I was organizing the garage a bit and I pulled out a box of old caps, and found I had put that John Deere cap in there too... then noticed it was 'different' (and I'd like to get a new one to try out...if there's still some out there)...

anyhow, here are the pics, outside looks like any /6 distributor, but the contacts in the posts for the cylinders have a 'slot' in them....



Interestingly, inside the contacts are about double wide of the regular cap we'd get from an auto parts store (is this an old ag/industrial cap for better 'ignition'/ under load situation?)




No maker stamped into the plastic, inside there's 'Made in the U.S.A' and
2098765.....


????


Thanks,

-D.Idiot

That's the Chrysler-made TSB cap, rev.1.

The original cap in '60 was # 1889 424. Black bakelite with the "Forward Look" emblem cast into the top, aluminum contacts about 9/32" wide. Used with conventional rotor. There was a TSB in late '62 to address a hard-start condition caused by crossfire under the cap and a "possible" cap material porosity problem allowing the cap to get effectively waterlogged, aggravating the crossfire problem, as well as the possibility of high voltage leakage from the coil-to-cap cable.

Parts package # 2448 273 contained:

-a new cap #2098 765, black bakelite (presumably not porous), aluminum contacts about 1/2" wide

-a new rotor #2098 770, green-brown bakelite, longer contact w/necked-down (narrower) cap end

-a new coil-to-cap cable with better boots on both ends.

Later, the #2098 765 black bakelite cap was supplanted by #2444 690, same cap but in tan alkyd for even better resistance to arcover underneath. The same rotor #2098 765 was used with this tan cap.

These parts were used through '65 as factory production items. Oddly, the final-revision '65 FPC calls out #2098 765 for some distributors, and #2444 690 for others. The only difference is black bakelite vs. tan alkyd material. :shrug:

For '66, the wide-segment cap was superseded by #2642 986, tan alkyd with aluminum contacts about 9/32" wide (same width as the original '60 cap), used with the original ordinary rotor (without extended/necked-down contact). I guess the upgraded material was good enough to prevent arcover and the narrower contacts were probably cheaper to make.

The aftermarket did cover this wide-contact cap; it was a NAPA Echlin MO-6, for example, and I think Echlin also offered the special rotor, perhaps as an MO-7. Long since discontinued. Never seen one (nor evidence of one) with brass or copper contacts, only ever aluminum. Too bad; I think the wide contacts are a nice idea for minimising under-cap arc-and-spark action. I have one of these (an MO-6) on my '71 Dart at the moment.

Betchya didn't think I knew how to rock 'n' roll...

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yeah, I suspected you had some sheet music to go with that guitar solo...


once I took a look at this guys I started thinking that it would be a 'nicer design'....


Thanks for the info, and I'll bet there are a few people here that got some good info too....


Thank You again!

-D.Idiot

There's a guy on eBay who sells these caps. The phrase "wide contact" is always in the auction title. You can modify an ordinary rotor (or an MO-3000) by filing about 1/16" off the left and right edges of the contact...

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.