Do you have a diagram on how to change the timing belt on a 1996 Mazda B2300?

Put engine piston no.1 on its compression stroke/TDC and align the cam and crank sprockets as indicate below and the repair manual

Here is a guide

https://www.2carpros.com/diagrams/mazda/b2300/1996

These are the instructions

REMOVAL & INSTALLATION
TIMING BELT

Removal
Disconnect negative battery cable. Ensure crankshaft is set at TDC and camshaft sprocket timing mark is aligned with cover pointer. See Fig. 1 . Disconnect negative battery cable.
Drain cooling system and remove upper radiator hose. Remove alternator. Loosen water pump pulley bolts. Remove accessory drive belt(s). Remove spark plugs to ensure belt does not jump time during rotation.

Remove cooling fan and water pump pulley. Remove crankshaft pulley, hub and belt guide. Remove crankshaft position sensor. Remove dipstick and pipe. Remove timing belt cover retaining bolt. Release 8 cover interlocking tabs. Remove timing belt cover. Loosen timing belt tensioner pulley bolt. See Fig. 2 . Pry tensioner away from timing belt, and tighten bolt to hold tensioner in place. Remove timing belt.

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken