How to fix a power steering pump
The power steering pump in my wifes mini packed in, I couldn't believe the the price of a new item so I thought I could have a look inside.
I am a qualified electronics engineer with a motorcycle parts business.
So here in steps is how to dismantle it, this isn't ment for novices but mechanics or other engineers.
Remove the pump from the car
Remove the fitting brackets and fluid pump from the end of the motor.
Remove the screws holding the motor body together and seperate.
I had to drift out the shaft from the brushes section.
So why did you motor fail, well the motor is fitted with carbon brushes,
over time the carbon brushes wear, the carbon then flies about inside.
The motor is fitted with a computer system, (lots of chips) the carbon dust settles on the chips (which should be sealed with a laquer but arn't).
The carbon is a conductor so it totaly screws up the computer, as dust it is also a poor conductor so tends to disrupt the operation rather than totaly destroying them.
all you have to do is wash the carbon off the chips with a little brake cleaner and allow to dry. I removed the brush assembly but to do this you have to cut the link coils between the computer at the rear of the motor with the brushes. When refitting these need to be resoldered onto the original positions, these are originaly spot welded.
Now that I know what the fault problem is, it may be possible to just spray the brake cleaner through one of the holes on the brush mounting plate, but you risk not removing all the carbon, too little fluid and you leave carbon, too much fluid and you risk drying out the end bearing.
If anyone would like some photo's of the job, let me know.
6 months on, the motor is faultless.
Last edited by pulsey; Feb 3rd, 2010 at 10:07 PM.
Reason: typo error