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65 Corsa tach question.
Posted by: Willt65 ()
Date: January 17, 2018 04:04PM

I am cleaning up my gauges, and when disassembling the tach, I see this- 2 foam blocks glued onto the back of the tach face. Of course they are rotted and crumbly. My question is, what is the function of these 2 foam blocks? Are they there to provide some sort of dampening function? Or ? Should I replace it with like material? Thanks in advance for the expertise! I have the schematic and plan on replacing the capacitors. I think the tach did work but that was 10 years ago when I pulled it out of storage, I would like to not have to go back in after together. Also should I be replacing any of the other components just because I'm this far in? Transistor etc... ?

Will Teeter
Flintstone, MD
65 Corsa project

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Re: 65 Corsa tach question.
Posted by: jjohnsonjo ()
Date: January 17, 2018 04:44PM

They block eddy currents from the heat of the bulbs affecting the meter movement. Just Cut some similar foam and glue it. Or use LEDs. The plastic around the bulbs, for the same reason is often destroyed as well.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: 65 Corsa tach question.
Posted by: jjohnsonjo ()
Date: January 17, 2018 04:48PM

If you have a running engine, just hook it to the coil. If it works, leave it alone. Compare to a good tech.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

Image and video hosting by TinyPic

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Re: 65 Corsa tach question.
Posted by: 66vairman ()
Date: January 17, 2018 05:17PM

You'll find the newer light bulbs don't fit in the plastic housings. Sometimes the plastic is broken and laying inside the unit.

I believe the foam was to block light reflection between the dial and needle cover. Easy to replace with house weather strip foam.

The capacitors may work, but are long past their design life. The other parts usually are fine, just change the capacitors and test unit.

The most common problem I found was broken meter needle/armature springs and are not practical to repair.

Overall for 60's technology the Corvair tachometer was a well designed unit. Not sensitive to normal voltage or dwell variations.

The large sweep required a precision meter that is difficult to calibrate (I've seen three types, all work the same). If you paint the needle it will be off at low or high RPM readings. My average time to rebalance the needle/armature was SIX hours. After doing them for myself and Vair buddies I quit. Just too time consuming to make them accurate.

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Re: 65 Corsa tach question.
Posted by: Willt65 ()
Date: January 17, 2018 05:32PM

Thankfully all of the movements look good and the tach face and needle are in great shape! I'll replaced the capacitors and move on! Thanks for the info!!!

Will Teeter
Flintstone, MD
65 Corsa project

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