Wonky speedometer - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 4 (permalink) Old 11-07-2012, 10:07 AM Thread Starter
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Wonky speedometer

So, the speedo in my '69 GTV1750 seems to think I tend to drive between 70 and 40, as the needle only really bounces around between those speeds on the gauge. Once I get about 20, its all over the place.

What steps should I go through to diagnose what the problem is? Is it hard to take out the cable and lube it as an easy first step?
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post #2 of 4 (permalink) Old 11-07-2012, 01:12 PM
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That is your first step, lube may fix it. Undo the cable at the speedo or the water pump drive and pull the inner out. It may only come out from the speedo end if I remember correctly.?

http://www.alfabb.com/bb/forums/alfa-romeo-club-canada-toronto-chapter/149533-alfa-parts-garage-sale.html
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post #3 of 4 (permalink) Old 11-07-2012, 02:45 PM
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Or lube may just destroy your speedometer. Normally those cables don't need any user-applied lubrication and a lot of people just use so much lube that it's pushed right into the speedometer and then you actually need quite a good specialist to fix that. Pull out the cable and see if you can twist the cable. If so: get a new one and replace it. If that doesn't help you will have to recondition the speedometer (better option: find someone who's specialized on old speedometers 'cause those things are quite sensitive).
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post #4 of 4 (permalink) Old 11-07-2012, 03:21 PM
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I had the exact same problem on the same car. Tried two new cables - still no good.

I managed to buy a 2nd hand unit - works perfectly attached to my drill, however I haven't refitted the dash yet (another job), so I won't know if it works properly until it's in place.

I think the point about over lubrication is spot on. My old one was smothered in oil inside.

Cheers,
Wazza.

"horsepower sells cars - torque wins races".
1969 MK1 1750 GTV
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