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Posted by: tomeric914 Mar 20 2011, 10:36 AM

Working on the /6 conversion last night and just happen to look at top of the transmission and see this little plug sitting there next to a similar size hole. My first reaction was one of "WTF is this?" My second was, "How long has that that little plug been there and how have I not lost it?"

Anybody have a clue what this is and how it popped out? I could stick it back in but it'll probably just pop out again. Probably better to tap and plug it.

Posted by: windforfun Mar 20 2011, 10:52 AM

Breather port?

Posted by: tomeric914 Mar 20 2011, 10:54 AM

No, that's on the other end of the transmission.

This little plug and hole is on the top of the intermediate plate.

Posted by: Dr Evil Mar 20 2011, 10:57 AM

???

Clean it and the hole up and maybe it will be more clear.

Posted by: tomeric914 Mar 20 2011, 11:50 AM

Ok, now cleaned up and a few more views. The "plug" isn't a tight fit in the hole but definitely looks like it came from there.

The hole appears to be counterbored like a plug was supposed to go in there. Maybe there's supposed to be a pin or spring in that bore?

Here's a few more shots. One backed up so you can see where it is on the case.

Posted by: 9146986 Mar 20 2011, 12:01 PM

Looks like PO mistake to me.

Posted by: Cupomeat Mar 20 2011, 12:07 PM

VEDDY EEENTERESTING TOM!

Does that intermediate plate look like aluminum? Or Magnesium...

My first thought was that it was drilled for trans cooling/recirculating/spraying of oil, but that seems like an unusual place, unless it hits directly over the input shaft bearing.

Posted by: underthetire Mar 20 2011, 12:09 PM

Looks like a cross drill hole for something internal, factory probably plugged it. Pretty common on castings of all sorts, like the oil galley plugs.

Posted by: Dr Evil Mar 20 2011, 12:39 PM

Looks like a mistake Never seen one of those.

Posted by: jmill Mar 20 2011, 01:21 PM

Maybe it's just trying to make a statement?




Attached image(s)

Posted by: KELTY360 Mar 20 2011, 01:33 PM

That's where the little people leave their home on the way to tend their rust farms.

Posted by: tomeric914 Mar 20 2011, 02:55 PM

Magnesium, but I know where you were going with that.

Posted by: 9146986 Mar 21 2011, 08:02 AM

There is/was a aftermarket intermediate plate.

Posted by: flipb Mar 21 2011, 08:10 AM

Posted by: r_towle Mar 21 2011, 09:31 AM

Probably a mistake that he plugged and the internal pressure was enough to pop that plug.
JB Weld

Rich

Posted by: tomeric914 Mar 21 2011, 01:43 PM

Yea, it is interesting because the hole is neat and clean, not like someone drilled it (at least not half assed) and there's a step to it. A PO drill job would have gone right through without stopping, I would think.

I was able to get enough purchase with a 6mm tap to thread the hole. I'll use a threaded plug with loctite to seal it up.

I also checked the main breather and it was clear.