Northstar Waterpump Replacement – Mechanics Tools
September 14, 2008 9:18 am Apprentice Auto Tech, Automotive Specialty Tools, Mechanics Tools
Northstar water pump replacement, not so bad with correct mechanics tool
This automotive tool blog features a specialty auto mechanics tool for changing the Northstar water pump. The Cadillac Northstar water pump is located at the rear of the engine. As the picture shows, there is a belt cover over the water pump drive belt at the rear of the front valve cover. The special mechanics tool required for this job used to be only available in more expensive specialty tool brands like Schley Products. If the tool is to be used frequently, the more expensive version of the specialty may be the best choice. If the mechanic only changes a few of these a year, the Lisle Northstar mechanics tool will work just fine.
Remove the air cleaner to access the water pump
Mechanics tools make life easier, in fact without this specialty tool, replacement is simply is not possible. First access the water pump by removing the air cleaner housing and swing the ECU (Electronic Control Unit) out of the way. Remove the water pump drive belt cover and belt. The water pump fits inside the coolant housing.
Access by securing outer coolant housing out of the way
Auto Tools required up this point are everyday, common auto mechanic tools that most mechanics will already have in their tool box. Of course the spring hose clamps can be removed much easier with the correct hose clamp tools as opposed to regular pliers. The professional auto technician more than likely already has a nice set of Mayhew hose clamp tools.
Northstar water pump revealed
This Waterpump tool is only used on the Northstar. The water pump is a twist in design. The Northstar water pump socket slips in around the waterpump and catches the tabs. A simple twist and the water pump comes out. Be sure that the old o-ring seal is removed. The rubber seal comes out easily, and the good thing is there’s no gasket scraping needed for the water pump itself. Gasket removal is needed for many other water pumps, but this one has a removable seal and it is easy to access. If there is any corrosion build up on the housing this should be removed. Gluing the new seals in place may be necessary to hold them in place for installation.
Lisle waterpump tool use
Water-pump Removed
Automotive specialty tools like this makes certain jobs a piece of cake. Without this specific mechanic tool, the tech finds himself down the creek, well you know the rest.
Jr 2000 Deville :
Date: January 26, 2009 @ 10:34 pm
I changed my water pump on a 2000 Deville. I read a torque spec (75 ft. lb.) in another posting but noticed my clicker torque wrench does not work in CCW, which is how you tighten the pump. After putting it together several times and having leaks each time, I realized the dog ears on the pump must be fully engaged with the housing stops. I am sure it required more than 75 ft. lbs. If I had to guess, it was closer to 100 ft. lbs and I thought the housing would break, but of course it didn’t break. It took a lot of torque to seat the damn thing. Anyway, after all that, my pump still had a slight leak and I ended up adding bars leak that is compatible with Dex cool. Good luck. It is worth a little frustration to save the $400 +.
dennisb - Auto Tool Sales :
Date: January 27, 2009 @ 7:26 am
Some of the most important things is to:
1. Clean all corrosion from mating surfaces.
2. Glue gaskets in place so they won’t move during installation.
3. Make sure new water pump is in the same clock position as the old one when installing.
4. I don’t think of it as tightening the water pump – I think of turning it to lock it in place. A little pressure inward helps to engage the tabs while turning.
5. Try to avoid using any type of Stop Leak. Stop Leak will sometimes clog passages in radiators and heater cores. And some people think that if one application will stop a small leak…then two will stop a larger leak. This is a case when more isn’t better!
Gary Colageo :
Date: May 4, 2009 @ 6:56 pm
Does anyone have the exact ORING for the waterpump available separate (without buying the waterpump) for my car (97 Cadillac Deville Concours engine code 9) without having to match it up approximately with an ORING that will work.
