MWM Acteon, Workshop Manual

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Intake, Exhaust and Turbocharger System
9.612.0.006.7160 - 05/04
Disassembly Notes
4.12TCE and 6.12TCE Engines: During turbocharger
disassembly, pay attention to do not loosen the waste-
gate adjustment nut.
During the disassembly of the exhaust tripartite
manifold, the crusts of coal must be removed from
the rings and sealing seats between manifolds.
To loosen the manifolds bolts use the tool MWM nr.
9.612.0.690.002.4.
Cautions
• Wait the engine to cool down to perform any service. Exhaust manifold and turbocharger
reach very high temperatures and offer burns risk.
• Never perform service on any component of the system while the engine is running.
• Do not inspect the exhaust system with the engine in operation inside rooms without
appropriate ventilation, because exhaust gases are extremely toxic.
Inspections
Check the general condition of the turbo blades. The
contamination of the intake air can cause premature
waste of the rotor. Check if there are oil leakages
through the sealing rings of the rotor shaft. To check
for leakages, visually check the gases outlet in the
turbine carcass and the air outlet in the compressor
carcass.
Check for contact marks between rotors and
carcasses. If any irregularity is detected, take the
turbocharger to an authorized service station of the
turbo manufacturer. Any violation of this component
causes the cancellation of the warranty.
Test the waste-gate system. Disconnect the waste-
gate pipe and with compressed air apply 1 bar pressure
to the waste-gate. The valve is correctly operating if it
can be detected the movement of the stem.