Cheap water pump?
#31
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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.
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.
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#32
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GREAT NEWS!
There's an even cheaper 928 water pump at http://tinyurl.com/oswdwow
Higher quarity, too. Just to eliminate risk, I might install two of them.
There's an even cheaper 928 water pump at http://tinyurl.com/oswdwow
Higher quarity, too. Just to eliminate risk, I might install two of them.
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#33
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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.![Stick Out Tongue](https://rennlist.com/forums/images/smilies/tongue.gif)
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.
![Stick Out Tongue](https://rennlist.com/forums/images/smilies/tongue.gif)
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.
#34
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#35
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#36
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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 .
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#37
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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? ?
#41
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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.
#42
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Vhwuala:
![](https://webfiles.uci.edu/redwards/public/Porsche%20water%20pump%20seepage%20TSB%207-30-91%20%20%2011-3-15.jpg)
#44
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