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A Special Builder's Notes

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The Special Builder's Breakfast Club

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12 December 2021

Problem Solved.

I didn't think that a workable solution to the clutch operation would take me as long as it has, but not doing the research and the calcs in the first place and thinking I could wing it with a novel idea, was the start of my tangential wanderings.

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The Land Rover Series II master and slave cylinders arrived, and it was immediately obvious was that a deep spacer between the slave and the bracket was needed.

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Cheap hole saws are not ideal for this kind of work though luckily, I had an undersized one that would get me close enough before finishing with the boring head. (Note to self: cheap boring tools are equally eccentric in their behaviour).

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So far so good. All the time I was making the hole for the slave cylinder, I was trying to work out the best way to secure the bracket in the mill to create the hole for the clutch lever shaft bush.

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I made the bush a gnat's oversize, shrunk it into its housing and then cleaned up the internal bore to fit. The hole in the bracket was a bit of a fiasco - the tooling picked up a couple of times and I lost the centre. I got around it in the end and the ½mm gap all round was acceptable for tacking.

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Everything was going very well, and I was thinking about congratulating myself (always a risky business) when Mr Holmes reminded me that I hadn't yet addressed the return spring. This turned out to be the most difficult part of the whole operation and, need I tell you; I went off at a tangent with a neat but fundamentally useless idea that doesn't warrant column inches. And so the end of the umpteenth day.

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I was casting about for a robust spring when I remembered that the Riley brake and clutch pedal return spring was a possible candidate. Cut in half, the bracket slotted to anchor one end and suddenly all my clutch woes were as nought. Yahoo! I popped the bush in the lathe and stepped one side to the i.d. of the spring so getting it to sit parallel to the shaft.

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Though I haven't yet connected the hydraulics and exactly adjusted the throw of the piston's rod, I'm pretty confident that this is going to work, and I like the compact and tidy nature of the conversion.

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Though slightly awkward to assemble - I've made this special tool to pull back the return spring hook and slip it over the clutch lever - it's not an everyday maintenance job and provided I remember to face the slave cylinder's bleed nipple to the outside, all should be well.

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With the gearbox back in place, and the bracket being 6mm thick, I've sorted out three bolts of extra length to accommodate.

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I think this might be a Triumph Herald handbrake. It's now a bit longer and all I have to do is work out how and where to mount it for another problem solved.

previous post Making It Happen.
next post Here Comes The Sun(beam).

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