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David Herbert

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David Herbert last won the day on June 19 2018

David Herbert had the most liked content!

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About David Herbert

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  • Birthday 04/02/1954

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  • Location
    Ayrshire, Scotland. previously Suffolk
  • Interests
    Heavy armour, plant, narrow gauge railways.
  • Occupation
    Retired engineer / odd job man

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  1. Could be caused by people putting EP90 oil in there. It eats bronze / brass even without a load. David
  2. In the 20s and 30s the Germans were building steam locomotives with Whitworth threads but metric head sizes. David
  3. And you have operated her for longer than the army did ! David
  4. As it says on the parts list, this is a special thread, invented by Leyland for that particular application. I used to work for Fodens and they invented their own threads for that kind of thing if there was no standard one that seemed right. Don't mess the nut up ! David PS, It couldn't possibly be UNF as that wasn't standardised until the early 50s. Before that the USA used American Standard threads from which UNF and UNC were developed but not all sizes interchange (like 1" UNF is 12tpi vs. 1"AF which is 14tpi).
  5. The small idler wheel below the sprocket was originally officially called the Tension Compensating Idler Wheel but that got shortened to Compensating Idler and then to Tension Idler which is a better term as it was sprung downwards by a small torsion bar but not linked to the rest of the suspension, unlike the Track adjusting Idler at the front of the tank which moves forwards as the front road wheel moves up, thus compensating for compression of the suspension and reducing nose diving when braking. The Tension Idler was to prevent the track bunching upwards between the sprocket and the rear road wheel when reversing, or when braking that track whilst going forwards. As the track is rubber bushed it is damaged by bending it sharply back on itself in the wrong direction. If driving forwards the tension of the sprocket pulling that part of the track will keep it straight however slack the track is. It does also contribute to guiding the track onto the sprocket and reducing flapping of that part of the track when coasting. They were kept in place for most of the US Army service life of M47s but were often removed by other users to reduce maintenance. David
  6. If you want to change a vehicle so that it differs from what is on the V5, just do it and then notify them in the way that it asks for on the back of the V5. If you are changing it TO what it says on the V5, just do it. Then the paperwork will fit the vehicle and everyone will be happy. Of course the insurance companies are getting fussy about modifications to vehicles being notified to them, which can even include factory installed optional wheels. David
  7. I used to buy bearings regularly for my business and EVERY time I would be quoted a price four times what I paid last time. When challenged they would ask me what I paid last time and without argument would more or less match it. Certainly it seemed that at that time there was a huge discount to be had and list prices were inflated to allow for it. A crazy way to do business ! David
  8. That is a good find ! My MW has a dipstick made of a sort of fibre board, dark grey and completely proof against petrol. Were there two types or was mine home made long ago ? David
  9. I suspect that there are many more failures of relatively new tires, simply because there are many more of them. Does this mean that all tires should be banned ? Also most preserved vehicles do not travel very quickly and anyone that can't control a blowout at those speeds really should consider whether they aught to be driving. Just my knee jerk reaction.... David
  10. I find it astonishing that these kind of parts are still out there to be found, so long after they were of any real commercial use. My first MV was a Bedford MWR which I acquired in 1970 and at that time there were almost no new spares available because the enthusiast infrastructure did not really exist. On the other hand there were lots of reasonably good trucks in scrapyards that weren't particularly rusty but had no use so they got scrapped. David
  11. Hi Glenn, A good thing with Clansman is that all cables that look the same are the same. If they have matching plugs on each end then both ends are wired the same so pin 1 goes to pin 1 etc. So all 12 pin cables are interchangeable except for length. The original cables supplied with the vehicle specific installation kit were each numbered in a series that was special to that kit and were labelled at each end with what they plugged into but were often replaced with non-vehicle specific cables that happened to be the right length or a bit longer. Unfortunately the 'CES: installation kit, electronic equipment, Clansman basic harness' for each vehicle gives a full list of components with NATO stock numbers but not lengths of the cables. Most of these lists are available quite easily (Ebay) David
  12. I don't recognize any part of the part number but I wonder if it is a bearing cap from a paddle wheel of a ship. There were plenty of paddle steamers in British service in WW2 and those in military service would have needed parts backup. I am not thinking of the bearings for the wheel itself which would have been much bigger but those of the actual paddles which are pivoted to the paddle wheel to give a feathering action as the wheel turns. The cap would have been retaining a split bronze bearing which was almost expendable because of the harsh conditions and difficulty of lubrication. David PS, Sorry I didn't read Graem's last post properly. I still think it is a bearing cap but some sort of asphalt mixing plant does sound possible.
  13. I strongly favour the Clansman ANR system (Active Noise Reduction). The boxes have gold coloured fronts, though for some reason not the 'Driver's Box' (which is labelled ANR if it is). Tanks are much noisier than say Ferrets and the ANR system really works. I don't believe there is an ANR headset/throat mic combination but there is, as Gordonb said, an ANR headset with no mic which are cheap and easy to find and could be used with a hand held mic, plugged into the other hole of the crew box. That would make the commander a bit less obviously modern than the standard boom mic. David
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