Why would the cap on the power steering pump blow off and the fluid spray out?

Tiny
SD75
  • MEMBER
  • 1992 FORD THUNDERBIRD
  • 98,325 MILES
1992 Ford Thunderbird 5.0 liter engine. Problem started after rack was replaced by garage. Has happened twice. No warning. Just hear a loud bang and out comes the fluid. Happens at idle. Garage wants to replace pump now.
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Friday, September 30th, 2011 AT 1:26 PM

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Tiny
MHPAUTOS
  • EXPERT
I would be thinking that the pump is at fault, you can get the pump line pressure check just to be sure all is ok, but if it is a problem that is not constant this may not show much, but it is a test I would consider.

POWER STEERING PRESSURE TEST. A power steering pressure test checks the operation of the power steering pump, the pressure relief valve, the control valve. The hoses. And the power piston. Basic procedures for performing a power steering pressure test are as follows: Using a steering system pressure tester, connect the pressure gauge and shutoff valve to the power steering pump outlet and hose. Torque the hose fitting properly. With the system full of fluid, start and idle the engine (with the shutoff valve open) while turning the steering wheel back and forth. This will bring the fluid up to temperature. Close the shutoff valve to check system pressure. Note and compare the pressure reading with manufacturer s specifications.
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Friday, September 30th, 2011 AT 1:34 PM
Tiny
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I don't think a pressure test will help. The steering works fine until the fluid boils over. Could the garage make a mistake and put the wrong type of fluid in? Is there a pressure relief valve that could get stuck?
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Monday, October 3rd, 2011 AT 12:24 AM
Tiny
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Automatic trans oil type F is used, the pressure test will show a faulty relief valve in the pressure readings.
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Monday, October 3rd, 2011 AT 4:49 AM

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