[Vwdiesel] TD Injection Pump locking hole/Tachometer

[Milton Kaplan]

Thanks, Christian. Apparently the 86 Jetta TD injection pump sprocket
just has one hole meant for the alignment pin. Its funny we are talking
about the best socket tool to use which has nothing to do with fitting a
nut! Its interesting that outside dimensions of different companies tools
vary. I'm actually not timing the injection pump but using the sprocket
as part of a design for adding a tachometer signal.

In Roger Brown's Tachometer signal design for diesels,
http://4crawler.cruiserpages.com/Diesel/CheapTricks/Tachometer/index.shtm
l, a round cover plate inside the sprocket was used to reflect an
infrared signal back to a sensor circuit to drive a tachometer. Instead
of the cover plate, I'm going to try using the outside sprocket rim to
reflect the signal; put on some flat black paint and glue on 4 sections
of aluminum foil or mylar tape. Sensor Alignment may be a bit more tricky
as the rim is only about 3/16 inch wide. Should be enough to reflect the
signal though.

> The 7/16, 1/4" drive Craftsman socket does indeed fit, however, I've
> found that using a 1/4" drive older style Craftsman 11mm deep
> results in an
> even tighter fit.  There's less than .005" slop.  25 years ago, I
> took
> that socket out of circulation, and keep it for setting injector
> pumps.
> I don't have a loose pump sprocket hanging around, but if you want,
> I could
> at least mic the socket.  Advise if you want me to do so.
>
>
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> vwdiesel at vwfans.com
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>


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