FASTdan
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| posted on 14/3/09 at 06:17 PM |
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speedo intermittent jump
The speedo cable on our mk indy reads accurately however approximately ever 3 seconds it will drop for a split second and then jump past the actual
speed. Basically I think the cable is occasionally 'grabbing' which is the drop, winding up/twisting and then releasing.
Question is, is it passable? im guessing not. It does read steady as I say, but then does this drop-jump thing.
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Paul TigerB6
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| posted on 14/3/09 at 06:26 PM |
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I would hazard a guess that the cable needs lubricating properly. Check the routing also - nice sweeping curves are what you want
[Edited on 14/3/09 by Paul TigerB6]
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britishtrident
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| posted on 14/3/09 at 07:44 PM |
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Take the inner cable out and wipe it clean, then lubricate with fresh moly grease (CV joint grease is perfect) BUT only a minimum ammout wipe nearly
all grease off before you put the cable back in the outer.
Don't use oil on the cable -- as it will work its way up into the speedometer head and cause it to stick and jump -- cure
for this to wash the speedo mechanism in a powerful solvent.
[Edited on 14/3/09 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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FASTdan
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| posted on 15/3/09 at 08:49 AM |
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Hi,
Thanks for the advice on the cable - I didnt realise you could take it out of the sleeve actually?
We have since traced the problem to the mileometer wormgear on the main shaft of the speedo drive. The driven gear had worn on some teeth and was
causing the worm to slip and make a ticking noise. We have therefore removed the transmission parts for the mileometer as a temporary fix and the
speedo is perfectly stable now.
Just means we dont have a mileage reading for the time being but I cant see an issue with this from an SVA/legal side of things? Apart from the
limited mileage insurance which we should be able to get around somehow.
NEW danST WEBSITE NOW LIVE! Bike carbs, throttle bodies and more......
http://www.danstengineering.co.uk/
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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MautoK
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| posted on 16/3/09 at 06:53 PM |
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I had exactly the same problem with the worm on the cross shaft being damaged - so I removed the second shaft (the one parallel to the cable) to
remove the load from the duff one.
As I've posted elsewhere, mine also had a tight bearing where the cable enters the speedo head.......AND  a knacked cable inner.
I also fitted a bike speedo as backup - but fortunately this wasn't needed as the standard unit behaved fine today at the SVA retest (dragged
the car 80 miles and paid £38 just for the 2 minute speedo test!)
But how good is it to have a MAC in your hot sweaty paws! 
He's whittling on a piece of wood. I got a feeling that when he stops whittling, something's gonna happen. (OUATITW/Cheyenne)
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britishtrident
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| posted on 17/3/09 at 10:57 AM |
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Ticking sound is normally a sign a new speedo cable is required. Are you 100% sure the cable is OK
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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