89 535 Power Steering Question

[89535i]

Hey,

I had a wining noise coming from the power steering pump. Then I had the pump replaced, and it wines more! I took the cap off the fluid resoviour and the fluid looked bubbly/airy. The unit is leaking, but I cann't determine where. I believe one of the hoses has a crack in it. Has anyone else encountoured this problem? If so, how much are new hoses for the power steering, I counted 3 hoses, and they all look pretty expensive.

[Martin in Bellevue]

You could order the rebuild kit from BMA. The internal seals wear out. If replacing the hoses, check with a local shop that can refit new hose to your existing ends. It may be cheaper than new bmw hoses.

[Beemr750]

Very much on the suction side but should have stains showing.Does it affect the overall operation?

[Kalevera]

Pull the reservoir and clean it.

Strawberry milkshake is a sign that there's air in the system (typical after an immediate fill -- do a search, I've written on how to bleed the P/S system a few times).

Leaks are typical -- check crush washers at the banjo bolts and crimp clamps at the reservoir fittings (latter can be replaced with good quality hose clamps for a better seal).

If the replacement pump was new or a rebuild by a quality shop, the chattering is likely due to fluid starvation (hence my suggestion to clean the reservoir/filter). But be sure that it's properly bled, first.

best, whit

[Beemr750]

Just remember of another tip to look at.The pressure hose has halfway a orifice or restriction build in,some times this causes whining noises like it's coming from the pump.In the early days this was common esp on M/Bs.Wiggle on the hose and see if the noise changes.

[89535i]

Very much on the suction side but should have stains showing.Does it affect the overall operation?

The actually easier to turn the steering wheel. Thats the only effect i notice.

[89535i]

Pull the reservoir and clean it.

Strawberry milkshake is a sign that there's air in the system (typical after an immediate fill -- do a search, I've written on how to bleed the P/S system a few times).

Leaks are typical -- check crush washers at the banjo bolts and crimp clamps at the reservoir fittings (latter can be replaced with good quality hose clamps for a better seal).

If the replacement pump was new or a rebuild by a quality shop, the chattering is likely due to fluid starvation (hence my suggestion to clean the reservoir/filter). But be sure that it's properly bled, first.

best, whit

Thank you, the fluid does look like "strawberry milkshake". I will try this weekend. It only makes noise when you turn the wheel. On idle is a very quite whine, but it whines nontheless.