Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

PART 8: MAINTENANCE AND SERVICE
Inspection & Maintenance Instructions for Noise Control System
Diesel Particulate Filter (DPF)
Use only an exact replacement DPF in exhaust systems.
Using a noncompliant DPF as a replacement could violate
these standards and also void the emission system’s warranty.
NOTE: Check the DPF for looseness.
loose mounting bolts as necessary.
Exhaust Tail Pipe(s)
Tighten
Check the mounting security. Tighten as necessary. The
miter cut at the tip of the pipe must be facing the rear of the
truck. Do not modify the end of the pipe in any way..
Fan Shroud
WARNING! The engine fan can engage at any
time without warning. Anyone near the fan
when it turns on could be badly injured. Before
turning on the ignition, be sure that no one is
near the fan. Do not work on the fan with the
engine running.
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.
Engine Mounted Noise Insulators
Fasteners
Check for condition and security. How you do this will depend
on the method of attaching the noise insulators on
the engine and around the oil pan (bolts, snap fasteners,
or straps). Tighten loose fasteners; repair or replace any
worn or damaged fasteners.
Insulators
Check insulators around fasteners and stress points, especially
where they may be affected by engine vibration.
Repair any cracked or damaged mounting points. Use suitable
reinforcing plates to ensure that the insulators will remain
in position.
Inner Fender Shields and Cab Skirts
Fasteners
Check all fasteners for security, especially the self-tapping
hex head screws. Remove and replace any loose rivets.
R(08/07) Y53-6015 – 193 –