[T3] A Hint...

[Jim Adney]

On 9 Sep 2018 at 4:13, J. Jonik wrote:

>  I thought to just tidy up and re-tighten the Head Sensor. Bingo. 

I gather that you did this again and now your engine is running. Is that 
correct?

What did you tighten, the threaded part into the head, or the 1/4" spade 
connection at the end of the wire?

One problem that happens with those sensors is that the wire gets bent 
sharply where it exits the sensor. At some point, the insulation breaks and 
the wire shorts out to the sensor body, making the sensor resistance zero. 
That will bring the engine to an instant halt. This was a big problem 
especially with the 68-9 engines, where the sensor was installed below the 
#4 exhaust port and had no choice but for the wire to bend sharply where it 
exited. I always recommend that those early engines be converted to the late 
head sensor location, which means installing a different left head.

Even for the late engines, '70-on, I recommend being careful of that wire and 
making sure that it comes straight out of the sensor and never gets bent 
there.

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