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Post by rhyds on Mar 6, 2019 0:35:20 GMT 1
Just a quick one to settle an argument on another forum:
1: Are speedometers checked for actual operation during an MOT, or just for damage/obvious failure (missing needle etc)?
2: If they are tested for operation, how do you do it?
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Deleted
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Post by Deleted on Mar 6, 2019 1:18:12 GMT 1
The only time the speedometer is checked for operation is if a decelerometer brake test is required, or is necessary because the RBT has failed in service. During the decel test the tester would pick up the inoperative speedo because the speed cannot be gauged at about 20 MPH for the brake test, hence the speedo is then a justified fail.
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remmington
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Post by remmington on Mar 6, 2019 8:08:21 GMT 1
Only a permanent 4x4 would fail for a speedo problem.
Guardian is correct.
Not sure if speedo illumination is coming thou?
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Post by Deleted on Mar 6, 2019 9:55:53 GMT 1
7.8 Speedometer
You must check the speedometer of vehicles first used on or after 1 October 1937 with a maximum speed above 25mph.
You don't need to check Class 3 vehicles.
If a road test is needed, for example to carry out a decelerometer test, you must check whilst driving that the speedometer is working.
If a road test isn't necessary, you should only reject a speedometer if it’s clearly not working.
Speedometers don't need to be lit on:
vehicles with no front or rear position lamps
vehicles that have front or rear positions lamps that are permanently disconnected, painted over or masked
You can accept a tachograph as an alternative to a speedometer if it satisfies the requirements of this inspection.
Using a decelerometer
If the vehicle or system can’t be tested on a roller brake tester, set up the decelerometer in the vehicle in accordance with the equipment manufacturer’s instructions
Drive the vehicle on a level road at a steady speed of approximately 20mph (32kph) and progressively apply the service brake to maximum.
Would that not also cover vehicles tested where the RBT has failed awaiting repair and those vehicles were previously booked before the RBT failed?
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Post by Karl on Mar 6, 2019 21:24:26 GMT 1
You could probably count on one hand the number of cars that fail
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Post by studabear on Mar 6, 2019 21:28:31 GMT 1
My Speedo cable is dangling under the bonnet as there is no drive on the gearbox for it lol.
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remmington
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Post by remmington on Mar 6, 2019 21:40:54 GMT 1
My Speedo cable is dangling under the bonnet as there is no drive on the gearbox for it lol. Been using a sat nav then? |
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Post by studabear on Mar 6, 2019 22:45:51 GMT 1
Yes. Speedo will be sorted this year. My a has made a device that takes the signal from gearbox sensor and converts it to drive a motor that drives the Speedo cable.
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Post by Deleted on Mar 6, 2019 23:10:08 GMT 1
You might be able to take a reference signal from the ABS if fitted! My Audi is very interesting in that department, if the speedo (MPH) indicator fails in service my ACC climate control (digital) can be used as a back-up to show road speed  |
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Post by valhalla on Mar 7, 2019 23:56:15 GMT 1
Something that makes me wonder - perhaps someone could enlighten me;
I have always believed that the speedo was not part of the test, as the above confirms, except for it to be illuminated. But..... does the Inspectorate computer system get confused if the vehicle returns back year after year with same odometer reading? Or is it happy to have the same mileage entered each time?  |
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Post by givusaclue on Mar 8, 2019 0:12:55 GMT 1
It flags up if it's the same mileage, less mileage or significantly higher mileage but will let you enter it, it will also convert km or miles to tell you the same
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Post by Deleted on Mar 8, 2019 14:43:54 GMT 1
Something that makes me wonder - perhaps someone could enlighten me;
I have always believed that the speedo was not part of the test, as the above confirms, except for it to be illuminated. But..... does the Inspectorate computer system get confused if the vehicle returns back year after year with same odometer reading? Or is it happy to have the same mileage entered each time? It is but the problem between passing it and failing it only becomes apparent if a road test is necessary. Also, it is not a speedo  |
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Post by givusaclue on Mar 8, 2019 16:40:29 GMT 1
Something that makes me wonder - perhaps someone could enlighten me;
I have always believed that the speedo was not part of the test, as the above confirms, except for it to be illuminated. But..... does the Inspectorate computer system get confused if the vehicle returns back year after year with same odometer reading? Or is it happy to have the same mileage entered each time? It is but the problem between passing it and failing it only becomes apparent if a road test is necessary. Also, it is not a speedo What is not a Speedo? |
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Post by Deleted on Mar 8, 2019 19:35:15 GMT 1
It is but the problem between passing it and failing it only becomes apparent if a road test is necessary. Also, it is not a speedo What is not a Speedo? That thing in the instrument display that you look at to assess how fast you are going. valhalla should know different  |
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remmington
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Post by remmington on Mar 8, 2019 20:29:23 GMT 1
That thing in the instrument display that you look at to assess how fast you are going. valhalla should know different Odometer records mileage on a wheeled vehicle. And... A speedometer displays the vehicle speed. I have been wrong about a lot of things in my life. But Guardian... I doubt if this will be one of them?  |
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