SE5A Ignition switch overhaul

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747PETE
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SE5A Ignition switch overhaul

Post by 747PETE » Wed Jan 24, 2018 8:23 pm

I have always had doubts about the ignition switch on my SE5A,with regards to some old starting issues the previous owner spoke about. So, having given up working on getting the Scimitar started after a few years, I decided to do something in the warm and dry...it lives outside. I thought I would strip down my spare ignition switch assembly and see what I was up against inside the housing. It is held on the lock assembly with one small cross head screw, once removed the switch part just pulls out, leaving the lock barrel behind. I marked adjacent mating surfaces to aid assembly but there is a small register cast in the housing with small cut outs in all the mating parts to register against.
Once removed, gently tease the edges where the "monkey metal" is peened over the paxolin terminal plate, then carefully tease the whole assembly out, the springs will not leap out at you!
The terminal paxolin plate comes straight off and is followed by another paxolin plate, be careful here there are 3 small springs under a copper plate beneath this.
Next, remove the copper contact plate and underneath you will find 3 small springs in the nylon rotating switch selector below. Remove those 3 springs, then the nylon rotating part will lift out. Be careful here, there is a small ball bearing sitting on a tiny spring below.
Once all these parts are now removed and carefully cleaned up its pretty straight forward to see how it all works. The only part showing any signs of wear was the paxolin plate that has all the spade connectors on. I very gently dressed all the contacts to get them level, you can see one still has a tiny worn chamfer on it. I decided not to go any further because the contactor plate has indents that allow it to "miss" contacts as they rotate, if you remove too much, there would be a danger of them all touching.
When reasembling it all, be careful to make sure the little ball bearing stays on the detent that is on its own in the base housing and not in one of the "paired" indents. You will see as it goes back together, the return spring for the start position will only fit in one place.
Then it’s the 3 springs and contacter copper plate which has indents for those 3 springs to sit in, paxolin cover plate next. You will have to apply gentle pressure to keep it all together. It is worth checking the action with a wide bladed screwdriver, whilst keeping gentle pressure holding it all together :D I had to do it a few times to make sure all was well with the little ball bearing. You can feel it when it all works as it should.
Then refit the cover plate with the contact spades and carefully re-peen it over...easier said than done. It all works witha positive action now.
I will swop it for the one on the car, then strip that one out. They are very simple and actually quite well made. I used a little bit of "Moly" grease on the ball bearing plate and just sprayed the copper contactor plate with switch cleaner/lubricator. All the contact areas were cleaned up with a tiny wire brush on my Dremel drill, it worked very well.
All I have to do now is get some sparks going to the engine...its having a sulk! I hope the snaps help. Pete.
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747PETE
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SE5A Ignition switch overhaul

Post by 747PETE » Wed Jan 24, 2018 8:24 pm

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DSCF7210switch.jpg (152.01 KiB) Viewed 780 times



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peter freeman
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SE5A Ignition switch overhaul

Post by peter freeman » Wed Jan 24, 2018 10:28 pm

Must be satisfying to repair one - personally I would just buy a new one.
http://www.ebay.co.uk/itm/LUCAS-39415-1 ... Sw0j9ZVRPH



747PETE
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SE5A Ignition switch overhaul

Post by 747PETE » Thu Jan 25, 2018 7:25 pm

I just wanted to see what was inside a reasonable one,then I will strip the one on the car.The guy who looked after it before me...Iain Daniels...had suspicions about it.First things first,sparks next😀



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guybetts
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SE5A Ignition switch overhaul

Post by guybetts » Thu Jan 25, 2018 7:59 pm

747PETE wrote:
Thu Jan 25, 2018 7:25 pm
I just wanted to see what was inside a reasonable one,then I will strip the one on the car.The guy who looked after it before me...Iain Daniels...had suspicions about it.First things first,sparks next😀
I'm with you Pete :D
Stripping a part down, really helps to understand how it works, and gives a good insight when fault finding. However Peter, I am not averse to buying a replacement too, for when it doesn't work on reassembly :oops:

Guy


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1966 Straight Six Coupe, 1981 GTC
Previous: SS1 1300 (C230 EPP) & 18ti (D993 WRX)

747PETE
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SE5A Ignition switch overhaul

Post by 747PETE » Thu Jan 25, 2018 8:21 pm

I will drink to that! It was date stamped 06/1972.......... :D



747PETE
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SE5A Ignition switch overhaul

Post by 747PETE » Thu Jan 25, 2018 8:24 pm

747PETE wrote:
Thu Jan 25, 2018 8:21 pm
I will drink to that! It was date stamped 06/1972.......... :D
Especially when the new one says “Made in England” that is an endangered species these days!



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