As ardi says the triangular section plastic ring is important, especially if the locking spring got a little deformed from the removal process. make sure it's the right way round. As you are going to have to remove that bloody box again and you have already successfully removed the locking spring once, why not try engaging the release bearing by hand without the gearbox. Assemble it all and just push it into the spring cover by hand. it should push in really easily, produce a fairly quiet click and then be impossible to pull out again. If there is a problem release bearings can be bought separately; sometimes the ears get bent and twisted and can fracture. The locating rings only come on with the clutch spring plates however.So if that's damaged you may have to buy a new clutch. Although I asked on here and someone who had just changed his clutch was kind enough to send me his old one and it's worked perfectly. This really is a great forum for people helping each other out.
When you are replacing the box make sure once you've engaged the shaft arms with the release bearing arms that you keep the clutch arm pushed as far towards the engine as you can till the bell housing is virtually in place as there is enough movement to allow the two to dissengage and the shaft arms to get on the wrong side of the bearing ears in which case it will push the bearing home ok but be pulling nothing when you try to use the clutch.
I should also say that although it isn't as easy on the Deisel as the V6 -where a little window is placed in the top of the bellhousing to allow you to see what's happening - it is possible to engage the clutch arm into the release bearing with it already in place in the clutch cover if you really need to.
Position the release bearing with it's ears at 6:30 and pull the clutch arm back as far as possible towards the gearbox.( The slave cylinder has to have been withdrawn from its bracket by removing the circlip ) slide the gearbox on until the clutch arms hit the spring cover and slowly move the arm forward as you slide the gearbox further on and the arms will more often than not engage in the release bearing ears; you can tell if it's worked because you then have the added bonus that pushing the clutch arm further will help to pull the gearbox the final few centimeters onto the studs.
Infamy, Infamy, They've all got it In For me!
Last edited by Yorkshirekeith; 10-08-15 at 09:39.