Mine went bad, bottom bakelite is porous and burnt some - Saab 9000 Bulletin Board - Saabnet.com
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Mine went bad, bottom bakelite is porous and burnt some
Posted by RayF (more from RayF) on Tue, 24 Feb 2009 12:25:18
In Reply to: Repairing My DI Cassette, Derek, Mon, 23 Feb 2009 20:19:08
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Around a couple of the plugs, the projecting insulating plastic is melted looking and burnt.
I figure what happened is spark started jumping to ground through the insulating nose, instead of down thru the plug conductor and sparking inside the cylinder where it should. Burned the plastic worse once it found a route thru, and then it flowed massively out thru the carbonized plastic to the head.
I once had a DC-drive film processor that we started to use sometimes with a different kind of photo paper, running it through much faster than the standard stuff. Full DC 90 volts, up from maybe 15 or 20 volts. When we did we'd jerk the knob up to full. That surge I think is what did it. The current burned through one of the bakelite brush holders and went straight to the motor body, to ground, blowing a fuse. I found a new brush holder and fixed things. The bad brush holder had a very similar appearance to the tips on my DI cassette - - carbonized, crumbly, burnt, porous.
I'm going to try sawing off the projecting parts on the two cylinders where this happened and see if the bad DI cassette works, as a backup. Let's see the spark jump an air gap as big as from the top of the plug out to the head. I think the sproingy spring thing will stay on top of the plugs on its own.
I'll post my results here, when I get to this. Lots of other stuff on my list ahead of it.
posted by 72.73.7...
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