download section 1 of the '88 Samurai Factory Service Manual at Ack's FAQ (search
fsm and study section three. If your '93 is an 8-valve, this info should apply.
For a 16-valve, do a search for
Tracker fsm and take a look at the engine section.
(oh, the link to Ack's FAQ is in my signature, below
)
Either way, it is VERY IMPORTANT that you are careful when removing the bolt on the end of the crankshaft that holds the crankshaft timing belt in place! This bolt is only removed if you are replacing the oil pump or the front crank seal.
You may need to apply heat to cause the factory locktite to properly release before removing this bolt. This bolt must be properly torqued down (replacing it would also be a good idea!) or severe damage may be done to the end of the crankshaft.
If you feel uncomfortable with that process, you can still change the timing belt and water pump by removing ONLY the crankshaft accessory pulley by loosening the five smaller bolts that attach the crankshaft accessory pulley to the crankshaft timing belt pulley. The pictures in either the Samurai fsm or Tracker fsm will help explain this.
Also, take a look at this recent thread here at zukiworld.com on this topic:
http://www.zukiworld.com/forum/index.php?topic=24925.15I hope that this helps!