My starter drive gear thrust forward and engages the
flywheel but fails to
turn over the engine. Any of you more mechanically inclined
guys have a
guess as to what my problem may be? (It's a rebuilt
starter)

Jay


Can you turn the engine over by hands on the ring gear?
One rotor could be one tooth off on the phasing gear.
Make sure the right spark plugs are in there.

Put a  voltmeter on the brush connections.
If the starter wire is too small too much voltage
will drop across the wire.

Send a sketch of the wire sizes and a schematic on how
it is wired.

Paul Lamar

Jay

This info applies to a starter with the solenoid on top of the starter.

With a test light or a volt meter, test the large lug on the end of the solenoid which has a heavy wire going inside the starter and a good ground.  When you turn on the switch and the gear engages, you should have voltage on the large lug.
No voltage indicates the power contact inside the solenoid is not making contact and the solenoid needs to be repaired or replaced.

If full voltage (12 volts) is seen when the starter is engaged, then there is an open circuit inside the starter, probably a brush not making contact.  If there is a voltage drop, ie one volt or more, there is probably a short inside the starter or the armature or internal gearing is jammed preventing rotation.

See pages starting on G-19 for a complete description:

http://foxed.ca/rx7manual/manuals/1989FSM/05_Engine_Electrical_System.pdf

Joel