nobody has answered so I will make a guess. I have a 39 Century and it can be removed without removing the radiator. But then its not a 40 or Limited, but as I recall the 40 looks like it had a little more room than my 39, it wasnt real easy but I did remove and replace my water pump without moving sheetmetal or rad. Remove all hoses and then the fan, a ratcheting closed wrench may help. Remove pump out whichever side looks easier. [be very careful of radiator damage when moving pump and fan out. see reference from 52 Buick manual for additional info its similar in general to earlier Buicks.
good luck
http://www.teambuick.com/reference/l.../files/2-f.pdf
[http://www.teambuick.com/reference/l.../files/2-f.pdf ]
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