I looks closer at the broken bits and noted that the outer edge of one
of the dog ears was well polished and that metal had flowed, like it
rubbed on something. Looking at the inside of the pedestal that
houses the drive gear, I can see that there was rubbing inside it. I
now suspect that the piece of the ear rubbed along the inside. This
is a cast part and the inside is not very smooth. I think that some
of this material fell down into the gears, which caused the failure of
the driven gear. This so far is all that I can figure, as I have not
found any other explanation. The mystery continues. Joe(B)
----- Original Message -----
From: "jaboruch" <jaboruch@adelphia.net>
To: "Friends of Triumph" <FOT@autox.team.net>
Sent: Wednesday, May 07, 2003 8:07 AM
Subject: NHIS Race Report and....
> So far the suggestions from the list about the failure of my
> distributor driving gear (the gear that drives off of the cam shaft)
> have pointed to the oil pump. The suggestions were that either the
> shaft was bent or that the rotors jammed. Another suggestion was
that
> the cam bearings may be too worn and that has allowed the gear mesh
to
> be too far off, and yet another was perhaps drag in the valve train.
>
> I pulled the oil pump last night and it looks great. (I was hoping
> that the pump was it, so that I could have a definitive cause of the
> problem) Shaft is straight, rotors fine and clearances good. I
have
> not pulled the cam yet.
>
> When I found the broken tangs on the distributor dog drive
previously,
> it looked like a clean break and I retrieved the tangs that were
still
> in the slots. Maybe a chip had fallen into the gears and that
caused
> the failure? Or a piece of the broken roll pin (that holds the dog
on)
> fell in? One of the teeth has a big dent on the back side of it,
> looking like something was in there, or it originally had a void in
> it. The gear was an original old part.
>
> Thanks for the suggestions. Joe(B)
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