couple trivial questions about replacing a water pump - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Workshop

C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum.

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 10th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default couple trivial questions about replacing a water pump

I've never drained coolant on this car, but I do want to replace my water pump, so I guess I'll need to drain *some* of it. I found the drain plug on the bottom of the radiator not far from the battery and the major grounding point on the front cross-member. When you drain coolant, do you just open the drain plug and let the coolant splash all over the frame?? Or is there a hose you can put on the drain plug to direct it downward and avoid spilling coolant all over the frame?

For water pump replacement, I don't want to drain the whole cooling system, but how much drainage is enough?

Oh, and is it OK to install a Hepu (Germany) water pump instead of "Genuine Saab"? They cost half the money on eEuroparts, so I thought I'd ask about it.

Thanks.

Last edited by deniss; 10th June 2007 at 08:35 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11th June 2007
RickyS RickyS is offline
Saab Crazy
 
Join Date: Feb 2007                                                
Location: Cumbria UK
My Saabs: 1986 C900i 8v flat front
Posts: 710
Default

It would be a good idea to replace all the coolant, and flush the system when changing the pump, unless you have changed the coolant recently.

There is also a second drain plug on the engine block under the exhaust.
Reply With Quote Quick reply to this message
  #3  
Old 11th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default

Yea, the coolant flush was done several months ago, so I figured I'll get away with just draining enough to replace the pump for now - I don't have the equipment to deal with coolant-flushing the entire system.
Reply With Quote Quick reply to this message
  #4  
Old 11th June 2007
RickyS RickyS is offline
Saab Crazy
 
Join Date: Feb 2007                                                
Location: Cumbria UK
My Saabs: 1986 C900i 8v flat front
Posts: 710
Default

You have to drain quite alot out to get below the level of the pump.

You only need a hosepipe to flush the system!

Some pumps are not good quality - they do not have cast impeller.
Reply With Quote Quick reply to this message
  #5  
Old 11th June 2007
cdaly's Avatar
cdaly cdaly is offline
Moderator
 
Join Date: Dec 2003                                                
Location: Dublin, Ireland
My Saabs: '92 900LPT, '90 900i vert
Posts: 4,637
Default

If there's recent coolant in the system, use a hose on the drain plug and catch the coolant for re-use.
Reply With Quote Quick reply to this message
  #6  
Old 12th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default

Quote:
Originally Posted by cdaly
If there's recent coolant in the system, use a hose on the drain plug and catch the coolant for re-use.
Do any of you generally apply sealants when you do a water pump replacement job? Tom Townsend on his website recommends using a thread sealer on the two longer bolts, as well as Loctite #518 on both sides of the gasket... Does the Loctite work as the thread sealer as well?
Reply With Quote Quick reply to this message
  #7  
Old 12th June 2007
Albert Trout's Avatar
Albert Trout Albert Trout is offline
Saab Lunatic
 
Join Date: Jul 2005                                                
Location: Glasgow
My Saabs: Ehh....none
Posts: 2,996
Default

I replaced mine last year and didn't use any sealants and haven't seen any leaks at all. Didn't even consider it to be honest. Don't see that it would do any harm if you're concerened about it right enough. Just get the gasket wet before you put it on so it stays in place when you're putting the pump on.
__________________
MMmmmmmm. Juicy Fruit.
Reply With Quote Quick reply to this message
  #8  
Old 12th June 2007
philjohnhb's Avatar
philjohnhb philjohnhb is offline
Saab Lunatic
 
Join Date: Oct 2005                                                
Location: Cheriton, England
My Saabs: Black T16 'Carlsson' vert, 9-3 Aero Vert
Posts: 2,153
Default

I have just replaced mine - no sealant required.
__________________
Phil H-B My Carlsson Convertible Project Thread
Quote:
Originally Posted by Jim Mesthene
Other pieces of your car could fall off, if not bolted on.
Reply With Quote Quick reply to this message
  #9  
Old 12th June 2007
RickyS RickyS is offline
Saab Crazy
 
Join Date: Feb 2007                                                
Location: Cumbria UK
My Saabs: 1986 C900i 8v flat front
Posts: 710
Default

There should be a gasket with the pump. That is all you need. I use some Hylomar as well, but is probably not essential.

