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Shaft Position Sensor: Trimpot Wrench

With the shaft position sensor mounted in this position:

Kenmore 158 Shaft position sensor - overview

Kenmore 158 Shaft position sensor – overview

There’s no way to get a screwdriver into the trimpot that adjusts the sensor’s trip point.

A few minutes with tin snips, nibbling tool, and square file produced a small wrench:

Trimpot Wrench

Trimpot Wrench

One side of the wrench has a 45° bend that made tweaking the pot just slightly easier.

The proper trip point turned out to be about 90° away from where the trimpot started, with the level midway between the detection points for shiny metal tape and the cutout side of the counterweight.

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  1. #1 by hexley on 2014-11-04 - 13:12

    “There’s no way to get a screwdriver into the trimpot that adjusts the sensor’s trip point.”

    You know, Ed, if you ever think of starting a second career, there are probably openings in the Engine Adjustment Inaccessibility Department at one of the big automakers :-)

    I like your clever solution for the trimpot, though.

    • #2 by Ed on 2014-11-04 - 14:52

      You’ll find me down the hall from the Toyota engineers in charge of the Sienna air conditioning system…

      Putting the LED-transistor head on a cable almost happened, but then I came to my senses.

      • #3 by Red County Pete on 2014-11-05 - 00:34

        down the hall from the Toyota engineers

        And across the street from the Ford and GM engineers. I’ve wanted a few extra joints in my arms for a few projects. (A Watchmaker from Niven and Pournelle’s Mote books wouldn’t hurt, either.)