Easy 1-person PS Fluid Change DIY

[Jeremy5848]

Here is a trick to turn the changing of power steering fluid into an easy 1-person job. No more frantic pouring of fluid into the reservoir, trying desperately to keep up with the pump while an assistant turns the steering wheel from side to side. This should work on all PS pumps -- I would like to hear from people whose efforts are in vain.

The procedure is mostly what you've already come to know and hate -- drain the reservoir with the turkey baster, then buy your wife a new one. Remove the filter if there is one. Disconnect the return line and direct it into a drain pan or bottle, then plug the reservoir inlet. Fill the reservoir with fresh power steering fluid. You'll need about two quarts but it won't hurt to have more. It's not necessary to have the fluid in a gallon jug as you won't be adding that much at one time.

Now comes the change. Credit goes to Sixto for making a suggestion that I modified for use with my '87 300D Turbo (W124, OM603). He suggested removing the PS belt or serpentine belt (whichever your engine has) and spinning the PS pump by hand or using an electric drill with a buffing wheel to turn the pump. I modified this suggestion by creating a belt drive from a drill motor, and a homemade pulley and belt.





The belt was made from a length of rubber vacuum hose, a piece of plastic screw to hold the ends together, and some shrink tubing to close the gap. You can use a spare drive belt or a piece of rope -- almost anything will do. I fashioned a pulley from a power drill accessory but a small pulley with a bolt through the center would work -- again, almost anything will work and large diameter is better than small -- it spins the pump faster.





With the reservoir full, use the drill motor to turn the PS pulley clockwise. Fluid should run into the catch bottle and the level in the reservoir should drop. When the level is pretty low, stop the drill motor and refill the reservoir. Get in the car and with the steering lock disengaged, turn the steering wheel all the way to one side.

When you get out, you will see that the fluid in the reservoir has dropped. Fill the reservoir and turn the steering wheel all the way in the other direction. Again refill the reservoir and center the wheel. Refill the reservoir once more and use the drill motor to spin the pump until the reservoir is almost empty.

Put the return hose back on the reservoir inlet and install the new filter, if your PS pump uses one. Fill the reservoir and allow the air in the filter to bubble out. Spin the PS pump with the drill motor to bleed any air bubbles out of the system, adding fresh fluid as necessary. When you stop seeing bubbles, you're finished. Put the belt back on the PS pump and install the cap on the pump.

Finally, run the engine and turn the steering wheel to make sure everything works and you have no leaks. It's Miller time!

Jeremy