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Remove/install coolant pump - AR20.10-P-1271CD

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ENGINE 651 in MODEL 166, 172, 204, 207, 212 (except 212.098/298), 218, 221 

Fig 1: Coolant Pump Remove/Install Components
G09975325Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A
DANGER Risk of injury  to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning  from swallowing coolant. Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.
AS20.00-Z-0001-01A
1 Drain coolant at radiator MODEL 166 with ENGINE 651 AR20.00-P-1142GQ
MODEL 172, 204, 207 with ENGINE 651 AR20.00-P-1142CW
MODEL 212 (except 212.098/298), 218, 221 with ENGINE 651 AR20.00-P-1142OMA 
2 Remove cylinder head cover trim    
3 Detach cover for upper belt drive to the front and remove upwards    
4 Remove poly-V belt MODEL 166 with ENGINE 651 AR13.20-P-0001GQA
MODEL 204 (except 204.9) with ENGINE 651 AR13.20-P-0001CD
MODEL 204.9 with ENGINE 651 AR13.20-P-0001OMD
MODEL 172, 207, 212 (except 212.098/298), 218, 221 with ENGINE 651 AR13.20-P-0001OMA
5 Disconnect coolant hoses (1, 7) from coolant pump (9)   AR09.41-P-1311-01AL
INSTALLATION IMPORTANT Check condition of the coolant hoses (1, 7) and hose couplings and check seat; replace coolant hoses (1, 7) or catch springs for the hose couplings if necessary.  
6 Disconnect coolant hose (14) from coolant pump (9) INSTALLATION IMPORTANT Check coolant hose (14) and hose clamp for good condition; replace if necessary.  
SPECIAL TOOL Hose clamp pliers Fig 2
7 Remove screw/bolt (2) and guide pulley (3) TORQUE SPECIFICATION Bolt, guide pulley to major assembly carrier *BA13.25-P-1002-01W 
8 Unscrew screw/bolts (4) and remove bracket TORQUE SPECIFICATION Bolt, coolant manifold bracket to coolant manifold *BA20.10-P-1003-01X 
TORQUE SPECIFICATION Bolt, coolant manifold bracket to major assembly carrier *BA20.10-P-1004-01X 
9 Detach vacuum hose (6)    
10 Detach line bracket (10) from coolant pump (9) INSTALLATION IMPORTANT Attach line bracket (10) to the same position.  
11 Remove screw/bolts (8) and remove coolant pump (9) IMPORTANT Pull linkage for the turbocharger bypass flap (5) downwards (arrow) for improved disassembly of the coolant pump (9).
INSTALLATION IMPORTANT Clean sealing surfaces and replace seal (13).
 
TORQUE SPECIFICATION Bolt, coolant pump to cylinder crankcase *BA20.10-P-1002-01X 
12 Remove screw/bolts (11) and remove coolant manifold (12) Only when replacing coolant pump (9) or coolant manifold (12).
INSTALLATION IMPORTANT Replace O-ring.
 
TORQUE SPECIFICATION Bolt, coolant manifold to coolant pump *BA20.10-P-1007-01X 
13 Install in the reverse order    
14 Check engine cooling system for leaktightness MODEL 166.0 with ENGINE 651 AR20.00-P-1010GQ
MODEL 172, 204, 207 with ENGINE 651 AR20.00-P-1010CW
MODEL 212 (except 212.098/298), 218 with ENGINE 651 AR20.00-P-1010OMA 
MODEL 221 with ENGINE 651 AR20.00-P-1010SX
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 651
BA20.10-P-1003-01X Bolt, coolant manifold bracket to coolant manifold Nm 9
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 651
BA20.10-P-1007-01X Bolt, coolant manifold to coolant pump Nm 9
BELT TENSIONING DEVICE

Number Designation ENGINE 651 (except 651.901/930)
BA13.25-P-1002-01W Bolt, guide pulley to major assembly carrier M8 Nm 25
M10 Nm 45
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 651
BA20.10-P-1004-01X Bolt, coolant manifold bracket to major assembly carrier Nm 9
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 651
BA20.10-P-1002-01X Bolt, coolant pump to cylinder crankcase Nm 20
Fig 2: Identifying Hose Clamp Pliers (003 589 03 37 00)
G09975326Courtesy of MERCEDES-BENZ USA