Tachometer / Rev Counter Stopped Working
- David Withers
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The tacho on my pre-facelift 2.5 (ex-PI) suddenly stopped working during a short but eagerly driven journey. Not being very hot on electrical systems, I searched our forum for ideas as to the cause and cure, but without great success.
Nothing has been changed that might have affected it, and the ignition is the standard points type, not electronic.
Where should I start to look for the cause?
Nothing has been changed that might have affected it, and the ignition is the standard points type, not electronic.
Where should I start to look for the cause?
- Dave B
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- Location:Wigan,Home of the mighty Warriors
Re: Tachometer / Rev Counter Stopped Working
Sorry to be a bit negative David, but my 2500 pfl did more or less the same last year. It was a bit erratic for a short while, then died completely. A replacement tacho restored the status quo! (which now reminds me, I owe for, dont I John )
Club Member 2035
1970 2500 Mk2 in pimento red[/col
Toyota Avensis T4 Tourer
1970 2500 Mk2 in pimento red[/col
Toyota Avensis T4 Tourer
- David Withers
- Senior Member
- Posts:1230
- Joined:Tue Mar 22, 2005 11:28 am
- Location:North Cambridgeshire, UK
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Re: Tachometer / Rev Counter Stopped Working
Mine wasn't erratic so far as I'm aware, but I assume the fault is likewise in the instrument itself. I wonder if they are repairable?
It's unfortunate that I gave away my spare PI instrument panel to a member wanting to upgrade his 2000. I hope John hasn't made the same error, but he's almost certainly more sensible than me!
It's unfortunate that I gave away my spare PI instrument panel to a member wanting to upgrade his 2000. I hope John hasn't made the same error, but he's almost certainly more sensible than me!
Re: Tachometer / Rev Counter Stopped Working
Hello David,
the first check is the electrical connections on the rear of the instrument, not forgetting the earth.
Alec
the first check is the electrical connections on the rear of the instrument, not forgetting the earth.
Alec
0465
MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.
MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.
Re: Tachometer / Rev Counter Stopped Working
Just don't leave town.....Dave B wrote:Sorry to be a bit negative David, but my 2500 pfl did more or less the same last year. It was a bit erratic for a short while, then died completely. A replacement tacho restored the status quo! (which now reminds me, I owe for, dont I John )
But then again Dave ....... I owe you for the extra muscle when we moved the 'fleet' to their new home!!!
Register Member no. 1596
1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red
1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red
Re: Tachometer / Rev Counter Stopped Working
No David!David Withers wrote: It's unfortunate that I gave away my spare PI instrument panel to a member wanting to upgrade his 2000. I hope John hasn't made the same error, but he's almost certainly more sensible than me!
I have a reasonable idea where everything is, what I have, what I can realistically pass on to other Triumph owners, and also I can lay my hands on them when needed. I also am fortunate in the fact that I still have several good used PI speedos in stock!!
Register Member no. 1596
1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red
1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red
- David Withers
- Senior Member
- Posts:1230
- Joined:Tue Mar 22, 2005 11:28 am
- Location:North Cambridgeshire, UK
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Re: Tachometer / Rev Counter Stopped Working
I've repaired my tachometer for a measly £5.29.
I've written up the procedure for SIXappeal, so won't duplicate it here.
I've written up the procedure for SIXappeal, so won't duplicate it here.
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Re: Tachometer / Rev Counter Stopped Working
If you've changed some of the electronic bits, the the tacho may need recalibrating. It's not difficult but does need some special (sort of!) equipment. I have the necessary here at home and will, of course, be pleased to calibrate for members if that helps.
I wonder how you checked yours David?
Cheers,
Mike.
I wonder how you checked yours David?
Cheers,
Mike.
(South Oxfordshire)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
(1949 LandRover was blue should be light green!)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
(1949 LandRover was blue should be light green!)
- David Withers
- Senior Member
- Posts:1230
- Joined:Tue Mar 22, 2005 11:28 am
- Location:North Cambridgeshire, UK
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Re: Tachometer / Rev Counter Stopped Working
Hello Mike.
I calibrated it against 30 and 60 MPH road speeds in third gear, read out from a sat-nav held by my son whilst I watched the tacho (on a straight and quiet country road). Doing it at two road speeds confirmed the consistency.
I thought it best to submit the write-up to SIXappeal rather than to the forum following Kevin's request for more submissions, and it's a bit long for your 'forum extracts' column as well as being illustrated with a photo.
I calibrated it against 30 and 60 MPH road speeds in third gear, read out from a sat-nav held by my son whilst I watched the tacho (on a straight and quiet country road). Doing it at two road speeds confirmed the consistency.
I thought it best to submit the write-up to SIXappeal rather than to the forum following Kevin's request for more submissions, and it's a bit long for your 'forum extracts' column as well as being illustrated with a photo.
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Re: Tachometer / Rev Counter Stopped Working
This is deviating from the point a bit, but it's interesting that it seems to be universally assumed that Satnav is spot-on for speed.
In my observation that is not true.
My Volvo does an indicated 60mph at 2000 rpm. That may not be the actual speed, but it is consistent. So whatever errors may be present in both devices, they give a reliably correct correlation.
But the Satnav varies in the speed it displays, usually something like 54, but it can be anything from 52 to 58.
It's a basic plug-in Garmin, and very useful. But it would not be a reliable way of calibrating a speedometer or tachometer.
Observations?
In my observation that is not true.
My Volvo does an indicated 60mph at 2000 rpm. That may not be the actual speed, but it is consistent. So whatever errors may be present in both devices, they give a reliably correct correlation.
But the Satnav varies in the speed it displays, usually something like 54, but it can be anything from 52 to 58.
It's a basic plug-in Garmin, and very useful. But it would not be a reliable way of calibrating a speedometer or tachometer.
Observations?
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