water pump - Bimmerfest - BMW Forums



Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)

E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

Reply
 
Thread Tools Display Modes
  #1  
Old 02-25-2019, 03:45 PM
Z3 freak Z3 freak is offline
Registered User
Location: Emmett, Id. 35 miles N/W of Boise
 
Join Date: Feb 2019
Posts: 9
Mein Auto: '02 Z3, 05 Jeep Wrangler
water pump

Not needing it yet, but just in case doing research on the best bang for your buck on a water pump for 3.0L engine. Mine does not run hot, but just wondering which brand members have had the best luck with. MEYLE brand on the Pelican website got 5 stars in review with good casting material, but don't know more than that. Just know to stay away from plastic. Will probably change out the thermostat at the same time. Comments on either??
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 02-25-2019, 04:02 PM
ixmeltxfaces ixmeltxfaces is offline
Registered User
Location: Florida
 
Join Date: Nov 2010
Posts: 72
Send a message via AIM to ixmeltxfaces
Mein Auto: E39 528i
The Stewart water pump will set you back a few bucks but it's the overwhelming favorite from what I've gathered from previous threads. As far as economical options... anything but graf and you'll be alright. The sheet metal construction in theirs tends to be less reliable.
__________________
-E39 528i: SOLD
-E85 Z4: SOLD
-E84 X1: SOLD
-R56 Mini: Daily
-E36/7 Z3: Weekends
Reply With Quote
  #3  
Old 02-26-2019, 04:38 AM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,825
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Z3 freak View Post
... Mine does not run hot... Just know to stay away from plastic. Will probably change out the thermostat at the same time...
A water pump will not make the engine run hot unless it comes apart, or the converse, if the engine runs hot, the water pump is not likely the cause.
Plastic sounds terrible, but composite was and still is BMW's OE impeller material. A solid steel impeller will never fail, but the extra weight may shorten the life of bearings and seals. I bought both a Geba steel and a Saleri composite, and decided to use the composite. The sheet metal impeller in Graf pumps can come apart.
https://www.bimmerforums.com/forum/s...4#post29228514

The water pump or thermostat will not cause sudden loss of coolant, but broken plastic parts can. The hose spigot on the radiator, the radiator itself, the expansion tank, and the connector pipe from the engine for the heater. It is convenient and efficient to replace the entire cooling system at one time, including tensioner pulley and belts.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 02-26-2019, 04:39 PM
Z3 freak Z3 freak is offline
Registered User
Location: Emmett, Id. 35 miles N/W of Boise
 
Join Date: Feb 2019
Posts: 9
Mein Auto: '02 Z3, 05 Jeep Wrangler
Wow thanks vintage42, and other members for your input. Sorry to hear that members have experience these issues with the cooling system. Seems to be problematic with as few models, but their lost can be our gain with buyers of parts side stepping those products that did not measure up to long mechanical life but have had premature failures...........sad.
Reply With Quote
  #5  
Old 02-26-2019, 04:45 PM
Z3 freak Z3 freak is offline
Registered User
Location: Emmett, Id. 35 miles N/W of Boise
 
Join Date: Feb 2019
Posts: 9
Mein Auto: '02 Z3, 05 Jeep Wrangler
Also makes one wonder why such a good product, (BMW), with a good history of reliability would have so many complaints from owners in these same areas experiencing the same problems...........hummm
Reply With Quote
  #6  
Old 02-26-2019, 04:48 PM
240Z2Z3 240Z2Z3 is offline
Registered User
Location: Avon, CT
 
Join Date: Sep 2013
Posts: 85
Mein Auto: 2002 Z3 2.5i roadster
I changed all cooling system parts except the radiator at 48K miles. The tech support at Bavarian Auto Sports suggested the radiator was good for 100K. I spent the $$$ for the Stewart pump figuring this would last as long as I own the Z3 which I hope is a long time. I also replaced the thermostat, expansion tank, fan clutch, fan, and every single hose.
Attached Thumbnails
Click image for larger version

Name:	IMG_1075.jpg
Views:	42
Size:	188.6 KB
ID:	841805  
Reply With Quote
  #7  
Old 02-26-2019, 05:33 PM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,825
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Z3 freak View Post
Also makes one wonder why such a good product, (BMW), with a good history of reliability would have so many complaints from owners in these same areas experiencing the same problems...........hummm
It is the aging of thin plastic that becomes brittle and weak from age, heat, pressure cycles, and loss of elastomers. After 20+ years and 100K+ miles, I wonder if the plastic cooling system parts in our current cars will hold up any better.

Last edited by vintage42; 02-26-2019 at 05:35 PM.
Reply With Quote
  #8  
Old 02-26-2019, 05:58 PM
raubritter raubritter is offline
Registered User
Location: Texas
 
Join Date: Mar 2008
Posts: 12
Mein Auto: 2002 Z3 3.0i Roadster 5sp
Quote:
Originally Posted by 240Z2Z3 View Post
I spent the $$$ for the Stewart pump figuring this would last as long as I own the Z3 which I hope is a long time.
This was my thinking too (Stewart also flows more coolant at a given RPM than the stock pumps, so in theory should help coolant circulation).

It was also my thinking in getting an aluminum radiator during my cooling system refresh (I got VSL). I don't miss worrying about a plastic radiator breaking...

