Been working on the Triumph again this week.
I stripped the gearbox again, just to polish the cases. It's been sitting in the garage which is damp and cold and it was getting furry. It's now back to how it was before.
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Now it's the turn of the engine.
I built this motor in it's present form in 1990, but then the kids came along blah,blah,blah.
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I know it looks a bit crusty, but that's just cosmetic. All the hard work was done last time, so there's very little machining to do.
I machined the timing cover to accept an oil seal and circlip, replacing the OEM bronze bush.
This gives a much better feed to the big ends and it not affected by wear in the main bearings. It also produces 30% more oil pressure.
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The timing gears have all been drilled.
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The rockers lightened.......
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And I made some tappet blocks using phosphor bronze.
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I'm still deciding whether to polish the cases to match the gearbox or not.
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By hand, it will be a lot of hours. The cases are coming apart anyway, as I'm getting the crank/ rods/ pistons balanced at Basset Down.
The left hand casing will also need machining, as I'll be fitting an oil seal, so that the primary runs dry. I need to make a seal holder, but will have to wait until I can afford my BNR primary drive, to see how much room I have behind the front pulley.
The engine turns over by hand and still feels lovely.
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As I'm not going to be running a charging system, the dynamo is no longer needed. This leaves a gaping hole where it fits, so today I made a cover plate for it.
In the sixties, these were available as a piece of pressed steel, held in by a single bolt that was originally used to secure the dynamo. Racers used them all the time, but they were never any good really.
I made mine using an O ring and two bolt holes.
This is where the dynamo lived.
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I measured the hole.....
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Then found a lump of ali. I turned it a few thou less than the bore, then got out my o ring selection box. I found one about the right size. It doesn't have to match exactly, as you can adjust the groove in the cap to suit.
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Then I machined the O ring groove in the cap, so that there would be a little crush when fitted.
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Then I parted it off and faced the other side.
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Next, I offered it up and scribed around the casing and marked the hole positions.
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Then I milled of the bulk of the material, before linishing to shape.
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A quick polish.............
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And there it is, with the O ring fitted.
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This is what it looks like fitted.
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I also cleaned up the inlet manifold. It only took 15 minutes of polishing.
From this............
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To this.
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I also increased the spotface diameter to make it easier to get a spanner on the nuts.
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FAQ
I had to read it twice, too 
