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how to check a 56 plymouth speedometer?
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jerrybev
Posted 2019-07-20 10:36 AM (#585022)
Subject: how to check a 56 plymouth speedometer?


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Location: Winston Salem, N.C.
hi
I have an extra speedometer for a 56 Plymouth and want to know if it is any good. How to verify? I notice there is a hole on back side. Should I take a small phillips or a small flat head screw driver? (which one?) and stick it in and try to turn it slowly clockwise and see if it is stuck/moving?
thank you
jerry whitfield
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56D500boy
Posted 2019-07-20 11:28 AM (#585023 - in reply to #585022)
Subject: RE: how to check a 56 plymouth speedometer?



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You could put a screwdriver bit into a drill chuck and spin the speedo with the drill (get the direction correct first).

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57chizler
Posted 2019-07-20 12:38 PM (#585025 - in reply to #585022)
Subject: RE: how to check a 56 plymouth speedometer?



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The hole is .104" square. For testing purposes, 1000 rpm is 60 mph and 1000 turns is one mile on the odometer.
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jerrybev
Posted 2019-07-21 2:01 PM (#585052 - in reply to #585023)
Subject: RE: how to check a 56 plymouth speedometer?


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Posts: 473
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Location: Winston Salem, N.C.
hi
thank you, should I use a flat head or phillips screw driver bit?
Jerry
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56D500boy
Posted 2019-07-21 2:17 PM (#585053 - in reply to #585052)
Subject: RE: how to check a 56 plymouth speedometer?



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Location: Lower Mainland BC
jerrybev - 2019-07-21 11:01 AM
thank you, should I use a flat head or phillips screw driver bit?


Whatever fits nuggly. I suspect that a small(er) Phillips would work best.

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57chizler
Posted 2019-07-22 12:21 PM (#585087 - in reply to #585052)
Subject: RE: how to check a 56 plymouth speedometer?



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Posts: 3210
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Location: NorCal
With a piece of steel rod and a bench grinder you can make a square drive shaft that will fit the hole better than a screwdriver tip.
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