What part is attached at the back to the power steering pump because it leaks water inbetween there .Its a BMW 318i 2002 E46 N42 Motor.There are no screws that can be removed to fix it.

SOURCE: 2001 bmw whining power steering pump

check to see if the belt that drives the pupm is tight.

SOURCE: water leaking bad from front of motor.

freeze plugs will be located towards bottom of the engine. It could be the water pump, or a bad hose.

SOURCE: bmw e46 2000 model 'how to remove water pump?'

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SOURCE: How do I remove xenon headlight unit on bmw e46

Just a thought, behind the front bumper are the securing hardware. Bumper needs to be removed so you can access the fasteners.

SOURCE: bmw n42 oil pump

the m42 oil pump is located inside the timing chain cover and is an integral part of the casing so it is neccessary to remove the water pump + viscous fan etc to expose the pump front cover then remove 4 machine screws to examine the pump rotors underneath.