<VV> Erratic Tach with Crane/Allison Ignition

[Dan & Synde]

Hi Mike,

I have the Crane XR700 ignition on our Greenbrier but not the Safeguard
unit.  Never a problem with the tach up until about a month ago.  It is a
Spyder tach and I suspect that it is just old components causing the
problem.  We had an erratic Spyder tach in our Ultravan that drove me crazy
for months.  In the Ultravan we run an Ignitor pickup and a Safeguard unit.
Finally narrowed it down to a bad, original transistor in the tach.  I
replace the transistor, zener diode pair and several capacitors.  All is
well now.

Dan Kling

1961 Greenbrier Deluxe, 4spd, 3.89  On the Road Again,  yeehaw :)
1963 Spyder, restored   4spd Saginaw
1967 Ultravan #299  Newest of the herd!! Almost killed me already!!


http://www.flickr.com/photos/81412237@N00/sets/
A few pictures of the Greenbrier, UltraVan, engine and tranny tear down with
more to come! 

Mile said:

>I've installed a Spyder dash in the wife's Greenbrier. The van has an  
>Allison/Crane XR700 ignition + a Safeguard. The tach is erratic: tach
function  
>seems OK sitting still and revving the engine, but on the road at speed,
when  
>mashing the gas, the RPMs increase, in an unsteady manner,  dramatically.