spur
you have something wrong in assembly.
you can see way more spur layshaft on motor side than there should.
images in manual show deep side spur edge in line with edge of shaft.
your photo shows a mm of shaft poking out.
i did mine exactly to images in manual and mine centered.
screws go into spur from same side as numbering for teeth count then is installed into car with numbers facing motor side.
some motors you have to put pinion grub on motor side as well.
tekin for one.