Gary Colageo
bsee2000@gmail.com
Greg Kelly :
Date: May 6, 2009 @ 2:02 am
Thanks Sooo !!! much for the help. I am very happy to come across this web site/blog.
dennisb - Auto Tool Sales :
Date: May 6, 2009 @ 7:05 am
Gary, The dealer may be able to order just the waterpump o-ring, but I would recommend replacing the water pump (which comes with a new o-ring). The labor involved in my opinion is too much to just replace the o-ring.
frank :
Date: September 5, 2009 @ 1:03 pm
2000 northstar pump does not leak and turns with smooth rotation 175,000 miles do you think pump is bad.
dennisb - Auto Tool Sales :
Date: September 5, 2009 @ 2:43 pm
Frank, Usually the water pump would leak, have a bearing start to bind, or lock up indicating it’s bad. The impeller can sometimes erode or come off the shaft altogether which would keep it from pumping. For test purposes, I would take the upper radiator hose loose (from the radiator) and stuff a shop rag in the radiator connection port. While keeping the radiator full and running the engine, (when the thermostat is opened) as long as it is pumping water out of the hose, the pump is working. (I used to flush cooling systems that way back in the 1980’s and 90’s) If water doesn’t pump out of the hose and the temperature starts to show the engine is overheating, the pump’s impeller could be off the shaft or eroded.
lee :
Date: September 22, 2009 @ 9:16 pm
Bought the tool for changing the water pump. How do you hold the belt drive pulley (lock it up) for the water pump so you can apply pressure to break free the impeller assembly? Also what way is it threaded, right or left? Don’t know when I am turning the water pump too lif I am tightening or loosening it?
dennisb - Auto Tool Sales :
Date: September 23, 2009 @ 6:19 am
Lee, If an impact gun is not available for removing the belt pulley bolt, then holding the nose of the pulley may be needed to break the bolt loose. It’s been awhile since I’ve personally changed one of these water pumps, but the tangs on the water pump indicates that you would loosen it to the left (counter-clockwise). If you need further assistance from a Cadillac tech feel free to visit our car qusetions & answers page, usually there’s a technician available that specializes in different makes.
tim :
Date: February 11, 2010 @ 12:06 pm
im doing mine right now, update u guys later
Paul :
Date: February 17, 2010 @ 4:28 pm
The water pump on the northstar engine has reverse threads. tighten to the left…loosen to the right or clockwise
dennisb - Auto Tool Sales :
Date: February 17, 2010 @ 10:02 pm
Paul, thanks for the clarification. It’s been awhile since I’ve changed one.
Erick :
Date: February 28, 2010 @ 8:41 am
I wish I found this web blog a couple of weeks ago because I would already be done repairing a coolant leak around the waterpump housing. I just ordered the socket tool to remove the water pump and look forward to finishing the job.
Erick :
Date: February 28, 2010 @ 8:48 am
Question??? In my attempts to remove the water pump manifild to get to the water pump…(don’t ask as it is a long story) I removed the throttle body. I inspected the intake manifold and saw a pretty large build-up of oily residue and puddles of liquid setting on the bottom of the intake runners. Is this normal? Should I remove the intake manifold and clean it? If so what do you reccomend I use to clean the residue. What is causing the puddles?
Clive Moxey :
Date: June 19, 2010 @ 12:06 pm
You do not need a special tool for this so follow my advice as I have just replaced one. Follow all that you have read on this site. Use a pry bar to rip out the impeller (this now exposes the clip area of the pump) use a large screw driver to unlock the pump (clockwise. Do the opposite to install however I used a 3/8″ drift as it will not do the damage that a screw driver does. Two things to note–there is an exact location of the positioning of the pump so take note of this upon removal, I also had to file a lead on the new pump as I could not get it started. I worked fine after this with no cost involved.
Lucky Herb :
Date: July 9, 2010 @ 9:43 am
Guys , Let a good Mechanic tackle the job . To save $$ doing it yourself will only cost you in the long run , To think I could just look at the water pump location and think I could change it myself , getting the parts off just to get to it , no way , use a mechanic , spend a little flush the system , get your warrenty on it and be happy that you don’t end up with a car in the driveway for months $100 for water pump , coolant , thermostat , $400 for labor , let it happen .You are are going to save headaches which is more important !!!!
auto bearing service :
Date: July 20, 2010 @ 3:33 pm
Did you say good mechanic?
few people do that plus auto bearing service.