TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Exhaust Restriction (011-009)
Section 11 - Exhaust System - Group 11
Page 11-9
Operate the engine, and check for leaks.
Exhaust Restriction (011-009)
Measure (011-009-010)
Pressure Gauge, Part No. ST-1273
Install pressure gauge, Part No. ST-1273, to the pressure
tap in the exhaust head pipe or at the inlet to the catalyst/
muffler assembly.
Operate the engine at rated speed and load. Record the
exhaust restriction.
If restriction exceeds specification, inspect the oxidation
catalyst and/or muffler and replace according to the vehicle
manufacturer's instructions.
Exhaust Restriction
mm Hg
in Hg
Industrial
76
MAX
3
1991 EPA Certifica-
114
MAX
4.5
tion
1994 EPA Certifica-
152
MAX
6
tion with Oxidation
Catalyst
L-1201