Re: 1941 120 3 Speed with Overdrive Wiring?

Posted by 1941Packard On 2023/11/28 12:21:36
Quote:

HH56 wrote:
What would be interesting would be if someone with both solenoids at hand could compare R9 and R11 solenoid plungers to see if any parts would interchange. I doubt they would but if that were a possibility it would open up some repair or conversion options. If an R11 repro that comes in 6 and 12v versions could also be compared to see if the r9 plunger could be swapped it would be even better.

Here are differences between solenoid plunger length as well as the bare R9 plunger assy with the ball on the end (ball is almost hidden at the end of plunger in the photo). If the repro solenoid plunger also had a similar travel and a screw on end cap that could remove so the inner shaft with the different lengths could be swapped it would open up lots of possibilities.

Note: I believe BDeB posted the R11 photo some years ago but am not sure if the photo shows the plunger extended or not. If not then it would extend around 1/2 inch to bring the extended measurement to about 1 1/2" so overall length of the R11 extended would be roughly 3/4" shorter than the R9.


For something so simple...It would seem that even if the plungers aren't interchangeable, you could just modify/weld on to the plunger to get the correct length. But even the R11s in 12 volt look hard to come by at the moment, and I'd hate to spend $300 on something just to start welding on it.

Is it not possible to just engage and disengage the overdrive manually? I mean, it's only a plunger going in and out. Obviously you'll lose features such as downshifting if you floor it, automatic engaging/disengaging... but would simplify getting it going.. I'm sure there are other, simpler electronic versions of plungers as well that would just have to be adapted to the case to fit.

What happens if you forget to disengage overdrive as your speed drops?

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