Description of defect

In some engines, the mounting bolts for the water pump drive pulley are not sufficiently tightened, and abnormal noise may be heard in the engine compartment during use.

Improvement details

Inspect the tightness of the pulley mounting bolts and, if insufficient, tighten them to the specified torque.

Chassis number of target vehicles

Lancer Evolution VII

CT9A-0000231～CT9A-0000742

Automotive maintenance cannot determine the cause based on symptoms alone.
Be sure to perform diagnosis and inspection before determining the cause of the failure.