adjust speedo so needle shows 0mph at rest
Oct 9, 2011 18:55:12 GMT -5
Post by sigmfsk on Oct 9, 2011 18:55:12 GMT -5
> [from scatpack01] I need to find out why my needle stays at about
> the 20 mph mark when sitting.
Hi Scatpack:
I'm glad you brought this up. Now that I've fooled with the speedos a bit, I think it may not be difficult.
pic 1 : shows the spring and how the stop works to return the needle to the 0mph position
pic 2 : shows how it looks when the needle moves above 0mph (showing how the bell rotates and the bell stop moves away from the post).
The needle can be (gently but firmly) rotated in relation to the bell. It takes enough force that it shouldn't happen in regular operation, but it could happen if it got bumped or such during installation. At least that's my guess.
pic 3 : shows the aftereffect of me holding the bell, and then moving the needle clockwise in relation to the bell. This makes the speedo read 20mph at rest. To reset it, I just held the bell, and then rotated the needle back.
Yours reads 20mph at rest.
I think you can just:
- remove the plastic cover
The return spring has already returned the bell to the 0-mph rest position. So it can't rotate any more counter-clockwise.
- gently rotate the needle counter-clockwise back to 0 mph. The bell will stay locked, and the needle shaft will rotate counter-clockwise in relation to the bell.
Now I can't take responsibility if your speedo blows up and burns down your house, but at least you have pictorial evidence that I did it to mine without any problems. The reason I was investigating that area of speedos is that I got an unboxed but unused civilian speedo in trade that had the needle below 0mph, and I kept wondering how that could happen. I think it just got "bumped" somewhere along the road and the needle shaft rotated in relation to the bell.
Please let me know if you try it and if the speedo seems to work fine afterwards.
your friend in correctly working gauges,
arthur
from archived info here:
www.bluesbrotherscentral.com/forum/topic/8327-theres-a-new-marin-county-sheriff-in-town/page__view__findpost__p__120795
> the 20 mph mark when sitting.
Hi Scatpack:
I'm glad you brought this up. Now that I've fooled with the speedos a bit, I think it may not be difficult.
pic 1 : shows the spring and how the stop works to return the needle to the 0mph position
pic 2 : shows how it looks when the needle moves above 0mph (showing how the bell rotates and the bell stop moves away from the post).
The needle can be (gently but firmly) rotated in relation to the bell. It takes enough force that it shouldn't happen in regular operation, but it could happen if it got bumped or such during installation. At least that's my guess.
pic 3 : shows the aftereffect of me holding the bell, and then moving the needle clockwise in relation to the bell. This makes the speedo read 20mph at rest. To reset it, I just held the bell, and then rotated the needle back.
Yours reads 20mph at rest.
I think you can just:
- remove the plastic cover
The return spring has already returned the bell to the 0-mph rest position. So it can't rotate any more counter-clockwise.
- gently rotate the needle counter-clockwise back to 0 mph. The bell will stay locked, and the needle shaft will rotate counter-clockwise in relation to the bell.
Now I can't take responsibility if your speedo blows up and burns down your house, but at least you have pictorial evidence that I did it to mine without any problems. The reason I was investigating that area of speedos is that I got an unboxed but unused civilian speedo in trade that had the needle below 0mph, and I kept wondering how that could happen. I think it just got "bumped" somewhere along the road and the needle shaft rotated in relation to the bell.
Please let me know if you try it and if the speedo seems to work fine afterwards.
your friend in correctly working gauges,
arthur
from archived info here:
www.bluesbrotherscentral.com/forum/topic/8327-theres-a-new-marin-county-sheriff-in-town/page__view__findpost__p__120795