Tony, I am not sure about your car but on W126 you do not have to take off the crank pully nut. There are six small bolts inside the main pully around the Crank bolt, If yplou take them off, the pully will slide out with couple of strikes of hammer or mallet. Once the pully is off, use either a puller or 2 pry bars in a rocking motion to take the Harmonic Balancer off. Do not forget to mark the degree dial and belt pully position.

Hope this helps

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87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)