The power steering in my1966 230/W110 has high pressure being developed in the reservoir .this eventually spews the fluid out under pressure. The pump was replaced but the problem is still there .Apparently there is a air leak somewhere. Can this be traced in a systematic way?
Thanks
mak

I'm no expert at all but are you sure there isn't too much fluid in the system?

thanks As there is a fluid level marking built in the container so no chance of errors there
mak

I am curious as well since my 108 does the same thing, even after a local shop rebuilt it.

Best Regards,

David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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I would think the easiest way to trace such an air leak would be to turn the wheel with the system off and look for signs of a PS fluid drip (maybe add UV dye if it's a tiny drip). However, I think they all leak from the gearbox, so I'd start looking there. Never really thought about it but yeah, I suppose the inlet would pull a vacuum that could allow enough air in to cause a large pressure buildup!

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

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1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

You still have air in your system crack the line at the pump and bleed. don't over fill needs the room for hard steers;

Have a look at this recent post for a one man power steering pump method

Easy 1-person PS Fluid Change DIY

(You could also use one of those emergency fan belts instead of some vacuum tubing)

What you are getting is foaming from air in trhe steering box. Look at the top of the box and there is a small bleed nipple. Crack this open and fit a tube (tightly!) .Point the tube into the power steer reservoir and start the engine. let it idle and as it idles watch the fluid coming from the hose. get someone to gently and slowly turn the wheel left to right through it's locks.
When it runs clear,check the level and top it to the mark. You may find it necessary to top it up as it runs before it goes clear. Once it's clear and at the correct level stop the engine. Remove the tube and tighten the nipple and replace the fluid cap.

A big mistake is often made when the reservoir is checked with the engine off. This gives the impression that the system is full when in fact it isn't.

After the system is bled and clear fluid runs out all is well. Then the system re-develops pressure and foamy oil after awhile & This then spews out .
mak

The only cause i can think of that does that is the fluid is being allowed to drop too low and the pump is sucking air into the system. Check thoroughly the entire steering system for leaks . There is nothing wrong with the pump and they very rarely fail.
The box MUST be dry and the low pressure hose Must be in good condition. A lot of folks dismiss a sweaty hose because they cannot see drips of fluid but over a couple of thousand miles you can lose enough fluid to cause foaming and noise in the pump.

Rebled the system but as yet i have not been able to diagnose or pinpoint the fault.
mak

Being so far it's hard to tell if you are doing as i suggested. If you have then it's a problem in the steering box. It has a leaking internal seal and/or dirt which is holding the valve open allowing full pressure to bypass the steering gear and running full pressure back to the reservoir. The only cure is to remove the steering box and overhaul it. This is very rare BTW.