G15-CS primary chaincase help

This is a dumb question, but I can't find an answer in either of my Norton manuals or my Haynes. Can't recall from taking it apart and don't want to put together incorrectly.

What are each of the two holes in the center of the inner chaincase for? One is obviously for the alternator wires (top, if I recall), but what is the other? Is there a grommet necessary? I am assuming it cannot simply have an open hole there in a wet primary...



(And it seems to me the chaincase and drive side crankcase have been drilled for six fixing screws; assume that isn't standard. The spacer behind the chaincase is also not the stock piece, I think.)

Thanks very much! So close to having this on the road...

Mike

3 fixing screws are standard on the Atlas and P11 ..... it does appear the PO drilled some extras. In this case, more is better.

Is there a hole in the left engine side plate that aligns with one of the holes in the inner cover. If so, perhaps a fixing bolt goes there.

Slick

There are a spacer and thru-bolt that go between the engine plate and the inner chaincase, but they're already in place.

That's the nut visible below/right of the two central holes.

Thanks for the response!

Hmmm, theorizing the top hole is actually to be left unplugged, and the projection over it (and mating outer chaincase projection) plus the deep lip on the hole are meant to keep oil from splashing out. Then the wires are to pass through the lower hole.

Making the guess mostly on seeing the rubber grommet, which implies wires to me, in the middle hole in this photo:

Looks like it was a line to the oil tank, which the PO rerouted to a chain oiler through a pretty clever arrangement. I will keep that and blank out the hole with a screw or a rubber plug.

Thanks to Grandpaul for some help with that.

I have a 1964 n15. On mine, the upper hole is for the wire with grommet. The lower hole is to bolt the primary cover with an acorn nut.