Mondail - no reverse

Before you panic, look inside the gate and see if you dropped a coin or something in there that's preventing the lever to go all the way over.

It sounds like some kind of timing problem of the linkage to the gearbox. I don't believe it's a gearbox problem.

 

Sounds like your "silent bloc" bushings (#28) might need replacing.
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Definitely check all the linkages and bushes (blocks) as the others have suggested --- making sure no foreign objects are blocking the gate mechanism is a good idea, too.

If that all checks out okay, then you'll have to start suspecting an internal gearbox fault. Here's why )

Reverse and 1st gears are engaged by the same selector fork in the gearbox, and moving from 1st to reverse is a straight throw (no rotation) for the linkage. This generally means that if the linkage is at fault, you can't select 1st AND reverse ---- conversely, if you can select one, you should be able to select the other as well, so........

Do this check )

With the car running, select 1st gear, and confirm that it engages the gear (the car goes forward). Then shift into "neutral". Confirm that you are actually in neutral (car sits). If you can do this, proceed to shifting directly from 1st into reverse (obviously, make sure the car is not rolling forward when you try to select reverse !). If 1st gear engages, but reverse does not, you may very well have a problem with 1/R selector fork inside the gearbox ---- only way to tell is to drain the gearbox oil, pull the pan underneath, and have a look inside.