Air Intake and Exhaust System Operation and Tests
TURBOCHARGER OIL SEAL LEAK TEST
Seals are used on both sides of the turbocharger rotor
assembly. The seals are used to prevent exhaust gasses
and air from entering the turbocharger housing. Oil
leakage past the seals is uncommon but can occur.
A restricted or damaged turbocharger oil return line can
cause the housing to pressurize causing oil to leak by the
seals. Additionally, intake or exhaust restrictions can
turbocharger housing causing oil to leak by the seals.
1. Remove exhaust pipe (shown removed) and crossover
B--Oil Return Line
2. Inspect the turbine casing and crossover tube for
evidence of oil leakage.
If oil leakage is present, perform the following:
Inspect turbocharger oil return line (B) for kinks or
damage. Replace if necessary.
Check the air intake filter, hoses, and crossover tube
Check the exhaust system for restrictions to include
position of exhaust outlet.
3. Perform necessary repairs and repeat test.