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David Herbert

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Everything posted by David Herbert

  1. Or a Christmas Reindeer ? The truck is a Canadian Military Pattern (CMP) Ford with what is called a Number 13 cab (the final style). Probably a 3 ton F60L. The British army had them in considerable numbers. David
  2. Jarrod, Thanks for posting, I hadn't seen that before though I did know of the convoy. A great selection of vehicles. David
  3. In the last two photos at least you can clearly see that at the bottom it is ribbed rubber matting that is not properly glued to the armour. David
  4. If you are looking at modern seals you need an 'R23' type as they have a little lip that helps keep dirt away from the actual seal part. Don't worry about the thickness, just the internal and external diameters measured from the case and the rotating part. It is important of course that the surface that runs against the seal is very smooth or it will chew through any seal in no time. The precise diameter is much less critical as the oil seal will accommodate to it within a small tolerance. David
  5. I think that it is inevitable that some splashed oil will get past the rear bearing, simply because there is nothing to stop it. However it will not be under any pressure and if the rear seal is working the cavity between the bearing and the seal will fill up to level with the bottom of the bearing (a little higher than the bottom of the seal surface) and lubricate both the bearing and the seal as soon as the truck moves. It is certainly there both to stop oil getting out and dirt and water getting in so does need to function. There is no reason not to use a modern seal in its place if you can get one that fits but don't disregard leather seals, they work fine given a smooth surface to seal against, and as long as they are not allowed to dry out by not being used for years at a time. The gearbox looks great though, good find. David
  6. David Herbert


    Yes. It's an American WW2 petrol can. David
  7. Well that's a good start. A rolling chassis will turn up somewhere having been a farm trailer or similar. Then you need a transmission and diff. The rest is make-able. Easy ! Good luck, David
  8. Referring to the Mack recovering the AEC tipper it is hard to see how the AEC got rolled because the ground looks relatively flat and big trucks in those days didn't exactly go fast. It is amazing though how even the quite crude colouring of the images does bring them to life. I would also add that the air springs on the MH tractor unit were not that uncommon in the late thirties / early forties, mostly on American trucks but also British ones. Thank you B series for posting these photos. It is good to see photos of such a varied selection of vehicles in the normal course of their use and have a commentary about what the background was. David
  9. Referring to the very rare original PASS plate. I think the seven white circles are where the tin of white paint stood while it was being used ! David
  10. I think that is a correct translation except that it is not American but a British Crusader ! As in the background of the photo above it. David
  11. Looking back through this thread I see only four holes in the crank case for valve tappet guides. I am guessing that the inlet valves are opened by suction against a very light valve spring ? David
  12. I think that the tool in the red case is for measuring the output of diesel injector pumps to check that each element is pumping the same quantity of fuel. It may also be possible to measure the leakoff from each injector by conecting the pipes to the leakoff ports on the injectors. No idea what the blue thing is though. David
  13. Jeremy, What an excellent and full account of this subject. Thank you for posting ! David
  14. Ruxy, Quite right ! Sorry for not reading your post properly. Must try harder ! David
  15. An alternative explanation of the reference to Jewels is that in clockwork watches and high quality clocks it was common to use semi precious stone in tiny pieces as bearings for the shafts that moved relatively quickly. As a measure of quality there would be a marking that proudly announced how many jewels were present. It is possible that early speedometers used jeweled bearings for the needle shaft but the practice died out in the fifties as unnecessary complication. The coal pretending to be the glass seal used to be rubber. Luckily materials have moved on since then. I think that the blue inside of the case is to make the night illumination look less yellow and more white than it would otherwise. We forget just how yellow car headlights used to be before halogen ones came in. David
  16. And photos 3, 9 & 11 are all Grants. They have different turrets to Lees as they were built to British orders with provision for British radios and other small differences. Lees have a more upright turret with a tall rotating comander's cupola on top of that. Photo 10 is a Crusader but the truck on the extreme right is I think a 3ton Dodge or Chevrolet. David
  17. In support of Richard, since L and LS refer to carbs for 'heavy commercial models' I suspect that N refers to the application - possibly military ? I wonder what W stands for. Possibly Waterproof ? David
  18. Yes, but you have the casing. I would bet though that the difference is very minor and that all the internals will interchange directly. It would not surprise me if say Universal Carrier boxes weren't basically the same box, along with virtually every Ford V8 truck of the period. This is Ford, everything is standardized. David
  19. I feel that you could reuse those bits if you really had to but they won't last long and will put lots of swarf into the oil as they bed in. It all depends on budget but this was a relatively common gearbox in its day so it must be possible to find another. If you replace only the really bad gears they will be messed up by the old gears that are just fairly bad. A bit of pitting on the teeth won't do any harm but when it exceeds 10% of the contact area I think you have to regard them as scrap. Sorry ! David
  20. I worked for Fodens in the mid 70s and they were still developing the two stroke engines. I remember a new cylinder block pattern being built in the pattern shop. Also there was considerable co operation between Fodens and RR and they routinely did specialized work for each other. The castings for the prototype RR Wankel tank engine were made by Fodens when I was in the foundry there. This engine showed great promise but never went into production, presumably because of reliability problems. The FD12 was indeed two 6 cylinder engines geared together in much the same way as the Detroit twin 6-71. Actually the whole Foden 2 stroke concept was very much inspired by the Detroit 2 stroke and if anything was even louder ! David
  21. My gut feel is that the open spoke wheel is the earliest, then the very closed wheel then the two round hole wheels. My reason is that the brake ventilation holes get steadily larger which I think would be the natural evolution. The closing of the open spokes and then somewhat opening them up again could be for casting quality reasons. I wonder how many people will notice that you have odd rear wheels when the bus is being displayed ! David
  22. That must have been interesting on the Deltic engine, three cranks rotating in opposite directions to each other ! David
  23. It wasn't the actual fuel that did the damage because they were normally run on diesel. The problem was that to be able to run multifuel the cylinder had to generate pressures and temperatures that would burn low grade fuels but also withstand the much higher pressures and temperatures generated by burning petrol and also unfortunately diesel. This turned out to be rather beyond the metallurgy available. When the multifuel requirement was removed a lot of detail redesign was done to optimize the engine for diesel, particularly on the L60 which had the biggest problem and the reliability went up as did the HP. The increase in HP though was not enough to keep up with the increase in weight of the Chieftain which had had a lower than intended power to weight ratio from the start. The result was the development of the CV12, still used in Challenger 2. David
  24. I understood that the Junkers engine was used in airships not aircraft but have no evidence for this. It is frequently given as the inspiration for the RR engines but again this could be a bit like the story that the Churchill flat 12 engine was two Bedford truck engines bolted together despite the fact that the truck engine made 72hp and the tank engine 360hp and was a we bit bigger ! David
  25. Mike, my point was that they are vertical not horizontal. I agree that 'opposed piston' differentiates them from the type of engine in an original Volkswagen Beetle but I can't think of a vertical engine with a single crankshaft in the middle. For those that don't know the other engines mentioned, the Routes TS3 had three horizontal cylinders with opposed pistons each connected by two connecting rods and a pivoted lever to a single crankshaft below the cylinders. Amazing sounding engines. The Deltic engine had three crankshafts in a triangle with three cylinders between them each containing two opposed pistons. I don't remember how many cylinders 'long' the engine was but it produced vast amounts of power when it worked - typically British ! David
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