Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
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Preventive Maintenance<br />
Piping<br />
• Check exhaust piping for rust, corrosion, or damage.<br />
Replace deteriorated piping before holes appear. If piping<br />
is perforated at any point, temporary patching or lagging<br />
is acceptable until you can have permanent repairs<br />
made. On turbocharged engines, check joints at flanges<br />
and mounting brackets for tightness.<br />
Mufflers<br />
NOTE: Use only an exact replacement muffler in<br />
exhaust systems. Certain mufflers contain integral<br />
catalytic converters essential for compliance with<br />
EPA emission standards. Using a noncompliant muffler<br />
as a replacement could violate these standards<br />
and also void the emission system’s warranty.<br />
• Check muffler, clamps, and mounting brackets. Tighten if<br />
necessary. Inspect muffler for signs of rust or corrosion.<br />
• Check internal baffling. You can do this by listening for<br />
rattling sounds while tapping the muffler with a rubber<br />
mallet or revving the engine up and down through its normal<br />
operating range.<br />
Exhaust Tail Pipe<br />
Noise and Emission Control<br />
• Check the mounting. Tighten as necessary. The miter<br />
cut at the tip of the pipe must be facing the rear of the<br />
vehicle. Do not modify the end of the pipe in any way.<br />
Engine Fan and Shroud<br />
WARNING! Do not work on the fan with the<br />
engine running. The engine fan can engage at<br />
any time without warning. Anyone near the fan<br />
when it turns on could be killed or seriously<br />
injured. Before turning on the ignition, be sure<br />
that no one is near the fan.<br />
• Check all fasteners for tightness. Check for stress cracks<br />
in the shroud. Make sure the shroud is adjusted so that it<br />
does not touch the fan blades.<br />
• Check to verify that the fan is disengaged (not turning)<br />
with the engine running at normal operating temperatures<br />
(from cold to the point that the fan engages).<br />
• Check fan blade mounting bolts. Inspect fan blades to be<br />
sure they are not cracked or bent. If problems exist, refer<br />
to the Cooling System section in the <strong>Medium</strong> <strong>Duty</strong><br />
Maintenance <strong>Manual</strong> for detailed maintenance instructions.<br />
<strong>Medium</strong> <strong>Duty</strong> (R05/09) Y53-6027 – 259 –
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