I replaced the timing belt and water pump on the '97 Prot?g? (1.5L with
chain drive between the cams). I read in a posting someplace of difficulties
breaking the crankshaft bolt loose. I had similar problems but want to share
my solution with anyone else who might need to do this.

After locking up the crankshaft (4th gear, flywheel ring gear...however),
fit a breaker bar with the 21mm socket to the bolt such that the arm of the
bar is somewhat horizontal. This should be positioned such that an upward
force is needed to loosen the bolt. The arm will point towards the front of
the car.

Position a scissors jack under the end of the breaker bar and extend it
upward, exerting rotational force on the bolt. This will break the bolt
free. Be careful of the jack or the arm of the bar slipping.

Best,

Ken