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Q: how do i replace the water pump in a 1994 buick lesabre on 1994 Buick LeSabre

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The motor mount is in the way
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first off spray "all" bolts on the motor mount..4 on frame,2 are visible 2 are underneath out of sight...4 bolts and 1 nut are on the block,make sure you have the right rachet's some of the access to block bolts are very VERY tight and can frustrate very easily seeing as the mount has been on for 17 plus year's.To remove the serpentine belt I placed an 11/16 socket on the center bolt and lifted it to relieve the tension while taking the belt off of the alternator pulley with the other hand......prior!!! to removing the belt take the 4 blts out of the hub that attaches to the water pump itself(you may have to take the belt off and rotate the hub to gain access to all bolts then replace belt so as to keep hub from spinning while you take last bolt off.)will continue with the rest ...running out of room...11-3-2011....
You must support the engine and remove the mount to gain access. Be VERY careful and be SAFE when doing this so you don't have the engine fall and break a finger or worse!!
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