49-01 Exhaust System
Inspecting (Noise
Emission Controls)
NOTE: In addition to the maintenance interval in
this manual, inspect the exhaust system if the
vehicle has a noticeable increase in noise level
at any time. Replace parts that show leakage,
wear, or damage.
1. Check the muffler body, muffler outlet stack, muf-
fler shield, and inlet tubes, for leakage, dents,
corrosion, or holes in the muffler.
2. Inspect the exhaust pipe for leakage, wear, or
damage; replace with new parts, if needed. Do
not reuse wide-band clamps. Once a clamp is
removed, it must be replaced.
2.1 On Caterpillar, Cummins, and Detroit Die-
sel engines, check for leakage at the
V-type clamp that attaches the exhaust
pipe to the turbocharger exhaust outlet. If
leakage exists, tighten the nut on the
V-type clamp 85 lbf·in (940 N·cm). If leak-
age persists, install a new V-band cou-
pling.
2.2 On Mercedes-Benz OM 366LA and
Dodge Magnum engines, check the tight-
ness of the fasteners that attach the ex-
haust pipe to the exhaust flange (Fig. 1).
If needed, tighten the fasteners 33 lbf·ft
(45 N·m) for Mercedes-Benz OM 366LA
engines. For Dodge Magnum engines,
tighten the fasteners 25 lbf·ft (34 N·m).
3. Check for leakage at each wide-band exhaust
clamp (Fig. 2). 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. See
Group 49 of the
Business Class
®
Trucks Service
Manual
for procedures.
f490032a
10/05/94
A
A. Check the Tightness of These Fasteners
Fig. 1, Typical Exhaust-Pipe to Exhaust-Flange
Fasteners, OM 366 Engine Shown
f490005a
10/05/94
Fig. 2, Wide-Band Exhaust Clamp
Exhaust 49
Business Class Trucks Maintenance Manual, October 1998 49/1
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