I also did the fan delete, so I don't worry about the plastic mechanical fan exploding anymore. I added another electric fan (the car already comes with one stock) just in case, but it basically never comes on.
Reply With Quote
  #9  
Old 02-27-2019, 10:34 AM
Z3 freak Z3 freak is offline
Registered User
Location: Emmett, Id. 35 miles N/W of Boise
 
Join Date: Feb 2019
Posts: 9
Mein Auto: '02 Z3, 05 Jeep Wrangler
Plastic radiators and plastic fans?? Are either an engineering design approved by corporate for purpose of cutting weight or cutting overhead cost! Also profiting after market vendors knowing that even under normal driving conditions, these parts will sustain premature failure!! Sadly we have to turn to these vendors for a new and hopefully improved product to replace OEM..........
Reply With Quote
  #10  
Old 02-27-2019, 11:23 AM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,825
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Z3 freak View Post
Plastic radiators and plastic fans?? Are either an engineering design approved by corporate for purpose of cutting weight or cutting overhead cost! Also profiting after market vendors knowing that even under normal driving conditions, these parts will sustain premature failure!! Sadly we have to turn to these vendors for a new and hopefully improved product to replace OEM..........
Plastic radiators and fans have been the norm on vehicles for decades. They were probably selected for cost and weight, but not for premature failure, whatever that means. The soldered tubes and tanks of the old metal radiators often failed, too.
For the Z3 you can buy all-aluminum radiators, and solid steel water pumps. They cost a lot more.

The plastic pipe connectors from the engine to the heating system would be prohibitively expensive to reproduce in metal. The 4 and the 6 have a long connector pipe that would difficult in metal. And the 4 has a complex Y connector that has doomed many an engine.
Attached Thumbnails
Click image for larger version

Name:	01 Plastic connector.jpg
Views:	20
Size:	31.4 KB
ID:	841903   Click image for larger version

Name:	09 Plastic connector.jpg
Views:	19
Size:	35.8 KB
ID:	841905  

Last edited by vintage42; 02-27-2019 at 11:36 AM.
Reply With Quote
  #11  
Old 02-27-2019, 11:48 AM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,825
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by 240Z2Z3 View Post
I changed all cooling system parts except the radiator at 48K miles. The tech support at Bavarian Auto Sports suggested the radiator was good for 100K....
Forum wisdom suggests the radiator is no better than the rest of the system.
https://www.bimmerforums.com/forum/s...1#post29836901
Did you also replace the plastic pipes?
Reply With Quote
  #12  
Old 02-27-2019, 04:13 PM
Z3 freak Z3 freak is offline
Registered User
Location: Emmett, Id. 35 miles N/W of Boise
 
Join Date: Feb 2019
Posts: 9
Mein Auto: '02 Z3, 05 Jeep Wrangler
Quote:
Originally Posted by vintage42 View Post
Plastic radiators and fans have been the norm on vehicles for decades. They were probably selected for cost and weight, but not for premature failure, whatever that means. The soldered tubes and tanks of the old metal radiators often failed, too.
For the Z3 you can buy all-aluminum radiators, and solid steel water pumps. They cost a lot more.

The plastic pipe connectors from the engine to the heating system would be prohibitively expensive to reproduce in metal. The 4 and the 6 have a long connector pipe that would difficult in metal. And the 4 has a complex Y connector that has doomed many an engine.
Occurring or existing before the normal or expected time.
Reply With Quote
  #13  
Old 02-27-2019, 08:34 PM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,825
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Z3 freak View Post
Occurring or existing before the normal or expected time.
What is normal or expected? Is 20 years too short a time?
If/when you replace your radiator, will you buy a 20 year OE plastic Behr, or will you pay for an all-metal Mishimoto?
What modern car are you presently driving, and have you looked at its radiator materials?

Last edited by vintage42; 02-28-2019 at 08:53 PM.
Reply With Quote
  #14  
Old 02-28-2019, 09:52 AM
Mike Swing's Avatar
Mike Swing Mike Swing is offline
Mike Swing
Location: Austin, Texas
 
Join Date: Mar 2012
Posts: 404
Send a message via AIM to Mike Swing
Mein Auto: 2000 Z3M 2007 530i
I got a Stewart water pump about 3 years ago and no problems at all.
__________________
Mike Swing
Reply With Quote
  #15  
Old 02-28-2019, 08:51 PM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,825
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Mike Swing View Post
I got a Stewart water pump about 3 years ago and no problems at all.
Is that unexpected?
Reply With Quote
  #16  
Old 03-01-2019, 02:14 AM
Mike Swing's Avatar
Mike Swing Mike Swing is offline
Mike Swing
Location: Austin, Texas
 
Join Date: Mar 2012
Posts: 404
Send a message via AIM to Mike Swing
Mein Auto: 2000 Z3M 2007 530i
Quote:
Originally Posted by vintage42 View Post
Is that unexpected?
Nope. I just wanted to give my +1 for the Stewart water pump.
__________________
Mike Swing
Reply With Quote
Reply

See More Related BMW Stories


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2010 X5 3.0si, water pump went at 93k miles rpoitras X5 E70 (2007 - 2013) 5 11-09-2018 09:36 AM
Water pump version Gac79 X3 F25 (2011 - 2017) 7 05-02-2018 07:20 PM
BMW e90 water pump issue please help Mustafa95 E90/E91/E92/E93 (2006 - 2013) 15 04-10-2018 02:31 PM
Water Pump Thermostat issues 07 550i udawgsw E60 / E61 (2004 - 2010) 1 03-11-2018 11:02 AM
Water Pump recco's for '97 540/6 KenC-VA 5 Series 0 10-23-2003 04:01 PM


All times are GMT -7. The time now is 05:04 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
© 2001- VerticalScope Inc. All rights reserved.