[T3] distributor drive gear success

[Dave Hall]

With all this talk about #3 and #1 and small segment and large segment of
the drive, he hasn't been caught out by someone putting the drive dog the
other way round to clear the vac can, do you think?  There are some out
there who advocate that (wrongly).

Dave
UK VW Type 3&4 Club
===================

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: 01 May 2013 22:32
To: type3 at vwtype3.org
Subject: Re: [T3] distributor drive gear success

On 1 May 2013 at 11:31, ken2k wrote:

> yes, the key  bit of advice from chris was finding TDC by looking at 
> the valves on #3 and finding (apparently) the exact sweet spot. all 
> these years i thought TDC was the mark on the pulley. anyway, once i 
> was in the right spot it literally fell off the drive gear puller and 
> into position. i guess that means my valves have been off all of this 
> time. maybe now it will run properly. kk

Uhhh..., but you don't want #3 TDC, you want #1 TDC. If you set it to
#3 TDC you will have to stuff the SP wires in the dist cap rotated by 180
deg. Is this where you are, still?

You need to watch the #1 valves, then choose the TDC that comes up when both
of THOSE valves are closed, then install the drive gear.

If you think about it, and perhaps draw yourself some pictures, you'll
realize that, since this is a 4-cycle engine, each piston comes to TDC twice
in the 4 cycles. Since we're working on the spark timing, we're only
concerned about the TDC that occurs at the top of the compression stroke,
not the one that occurs at the top of the exhaust stroke, but that zero
degree mark comes by for each of those. 
The trick is to make sure you get the right one, and the right one is when
both valves are closed.

BTW, none of this will affect when your valves open and close. It only
controls spark timing. Valve timing is controlled by the gears that drive
the camshaft from the crankshaft. Those can only be changed with the engine
completely apart, so you have to hope they were set correctly when the
engine was put together. (They almost always are.)

--
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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