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RIP John Haynes

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RIP John Haynes

Old 19th Feb 2019, 15:34
  #41 (permalink)  
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The stoplamp switch on my 14-year=old Peugeot 'failed' immediately before the MOT was due.
A new switch arrived from eBay (99p post-free).
The manual stated that removal of the fascia (after disabling the steering-wheel airbag) was necessary - which suggested that a permanent MOT fail would end the vehicle's life.
Squirting WD40 up into the switch brought the switch (and the car) back to life (and it lived on for several more years).
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Old 19th Feb 2019, 16:14
  #42 (permalink)  

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I am trying to work out how the outside tyre would lift off in a corner ??......I think there are CV joint equipped halfshafts now available to replace the Spitfire type rubber doughnuts. I think they used them on Wheeler Dealers once.
I didn't say that the tyre lifted off. The tyre "tucked under" so that it ran onto the outside shoulder of it's tread, then onto the sidewall.

The Spitfire never had rubber doughnut couplings - they were the Hardy Spicer metal type, as on a propshaft. You are possibly thinking of those fitted to the Triumph GT6 (different setup altogether), the Lotus Elan or the Hillman Imp, all of which did have rubber doughnuts.

Some Spitfires were retro-fitted with simple straps hanging down from the bodyshell to the rear suspension uprights which limited the amount of "droop" of the half shafts so they couldn't tuck under. Some owners fitted a modified, flatter rear spring to give more negative camber on the rear wheels.
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Old 19th Feb 2019, 16:32
  #43 (permalink)  
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Some owners fitted a modified, flatter rear spring to give more negative camber on the rear wheels.
Probably the mod my mate fitted. I think the previous owner put it on its side on a grassy bank while cornering a little enthusiastically.
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Old 19th Feb 2019, 18:54
  #44 (permalink)  
 
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The original VW Beetle used to jack itself up going around corners when pushed. It would end up on its side in the same way.

Nothing wrong with rubber doughnuts; Beemers used them.
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Old 19th Feb 2019, 20:21
  #45 (permalink)  
 
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Only ever owned one Haynes manual - for a J Reg Renault 12 bought around 1982. 95,000 miles when I bought it. Kept it going for around 10,000 miles before it expired, but not before getting about 8,000 miles on expenses at around 15p a mile. Result back then.
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Old 19th Feb 2019, 20:38
  #46 (permalink)  

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Originally Posted by Fareastdriver View Post
The original VW Beetle used to jack itself up going around corners when pushed. It would end up on its side in the same way.

Nothing wrong with rubber doughnuts; Beemers used them.
They still do. But using a better design than the old types, now with an outer metal cage to hold them together.

Triumph Spitfire drive shaft couplings are of the metal Hardy Spicer type UJs with a four legged spider running inside four metal cups with small needle rollers taking the load. They have no rotational "give" in them. There is only one at each side of the car, fixed to the differential, which is fixed to the chassis. This allows the driveshaft to pivot up and down as part of the suspension - it's a "swing axle" setup. This is unlike the design of a prop-shaft where there is a UJ fitted at both ends.

The Triumph drive shafts themselves are fixed directly into the inner wheel hub assembly and by design they are fixed at right angles to the wheel bearing. This means that the driveshaft, hub, brake drum and wheel pivot around the UJ at the diff output coupling. The entire assembly, of considerable rotational mass, is thus is forced to constantly accelerate & decelerate (Hooke's joint effect). The greater the deflection of the shaft (as constantly occurs with normal suspension up/down pivoting movement from "neutral"), the greater become the stresses on the UJs. This destroys them in fairly short order because that type of coupling is not designed to take such large stress reversals. If Triumph had fitted a UJ at each end of the drive shafts the Hooke's joint effect would be cancelled out*. The entire rear "swing axle" suspension was obviously designed for low cost rather than car handling or mechanical longevity.

The only good thing for me is that I am now more than capable of DIY replacement of Hardy Spicer UJ couplings.

*This was done one the Mk2 GT6, a "Rotoflex" rubber doughnut was fitted to act as a second "UJ".

Last edited by ShyTorque; 20th Feb 2019 at 10:21.
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Old 20th Feb 2019, 08:20
  #47 (permalink)  
 
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Originally Posted by ShyTorque View Post
I didn't say that the tyre lifted off. The tyre "tucked under" so that it ran onto the outside shoulder of it's tread, then onto the sidewall.
I stand corrected.

The Spitfire never had rubber doughnut couplings - they were the Hardy Spicer metal type, as on a propshaft. You are possibly thinking of those fitted to the Triumph GT6 (different setup altogether), the Lotus Elan or the Hillman Imp, all of which did have rubber doughnuts.............
I am sure you are right. Iíve never owned any of the cars you mentioned, but helped a friend once. He must have had a GT6 then - it was a very long time ago. I remember fannying around for hours, messing with jubilee clips and whatnot to get the damn things on.
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