Camshaft sensor (rev centre) query

[dnt]

Hi, I have just brought a second hand camshaft sensor (rev centre) for my electric speedometer on my 6045 (as previous owner had taken it off). So when bolting on the camshaft sensor what is the correct position of the three terminals for the electric cables? i.e. should they be at the bottom (pointing towards the ground or at the top (pointing towards the sky) etc. I have currently got it bolted so the three terminals on the camshaft sensor point to the right, but have a feeling this might not be correct. My speedometer is working when you increase the throttle to high revs, however the needle is not dropping below 18 km/h (it was like this when the camshaft sensor was missing). So can someone please advise me how to correct the speedometer so it drops right back to 0 km/h when I decrease the throttle.

Thanks in advance
David

 

[hve]

Hi David, it will make no difference what way the terminals are pointing as the sensor just rotates round and round, timing is not an issue....... it just sends a pulse (digital) signal to the electronic Tacho.
(unless they copied the old Smiths system like my MK10 Jag, with a little generator on the back of the cam shaft, and the Tacho was basically a volt meter (ie analogue and not digital signal), but i doubt it).

Assuming it is still reading 18 with all power disconnected, The problem with your Tacho (Rev Counter) will be internal, most likely a little rust stuck to the magnet and jamming the needle.
you will need to remove the Tacho and carefully clean the movement (compressed air, or vacuum cleaner).
Then if required reset the Zero adjustment (on the hair spring) to zero the needle.

However, if it returns to zero with the power disconnected (ignition off) but reads 18 when powered up, it is an electrical fault, and most likely a bad earth, or you have the wires crossed over on the sensor.

 

[dnt]

Hi Steve, following your advice I quickly fixed the electric speedometer. I carefully pried off the steel rim holding on the glass face then undid the four screws and pulled off the plastic cover for the electric cables at the back of the speedometer to enable me to slide the speedometer out of it's case. I then slowly examined it and saw an internal screw and washer had come loose and where sticking to the magnet (thus stopping the needle from dropping below 18 km/h). I carefully removed the screw and washer with a small pair of pliers and the needle instantly dropped down to 0 km/h. I put the washer and screw back in it's rightfully place and then gave the glass of the speedometer a thorough clean and the face of the speedometer a light gentle brush with a clean cloth to remove any dust. I then reassembled the speedometer and tested it and it is now working perfectly, so thanks for your help Steve.

 

[hve]

Happy to help