Observable Diagnostics and Tests
04
150
21
DPSG,RG40854,286 –19–07NOV00–1/1
Check for Intake Air Leaks
T5906AP –UN–23FEB89
Air Filter
RG10664 –UN–14DEC99
Intake Plug
A—Intake Plug
Loose connections or cracks in the suction side of the air
intake pipe can allow debris to be ingested into the engine
causing rapid wear in the cylinders. Additionally, on
turbocharged engines, compressor damage may occur
and cause an imbalance resulting in bearing failure. Air
leaking form loose connections or cracks on the pressure
side of the turbocharger can cause excessive smoke and
low power.
NOTE: The following test procedure requires that the air
intake be sealed off to pressurize the system.
Using a plastic bag to seal the intake air filter is
used as an example.
CAUTION: Do not start engine during this test
procedure. Plastic bag (or whatever
material/object is used to seal intake) can be
sucked into the engine.
1. Remove air cleaner cover and main filter element.
2. Put a plastic bag over secondary filter element and
install main element cover.
3. Remove plug from manifold and using a suitable
adapter, connect a regulated air source.
4. Pressurize air intake system to the following
specification.
Specification
Intake Manifold—Test Pressure 13.8—20.8 kPa (0.13—0.21 bar)
(2—3 psi)
.............
5. Spray soap and water solution over all connections
from the air cleaner to the turbocharger or air inlet to
check for leaks. Repair all leaks.
6. Remove plastic bag from filter element and reinstall
element and cover.
CTM100 (06APR04)
04-150-21
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=369
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