Engine - Vacuum Pump Knocking Noises (Normal)

SI M 11 02 08
Engine

April 2009
Technical Service

This Service Information bulletin supersedes SI M11 02 08 dated July 2008.

[NEW] designates changes to this revision

SUBJECT
Knocking Noise from Vacuum Pump

MODEL
R55 (Cooper Clubman S) with [NEW] N12 and N14 engine
R56 (Cooper S) with [NEW] N12 and N14 engine
[NEW] R57 (Cooper Convertible and Cooper S Convertible) with N12 and 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