Here is comparison of a stock wet clutch cover against one modified for oil lines like the 1983-or-so TT2, and the part listed by NCR as a modification they did. This part
may be one of those. Note the big plug inside the crank end oil galley; it appears the bronze bush was removed/reinstalled to do this, and the plug is certainly blocking oil from the interior case passage for the oil pump. It also beefs up that area for a banjo bolt, which is rather thin compared to the area of the outlet tap.
Notice that the small hole at the outlet tap/internal passage to the crank is not blocked. Maybe a bigger banjo bolt at this outlet would block that internal line, and the big plug then made not necessary. But this cover has only a 10mm bolt/tap in it. MikeV
Attachment:
IMG_0752.JPG [ 2.99 MiB | Viewed 2633 times ]
Attachment:
IMG_0753.JPG [ 3.23 MiB | Viewed 2633 times ]
Attachment:
IMG_0754.JPG [ 3.86 MiB | Viewed 2633 times ]
Attachment:
IMG_0756.JPG [ 3.24 MiB | Viewed 2633 times ]
Attachment:
NCR_prospekt_1.jpg [ 61.32 KiB | Viewed 2633 times ]