Technical tech week gauge fix

My 2 5/8" Stewart Warner mechanical temp gauge was reading 35 degrees low. This is how I corrected it.


Photo #1&2 Use paint can opener to carefully uncrimp bezel.
#3 Unscrew nut to disassemble gauge.
#4 Can of water, heated with torch. accurate mercury thermometer (could use any known thermometer) Infrared etc.
#5 Heat water,stir to equalize temp.
#6 Bend kink area only with 2 needle nose pliers , to adjust gauge to thermometer reading. BE DELICATE, IT DOESN'T TAKE MUCH TO MOVE NEEDLE. increasing kink moves needle higher up scale.
#7 After the gauge is calibrated reassemble and roll bezel back with box wrench. You can make a jig to hold gauge in lathe and tailstock and roll bezel on with a ball bearing on lathe tool.


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More info on gauge bezels.

Here is a jig for rolling the bezels back on gauge faces.
You will need a different jig for each diameter gauge.
Using the paint can opener to remove bezel.
That is a bearing in lathe tool holder to roll on the bezel.
The lathe is rotated by hand no power.

Credit for the jig goes to Graham Blighe who authored the book
MAGNETIC SPEEDOMETER REPAIR.
Graham's book is only about British M/C speedos.



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nice! thanks guys

 

So, that's how it's done. Wonder how many gauges have been tossed when they were repairable.

Nice post.

 

very cool. now to fix fuel.

 

awesome thank you!! do you know how to take apart the old 2 5/8 bezels from the 40's and early 50's ??

 

When I learned this in the seventies, you had to check at two places, hot and cold.
But I guess its more important to show the right value at the "normal range".

 

Thanks very much great tech

 

Yes, correct, but I wanted to know my engine temp when hot.


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Pictures are gone?

 

Yes, I know, havent figured out how to get them back?

 

I think you can re-link them somehow. Like, the site you posted them from - the link to that image has changed. If you still have the links to the images, just edit the post and update the links. Or you can just post the pictures as attachments to your post. Good luck, I'm curious how you do this because my method needs improvement!

 

RADIATOR OVERFLOW LEVEL GAUGE. Some clear plastic 1/4" tubing and 90 deg. fittings.

 

For some reason I get an error when uploading file?

 

If you can send me the links to your images, I will post them?

 

Something to try....
I've found that if the MORE OPTIONS is used (to the right side below the normal reply window)
and the pic(s) are inserted in that window, they will upload without the error message.

 

I'll try

Level indicator for radiator overflow bottle. two 1/4" fitting and plastic tubing.

 

Ok, that works, but I can't find gauge fix photos. I will go to apple store and seek help.

Dave