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RE: Checking Distributor Vacuum Advance

To: <triumphs@autox.team.net>
Subject: RE: Checking Distributor Vacuum Advance
From: "Randall Young" <ryoung@navcomtech.com>
Date: Wed, 3 Dec 2003 09:01:14 -0800
> What's the best/easiest way to verify operation of the vacuum
> advance on a
> TR3A distributor?

Probably the best way is to disconnect the line, hook up a timing light,
start the engine, then watch the timing mark as you apply vacuum to the
advance module.  I use a MityVac.

However if you don't have a ready source of vacuum, you can just suck on the
port.  If it doesn't leak, it's probably OK.

> Can the diaphrams be replaced or repaired?

Takes special equipment to do it, but I was able to have my local
independant parts supply house send the module out to be rebuilt.  ISTR the
price was about $30 (although that was a few years ago), and it took 3 days.
Even came back with the right compression fitting, even though they replaced
the part with the fitting on it.

> And what's that giant sucking sound I hear each time I tromp on the
> accelerator?  NAFTA?

Either that or the air rushing into the carbs.  A set of K&N's with some
good velocity stacks will cut down on it ...

Randall




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