No special tools needed, but on the W123s and W126s be careful of the spring clips that hold the radiator to the core support and the fan shroud to the radiator. I don't know how, but one of them almost popped me in the eye once and that would have been painful and probably not good for my vision.

Rick

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)