after run coolant pumps - old vs. new design

davenew · 11-13-2005, 03:43 PM

Here's the old pump housing. It appears the leak was due to the o-ring being dry rotted. I was able to turn/tighten all four housing screws about 1/8 turn.

The old impeller. Notice the concave area between the blades. THe new one is not the same. The motor and this impeller have a magnetic coupling. THe oring is more square than round

Very dry rotted square oring.. that should be round.

The motor with the magnetic coupling, that the impeller assy (shown above) fits into.

Backside of impeller assy. No oring on this side.

Old vs. new impeller assys. If you look closely, you'll see two differences.

New

Old

New, with oring

I'll bet anyone $20 that installing a new oring into the old housing would fix the coolant leak. You would need a new oring with ID=1.690" and 0.075 THK. The impeller housing surface that the oring fits around is 1.695" Yea, you would probably need to convert to mm. Maybe someone that would like to save $125 can beta test it

~~Mat Indukts Lambos~~ · 11-13-2005, 03:48 PM

I have a nice selection of o-rings too.

Nick Gustas · 11-13-2005, 04:07 PM

"Emergency" repair, but as far as I know it's still good.

If mine ever leaks I'll just do that or a new o-ring plus sealant.

VerrÜckt · 11-13-2005, 04:10 PM

Eric 2.7 · 11-13-2005, 05:14 PM

davenew · 11-13-2005, 05:22 PM

If the plastic gets brittle I guess a new oring wouldn't help much. How many miles on yours at the time?

Nick Gustas · 11-13-2005, 07:27 PM

nyet · 11-13-2005, 09:40 PM

Mark P · 11-14-2005, 06:40 AM

I'd be willing to try a new oring first if it looks like that's the only issue.

Where did you buy your new $125 pump from? Just curious to see if it can be had for cheaper than that if I end up needing one

Eric 2.7 · 11-14-2005, 07:09 AM

and more or less came apart with very little effort.

11-13-2005, 03:43 PM	#1
davenew AudiWorld Super User Account #: 70028 Join Date: Feb 2004 Posts: 7,828	after run coolant pumps - old vs. new design Here's the old pump housing. It appears the leak was due to the o-ring being dry rotted. I was able to turn/tighten all four housing screws about 1/8 turn. The old impeller. Notice the concave area between the blades. THe new one is not the same. The motor and this impeller have a magnetic coupling. THe oring is more square than round Very dry rotted square oring.. that should be round. The motor with the magnetic coupling, that the impeller assy (shown above) fits into. Backside of impeller assy. No oring on this side. Old vs. new impeller assys. If you look closely, you'll see two differences. New Old New, with oring I'll bet anyone $20 that installing a new oring into the old housing would fix the coolant leak. You would need a new oring with ID=1.690" and 0.075 THK. The impeller housing surface that the oring fits around is 1.695" Yea, you would probably need to convert to mm. Maybe someone that would like to save $125 can beta test it __________________ '00 S4 EPL Stg 3 (March'04-May'08) '08 BMW 135i Dinan Stg 2 (May'08-Present) '00 S4 Imola widebody AWE Stg 3 (Bought Nov'08. AWE stg 3 kit is sold.. I'm switching over to ASP GT soon)

11-13-2005, 03:48 PM	#2
~~Mat Indukts Lambos~~ Banned Account #: 54525 Join Date: Apr 2003 Posts: 5,753	I just threw a bad one away, too bad, I could've played with that idea. I have a nice selection of o-rings too.

11-13-2005, 04:07 PM	#3
Nick Gustas Senior Member Account #: 3094 Join Date: Mar 2000 Posts: 7,470	Mike fixed Verruckts with blue gasket maker summer 2004 IIRC. "Emergency" repair, but as far as I know it's still good. If mine ever leaks I'll just do that or a new o-ring plus sealant.

11-13-2005, 04:10 PM	#4
VerrÜckt AudiWorld Super User Account #: 52044 Join Date: Feb 2003 Posts: 16,416	Started leaking shortly after a year. I need to fix it this winter. :-(

11-13-2005, 05:14 PM	#5
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	Not my pump. The housing on mine was basically crumbling. __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

11-13-2005, 05:22 PM	#6
davenew AudiWorld Super User Account #: 70028 Join Date: Feb 2004 Posts: 7,828	the plastic pump housing? If the plastic gets brittle I guess a new oring wouldn't help much. How many miles on yours at the time? __________________ '00 S4 EPL Stg 3 (March'04-May'08) '08 BMW 135i Dinan Stg 2 (May'08-Present) '00 S4 Imola widebody AWE Stg 3 (Bought Nov'08. AWE stg 3 kit is sold.. I'm switching over to ASP GT soon)

11-13-2005, 07:27 PM	#7
Nick Gustas Senior Member Account #: 3094 Join Date: Mar 2000 Posts: 7,470	Not too bad, better sealant job and/or a new o-ring would probably fix it if nothing is cracked yet.

11-13-2005, 09:40 PM	#8
nyet Member Account #: 13093 Join Date: Dec 2000 Posts: 33,114	my housing self destructed at around 80k __________________ ------------------------------------- "It's easier to practice medicine without a license in this country than it is to get info on tuning Motronic." -JasonS9 ECUxPlot - my java based ECUx/VAGCOM/VCDS plotter My hacked version of Flyboy's ECUx template. S4Wiki - CONTRIBUTE TODAY! Web based FATS calculator for ECUx and VAGCOM logfiles Sync your iPod under Linux! Definitive S4 DIY Thread of Doom AWOT Brain Trust #101 AWOT Axis of Evil Member #6 Member, Aw0t Fish Taco Dinner Club I say to you that the VCR is to the American film producer and the American public as the Boston strangler is to the woman home alone." - Jack Valenti, President and CEO of the MPAA this site is NOT for information sharing it's strictly for multiple monologues that result in none of the participants changing their point of view - frank

11-14-2005, 06:40 AM	#9
Mark P AudiWorld Expert Account #: 139 Join Date: Mar 2000 Posts: 27,942	Very cool - thanks - I'll pull mine shortly and see what mine is in need of I'd be willing to try a new oring first if it looks like that's the only issue. Where did you buy your new $125 pump from? Just curious to see if it can be had for cheaper than that if I end up needing one __________________ Mark P Current: '04 Porsche 911 Turbo, Speed Yellow - website - 26k miles '02 Audi S4 Avant, Imola Yellow, APR Stg3 - website - 191k miles '01.5 VW Golf 4dr 1.8T, Satin Silver, GT28R - website - 203k miles '09 VW Tiguan 2.0T, Candy White - Hers Previous: '00 Audi A4 1.8T, Silver - Quattrobonium website

11-14-2005, 07:09 AM	#10
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	About 75k. Basically all the plastic on both sides of the housing had hair line cracks and more or less came apart with very little effort. __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

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