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Thank you for your reply. But it appears that the hole will not be covered by the bellhousing because it lines up with the "recess in clutch housing" (Figure 72-73, Flywheel Housing on Cylinder Block, page 72-38 in the 1971 Opel GT Service Manual). The small hole can be seen in Figure 72-119, Exploded View of 1.9 Engine Transmission (page 72-54, same manual) just above the top of the transmission to clutch housing gasket on the drawing. It would appear that the Main Drive Gear to Clutch Seal Ring would prevent any oil from entering the bellhousing and subsequently the clutch surfaces. But what is its purpose and would plugging it cause a problem?
Denny
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