Inspecting the Pre-EPA07 Exhaust System
cen mm 49.01.000
In addition to inspecting the exhaust system at the scheduled maintenance interval, inspect the exhaust system if the noise level of the vehicle has increased. Replace parts that show leakage, wear, or damage, with genuine Freightliner parts.
- On all vehicles, check the condition of the muffler body,
the top stack, and the heat shield. See Fig.. Check the
inlet/outlet tubes for leakage, dents, and corrosion, and check for
holes in the muffler. Replace parts as required. Use new parts, equivalent
to parts originally installed on the vehicle. See of the Century Class Trucks Workshop Manual for replacement
procedures.
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Exhaust Clamp
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Lower Heat Shield Fastener
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Upper Heat Shield Fastener
Fig. 1, Vertical Exhaust Stack and Heat Shield
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- Inspect the exhaust flex hose (see Fig.)
for leakage, wear, or damage. Replace with new parts if replacement
is needed.
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Flex Hose
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V-Band Coupling
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Exhaust Pipe
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Turbocharger Exhaust Outlet
Fig. 2, V-Band Coupling and Flex Hose
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- Check for leakage at the V-band coupling, which attaches
the exhaust pipe to the turbocharger exhaust outlet. See Fig..If leakage exists, tighten the nut on the V-band coupling 10 lbf·ft (14 N·m). If leakage persists, install a new V-band coupling.
- Inspect the turbo outlet pipe, and replace it as needed.
- Check the U-bolt clamps for tightness, and tighten as needed.
- Check the isolator at the base of the exhaust stack elbow(s)
(see Fig.), for cracking, damage, and
dry rot. Replace as needed.
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Exhaust Pipe
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Exhaust Elbow Isolator
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Mounting Nut
Fig. 3, Exhaust Elbow Isolator
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- Check for leakage at all wide-band exhaust clamps. See
Fig., Fig., or Fig..If leakage exists, tighten the nuts 40 to 60 lbf·ft (54 to 81 N·m). If leakage persists, install a new wide-band exhaust clamp. Do not re-use Sealclamps.
Fig. 4, Donaldson Sealclamp Wide-Band Exhaust Clamp
Fig. 5, Torca Torctite Wide-Band Exhaust Clamp
Fig. 6, Gemi Wide-Band Exhaust Clamp
Note: