Question about 1992 Cadillac DeVille
It has a 4.8l northstar engine and would like to know the easiest way to remove and replace it. one more thing. the water pump is on its own separate pulley system on the driver side of the car please help thanks
First of all,you need the removal tool which looks like this.
You need to remove the air filter housing and ducting to gain easy access to the pump.
Remove the shield covering the pulley and belt. The belt is easily removed by levering the tensioner pulley.
The water pump is located at the lower radiator hose manifold where you will also find the thermostat.Remove the manifold cover and you will see the water pump.
Insert the removal tool over the pump making sure it is locked in position.You will need to use a breaker bar on the removal tool and turn the tool CLOCKWISE to release the pump (1/4 turn), or if you imagine the breaker bar being vertical, push towards the windscreen of your car,it takes quite a bit of force to unseat the pump hence the use of a breaker bar.
Installing the new pump does not require as much torque as removing the old one.Tighten the new pump to 73 ft.lbs. making sure it is seated properly before tightening.
Don't forget to clean out the water pump housing prior to installing the new pump and don't forget to include a new water pump gasket and housing cover gasket.
It is also a good idea to install a new thermostat while you're at it.
Just as an aside, the Northstar is a 4.6 , not 4.8.
Posted on Sep 06, 2009
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Posted on Jan 02, 2017
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Fig. Water pump assembly-4.6L Northstar engine (click image for zoom)
Fig. Remove the water pump belt shield
Fig. Remove the water pump adjuster pulley retaining bolt and
Fig. Remove the water pump retaining bolts
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