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They often come of hard with just a wrench. The best way is to have the serpbelt installed on the engine to help hold the water pump pulley from turning. I sometimes use a air hammer with a chisel bit to pound on the nut in the direction to loosen it up. They also make a nice tool that goes in a air hammer with a open end wrench on the other end for easy removal.
2005 GMC Serria CC, radix 2.80 pulley, upgraded J tube and 90mm throttle body,outlaw intake,dyatech supermaxx long tube headers with high flow cats, corsa cat back, FLT 4L65E level5 tranny with Vigilante 2800-3000 rpm converter 22x9" Stingray III and a 5.7L engine built by Rex with WCCH stage 2 LS1 heads Best E.T. 12.58@104 http://i172.photobucket.com/albums/w...truck120-2.jpg
Use what there telling you...but if GM corss threaded it on like they did to my clutch fan....Then your gonna need a BFH and a strap wrench. Wedge strap wrench to water pump and dial the basterd off...
I used the removal tool that works w/ an air hammer and i think it took all of 3.5 seconds to get it off
2003 Chevrolet RCSB--->LQ9 6.0L, Comp 226/232 111, LS6 Intake, Yella Terras Pacesetter LT's, ORY, E-Fans, True flow CAI, Butch's Trans. and Auto (Dickinson, TX) Built 4L60E, Yank SST 3200!, Detroit Tru Trac, 4.10s....and a HSW plate kit