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| Reverse Switich https://www.ausmini.com/forums/viewtopic.php?f=2&t=99553 |
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| Author: | Ramon Maurice [ Mon Dec 23, 2019 4:29 pm ] |
| Post subject: | Reverse Switich |
Afternoon All, I am currently working on a restoration project and have come across a conundrum in relation to the gearbox and reverse switch which sits at the front of the gearbox just under the oil filter. From what I can see I have the original large switch which obviously is not working. I've pulled the switch out and cannot for the life of me see how it works. Can anyone please explain ? I may be that it has previously been put back together incorrectly and parts are missing. Although looking at what I have I cannot understand how the rod activates the switch. I've seen links on the forum to an aftermarket switch replacement, but moreover I'm interested if 1. I've got all the parts and how these work with the reverse rod selector. Any help would be appreciated. Thank you |
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| Author: | timmy201 [ Mon Dec 23, 2019 4:40 pm ] |
| Post subject: | Re: Reverse Switich |
When reverse gear is selected, the long selector shaft pushes through the case toward the switch. This moves the detent plunger up towards the switch. Do you get continuity through the switch when you push the button on the inside? |
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| Author: | drmini in aust [ Tue Dec 24, 2019 5:04 am ] |
| Post subject: | Re: Reverse Switich |
There is a small diameter pin inside the spring, I can't see if it's there? Not present if no switch fitted. |
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| Author: | winabbey [ Tue Dec 24, 2019 5:41 am ] |
| Post subject: | Re: Reverse Switich |
Ramon Maurice wrote: From what I can see I have the original large switch which obviously is not working. Check continuity while the switch is out on the bench. The circuit should be open with the switch as it is now. Push the ball in and the circuit closes. If that's not happening the switch itself is cactus. |
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| Author: | Bill B [ Tue Dec 24, 2019 8:55 am ] |
| Post subject: | Re: Reverse Switich |
drmini in aust wrote: There is a small diameter pin inside the spring, I can't see if it's there? Not present if no switch fitted. The small diameter pin fits inside the spring and connects the detent plunger to the ball in the end of the switch to close the circuit. There should be a fibre washer under the switch, too. |
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| Author: | Ramon Maurice [ Tue Dec 24, 2019 12:50 pm ] |
| Post subject: | Re: Reverse Switich |
Thanks for those who have replied. I'll check the continuity whilst switch is out. Am I correct in saying that the detent plunger only moves about 2 millimeters ? |
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| Author: | simon k [ Tue Dec 24, 2019 2:09 pm ] |
| Post subject: | Re: Reverse Switich |
Ramon Maurice wrote: Thanks for those who have replied. I'll check the continuity whilst switch is out. Am I correct in saying that the detent plunger only moves about 2 millimeters ? yeah, it's not much |
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| Author: | drmini in aust [ Tue Dec 24, 2019 2:26 pm ] |
| Post subject: | Re: Reverse Switich |
I found new switches don't work, they have made the ball plunger too big diameter to clear the spring. Need to make an adaptor. Edited for clarity. |
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| Author: | slide [ Tue Dec 24, 2019 2:28 pm ] |
| Post subject: | Re: Reverse Switich |
Guessworks Mini Gearboxes does one which is supposed to work well. |
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| Author: | Bill B [ Tue Dec 24, 2019 3:19 pm ] |
| Post subject: | Re: Reverse Switich |
drmini in aust wrote: I found new switches don't work, they have made the ball plunger too big diameter to work with the spring. Need to make an adaptor. Drmini: Are the new switches that you are referring to, that have the bigger ball, also the ones with the M16 metric thread? If so, the metric version is now being sold using the original mini/1100 part number of GAE131 but, as you say, don't fit minis. If Ramon Maurice needs a new switch, there are some NOS ones for sale on ebay-type places, under the original Lucas p/n of 34887b, which is stamped on the switch body. |
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| Author: | drmini in aust [ Wed Dec 25, 2019 3:47 am ] |
| Post subject: | Re: Reverse Switich |
@Bill B, I didn't measure the thread but it did screw into the gearbox fine. Yes it had the Mini part number GAE131but I think it's off a Jag or something. I sourced a S/H switch instead. |
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| Author: | Ramon Maurice [ Mon Dec 30, 2019 1:29 pm ] |
| Post subject: | Re: Reverse Switich |
Problem sorted. Switch was incorrectly fitted by last user. Actually surprised that the switch is still in good working order given that it had 3 coats of paint and is probably 40 years old. Now for the rebuild. Thanks to all who offered advice. Ramon |
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