* When replacing a water pump, it is necessary to drain the cooling system.
* Any components--belts, fan, fan shroud, shaft spacers, or viscous drive clutch--should be removed to make the pump accessible. Some pumps are attached to the cylinder block as shown below.
Installing a water pump.
* Loosen and remove the bolts in a crisscross pattern from the center outward.
* Insert a rag into the block opening and scrape off any remains of the old gasket.
WARNING
When working on the coolant system (for example, replacing the water pump or thermostat), a certain amount of coolant will spill on the floor. The antifreeze in the coolant causes it to be very slippery. Always immediately wipe up any coolant that spills to reduce or eliminate the chance of injury.
* When replacing a water pump, always follow the procedures recommended by the manufacturer.
* Most often a coating of good waterproof sealer should be applied to a new gasket before it is placed into position on the water pump.
* Coat the other side of the gasket with sealer, and position the pump against the engine block until it is properly seated.
* Install the mounting bolts and tighten them evenly in a staggered sequence to the torque specifications with a torque wrench. Careless tightening could cause the pump housing to crack. Check the pump to make sure it rotates freely.
* The water pumps on many late-model OHC engines are driven by the engine's timing belt. When replacing the water pump on these engines, always replace the timing belt.
* Make sure all pulleys and gears are aligned according to specifications when installing the belt.
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I would take it to a mechanic water pump is behind timing cover
The water pump is driven by the cambelt and requires you stripping off the cambelt etc to get to the pump. you will need to replace Hydrlic tensioner when doing this even if the cambelt is has been done recently
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