Loctite 518 is a flange sealant. It's generally used instead of a gasket, or where a gasket is no longer available.
Reply With Quote Quick reply to this message
  #10  
Old 12th June 2007
Banman's Avatar
Banman Banman is online now
Saab Lunatic
 
Join Date: Sep 2005                                                
Location: Ft. Collins Colorado
My Saabs: 91 900s turbo/ezk hybrid 97 9000 CSE
Posts: 1,769
Default

Replaced my pump a month ago with a junkyard unit so no gasket. I used a very thin coating of Locktite RTV (blue) on the flange. There has been no leaking after several 1000 miles. In general I don't use gaskets, just an appropriate flavor RTV...
__________________
Banman
'91 16vT
'97 9000 CSE
'75 IH Scout
Reply With Quote Quick reply to this message
  #11  
Old 12th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default

I'll definitely use the gasket that comes with the pump, and I did order the genuine Saab water pump - I have confidence that it should work without a sealant. Generally, I don't like using sealants unless necessary. I never used any sealant on the valve cover gasket, for instance, and never had any problems with it leaking.

I'm waiting for the water pump to arrive, and I'm hoping that getting the old seal out won't be too much of an ordeal...
Reply With Quote Quick reply to this message
  #12  
Old 12th June 2007
gorper gorper is offline
Saab Lunatic
 
Join Date: Aug 2002                                                
Location: US PNW
My Saabs: 86 turbo'd notch & 89T
Posts: 1,101
Default

Quote:
Originally Posted by deniss
Do any of you generally apply sealants when you do a water pump replacement job? Tom Townsend on his website recommends using a thread sealer on the two longer bolts, as well as Loctite #518 on both sides of the gasket.
He recommends this because it keeps the car from coming back to him later down the road with a leaking gasket. The 518 *works*. My favorite local Saab shop does this, too -- they put it on both sides of paper gaskets because it keeps cars from coming back. It's cheap insurance.
Quote:
Originally Posted by deniss
Does the Loctite work as the thread sealer as well?
Yes.
Quote:
Originally Posted by deniss
When you drain coolant, do you just open the drain plug and let the coolant splash all over the frame??
You can do it this way; just put a tub beneath the drain.
Quote:
Originally Posted by deniss
Or is there a hose you can put on the drain plug to direct it downward and avoid spilling coolant all over the frame?
Measure the drain O.D., go to Home Depot, and buy a few feet of vinyl hose from the plumbing dept.
Quote:
Originally Posted by deniss
For water pump replacement, I don't want to drain the whole cooling system, but how much drainage is enough?
Who knows -- half? 13/16ths? Just drain the radiator.
Quote:
Originally Posted by deniss
Oh, and is it OK to install a Hepu (Germany) water pump instead of "Genuine Saab"?
Hepu is fine; however, I have installed three of their pumps and they *all* have a high-pitched whine. I am the only one to notice -- my passengers would never know; it's subtle and you may not notice it. I have had one Hepu that had a flange that wasn't fit to the pump properly and the pulley wheel wobbled (replaced free under warranty). Laso is another decent brand.
__________________
TeamD Alcan 5000 Feb 16-26
Reply With Quote Quick reply to this message
  #13  
Old 12th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default

Great advices - thanks!

I got the hose already... And a nice clean bucket... Anyone know the liter capacity of our radiators, so I know how large a bucket to have handy?
Reply With Quote Quick reply to this message
  #14  
Old 12th June 2007
900t's Avatar
900t 900t is offline
Saabista
 
Join Date: Dec 2002                                                
Location: Montreal, Canada
My Saabs: 1989 900t, 1990 900t, 1990 900 S, 87 SPG
Posts: 18,323
Default

Quote:
Originally Posted by deniss
Great advices - thanks!

