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TJ Water Pump Replacement



Here is the business end of the the removed water pump.  If you look at the top fin, you will see the letter "R" stamped into it.  This means it is a reverse rotation water pump.  One would want to ensure that the replacement is the same.  Having the fins configured in the opposite direction would cause poor (no?) cooling in your vehicles engine.



I have just unscrewed the heater hose tube from the old pump.  As you can see, there is some kind of red thread sealant on it.  As I said before, I used teflon tape on this, after cleaning it carefully with a wire brush.  Scott's new pump did NOT come with the studs for mounting the fan assembly.  We had to remove the studs from the old pump and transfer them to the new pump.  As neither of us had a stud puller, we used the good old double nut trick to remove them.  Screw a nut onto the stud and then put another one on right after it.  Using two wrenches, tighten the two nuts so they jam into each other.  Now, use one wrench and remove the stud as though it were a regular bolt, from the pump.  You can install them using the same technique.

Next came the cleanup of the old gasket material on the engine block.  Take your time and do a good job.  Since this was Scott's project, I let him scrape the old gasket junk off.  He put a couple of paper towels into the engine block opening to help prevent the debris from getting inside the water jacket.  This stuff would certainly plug the core tubes in the radiator and you don't want that to happen.


Here is the new water pump.  Note the manufacturer has pop riveted a piece of sheet metal to the vanes on the pump, making them more efficient.  Be sure to follow any specific directions that come with the pump.  There were some included with this one that dealt with the gaskets. 


With everything cleaned and ready to go, you basically reverse the disassembly order.  Here is Scott tightening the belt tensioner before the fan assembly was put back on.  It is much easier to adjust it now then after the radiator, shroud, and fan are also back in place.

As always, be sure to consult the service manual for the properly torque specs on the various bolts you wrenched on.  Some of them don't take very much umph!  The last thing you want to do is snap one off in the block!  DOH!

After all is back together, take some distilled water and mix it with your favorite brand of coolant at the appropriate percentage (your choice on what is right for your climate).  After running the vehicle for about 5 minutes (with the radiator cap in place), I carefully opened the temp sensor.  Scott said I should see some air bubbles when I did and sure enough, it burped a couple of times.  He said this helps get the air out of the water jacket and prevents hot spots in the engine. 




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