HX25/25W/27W Service Repair Manual Troubleshooting and Diagnosis
Fault Finding chart - Wastegate Applications
3:2
Engine Lacks Power
Black Exhaust Smoke
Blue Exhaust Smoke
High Oil Consumption
Turbocharger Noisy
Engine Running Hot
Poor Transient Response
Smoke
Cyclic Sound from the Turbocharger
Oil Leak from Compressor Seal
Oil Leak from Turbine Seal
Failed actuator diaphragm
Replace using correct Actuator Service Kit
Seized wastegate valve (in turbine housing)
Free valve in accordance with details in the appropriate Holset publication replace complete
turbine housing sub-assembly
Leaking actuator hose
Replace hose and clips
Wastegate mechanism set incorrectly
Contact your approved Holset agent for correct setting procedure
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