thank you chaps for your prompt and consistent answers :)
MTC
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Before any PCV [bus] starts its first sevice of the day the driver has to make several checks seeing that the wheel nuts are not starting to loosen is one of them and as touque wrenches are not on hand these yellow arrows are deemed to be the best way of checking
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You used to be able to get tyre valve caps that could be preset to a value and indicate if pressure had been lost. Struck me as a good idea, but they seemed to disappear, perhaps because they didn't seal well enough (providing a self-fulfilling prophecy!).
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You can still get those caps for about £10 a set.
tinyurl.com/2whn8g
David Jeffrey Spetch
PS Be good, be strong!
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Yep, a visual checking aid to show whether the wheel nuts are coming loose. The arrows should be more or less pointing at each other all of the time. If you see one that is pointing at a different angle then you know that it requires further investigation.
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Certain bus companies who use these devices exploit their prescence to see if their drivers are doing the walk around check properly. They move one or more out of place. If it's not noted, the driver is asked pulled up about it.
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Certain bus companies who use these devices exploit their prescence to see if their drivers are doing the walk around check properly. They move one or more out of place. If it's not noted, the driver is pulled up about it.
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They are also starting to be used on railway line nuts and bolts.
V
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They are also starting to be used on railway line nuts and bolts. V
That is, if they bother fitting the nuts and bolts.
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"You can still get those caps"
Thank you for that, David. I had no idea they were still around.
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You used to be able to get tyre valve caps that could be preset to a value and indicate if pressure had been lost. Struck me as a good idea but they seemed to disappear perhaps because they didn't seal well enough (providing a self-fulfilling prophecy!).
They've disappeared because kids steal them.
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Those plastic wheel nut things look awful. But the plain wheelnuts look bad too. All London Transport buses used to have a ring on the front wheels to hide the nuts (so did AEC lorries). MUCH nicer. And LT buses used to have a disc on the rear wheels to cover the hub. Class act.
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Mine certainly disappeared. When I left the car for an hour in a main street in Weymouth.
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Before any PCV [bus] starts its first sevice of the day the driver has to make several checks seeing that the wheel nuts are not starting to loosen
It was noticeable on a recent trip to WaltDisneyWorld in Florida that the Disney bus drivers did a walk around the bus at *every* changeover, and they gave each wheel a very good looking at.
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As Bill Payer says, a visual check by an experienced eye is good. These plastic pointers are OK and they will show a moving wheel nut, but long before this happens, there are other signs of looseness such as rust staining and / or unusual shiny bits. Fancy wheel trims covering the nuts don't help.
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Having had a lorry wheel come loose (but not off, thank goodness!), I think these yellow pointers are a brilliant idea.
Wheel nut rings like AEC etc. used to fit didn't hold the nuts in place, if I remember right, they just covered them. That too is a safety thing as rotating exposed wheelnuts on lorry front wheels can do a lot of damage to car or bus bodywork if they make contact. Anyone who saw Hypnodisc on Robot Wars will know what I mean!
The transport company I worked for many, many years ago had more than one case of lorry wheels coming loose. I know that heavy vehicle wheel-nuts are prone to working loose but I always had a sneaking suspicion that sabotage was a factor in some wheel-loss cases.
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