I got the hose already... And a nice clean bucket... Anyone know the liter capacity of our radiators, so I know how large a bucket to have handy?
10? That's total, most is in da block. You only need a few L unless you're changing coolant too (good idea)
__________________
Turbo allows the valiant who has appeared at the wheel SAAB to gain momentum for 200 km/h Charm SAAB Turbo also that it to you not bad Porsche on it it is possible with speed of pregnant turtle feeling itself in full comfort which by the way our hero obeys a rudder reliably and confidently the truth management hardly will twirl a steering wheel by one finger uneasy. Without the hydraulic booster quickly enough perishes a steering shaft, but to change its hemorrhoids from the most fierce
Reply With Quote Quick reply to this message
  #15  
Old 12th June 2007
Jim Mesthene's Avatar
Jim Mesthene Jim Mesthene is online now
Saab on the Brain!
 
Join Date: Feb 2006                                                
Location: Waltham, MA
My Saabs: Wife's 9-3
Posts: 9,956
Default

Even if you drain the radiator it's going to dump a bunch of coolant out when you remove the pump, unless you drain the block.
Because of that, many people don't drain anything and let it belch out the coolant through the water pump opening.
Most professionals glue the gasket to the pump for convenience and apply RTV for insurance.
__________________
Double your money back if my advice doesn't work!
Reply With Quote Quick reply to this message
  #16  
Old 12th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default

How about this: remove coolant from the expansion tank, disconnect the expansion tank, open the thermostat bleeder valve, and drain coolant from the expansion tank hose. This should take out whatever coolant is on the same level as the water pump, right?
Reply With Quote Quick reply to this message
  #17  
Old 12th June 2007
Jim Mesthene's Avatar
Jim Mesthene Jim Mesthene is online now
Saab on the Brain!
 
Join Date: Feb 2006                                                
Location: Waltham, MA
My Saabs: Wife's 9-3
Posts: 9,956
Default

It's easier, and more effective, to just drain the block.
__________________
Double your money back if my advice doesn't work!
Reply With Quote Quick reply to this message
  #18  
Old 13th June 2007
deniss's Avatar
deniss deniss is offline
Saab Lunatic
 
Join Date: May 2003                                                
Location: central NJ, USA
My Saabs: '08 9-3 Combi 2.0T 6-sp
Posts: 2,286
Default

OK, I got the old water pump off the car. It appears that whoever did this job before me just used the sealant without the gasket. I had some fun trying to scrape that stuff off the water pump housing using the knife blade. I'm not sure if I gouged the surface in some places while doing this, but I then used the very fine grid sand paper to polish that surface, and it looks as clean as it's gonna get.

I'm thinking though that I should perhaps use the Loctite sealant myself, just to make sure that water will not sip through any surface irregularities?

It appears that some of the bolts also had thread sealant on them - pretty much like Tom Townsend recommended. Should I go ahead and use thread sealer on them as well?
Reply With Quote Quick reply to this message
  #19  
Old 13th June 2007
gorper gorper is offline
Saab Lunatic
 
Join Date: Aug 2002                                                
Location: US PNW
My Saabs: 86 turbo'd notch & 89T
Posts: 1,101
Default

Quote:
Originally Posted by deniss
Tom Townsend on his website recommends using a thread sealer on the two longer bolts, as well as Loctite #518 on both sides of the gasket...
Put the 518 on. All will be right with the world. At least until the next time your car breaks down. But at least it won't be because of a bad water pump gasket.
__________________
TeamD Alcan 5000 Feb 16-26
Reply With Quote Quick reply to this message
  #20  
Old 28th January 2011
clarkandrew45 clarkandrew45 is offline
Junior Member
 
Join Date: Oct 2010                                                
Location: Unites States
My Saabs: None
Posts: 10
Default

Quote:
Originally Posted by deniss View Post
OK, I got the old water pump off the car. It appears that whoever did this job before me just used the sealant without the gasket. I had some fun trying to scrape that stuff off the water pump housing using the knife blade. I'm not sure if I gouged the surface in some places while doing this, but I then used the very fine grid sand paper to polish that surface, and it looks as clean as it's gonna get.

I'm thinking though that I should perhaps use the Loctite sealant myself, just to make sure that water will not sip through any surface irregularities?

It appears that some of the bolts also had thread sealant on them - pretty much like Tom Townsend recommended. Should I go ahead and use thread sealer on them as well?
Okay, i tried this replacement of housing using a knife, and its been hard for me. I know this was quite old, but im still looking for some alternatives aside from using the knife.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 Off

Forum Jump


All times are GMT -4. The time now is 11:35 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.