I recently replaced the ps pump, control valve and cylinder, along with new hoses and fluid. I am experiencing a pulsation problem during very low speed turning. Before I remove and replace anything, I want to try to thoroughly bleed the system again.

What is the recommended bleeding procedure?

 

Are you sure your P/S belt isn't slipping?

 

Yes, I re-tightened the belt and nothing changed.

 

Fill system..the start engine and turn wheels back/forth....air bubbles come out at fill neck on pump....works for me...

 

It is best to try and get the air out of the system BEFORE starting your engine. If you start your engine and try and expel the air, what happens is that the air goes through the pumping section of the pump and gets whipped together with the oil. You now have a milky froth that you now have to wait until the millions of tiny air bubbles condense together and work their way out of solution. Also, that milky fluid is actually compressible (due to all the entrapped air in solution). This compressible fluid causes the power assist to be erratic.

First, jack the front wheels off the ground. Rotate the steering wheel full lock to full lock about two dozen times without starting the engine. Recheck the fluid level and fill as required halfway through the procedure. Recheck and refill at the end.

Let the car down, start the engine and steer lock to lock a couple times. Recheck the fluid level, then go for a short ride. You should be done.

Once you have started your engine and created a lot of milky, foamy, fluid, it will require sitting overnight for a lot of the air to reform bigger bubbles and start working their way back to the pump reservoir. Try my deaireation technique the next morning.

JIM

 

Jim has a point..I've always done it cold with engine.....once power steering fluid warms up,then it is a problem...

 

And I'm told you avoid this by priming the pump. You connect up the pump but before you fit the belt you fill the system and turn the pulley over several times by hand which primes the system avoiding the need to bleed.

 

Turning the pump driveshaft may circulate fluid in the pump, but it won't circulate fluid down into the assist cylinder. The only way to get air out of the assist cylinder is to cycle it full stroke.

Jim

 

Jim Shea's procedure is the way to do. I replaced all components and hoses on my 71 vert and this is the procedure I ollowed, worked like a charm. The pump is an AGR performance, the instructions Jim described are exactly what AGR stated in the installation procedure.

you may also need to adjust the control valve to balance it.