17 00 009 Checking cooling system for leaks (M54)

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Special tools required:

17 0 101
17 0 105
17 0 106

WARNING: Danger of scalding!
Only perform this work after engine has cooled down.

NOTE: Illustrations feature the E85.

Checking pressure drop in cooling system:

Open cap on coolant expansion tank. Fit special tools 17 0 101 / 17 0 105.

Build up gauge pressure of 1.5 bar, wait approx. 2 minutes.

Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.

Fig 1: Checking Cooling System Pressure Drop

Courtesy of BMW OF NORTH AMERICA, INC.

Checking pressure relief valve in cap:

Screw cap (1) onto special tool 17 0 106.

Build up pressure with special tool (hand pump) 17 0 101; observe pressure gauge to ascertain when opening pressure is achieved.

Compare opening pressure of pressure relief valve. See COOLING SYSTEM - TECHNICAL DATA .

Fig 2: Installing Cap Onto Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.