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Post by cstorey on May 17, 2015 14:13:38 GMT
The kickdown switch appears to be missing a plunger or something similar. Please can anyone tell me what is missing and how it works when it is complete ?  |
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Post by Colin McA on May 17, 2015 14:32:10 GMT
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Post by cstorey on May 17, 2015 14:39:53 GMT
Colin : splendid , thank you . It seems I have lost the plunger and, presumably, a ball bearing held in by that external spring clip to prevent the plunger escaping. Lathe work beckoning !
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Post by Deleted on May 17, 2015 18:42:45 GMT
The kickdown switch appears to be missing a plunger or something similar. Please can anyone tell me what is missing and how it works when it is complete ? Worth pointing out that the switch does nothing apart from act as a stop and an indication that kickdown is about to be operated. It's not attached to anything either electrically or mechanically. |
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Post by richardlamsdale on May 17, 2015 20:03:14 GMT
Resurgam - yes, that confused the heck out of me when I first bought my car. I couldn't fathom how this thing was a kick-down switch, and thought mine must be missing something major.
As you say, it's basically a sprung throttle stop, giving more resistance to the accelerator pedal approximately where kick-down occurs in the pedals travel. Mine had similarly disintegrated, but luckily I found the steel ball on the floor and after bending the spring clip, it seems to have stayed in one piece.
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Post by cstorey on May 18, 2015 8:20:52 GMT
I made a new plunger from an old cylinder head stud suitably turned down to size , filed a flat on part of it to act as a detent, and made a stop from some brass rod. All now works, but what the point of it is , is rather hard to see. Thanks to everyone for their help
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Post by johnwp5bcoupe on May 18, 2015 9:11:14 GMT
I made a new plunger from an old cylinder head stud suitably turned down to size , filed a flat on part of it to act as a detent, and made a stop from some brass rod. All now works, but what the point of it is , is rather hard to see. Thanks to everyone for their help Richards description above/below should help  |
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Post by Warwick on May 18, 2015 12:30:42 GMT
Yes, Richard summed it up nicely.
It's actually a very clever and simple way of allowing you to control gearbox kickdown. Don't forget the distinction between a down-shift and kickdown. They're entirely different things. Kickdown is when you floor the pedal because you need a bit of acceleration quickly. Revs up, and down a cog. You don't want this occurring unexpectedly. (Of course it's more critical in something with a bit more grunt than one of our old girls).
This simple little device is there to give you that control. You can confidently push the pedal all the way down knowing that it will only change down if the gearbox thinks it's necessary. But if you want to force a gear change at wide open throttle, you can push through the pedal stop and kick it down a gear.
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Post by lagain on May 19, 2015 19:40:11 GMT
problems with kickdown can sometimes be due to the disintigration of the rubber bush that the rod from the carbs should sit in that holds the cable that goes down the tube behind the right side of the air cleaner. The cable should be adjusted properly for correct operation of the gear box
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