Checking all cylinders for loss of pressure (B36 engine) (Cooper base)

Special tools required: 

• 11 6 480
• 2 302 630

Attention! 

Risk of damage to engine.

Rotate the engine, by hand only, in the correct direction of rotation  (clockwise) while keeping an eye on the vibration damper.

Preliminary work needed: 

• Remove the SPARK PLUGS .
• Remove FRONT RIGHT WHEEL ARCH PANEL .

Have the adapter for the spark plug thread (60) (1) ready.

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Screw in the adapter for the spark plug thread (60) (1) into the spark plug thread by hand.

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Tighten the adapter for the spark plug thread (60) (1) with a standard tool (2).

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Connect the OT finder (1) to the adapter for the spark plug thread (60) (2).

The OT finder (1) must engage audibly.

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Position the special tool 11 6 480.

Attention! 

Risk of damage to engine.

If the engine is rotated by hand, the engine can be damaged  .

Rotate the engine, by hand only, in the correct direction of rotation  , clockwise, while keeping an eye on the vibration damper.

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Turn the engine by hand with the special tool 11 6 480.

If the piston travels upward, the bubble level (2) also travels upward in the arrow direction  inside the cylinder tube (1).

The top dead center  is the location of both the piston and the bubble level (2) in the cylinder tube (1) at the highest point.

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Preparations for calibrating or adjusting the special tool 2 302 630. 

Connect the quick-release coupling (1) in the arrow direction  on the valve block (2) of the pressure gauge.

The quick-release coupling (1) must engage audibly.

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Connect the pressure hose (1) in the arrow direction  on the valve block (2) of the pressure gauge.

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Unlock the pressure control valve (1) in the arrow direction  .

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Rotate the pressure control valve (1) in the arrow direction  until the needle (2) of the pressure gauge is pointing to 22 %  .

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Lock the pressure control valve (1) in the arrow direction  .

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Unlock and release the quick-release coupling (2) in the arrow direction  on the valve block of the pressure gauge (2).

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Check all cylinders for loss of pressure using the special tool 2 302 630. 

Attention! 

The description is provided only at one cylinder  .

The procedure is the same for all other cylinders  .

Connect the quick-release coupling (1) of the pressure gauge to the adapter for the spark plug thread (60) (2) and lock it.

The quick-release coupling (1) of the pressure gauge must engage audibly.

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Read off the loss of pressure. The needle (1) of the pressure gauge must be positioned within the green area  of 0-22 %.

Losses of pressure less than 22 % are to be viewed as OK  values.

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Read off the loss of pressure. The needle (1) of the pressure gauge must be positioned within the green area  of 0-22 %.

If the loss of pressure is greater  than 22 %:

Possible fault causes: 

Determine leak of the piston rings (crankcase ventilation).

Determine leak of the intake valves (intake port).

Determine leak of the exhaust valves (exhaust system).

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Required follow-up work: 

• Install the SPARK PLUG .
• Install FRONT RIGHT WHEEL ARCH PANEL .