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2140 Lost engine speed indication

L

Lost in time

New User
I just had to replace the stop cable. To do that I had to remove and refit the revcounter cluster,just unplugged everything removed the cluster replaced the stop cable and refitted the cluster replacing all plugs. Ever since I did that the revcounter does not work. The only thing it does is when I stop the engine and turn off the ignition the counter kicks off 0 and back to rest position. I've unplugged and reconnected everything several times but no change, any ideas on what to single out as a point to look for the fault.
 
Did you remove the tach cable from the back of the tach? Sounds like it might not be seated properly in the drive.

Ben
 
2140 has electric tach. I bet you have a poor connexion. Remove plug again and clean all the pins with wd40, straighten them if needed and reinstall.
 
Thanks for replying, sadly it not a cable tacho, it an electronic one. I wish it was mechanical I could solve that electronics are a thorn in my side, it seems there are so many ways to do the same job with electronic stuff, get it wrong and you seem to screw your self.
Cheers
 
yes I've unplugged and reinserted the plugs several times, but I'll inspect them closer, they do look nice and clean not black and grotty, but will look closer and clean with WD40 as you suggest.
 
Thanks for all the suggestions so far. Update on progress so far. I've cleaned all the pins with WD 40 pluged and unpluged the plugs several times. I've also checked the output from the sensor on the front engine cover at the plug by the alternator and continuity of the red/grey wire to the plug terminal on the back of the revcounter. The voltage readings at the sensor and plug = about 3.6volts AC on tick over and about 5.8 volts when revving the engine. Am I correct in assuming the speed sensor is faulty or could there be something else?

Can I inject some sort of signal into the red/grey wire to the revcounter to simulate a signal from the sensor? Although I'm not sure how I could do it at the moment or what the max volt AC signal could be.

One thing I noticed and found out is that if I turn off the ignition and rev the engine the revcounter reads, but only about 1500 rpm and does not start to read at all until about 1000-1200rpm. The voltage readings stay as above and when reading 1500rpm I'm sure the engine is actually doing more nearer 2000rpm.
 
Forgot to mention one other observation, since cleaning and putting it all together, that is that while the ignition is on and the revcounter is not working I noticed the hours counter has started to work.
 
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