Removing and installing coolant pump - RA20001202100X(20-2100)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Preceding work:
Radiator removed (20-4200) .
Coolant temperature thermostat housing (4) removed (20-1120) .
| Bolts (24) and (22) of belt pulleys | slacken, tighten (step 1). |
| Poly V-belt (29) | remove, install (13-3420) . |
| Viscous fan coupling belt pulley (21) and coolant pump belt pulley (23) | remove, install (step 3). |
| Guide pulley (25) | remove, install (13-3460) . |
| Coolant hose (15) | detach, attach. |
| Coolant pump bolts (27) | unscrew, screw on (step 6). |
| Coolant pump (26) with gasket (28) | remove, install. |
| Sealing surfaces | clean. |
| Gasket (28) | replace. |
| Cooling system | check for leaks Testing cooling system for leaks . |
TIGHTENING TORQUES IN NM
| M6 bolts of viscous fan and coolant pump belt pulleys | 10 |
| M8 bolts of coolant pump | 21 |
Special tool
Removing, installing
- Slacken bolts (arrows) of viscous fan coupling belt pulley (21) and of coolant pump belt pullley (23).
Tightening torque 10 Nm.
- Remove poly V-belt (13-3420) .
- Unscrew fan belt pulley (21) and coolant pump pulley (23), remove.
- Remove guide pulley (25) at front right cover (13-3460) .
- Detach coolant hose at bottom of coolant pump.
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
- Unscrew coolant pump (26) and take off to the front.
Installation note
Model 129: lead ignition cable 4 past behind coolant pump (26).
Model 140: lead cable of TDC sensor (L1/2) past behind coolant pump (26).
Install screws and bolts according to diagram.
Tightening torque 21 Nm.
- Clean sealing surfaces.
- Replace gasket of coolant pump.
- Install in the reverse order.
- Check cooling system for leaks Testing cooling system for leaks .