Triumph TR4 - Gearbox Rebuild: Critical Measurements | Roundtail Restoration

[@ericpfiffner5615]

Top notch engineering on those Fisher Specialty Tools!

[@roundtailrestoration]

Lol, thank you. I was pretty happy with it. Glad there was a lot of junk around that barn.

[@davidplummer2477]

Nice work Chris!

[@roundtailrestoration]

Thanks David and thanks for watching!

[@jfjeepyjrebirth6262]

Very interesting video!! Keep it going!!

[@roundtailrestoration]

Thank you and thanks for watching!

[@triumphrestoration7403]

I was thinking as you jad to measure and subtract, yiu could slice part of the rim of the tophat, and use that for measuring access. But I like the dial indicator suggestion. Nice video!

[@roundtailrestoration]

Thank you. The feeler gauge method definitely wasn't going to work.

[@davidplummer2477]

I used a dial indicator to measure end float of the gears on the bushes and main shaft. I also leaned to the minimum standard to keep the gear movement to a minimum so it is less likely to break the top hat bushing.

[@roundtailrestoration]

Cool. Did you do it when it was all together?

[@rice_219]

Hi Chris, happy thanksgiving over there from the UK! Another great video to enjoy. Just wondered, did you manage to sort out your Spitfire diff out in the end? I've found your videos immensely useful in the process of rebuilding mine. Thanks!

[@roundtailrestoration]

Thank you! Unfortunately, no, I could never get the mesh pattern right. All of the measurements appear okay, but not matter what I did, I couldn't get the pattern right. I even tried to make the pattern move, putting all of the shims on one side and all of that, but no change. Makes me feel like I'm not doing something right, but I don't know what it is. I'll probably try again at some point, but for now I'm taking a break from it. Sorry I couldn't finish it up.

[@rice_219]

​@@roundtailrestoration No need to apologise. Your videos have been immensely useful. I'm almost at the final stages for the first pattern check. Hopefully I'll strike somewhat lucky, otherwise I'll get busy to make it work. I'll probably post a blog of the project efforts once finished. My diff is a 3.63 for my daily driver 1977 Spitfire 1500 so a fair bit later than yours and uses a collapsible spacer on the pinion. I picked this unit up near Bristol with a good condition CW and pinion for £60 and have completely rebuilt it in my kitchen 😂

[@roundtailrestoration]

@@rice_219 Thank you. I'd be interested to check out your blog post. Maybe I can find some way to do it differently. Cheers!

[@alanm.4298]

Great info, Chris! Thanks! One thing... could you provide a link to the Greasy Hands Garage site you mentioned? Or more info about the site? I Googled it, but only found an unrelated site.

[@roundtailrestoration]

Hey, Alan. They are all on the Vintage Triumph Register website. I don't think you need to be a member to download the articles. You can find them (and a lot more stuff) here: vintagetriumphregister.org/maintenance/. Scroll down towards the bottom.