What should the pressure be of the power steering fluid that the power steering pump
11-10-2018, 11:55 AM
#1
2nd Gear
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What should the pressure be of the power steering fluid that the power steering pump
I have a 1987 Porsche 928 S4 that has very hard steering. I would like to test the PSI of the fluid that is put out by my Power Steering pump.
11-10-2018, 03:08 PM
#4
Chronic Tool Dropper
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My high-pressure ps pump relieves at 100 barg.
the original has lower relief as Fred points out.
It’s easier to rebuild the pump than it is to plumb a pressure-test fixture on the car.
the original has lower relief as Fred points out.
It’s easier to rebuild the pump than it is to plumb a pressure-test fixture on the car.
11-10-2018, 03:27 PM
#6
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Any system that has a positive displacement pump needs a relief valve to prevent the housing from grenading in the event of a blockage- that or the belt slips due to the motive force needed to drive the pump in such conditions.
11-10-2018, 04:18 PM
#7
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I replaced the pump with a rebuilt one i bought from 928srus . I replaced the steering rack with a rebuilt one from 928intl and i replaced the high pressure hose as well....Unless I was drinking too much beer when I replaced the steering rack, I put the new one in as the old one was installed. That being said I will crawl under it again and recheck the hoses to the rack.It steers like an 18 wheeler even when all the pieces were replaced. I even checked the steering wheel knuckle to see if it was jamming up and it turns freely......
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11-10-2018, 06:17 PM
#8
Team Owner
check the tire pressure in the front tires
11-10-2018, 11:41 PM
#9
Chronic Tool Dropper
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Go drive another 928 please. The parking lot steering effort is higher than you might otherwise expect. At speed it’s just perfect.
11-11-2018, 03:14 AM
#10
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I used to have extra hard steering, then I replaced the tie rods and it got a whole lot better.
The 928 has notoriously heavy steering compared to most power steering equipped cars. I don't notice it until I drive a more modern car.
The 928 has notoriously heavy steering compared to most power steering equipped cars. I don't notice it until I drive a more modern car.