intake manifold.
in addition to the visual inspection for cracks and loose fittings,
liquid soap can be applied to the crossover tube, connections
and the manifold cover sealing surfaces to find the leaks. The
leaks will create bubbles that are easier to detect.
Measurement of manifold pressure is described in this Section.
Exhaust Leaks
Inspect for exhaust leaks at the exhaust manifold and
turbocharger. Also check for exhaust pipe restrictions. Leaks or
restrictions will cause the turbine and impeller to operate at a
lower speed and reduce the amount of air being forced into the
cylinders. Again, the symptom will be excess smoke, low
manifold pressure and low power.
] Exhaust leaks can often be detected audibly and usually
visually by a discoloration caused by the escaping hot gases.
Don't overlook exhaust restrictions as a cause of low power. If
the exhaust gasses cannot flow freely, the turbocharger will not
operate efficiently.