My rev counter isn’t working, even if I tap it!
I’ve checked across the terminals for a Voltage, zero…
I did hear or read somewhere that you can get these re magnetised, does anyone know where or indeed if it’s possible?
Thanks, Steve.
Rev counter generator
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Stevemorris
Topic author - Posts: 83
- Joined: Sun Nov 23, 2025 7:59 am
- Location: Wiltshire

#1 Rev counter generator
1973 Rolls-Royce Silver Shadow
1965 Jaguar ‘E’ Type FHC
1965 Jaguar ‘E’ Type FHC
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#2 Re: Rev counter generator
Is it definitely rotating? Not unknown for the drive dog to become distanced from the camshaft
Tim
Tim
Series 1 FHC purchased 50 years ago. Courted my wife in it.
Series 1 2+2 when the kids were small now sold.
Series 1.5 OTS in opalescent maroon, Californian car. My retirement present.
Series 1 2+2 when the kids were small now sold.
Series 1.5 OTS in opalescent maroon, Californian car. My retirement present.
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#3 Re: Rev counter generator
Or to snap off
Steve
69 S2 2+2 (sold) ..Realm C type replica, 1960 xk150fhc
69 S2 2+2 (sold) ..Realm C type replica, 1960 xk150fhc
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Stevemorris
Topic author - Posts: 83
- Joined: Sun Nov 23, 2025 7:59 am
- Location: Wiltshire

#4 Re: Rev counter generator
Thanks chaps,
I have to remove the rearmost cam cap to renew a stud, so I'll check when I do this, and let you know! The drive is still intact Steve I took it off to renew the seal, it is spinning as well, plus I could feel the coupling in the cam and it felt OK?
Steve.
I have to remove the rearmost cam cap to renew a stud, so I'll check when I do this, and let you know! The drive is still intact Steve I took it off to renew the seal, it is spinning as well, plus I could feel the coupling in the cam and it felt OK?
Steve.
1973 Rolls-Royce Silver Shadow
1965 Jaguar ‘E’ Type FHC
1965 Jaguar ‘E’ Type FHC
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#5 Re: Rev counter generator
The generator creates an AC voltage that increases by 1v every 1000rpm. You could try measuring the output first.
Simon
62 3.8 FHC
91 Porsche 928GT
Find me on Instagram and Facebook @oldcarfixer
62 3.8 FHC
91 Porsche 928GT
Find me on Instagram and Facebook @oldcarfixer
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Stevemorris
Topic author - Posts: 83
- Joined: Sun Nov 23, 2025 7:59 am
- Location: Wiltshire

#6 Re: Rev counter generator
Hi Simon, yes already done that and at 1,2,3,4000rpm zero Volts!
Thanks,
Steve.
Thanks,
Steve.
1973 Rolls-Royce Silver Shadow
1965 Jaguar ‘E’ Type FHC
1965 Jaguar ‘E’ Type FHC
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Stevemorris
Topic author - Posts: 83
- Joined: Sun Nov 23, 2025 7:59 am
- Location: Wiltshire

#7 Re: Rev counter generator
Well thanks all. I removed the rear camshaft cap this morning and as Tim mentioned the drive had backed out of the rear of the cam.
I have 'drilled & pinned' it, and it works!
Happy days.
For info the 'pin' was a 1mm x 4mm copper rivet.
Here's a video showing it done.
Thanks again, another job off the list...Steve.
In video 9 I mentioned that the pin was slightly smaller than the hole, I meant bigger..
And after the usual 'tap' to wake the rev counter clock up, it works!
I have 'drilled & pinned' it, and it works!
Happy days.
For info the 'pin' was a 1mm x 4mm copper rivet.
Here's a video showing it done.
Thanks again, another job off the list...Steve.
In video 9 I mentioned that the pin was slightly smaller than the hole, I meant bigger..
And after the usual 'tap' to wake the rev counter clock up, it works!
1973 Rolls-Royce Silver Shadow
1965 Jaguar ‘E’ Type FHC
1965 Jaguar ‘E’ Type FHC
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