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Here is a picture off Schwany's thread showing the P11 inner primary cover . By the time the P11 went into production, production of the G12 had stopped. AMC (or NV Matchless Div. as it was named by now) could freely modify the mold for the die casting, so they plugged the hole which served as a vent on the G12.

As for Schwany's theory of a cause for a possible oil leak, it will probably not manifest itself unless the primary cover is overfilled. By using the correct amount of oil, the lower chain run will barely dip into it and subsequentlt the oil will be thrown to the rear of the chaincase where it drains down and flows forward agein. A small fraction will drip on the deflector above the hole in question, but will drain forward and away from it (as can be seen, the factory enlarged the deflector). So, I think the main reason for wanting to plug the hole in your G15 inner cover is to prevent dust and road debris from entering the chaincase.

[ATTACH=full]105028[/ATTACH]

- Knut

<blockquote data-quote="mdt-son" data-source="post: 619917" data-attributes="member: 3823">Here is a picture off Schwany&#039;s thread showing the P11 inner primary cover . By the time the P11 went into production, production of the G12 had stopped. AMC (or NV Matchless Div.&nbsp; as it was named by now) could freely modify the mold for the die casting, so they plugged the hole which served as a vent on the G12.&nbsp; As for Schwany&#039;s theory of a cause for a possible oil leak, it will probably not manifest itself unless the primary cover is overfilled. By using the correct amount of oil, the lower chain run will barely dip into it and subsequentlt the oil will be thrown to the rear of the chaincase where it drains down and flows forward agein. A small fraction will drip on the deflector above the hole in question, but will drain forward and away from it (as can be seen, the factory enlarged the deflector). So, I think the main reason for wanting to plug the hole in your G15 inner cover is to prevent dust and road debris from entering the chaincase.[ATTACH=full]105028[/ATTACH]- Knut</blockquote>

[QUOTE="mdt-son, post: 619917, member: 3823"] Here is a picture off Schwany's thread showing the P11 inner primary cover . By the time the P11 went into production, production of the G12 had stopped. AMC (or NV Matchless Div. as it was named by now) could freely modify the mold for the die casting, so they plugged the hole which served as a vent on the G12. As for Schwany's theory of a cause for a possible oil leak, it will probably not manifest itself unless the primary cover is overfilled. By using the correct amount of oil, the lower chain run will barely dip into it and subsequentlt the oil will be thrown to the rear of the chaincase where it drains down and flows forward agein. A small fraction will drip on the deflector above the hole in question, but will drain forward and away from it (as can be seen, the factory enlarged the deflector). So, I think the main reason for wanting to plug the hole in your G15 inner cover is to prevent dust and road debris from entering the chaincase. [ATTACH type="full" alt="P11 primary.png"]105028[/ATTACH] - Knut [/QUOTE]