Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
Posted by Don B On 2024/4/9 18:58:05
No real secret to the cleaning.. I just carefully cleaned with Simple Green and a Q-tip. Then, just lubricate lightly with a light weight oil (I used 3-n-1) all pivot points. They are easy to see.
For calibration….the first thing to note is that you cannot change the range of the gauge,,,ie minimum to maximum distance the needle travels is fixed. But, you can change the center point. In my case, the needle was hard-pegged to minimum and then only could reach about 75%. After adjustment, the needle didn’t quite peg at minimum, ,but also doesn’t quite peg at maximum.
For my meter, the maximum on the scale is 212 and the center point is 180 degrees. Given the range is fixed, I focused on getting it centered when at 180 degrees.
This picture shows where the adjustment is made. The adjustment is made by gently bending this point toward the center of the gauge or out from the gauge.
It’s a bit of trial and error with very small adjustments each time. I managed to get to the point in the following picture and decided I was pretty good and it was time to stop while I was ahead.
For calibration….the first thing to note is that you cannot change the range of the gauge,,,ie minimum to maximum distance the needle travels is fixed. But, you can change the center point. In my case, the needle was hard-pegged to minimum and then only could reach about 75%. After adjustment, the needle didn’t quite peg at minimum, ,but also doesn’t quite peg at maximum.
For my meter, the maximum on the scale is 212 and the center point is 180 degrees. Given the range is fixed, I focused on getting it centered when at 180 degrees.
This picture shows where the adjustment is made. The adjustment is made by gently bending this point toward the center of the gauge or out from the gauge.
It’s a bit of trial and error with very small adjustments each time. I managed to get to the point in the following picture and decided I was pretty good and it was time to stop while I was ahead.
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