Engine - Knocking Noise From Engine Compartment

SI M 11 02 08
Engine

July 2008
Technical Service

SUBJECT
Knocking Noise from Vacuum Pump

MODEL
R55 (Cooper Clubman S) with N14 engine

R56 (Cooper S) with N14 engine

SITUATION
The customer complains of a knocking noise from the engine compartment. The noise is considerably louder when the engine hood is opened.

CAUSE
The mechanical vacuum pump creates a knocking noise when in operation. The noise should be considered normal.

PROCEDURE
To verify the source of the noise, disconnect the vacuum hose from the mechanical vacuum pump; this eliminates the knocking noise of the pump.

This is not a failure of the mechanical vacuum pump, but rather the component's characteristic. Do not replace any parts.

WARRANTY INFORMATION
Information only





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