Same car. We removed the belt, and in this pic you can see we removed the fan so we could get the broken balancer bit off, and could then run the car, although with no alternator or water pump.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg