NOISE AND EMISSION CONTROL PREVENTIVE MAINTENANCE
– 254 – Y53-6033
Regional Haul (R05/10)
Joints and Clamps
• Check for leaks, and tighten as necessary. Check for
deterioration or dents in pipes and clamps which
could allow exhaust to escape.
Piping
• Check exhaust piping for rust, corrosion, or damage.
Replace deteriorated piping before holes appear. If
piping is perforated at any point, temporary patching
or lagging is acceptable until you can have permanent
repairs made. On turbocharged engines, check joints
at flanges and mounting brackets for tightness.
Diesel Particulate Filter (DPF)
NOTE: Use only exact replacement components
in exhaust systems. Certain components contain
integral catalytic converters essential for compli-
ance with EPA emission standards. Using a non-
compliant component as a replacement could
violate these standards and also void the emis-
sion system’s warranty.
Check clamps and mounting brackets for security. Check
internal baffling for security. You can do this by listening
for rattling sounds while tapping the unit with a rubber
mallet or revving the engine up and down through its nor-
mal operating range. Check the DPF for rust and corro-
sion.
Exhaust Tail Pipe
Check the mounting. Tighten as necessary. The miter cut
at the tip of the pipe must be facing the rear of the vehicle.
Do not modify the end of the pipe in any way.
Engine Fan and Shroud
WARNING! Do not work on the fan with the
engine running. The engine fan can engage at
any time without warning. Anyone near the
fan when it turns on could be killed or seri-
ously injured. Before turning on the ignition,
be sure that no one is near the fan.
Check all fasteners for tightness. Check for stress cracks
in the shroud. Make sure the shroud is adjusted so that it
does not touch the fan blades.
Check to verify that the fan is disengaged (not turning)
with the engine running at normal operating temperatures
(from cold to the point that the fan engages).
