docmirror

Do we/anyone know what front bearing Porsche uses in their new pumps?

I agree that a cylindrical roller with dual seals would be the way to go for the radial loads generated, but I'm thinking that maybe Porsche uses a double row spherical ball out there.

On a related note, there are huge, long, ugly threads on the 996 forum about the IMS bearing type, spec, design, modification vis-a-vis double row ball vs roller. One can tell who the engineers are pretty quick.

linderpat

Now yur talkin

GregBBRD

Porsche uses a ball/roller style.....pretty standard cartridge, actually. These bearing cartridges are fairly long, allowing everything to be contained in one piece. Single seal in the rear is pretty standard. Then the set of ball bearings to control any thrust. Then the set of roller bearings (hopefully) at the pulley end, for load.

Water pump bearings live in a hellish environment. Hot steamy water millimeters away from a seal and then a greased bearing. Tiny amounts of leakage can presumably leak out the weep hole between the seal and the first bearing....but any significant leakage instantly "steam cleans" away the grease. Bearing failure occurs very soon after.

My rule of thumb, when looking at water pumps:

If there is any residue coming out of the weep hole, it is time for a new water pump.

Randy V

Anything seen coming from that hole are usually tears from the 928 owner, hence the name for that hole.

GregBBRD

James Bailey

Porsche in a tech bulletin when the cars were under Warranty tried to say seepage was NOT covered under warranty. RIGHT it's OK. , keep driving until it is out of warranty .

MainePorsche

Did it say 'seepage' not covered, or 'weeping' not covered...

MainePorsche

As an aside relative to a recent thread, the Guardian pump has the bracket for the tensioner.

Tom in Austin

Geez, the world was so simple back in the 70s when any $20 water pump in a white box worked fine on my Cutlass ... and only took about an hour to install ;-)

James Bailey

Been many years since I saw that.....Not sure the real difference . Just that Porsche Dealers were being told it was not covered under warranty and Porsche was not going to pay them......perhaps someone can locate the bulletin? ?

hacker-pschorr

It's common in BMW workshop manuals to mention "Seepage, Weepage, and Leakage" as various stages of a leak to either be ignored, watched or actually fixed.

Rob Edwards

Vhwuala:

MainePorsche

Jim,
I was poking at the 'tears' not being covered.
They never are.

mark kibort

Barrs stop leak! (after all, it does say used by OEM manufacturers on the label)

Randy V

Porsche calls that orifice a 'breather hole'. Voila!