[Mgs] bad cam diagnosis

[Aaron Whiteman]

On Feb 17, 2013, at 7:36 PM, Barney Gaylord <barneymg at mgaguru.com>
wrote:

> 
> Holy crap.  It must have wiped out the dizzy drive gear and the oil
> pump drive gear in a similar manner.  You're lucky it didn't lose oil pump
> drive before losing distributor drive, in which case it would destroy
> crankshaft and con rods.
> 
> I have not personally seen this before, but apparently it happens
> occasionally.

I took the cam to my local mechanic today. He was suitable horrified.
But one of his guys asked me if there was an oil passage. The thinking
was perhaps it wasn't getting oil to the gear, but the rest of the cam
was being fed well.

So of course google refers me to mgaguru (should have just started
there).

  http://mgaguru.com/mgtech/engine/of101.htm
and
  http://mgaguru.com/mgtech/engine/of101a.htm

If my understanding is correct, the cam lobes and drive gear are
lubricated by oil falling down through the head via the pushrod
passages from the rocker arm assembly. But the second article notes an
additional passage to feed the gear. How does that passage get fed?