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A TR7 16V

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  • Location
    Lytham St Annes
  • Cars Owned
    1971 Herald 13/60 Convertible
    1973 Mimosa Dolomite Sprint
    1977 Factory TR7 Sprint

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Expert (4/13)



  1. I still want to know if swapping the master cylinder and keeping the push rod will move the pedal up or down. And the holes in mine are a bit worn - the 8mm clevis I think got sold is only tight in the pedal arm, and quite slack in the fork. I do see that replacement rods with forks are available, but I think I want a slightly bigger bore. However, I'm still worrying a bit that 3/4" is a more bigger than I want. I got a reply on the 5/16 UNF thread fork to fit the LR 0.75" cylinder, and it takes and comes with an 8mm clevis pin. I really do like the look of the pin clip it comes with. I feel like the R clip on the one I got to replace the one in the car sticks out too far and might split the boot in time. Graham
  2. Think that this one might be better: https://www.ebay.co.uk/itm/224547870126?hash=item34481895ae:g:g28AAOSwWl5dwqu- I'll ask them what the pin diameter is, as that's not given in the listing. Graham
  3. But then I lose the ability to adjust the pedal height. Will it naturally come to the same height with the same rod in a different cylinder? Graham
  4. The last two posts seem to suggest that increasing the pedal force by 1.44 won't be that big an issue. In which case the next problem is to find a fork with a 5/16th thread? Lots of M8 x 1.25mm pitch. Don't suppose anybody knows the thread on a Land Rover S2/3 handbrake link? Graham
  5. While I've got some clutch movement back by replacing the pedal, bracket, and clevis pin, I would like to see If I can get just a little more. So I was thinking of a bigger bore master cylinder then the 5/8th (0.625)" one I have in, which will get more slave travel for the same pedal movement, but stiffen the pedal a bit. Pete Lewis suggested a 3/4"e LR one as a cheap option, which they are. But they don't have the fork for a clevis pin. They aren't expensive either, but I don't know what thread is on the piston pushrod on the LR cylinder. The good thing there is there's an opportunity to use the thread to set the position of the pedal. But I recon that 3/4" bore will take 1.44 times the force to move the pedal, but, obviously, 1.44 times as much clutch movement. 1.44 times sounds a fair bit more force, but it's leg work and the pedal is light enough now. So I wondered about a 0.7" bore TR cylinder, which would only take about 1.25 times the force and still give me a bit more clutch movement. So, has anybody done any such thing and/or got opinions? And if anyone's used the LR one, can they give details of the clevis pin fork I would need and how much heavier the pedal becomes? Graham
  6. Just to check the size of thread on the outlet of the master cylinder is 3/8 unf? Graham
  7. I wondered if it would need some heat, but yours just pressed out. I'll give a try, though my vices are more modest than "Record" ones. Graham
  8. How'd you unseize the pins from the arms? Graham
  9. If you mean STC500100, I see those really are cheap. Will need a fork fitting I see, But even so, that's still cheap. Wonder how much control I get in setting where the pedal sits and goes down to. Is it likely to need a stop on the pedal, or is whatever limits the travel in the cylinder strong enough? Graham
  10. The issue with welding washers on both sides is the one, I think it was Colin, identified of the pin turning in the bracket rather than or as well as the pedal turning on the pin. But maybe shaketights would do instead of a welded nut and jam nut. Anyway, the replacement is in now, and I can confirm that, in the 1970 13/60 I have, the brake pedal and it's bracket fit where the clutch pedal should go. The old set was giving about 5mm of play at the pedal from the wear in the hole for the pin, which is seized in the bush, and another 8 or 10 from the assembly at the joint between the pedal arm and the master cylinder piston rod - a lot of that just from the clevis pin itself (is it meant to wear sacrificially?). The new 5/16th clevis was very tight in the replacement arm, if not so tight in the fork on the end of the rod. So I think the loss in pedal movement due to slack in the mechanism is less than a 1/4 of what is was. It's enough that, for now, there's no grunting going into reverse. BTW, has anyone fitted a bigger bore master cylinder, and are there any risks in pushing the slave too far? Graham Graham
  11. I'm still looking at how I might fix the worn clutch pedal bracket that's in the car. The replacement bracket and pedal arm do take a 5/8 bolt through the pivot - the unthreaded section of the 5/8ths bolt I have is the same diameter as the pin. i.e. 0.616" not the 0.625" I expected. In which case, a 3-1/4 DIN 931 bolt should have an unthreaded section the right length and can be shortened to the right length of exposed thread. It should have 1.5" of thread and 1.75" unthreaded, but the one I have is threaded 1.8" (like a DIN 931 over 6" should be) and only has 1.4" of unthreaded (so is too short). So a proper DIN 931 3.25" or a 3.5" threaded 1.8" like the one I've got at the moment. I don't think it will matter that the 3-1/4 bolt I have will have 3 or 4 mm of thread inside the bush. So I'm thinking of getting a 5/8ths thin nut welded on one outside of the bracket, and a 5/8ths washer or maybe 2 welded on the other outside. The bolt can then be screwed in so it's tight on the welded on washer, but doesn't nip the pedal; then locked with a second thin nut jammed on. I am wondering if that needs a shaketight washer between them. If the bush in the pedal arm is no good after being seized on the pin, that will need replacing. But at least they are available.
  12. I went to see if I can swap the clutch pedal and bracket, cos it looks a fairly easy job. I checked that all the screws will undo, and they will. However, the split pin was so solid in the clevis pin on the end of the master cylinder piston rod, the head came off first. There's enough of it left it won't fall out, but I've got to buy something to at least replace it. Does anyone have an opinion on the differences between these master cylinder rubber boots: https://www.ebay.co.uk/itm/371709323800?fits=Model%3AHerald&hash=item568b9a2a18:g:-6gAAOSwzYtglAuh and these: https://www.ebay.co.uk/itm/254854572363?epid=1816907236&hash=item3b5684294b:g:ut0AAOSwR5BbBUWJ ? Graham
  13. These 13/60 ones seem exactly the same, except for the bracketry for the brake light switch. That may stop the pedal coming up fully when used for the clutch. But thinking about it, the clutch pedal in the car is very near the same height as the brake when it's on the switch. And with no switch, the pedal would, if free from the master cylinder, come up well over an inch higher than the normal position, i.e. above where the clutch pedal stops now. So I assume there's some stop on the master cylinder or that end of the linkage. I can see how to fix the wear in hole in the clutch pedal for the master cylinder clevis pin - just use a bigger one. But fixing the wear in the holes in the bracket for the pivot pin has me a bit flummoxed. And that set would want a new bush and pin to make it tight as well. Graham
  14. I just looked more closely at the hole for the clevis pin to the clutch piston rod fork on this set I just got, and that's got quite a lot of wear. It's ovalled by about 1mm orthogonal to the length of the pedal, which would be about 5mm play at the centre of the pedal pad. So that would need the set drilling out and a bigger pin/bolt fitting. Whereas the same hole on the brake pedal looks fine.
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