Air Intake and Exhaust System Operation and Tests
INTAKE AIR LEAK TEST
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
and cause an imbalance resulting in bearing failure.
Air leaking from 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 air intake filter is
used as an example.
CAUTION: Do not start engine during this test
procedure. Plastic bag (or whatever
material/object 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 and cover.
A--Start Aid Line
3. Remove plug (B) from manifold or disconnect line (A)
from crossover tube if (equipped) and using suitable
adapter, connect a regulated air source.
4. Pressurize air intake system to 13.8--20.7 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.