B3.9 and B5.9 Series Engines
Section 10 - Air Intake System - Group 10
Before removing the turbocharger, make sure the noise
complaint is not caused by leaks in the air system com-
Check for loose turbocharger mounting, exhaust manifold
gasket leaks, and cracks in the exhaust manifold.
Lower pitched sounds or rattles at slower engine speeds
can indicate that debris in the system or the rotor assembly
is touching the housings.
Remove the air crossover tube, if used.
Disconnect the charge air cooler hose.
Disconnect the boost capsule actuator hose.
Disconnect and remove the exhaust and intake air piping.
16 mm and 19 mm
Remove the turbocharger lubricating oil supply line from
the turbocharger and oil filter head.
NOTE: Engines built after June 1993 can use a copper
washer in both ends of the turbocharger lubricating oil
supply line. The washer should be replaced whenever the
line is removed.