Modifying Existing Pump; Bleeding The Ewp; Best Orientation; Incorrect Orientation - Davies Craig EWP-FAN Installation Instructions Manual

MODIFYING EXISTING PUMP

To modify the existing pump, please do either:
1. Remove the existing belt driven water pump.
2. Pull the pump impeller off the belt driven pump shaft. (NOTE: You may need to drill holes through the
impeller close to the drive shaft to make it easier to remove.) Be careful not to damage the seal or bearing
when removing the impeller. Alternatively, remove vanes from impeller in situ.
3. Re-fit the belt driven water pump housing without the impeller ensuring that there is no damage to the water
pump gasket and the pump seal is still retained. Re-fit the water pump belt and tighten to manufacturer‟s
specifications.
Or:
By-pass the belt-drive on the water-pump, if possible, by installing a shorter belt that omits the pump
pulley. This option is not possible if the pulley drives a belt-driven fan unless you replace the fan with a
Davies, Craig Thermatic Fan
BEFORE
Alternator
Pulley
Fig.8

BLEEDING THE EWP

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Ensure the EWP is orientated correctly as shown below before continuing and hose clamps are tight.
NOTE: This orientation is a temporary requirement for the purpose of bleeding the pump and ensuring there
is no air entrapped within the seal housing of the pump. The pump can be set-up in another orientation upon
completion of the bleeding procedure.
FIGURE 9a: BEST ORIENTATION
1. Fill up the cooling system with appropriate coolant.
2. Do not run the engine but temporarily hardwire the pump direct to the battery so that the pump runs at
full power.
3. With the radiator cap off, run the pump for 5 - 10 minutes to ensure that there is no air trapped in the
cooling system. Fill with coolant as the air is removed from the system.
4. Once all air is removed from the cooling system replace the radiator cap and reconnect the pump to your
original controlling method.
NOTE: Slightly loosening the hose clamps and rotating pump to desired position can change the pump
orientation. If leakage occurs from hoses during re-positioning, the coolant level must be topped up.
Ensure that hose clamps are tight.
®
. For example:
Water Pump
Pulley
Cra Crank
®
INLET
AFTER
Alternator
Pulley
AIR POCKET
FIGURE 9b: INCORRECT ORIENTATION
Water Pump
Pulley
Crank
INLET
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