Turbo cooling pump
- Thread starter berg944
- Start date
As I understand, it was introduced by Porsche as a knee jerk reaction to 924 Turbos failing. It is obviously a good idea as, when first supplied to red braces city types, such get up and go idividuals couldn't be trusted to let their cars idle for a few minutes after "...giving the old girl a good thrashing, what!"
Many American racing tuners exclude the water cooling on upgraded turbos which would perhaps suggest that, if handled with care and allowed to cool after thrashing, it is an unnecessary complication. It is the "...if handled with care and allowed to cool after thrashing..." bit that is important.
John Maddox
New member
I'm sure my turbo pump is on the blink too - does anyone know cost of replacing and if it can be done myself (moderately experienced diy mechanic) ??
Lemon
Member
Hi
The pump also works off a temp sensor switch on the engine, which is sometimes a bit wobbly!!! Plugs in right at the front top section as you first look in the engine bay. You can check if this is working by shorting it out with a short peice of wire to the bodywork. Sometimes these switches fail (I believe they are £40 ish although I may be wrong).
Also the pumps squeal or fail as they become misaligned and a quick dismantle and re-assembly helps it free itself up (again I read this somewhere, so correct me if I am wrong)
My pump was seized when I bought my car so I replaced it in May of this year.
Part cost was £145.59 and they charged me £45.83 to fit it, although I do not think it would be that difficult to fit, I was just being lazy.
Hope this is of some help
Lee
The pump also works off a temp sensor switch on the engine, which is sometimes a bit wobbly!!! Plugs in right at the front top section as you first look in the engine bay. You can check if this is working by shorting it out with a short peice of wire to the bodywork. Sometimes these switches fail (I believe they are £40 ish although I may be wrong).
Also the pumps squeal or fail as they become misaligned and a quick dismantle and re-assembly helps it free itself up (again I read this somewhere, so correct me if I am wrong)
My pump was seized when I bought my car so I replaced it in May of this year.
Part cost was £145.59 and they charged me £45.83 to fit it, although I do not think it would be that difficult to fit, I was just being lazy.
Hope this is of some help
Lee
danmason
New member
No. I'm no authority on the subject, but essentially when an engine runs at high power/high torque, the turbocharger is operating at very high temperatures and speeds. Hot shutdown can reduce the life of the turbocharger; to avoid this you should make sure the turbocharger has time to cool, and in the absence of a pump it is best to leave the engine to idle for a minute or two before switching off after a spirited drive. Alternatively, don't rev high or use the turbo in the last 5 miles or so of your journey.
I have a pump in the garage - should have the thermostat too, but then again it's probably plugging a hole in my water jacket and I honsetly haven't looked [
]![[FONT=verdana,geneva"]](/forum/styles/default/pcgb/space.gif ". [FONT=verdana,geneva\"]")
As I recall there is a way of testing it by connecting across pins on the thermostat, but I've never had a problem so I don't know the detail. If you figure out it's the pump I can sort you out with one. It's probably not worth the hassle of swapping my good thermostat with your bad one if that's the culprit though as I assume it would mean losing some of my whizzy expensive antifreeze. Of course if it turns out I can get my thermostat off without losing coolant/having to disassemble half the engine then you can have that, it's not like it matters to my car if it works or not.
] As I recall there is a way of testing it by connecting across pins on the thermostat, but I've never had a problem so I don't know the detail. If you figure out it's the pump I can sort you out with one. It's probably not worth the hassle of swapping my good thermostat with your bad one if that's the culprit though as I assume it would mean losing some of my whizzy expensive antifreeze. Of course if it turns out I can get my thermostat off without losing coolant/having to disassemble half the engine then you can have that, it's not like it matters to my car if it works or not.
Hi, yes back for a couple of days then off again - hopefully back for next weekend so ican put my car back together.
Grounding the lead that goes to the temp sensor should make the pump run (ignition may have to be on), this should let you checkif the pump is working reliably. I am not sure where the 30 second delay is controlled from, probably, one of the relays.
Tony
Grounding the lead that goes to the temp sensor should make the pump run (ignition may have to be on), this should let you checkif the pump is working reliably. I am not sure where the 30 second delay is controlled from, probably, one of the relays.
Tony
should run for circa 30 seconds every time you stop the engine - no matter how short the run time.
Grounding the wire on top of the temp sensor (to left of turbo) should make the pump run, the sensor works by grounding that wire at IIRC 115 degrees C
I guess the relay controls the 30 second run after switch off. but it is just a guess.
Tony
Grounding the wire on top of the temp sensor (to left of turbo) should make the pump run, the sensor works by grounding that wire at IIRC 115 degrees C
I guess the relay controls the 30 second run after switch off. but it is just a guess.
Tony
Posts made and opinions expressed are those of the individual forum members
Use of the Forum is subject to the Terms and Conditions
