#1 Repairing a tach generator
Posted: Wed Mar 16, 2016 8:50 pm
...yes.
First of all, my Generator worked, but it sometimes felt stuck / sticky inside.
So I opened it. Pry of the rear alloy cover. Look inside, and find a centre star-shaped rotor, rubbing on a loose (what the heck...) stator. Okay, how can I fix the stator properly ? I have to pry out this metal insert ring...desaster struck.
Below the ring, if lever around here, you'll break the wire coil. Darn.
So, I had to remove the stator (solder of the two contact wites), then use a cutter blade to separate it, and the caaaaareefully pull it apart without more damage inside to the wires.
Finally, used a multimeter to find the breaks caused by my screwdriver. Un-roll the wire, and solder - repair it. It is lacquer-protected wire, so you have to put the end of the wire into the liquid solder (tin) for a few seconds to burn of the lacquer. Then tin it, and close the break point.
After that, isolate the breaks and fix it all a bit up using epoxy like JBWeld. Before doing so, check the coil for continuity again to be sure - and only use a few blobs, don't cover it in epoxy.
Then, put the coil back in the alloy case, fit the rotor, and balance the stator in the outer case with some paper tabs, so that the rotor runs trouble-free. Use some epoxy to fix it there.
Assemble the rest... Job done.
Carsten
First of all, my Generator worked, but it sometimes felt stuck / sticky inside.
So I opened it. Pry of the rear alloy cover. Look inside, and find a centre star-shaped rotor, rubbing on a loose (what the heck...) stator. Okay, how can I fix the stator properly ? I have to pry out this metal insert ring...desaster struck.
Below the ring, if lever around here, you'll break the wire coil. Darn.
So, I had to remove the stator (solder of the two contact wites), then use a cutter blade to separate it, and the caaaaareefully pull it apart without more damage inside to the wires.
Finally, used a multimeter to find the breaks caused by my screwdriver. Un-roll the wire, and solder - repair it. It is lacquer-protected wire, so you have to put the end of the wire into the liquid solder (tin) for a few seconds to burn of the lacquer. Then tin it, and close the break point.
After that, isolate the breaks and fix it all a bit up using epoxy like JBWeld. Before doing so, check the coil for continuity again to be sure - and only use a few blobs, don't cover it in epoxy.
Then, put the coil back in the alloy case, fit the rotor, and balance the stator in the outer case with some paper tabs, so that the rotor runs trouble-free. Use some epoxy to fix it there.
Assemble the rest... Job done.
Carsten