Looking for help on a Type II Power Steering Pump problem - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-27-2012, 09:24 AM
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Looking for help on a Type II Power Steering Pump problem

Hi guys,

This is my first post here - thought that some rodders might be able to help me out! I have a rack and pinion installed in a '66 Mustang. It uses the GM Type II power steering pump. I'm currently having a really weird problem with it and can't figure out what to do to fix it...

Symptoms:
-When you first start the car up, power steering works great
-Once the car is warmed up fully (20+ mins of driving) you lose almost all (or all) power steering
-Power steering works better at higher RPMs - going the same speed in neutral and first gear, I get no assist in neutral and a little bit in first
-When I pop the hood while idling, there are fluid tracks coming from the vent
-I can remove the cap while idling and warmed up and, given about 10 seconds, the fluid will start swirling again and power steering will come back in full
-The fluid is hot (but not hot enough to burn)
-All hoses are at least half an inch away from the headers

For what it's worth, this is a new low-flow version of the pump. I am running a 130micrometer filter in the return line. The rack works fine with no binding and drives great when you get the assist.

It seems to be to be something related to heat or excessive pressure, but I don't know what to do about it or even if that is the actual cause. Any help is appreciated! Thanks.

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Old 04-28-2012, 07:46 AM
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Sounds like the cap or vent is plugged and the system is pulling a vacuum on the reservoir and starving the pump. What's up with the filter? I've never seen that before, and that could be part of the problem. I'd remove it and see if you get a change...

Russ
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Old 04-28-2012, 03:18 PM
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Yeah, I think that might be it... any tips in particular for unblocking the vent?

I was leaning towards the filter too since it has never had that problem before the filter was installed, but it just seems unusual that removing the cap on the pump causes power steering to return. Someone also suggested that the filter might have made it harder to bleed the system so some air might still be trapped in there - but again, it doesn't explain the whole cap thing.

The filter is on there for safety. Basically, long story short, my car has a history of destroying anything that isn't protected. Thus, all systems with fluid in them have filters (brakes being the exception). The filter might be clean and free of debris for thousands of miles, but if I remove it there is a nearly 100% chance of something inexplicably getting sucked up in there shortly thereafter :shrug: Just the nature of my beast, I guess.
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Old 04-29-2012, 09:00 AM
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I'd try running it with the cap loose and see, if that's the fix then buy a new cap. Or remove the filter temporarily, it's got to be one of those two...

Russ
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