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Hi, I am new to this site but just wanted to know if any one can give me any advice. Ihave a T&J hornet 1982 cortina 1600 engine and gearbox but my speedo stops at 30 mph and wont go any higher. any boby that can help would be grat.
Let's start with the obvious: if you have a Cortina speedo, gearbox, axle, and running standard wheels amd tyres then the calibration will be correct and the speedo should read normally. Of you've fitted a lower diff ratio the speedo underread but should show 50mph flat out even with a van diff.
As you're probably aware, the speedo needle is free to turn and driven round be magnetic force. Of it rises normally as you accelerate then stops abruptly at 30 this implies it is being physically stopped by an obstruction. Can you take the gauge glass off and see if the needle moves freely by finger?
If the speedo needle pulses back and for at 30 it could be that you need a new speedo cable