Water Pump: Service and Repair

Removing coolant pump (engine installed) - GT3





Tools





Removal overview of the coolant pump (engine installed) - GT3





Preliminary work:
Disassemble the accessories of the rear spoiler (contains: rear end, bottom centre heat shield and bumpers).

Removing coolant pump - GT3





1. Drain coolant
Undo the drain plugs on the two necks for coolant and collect coolant. After draining the coolant, fit new sealing rings on the drain plug. Tightening torque 10 Nm (7.5 ft. lbs.) to 15 Nm (11 ft. lbs.). (Figure shows only one of the two necks)
2. Remove coolant hose
Pull off the coolant hose between the coolant expansion tank and coolant pump on the pump neck. Undo spring-band clamps with the commercially available pliers No. 72 or 73.





3. Remove air cleaner assembly
Remove air cleaner assembly completely. Undo fastening screw M6 x 34. Pull off cable from hot film mass air flow sensor and set aside. Undo the hose clamp on the throttle body. Take out air cleaner assembly.





4. Remove drive belt
Slacken belt by turning the tensioning pulley (wrench size 24 mm) clockwise, hold still and simultaneously take the belt off the drive pulleys and set aside.





5. Remove catalytic converter of cylinder bank 1 - 3
Undo the catalytic converter of cylinder bank 1 - 3 at the exhaust manifold. Unplug oxygen sensor cable and unclip. Remove the holding clamp between the catalytic converter and support sheet and undo the two exhaust clamps. Take catalytic converter off of the exhaust manifold, pull out of end muffler.





6. Secure catalytic converter
Turn the catalytic converter and tie in place as shown in the illustration. Cover body to protect from damage.





7. Loosen coolant pump
Undo the seven Torx screws on the coolant pump with a T30 wrench. Observe the different lengths of the screws. The two lighter screws are longer.





8. Remove coolant pump
Lift off coolant pump and pull out towards the rear through the opening in the support plate. The coolant pump must be slightly tilted to do this. The impeller must not be damaged during this procedure.





Installing coolant pump (engine installed) - GT3





Tools











Installation overview of the coolant pump (engine installed) - GT3

Installing coolant pump - GT3





1. Insert new metal seal
Remove old seal carefully, clean and degrease the sealing surfaces. Insert new metal seal for coolant pump and water guide housing.





2. Mount coolant pump
Put on the coolant pump carefully through the support plate. The impeller and the seal must not be damaged during this procedure.





3. Install coolant pump
Position new seal and coolant pump simultaneously and fasten. Observe the different screw lengths. Tighten screws in diagonally opposite sequence. Tightening torque: 10 Nm (7.5 ft. lbs.)





4. Push on coolant hose
Push on the coolant hose between the coolant expansion tank and coolant pump on the pump neck. Fasten spring-band clamp with the commercially available pliers No. 72 or 73.





5. Install catalytic converter
Install the catalytic converter of cylinder bank 1 - 3 with a new manifold seal. Screw holding clamp and exhaust clamps into horizontal position if possible. Use new nuts on the exhaust manifold. Push on and clip in oxygen sensor cable.





6. Fit and tension the drive belt
Fit the drive belt in the old running direction on all belt pulleys and tension. Observe the order for fitting. It is absolutely necessary to check that the drive belt is correctly seated on all belt pulleys.





7. Install air cleaner assembly.
Place the air cleaner assembly in the engine compartment again. Tighten the hose clamp on the throttle body. Tighten fastening screw M6 x 34. Fix cable onto hot film mass air flow sensor.
8. Fit rear spoiler
Fit the accessories of the rear spoiler (contains: rear end, bottom centre heat shield and bumpers).
9. Fill in coolant
Fill coolant into coolant expansion tank.