NOISE CONTROL SYSTEM PART 8: MAINTENANCE AND SERVICE
– 202 – Y53-6007 (R10/06)
Check clamps and mounting brackets for security. Check
internal baffling for security. You can do this by listening for
rattling sounds while tapping the muffler with a rubber
mallet or revving the engine up and down through its nor
-
mal operating range. Check muffler for rust and corrosion.
Exhaust Tail Pipe(s)
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 run
-
ning.
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.
Hood Insulation Blanket
Fasteners
Check all fasteners for condition and security. Repair or
replace any broken or defective fasteners.
Blanket
Check for chafing, tears, etc. Patch it if necessary. Find
the cause of the damage. If any component or accessory
is causing wear or damage and can’t be relocated, put
reinforcing pads on the blanket at the site of wear.
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.
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