Component Tests and General Diagnostics

17 00 009 - Checking cooling system for water leaks





Special tools required:
- 00 2 030 00 2 030 Universal Hydro-Lifter Basic Unit
- 17 0 101 17 0 100 Tester
- 17 0 113 17 0 100 Tester
- 17 0 114 17 0 100 Tester





Warning!
Danger of scalding!

Only perform this work after engine has cooled down.





Protective measures/rules of conduct:

- Wear protective goggles
- Wear protective gloves
- Observe national/country-specific regulations





Important!
Risk of slipping due to coolant on the floor.

Danger of injury!

Catch and dispose of drained coolant in drip tray (1) and if necessary special tool 00 2 030 00 2 030 Universal Hydro-Lifter Basic Unit (universal hydraulic lifter).

Recycling:
Observe country-specific waste-disposal regulations.





Note:
Illustrations show M54:

Checking pressure drop in cooling system:

Open cap on coolant expansion tank. Fit special tools 17 0 101 17 0 100 Tester/ 17 0 113 17 0 100 Tester.

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

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





Checking pressure relief valve in cap:

Note:
Coolant residue can cause the pressure relief valve in the cap to stick, therefore repeat the check procedure on the cap 2-3 times.





Screw cap (1) onto special tool 17 0 114 17 0 100 Tester.

Build up pressure with special tool 17 0 101 17 0 100 Tester (hand pump); observe pressure gauge to ascertain when opening pressure is achieved.

Opening pressure of pressure relief valve.