Removal and installation of coolant pump housing
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20—230 Removal and installation of coolant pump housing
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Tightening torques
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Nm
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Model 116
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6-10
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Radiator drain plug
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Model 123, 126
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1.5-21)
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Coolant pump housing to cylinder crankcase
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27-33
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Viscofan coupling to coolant pump
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20-25
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l) This torque can be obtained by means of a washer or a coin.
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Special tools
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Tester for cooling system
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001 589 48 21 00
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Radiator cap with hose for leak test
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605 589 00 25 00
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Socket 27 mm, 1/2″ square
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001 589 65 09 00
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7 mm socket on flexible shaft for hose clamps with worm drive
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123 589 12 09 00
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Removal
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1 Completely drain coolant (20-010).
2 Remove radiator (20-420).
3 Remove fan with viscofan coupling.
4 Slacken all V-belts and remove (13-340).
5 Remove coolant pump pulley.
6 Remove crankshaft pulley and vibration damper (03-340).
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Drain plug on cylinder crankcase
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20.8-230/1 F 2
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7 Disconnect hot water return hose on coolant pump housing.
8 Disconnect hose between coolant thermostat housing and coolant pump housing.
9 Rotate crankshaft with tool combination until the recess in balancing disk is in front of lower fastening screw of coolant pump housing (arrow).
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1100-6438,1
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10 Unscrew vent line on coolant pump housing (arrow).
11 Unscrew coolant pump housing and remove together with coolant pump.
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Installation
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12 Install coolant pump housing with new gasket and tighten fastening screws to 27—33 Nm.
13 For further installation proceed vice versa to removal.
14 Add coolant (20-010).
15 Pressure-test cooling system with tester (approx. 1 bar gage pressure).
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20.8-230/2 F 2
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