MK3 Anti Backfire Device Shaft Sealing

I purchased a pristine MK3 way back in '94. The prior owner removed the starter, anti backfire shaft assembly and a few other related peripherals but were kind enough to include all in my purchase. I am now reinstalling these items for the first time. When they removed the starter they removed the anti backfire shaft assembly and this left a hole in the inside of the inner primary which they neatly plugged with brass. I will extract this plug and reinstall the anti backfire shaft in the hole. My question is this: What will prevent this shaft from leaking oil? There appears to be no provisions for a seal / o-ring . Is a sealer used or is the fit typically snug enough to prevent seepage.

Image provided shows that A will be inserted into B once the plug is removed. How to seal?

I'm a tad confused but my exploded diagram shows very little help here. I think it's a blind end that can't leak to the outside of the inner primary cover. :?: Ref no. 4 of inner primary , 06-4727 Plug, Welch or sealing could be what we are searching for. :shock:

Torontonian said:

I'm a tad confused but my exploded diagram shows very little help here. I think it's a blind end that can't leak to the outside of the inner primary cover. :?: Ref no. 4 of inner primary , 06-4727 Plug, Welch or sealing could be what we are searching for. :shock:

Click to expand...

Yes, the drilling needs blanking off (with the 06-4727 welch plug) or it will leak, as it's outside the gasket area.

https://andover-norton.co.uk/en/shop-dr ... tensioner#
Item '4'.

Thanks to both of you for your prompt and accurate reply. I also suspected a welch plug but was not convinced because, as you saw, the parts book showed a welch plug only in the general vicinity. The photo of the inner primary inclusive of the welch plug has confirmed. Again, Thanks to both of you for your replies! I'm sure you both understand how an issue like this can consume a man....... I now rest.

Yes rest . The stress is over. Ride on. 8)