Speedo/Tach question
#1
Intermediate
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Join Date: Jul 2002
Location: Bridge of Allan, Scotland
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Speedo/Tach question
I have two slightly niggly problems :
1- Speedo needle doesn't move off the bottom stop until I'm doing maybe 25mph.
2- Tachometer neddle 'sticks' at between 3500-4000 revs then takes a leap to where it should be (by this time the engine is at about 5000 revs !)
I've removed the multi pin plugs in the instrument pod and cleaned them with contact cleaner and a light scuffing with sandpaper.(I could only find two though, whereas Greg Nichols tips page says there should be three) Unfortunately it's made no difference - am I going to have to remove the entire intsrument pod now ? I'm a bit scared of taking this all apart I have to admit ! Any other tips or ides would be much appreciated.
1- Speedo needle doesn't move off the bottom stop until I'm doing maybe 25mph.
2- Tachometer neddle 'sticks' at between 3500-4000 revs then takes a leap to where it should be (by this time the engine is at about 5000 revs !)
I've removed the multi pin plugs in the instrument pod and cleaned them with contact cleaner and a light scuffing with sandpaper.(I could only find two though, whereas Greg Nichols tips page says there should be three) Unfortunately it's made no difference - am I going to have to remove the entire intsrument pod now ? I'm a bit scared of taking this all apart I have to admit ! Any other tips or ides would be much appreciated.
#2
928 Engine Re-Re-Rebuild Specialist
Rennlist Member
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Stevie:
I don't have the tach problem, but my speedo does the same thing, kind of. It stays at the "0" position until either I've reached 30mph or so, or I hit a bump. Then it jumps to the right speed.
I was under the impression that this was due to a sticky gear for the needle....a small dab of oil as a lubricant for a cure. I haven't tried it yet, so I don't know for sure. It hasn't bothered me enough yet to justify pulling the pod off.
I don't have the tach problem, but my speedo does the same thing, kind of. It stays at the "0" position until either I've reached 30mph or so, or I hit a bump. Then it jumps to the right speed.
I was under the impression that this was due to a sticky gear for the needle....a small dab of oil as a lubricant for a cure. I haven't tried it yet, so I don't know for sure. It hasn't bothered me enough yet to justify pulling the pod off.
#3
I can verify the effectiveness of that for the speedo, Dave. It will need to be done periodically after that.
For the tach, I had a brief time when it would stick at about 4K. It was the connection to the PCB - I could reach up and move the multi-connector and it would resume normal operation.
For the tach, I had a brief time when it would stick at about 4K. It was the connection to the PCB - I could reach up and move the multi-connector and it would resume normal operation.
#4
Burning Brakes
Join Date: Apr 2002
Location: Denmark
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I fixed my Speedo with soldering - on the printed circuit there are two rivets where the connections goes from the printed circuit to the Speedo - Here was bad connections - Easy to measure with a ohm-meter - I fixed the connection with carefully soldering.
I found this after third attempt - But still, I cannot, like Jack, do it in 15 minutes!
I found this after third attempt - But still, I cannot, like Jack, do it in 15 minutes!