996 Turbo - Help - Whirring Noise from some pump I think
Discussion
Hi,
Have a '52 996 Turbo.
Just been for a drive this morning, came up to island, heading right, taking island at about 30mph but quite tight and I heard a whirring noise temporarily kick in, almost sounded like a neighbour using a drill for a second, then it went as car straightened up. Got out, checked car, checked arches, nothing catching tyres etc.
Carried on.
Heard it again when going over crest of a hill.
Carried on.
Get to half a mile from my house with it doing it round corners and it starts getting louder and doing it in a straight line or under braking.
Sounds like a pump with an empty reservoir maybe? Car is now home and when sat still you can't hear it, even when I rev slightly.
Any ideas, it sounds like when there is an g-force applied, over crest, rounds corner under braing etc it kicks in.
What could this be? Thanks in advance
Have a '52 996 Turbo.
Just been for a drive this morning, came up to island, heading right, taking island at about 30mph but quite tight and I heard a whirring noise temporarily kick in, almost sounded like a neighbour using a drill for a second, then it went as car straightened up. Got out, checked car, checked arches, nothing catching tyres etc.
Carried on.
Heard it again when going over crest of a hill.
Carried on.
Get to half a mile from my house with it doing it round corners and it starts getting louder and doing it in a straight line or under braking.
Sounds like a pump with an empty reservoir maybe? Car is now home and when sat still you can't hear it, even when I rev slightly.
Any ideas, it sounds like when there is an g-force applied, over crest, rounds corner under braing etc it kicks in.
What could this be? Thanks in advance
Ended up buying Pentosil from Porsche, cost me £4 more than GSF equivalent.
Filled the power steering pump fluid reservoir up to desired level and no noise. Seems to be turning slightly easier too which you can expect.
Fingers crossed the noise stays away and the fluid doesn't disappear indicating a leak somewhere, I will keep an eye on it
Thanks for the pointers
Filled the power steering pump fluid reservoir up to desired level and no noise. Seems to be turning slightly easier too which you can expect.
Fingers crossed the noise stays away and the fluid doesn't disappear indicating a leak somewhere, I will keep an eye on it
Thanks for the pointers
There's a leak.
In some models, not sure if this applies to the Turbo, a high pressure relief valve fails and routes high pressure to the rack. This forces fluid past the rack's seals, but the fluid is caught/held by the dust boots.
The first sign there's an issue is the power pump gets noisy form low fluid. If this is not caught in time the pump is ruined, along with the rack and the line with the bad valve of course is also shot and all need replacing.
If the pump quiets down with the topping up of fluid -- and you should never use anything but what Porsche put in there at the factory -- then you dodged one of a volley of bullets.
Get the car in the air and have a knowledgeable tech give the rack dust boots a grope and a squeeze and if they feel like discount breast implants -- don't ask how I know what these feel like -- another bullet in the volley just hit target.
'course, even if the boots feel ok, the fluid had to get out somehow so a thorough inspection of the power steering fluid circuit is in order.
In some models, not sure if this applies to the Turbo, a high pressure relief valve fails and routes high pressure to the rack. This forces fluid past the rack's seals, but the fluid is caught/held by the dust boots.
The first sign there's an issue is the power pump gets noisy form low fluid. If this is not caught in time the pump is ruined, along with the rack and the line with the bad valve of course is also shot and all need replacing.
If the pump quiets down with the topping up of fluid -- and you should never use anything but what Porsche put in there at the factory -- then you dodged one of a volley of bullets.
Get the car in the air and have a knowledgeable tech give the rack dust boots a grope and a squeeze and if they feel like discount breast implants -- don't ask how I know what these feel like -- another bullet in the volley just hit target.
'course, even if the boots feel ok, the fluid had to get out somehow so a thorough inspection of the power steering fluid circuit is in order.
Rockster said:
There's a leak.
In some models, not sure if this applies to the Turbo, a high pressure relief valve fails and routes high pressure to the rack. This forces fluid past the rack's seals, but the fluid is caught/held by the dust boots.
The first sign there's an issue is the power pump gets noisy form low fluid. If this is not caught in time the pump is ruined, along with the rack and the line with the bad valve of course is also shot and all need replacing.
If the pump quiets down with the topping up of fluid -- and you should never use anything but what Porsche put in there at the factory -- then you dodged one of a volley of bullets.
Get the car in the air and have a knowledgeable tech give the rack dust boots a grope and a squeeze and if they feel like discount breast implants -- don't ask how I know what these feel like -- another bullet in the volley just hit target.
'course, even if the boots feel ok, the fluid had to get out somehow so a thorough inspection of the power steering fluid circuit is in order.
This, except I don't quite understand how the rack would get damaged? All it's losing is its power assistance.In some models, not sure if this applies to the Turbo, a high pressure relief valve fails and routes high pressure to the rack. This forces fluid past the rack's seals, but the fluid is caught/held by the dust boots.
The first sign there's an issue is the power pump gets noisy form low fluid. If this is not caught in time the pump is ruined, along with the rack and the line with the bad valve of course is also shot and all need replacing.
If the pump quiets down with the topping up of fluid -- and you should never use anything but what Porsche put in there at the factory -- then you dodged one of a volley of bullets.
Get the car in the air and have a knowledgeable tech give the rack dust boots a grope and a squeeze and if they feel like discount breast implants -- don't ask how I know what these feel like -- another bullet in the volley just hit target.
'course, even if the boots feel ok, the fluid had to get out somehow so a thorough inspection of the power steering fluid circuit is in order.
REALIST123 said:
This, except I don't quite understand how the rack would get damaged? All it's losing is its power assistance.
One way -- and there may be other ways -- the rack gets damaged is the over pressure compromises the rack seals. After the rest of the system is repaired the rack will then leak.If the seals are renewable I do not know.
Up to you and your tech, if this has in fact happened. If he says let's see about the rack then leave it in service. The dust boots might have to be renewed because of the exposure to the power steering fluid.
But if the rack seals do not leak then you're good to go. Otherwise the car has to go back in the shop for a new rack and probably an alignment as well.
As prediceted - Noise returned yesterday, fluid low again. Left it immediately and collected it today after topping the fluid back up a little.
It's due in for a check ASAP. I had a brief look over the top of where I fill up the reservoir and can't see any signs of leakage although will have another proper look tomorrow with a torch. Still driving fine, when topped up with fluid there is no noise or vibration from the pump whatsoever. Is this like to cost me £000s or £0'000s ?!?!?!
Cheers
It's due in for a check ASAP. I had a brief look over the top of where I fill up the reservoir and can't see any signs of leakage although will have another proper look tomorrow with a torch. Still driving fine, when topped up with fluid there is no noise or vibration from the pump whatsoever. Is this like to cost me £000s or £0'000s ?!?!?!
Cheers
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