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Re: [TR] TR4A - First Breakdown Update

To: "G.D. Huggins" <guy@genfiniti.com>, "triumphs@autox.team.net"
Subject: Re: [TR] TR4A - First Breakdown Update
From: Frank Fisher <yellowtr3@yahoo.com>
Date: Fri, 24 Feb 2012 09:13:16 -0800 (PST)
Any clue why a rotor would break? china?
 
Frank
________________________________
From: G.D. Huggins <guy@genfiniti.com>
To:
triumphs@autox.team.net 
Sent: Friday, February 24, 2012 8:56 AM
Subject: [TR]
TR4A - First Breakdown Update

All,

I have the final update from my first
breakdown some weeks back.

As a reminder, I was on the highway coming up on
some slower traffic.
So, I turned off the OD, changed lanes, got back on the
gas then BANG.. a loud
noise and no revs.
I got it towed home and began
troubleshooting..

Car would start, but ran super weak.  Giving it any
throttle would kill it.
Fuel looked good.
Spark looked good.

So, I checked
the timing, and sure enough, the dizzy rotor was way to the
right when #1 was
TDC.
It is supposed to be "pointing" directly at the #1 plug hole.
So, I have
a mechanical issue that is causing the spark timing to be way
behind..

My
theories were a) timing chain jumped, or b) dizzy gear jumped..

Turns out
both were wrong.

What happened was that the rotor broke, which gives me mixed
feelings.
I am happy that it turned out to not be a jumping issue, but angry
because the
dizzy is a brand-new Pertronix dizzy I got from Moss, with just
1000 miles on
it, and it seems a bit too early for it to have issues.

Any
clue why a rotor would break?  Something tells me to check for vibrations
in
the dizzy shaft.
I am going to return to the original point dizzy just for
giggles as a
comparison.

Any thoughts??



Cheers,

Guy D. Huggins
1965
Triumph TR4A
CTC 63569LO

Online project diary at
http://www.genfiniti.com/triumph

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