Strosek Ultra

This is the reply, Google translated from german to english, I recieved from Herr Frank Herrmann at GEBA-Autoteile GmbH concerning 928 pump impeller that come off the shaft and damage the engine block:

"We know the pumps are for the 928 and we've heard of these problems too.

We have not yet had the problem with our pumps, as the impellers are pressed onto the shaft with great force and can no longer change their position.

In addition, our dimensions are always approx. 0.2-0.3 mm below the original dimensions.



We can imagine that this problem is caused by a worn out bearing shaft!

There is then a movement in both the axial and the radial direction, which, given the small gap dimensions, then leads directly to contact with the engine block.

But of course these are only assumptions, as we have not yet seen a pump where the impeller grinded on the engine block."

Lizard928

The one that leaked was Pentofrost NF (Pentosin line).
The one with some bearing play did not leak or show any signs of leaking was Prestone 50/50 w/ Cor guard.

Mark Anderson

I asked one of my suppliers today "Do you seen any difference with warranty returns between Geba and Laso"
his response was "Not really. Geba & Laso have always been about the same"

Kevin in Atlanta

I finally got Rick's car buttoned up and the AC blowing very cold and then today the water pump gave it up.

In the video you can hear the impeller hitting the block. I assume it is a metal impeller. I put my mechanic's stethoscope and the sound was like a bang.

According to Rick the water pump is two years old. Manufacturer and whether it is new or rebuilt is not known yet.

EDIT: GEBA 2 years and 8 months since it was put on there.

No knock at idle, but as revs increase you get a metronome sound.


I hate it that it was not known when I had the car apart. Now, all the work has to be done again. Sadness.

merope

Well, I just discovered this thread. I don't have any WP failures to report, but I would have a question about what I should do. I recently bought an 86.5 with 37k mi. The PO didn't drive it much, bought it with 33k mi in 2008 and replaced the TB and the WP himself. I know that the TB was contitech, but don't know what brand the WP was.

Q: They only have 4k mi on them, but are 13 years old. The car was stored in a A/C garage all this time and rarely brought out into the AZ desert elements. Should I be worried at all about the TB and/or WP? I know I will need to address it at some point in time, but was hoping that would be a year or two down the line. I'd like to enjoy the car for a while before taking it apart.

Kevin in Atlanta

Well, I bought an 88 a couple of months ago with 5k miles and 21 years on the waterpump and timing belt. The waterpump lasted about a month before the impeller (I think) separated. The car sat in a garage for about 14 years before it came into my possession.

GregBBRD

I'm not sure I would even turn the key on a 928 with a 13 year old Continental belt....especially on an 86.5...which have the most labor intensive 928 engine made, in terms of removing and installing the cylinder heads.

merope

Oh crap, not what I wanted to hear.

Strosek Ultra

In 2030, the sale of new cars with fossil-burning internal combustion engines will be banned in the European Union. What then will happen to smaller subcontractors to the European car industry? Subcontractors who may have one or a few products directly intended for the internal combustion engine. Production of water pumps will cease, electric cars do not need a water pump. Maybe we can hope for the Chinese? Will we have access to fuel for our old cars that are still powered by an internal combustion engine?
Åke

gazfish

928’s havnt been in production for 26 years but parts are still being manufactured for all the ones that stilll exist, IC cars aren’t going away overnight. The millions that already exist will take a long time to be replaced and I think there will always be fuel for classic cars even if it’s a green biofuel of some sort.

The Forgotten On

^^ Porsche is heavily investing into carbon neutral synthetic fuels for classic cars. So we should have options.

Kevin in Atlanta

The knocking pump is a GEBA with a metal impeller. I've not taken the the car apart, but this is what the owner has been told by his mechanic.

The pump was installed in 2018. The waterpump is 6-8 months out of warranty.

merope

Looking through the receipts, I noticed that only the serpentine belts were Conti that were replaced. Apparently, for TB, the previous owner used OEM Porsche part. Hopefully, that makes the case *slightly* better and less worrisome!

GregBBRD

Hopefully, as more and more electric cars are made, people/governments will come to their senses and change these mandates....the whole electric car thing is absurd.

GregBBRD

It's a real disaster when a water pump with a metal impeller goes bad and the impeller hits the block.
Even if the failure rate of Geba pumps was one out of a hundred, I still could not/will not install one, for that reason, alone.
If someone comes in and insists I use a Geba pump, I respectively suggest that they would be happier at a different repair facility.

After all, Porsche decided that metal impellers were not an option 32 years ago!
What the 'ell does it take to learn that lesson?