Car Mechanics November 2021

Car Mechanics is the UK's only car magazine with essential advice on maintaining and repairing popular makes and models. It’s an invaluable motoring resource that appeals to both the DIY car enthusiast and the more experienced motor trade professional. Car Mechanics has helped save money for our readers every month since 1958. Each issue includes a wide range of in-depth features written in a clear, straightforward manner: • Readers’ motoring-related problems answered for FREE • Real-life motoring dilemmas from our man in the garage trade • Electronic diagnostics delves inside a different modern vehicle each month to explain its management system • Survival Guide looks at new and used component prices for a particular vehicle • Used Car Focus is an in-depth buying guide on a specific make and model • Service Bay covers a full service with close-up images and comprehensive descriptions • Project cars are a major part of the structure of the magazine as we buy, fix and sell different vehicles over a period of months So if you're into saving money and being a home technician, Car Mechanics will help you out - guaranteed!

Land:
United Kingdom
Sprache:
English
Verlag:
Kelsey Publishing Group
Erscheinungsweise:
Monthly
4,21 €(Inkl. MwSt.)

in dieser ausgabe

4 Min
ds3 dilemma

Email martyn.knowles@kelsey.co.uk Follow us on Facebook @ Car Mechanics ► I had Rob Hawkins stay-over for a few nights while he dropped off the project Jaguar XF (he says he has finished with it); help do a clutch change article on my Toyota Corolla Verso; drive to Canterbury to photograph a Jaguar MkII before returning back to Leeds via BCA Blackbushe to help fetch our latest project car – a 2011 Citroën DS3 1.6 HDi. It was while we were eating in the evening that my British Car Auction app pinged up a notification that this Black and White model was about to be sold. I had seen the bodywork damage via pictures and its description, so was hoping to win this car for much less than the CAP Clean of £2925. The…

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17 Min
continuously variable transmission

While many people view the Continuously Variable Transmission (CVT) as a fairly recent development, its history is almost as long as that of the motorcar. In North America, H. C. Spaulding patented an infinitely variable gearbox in 1897, which utilised a drive belt and a pair of conical pulleys. By manipulating a series of levers, the driver could alter the gearing, by varying the belt’s position infinitely between the larger, or smaller, diameter portions on the pulley. The system found favour in industrial machinery and, while some sources acknowledge the intention for a motorcar application, no examples are known to have been made. Meanwhile, in France, Gustave Fouillaron used a pair of variable pulleys to power the vehicle that bore his name in 1901. Yet, the system still had to be…

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2 Min
how cvts work

► As an internal combustion engine generates maximum torque at certain crankshaft speeds, a well-engineered automatic transmission must hold the revs at this optimum point for maximum efficiency and then reduce them for the highest fuel economy at cruising speeds. While other types of automatic and automated manual gearboxes do this in stages, the stepless nature of CVT (in theory) is a more efficient method. In comparison, CVT gearboxes tend to be relatively uncomplicated and suffer from fewer parasitic losses, which is why their use was perfect for small engined cars, as well as lawnmowers, golf buggies and motor scooters. Regardless of vehicle age, the basic operating principles remain the same but they are easier to visualise, considering the original DAF/Volvo layout. Each belt and pulley arrangement is comparable with the…

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2 Min
what goes wrong?

► Should you be unfamiliar with driving CVTs, do not presume that the disassociation between road and engine speed indicates a fault. The original rear-wheel-drive DAF/Volvo layout was fitted to vehicles that are mainly beyond the remit of CM, so their deep analysis is more appropriate to a classic car magazine. A whirring sound, encountered while driving these early ‘rubber band’ cars, is normal, caused by the belt/pulley interaction. Yet, vibrations could indicate a failing belt, or a more serious mechanical fault. A similar noise can also be present on modern CVTs too, although the enclosed nature of the main parts means that gaining access is considerably harder than the more DIY-friendly van Doorne layout. Despite modern CVTs appearing simpler than other alternatives to manual gearboxes, Kenny Crossley of STA Aylesbury…

1 Min
preventative maintenance

► While CVTs are far from silent, mechanically sympathetic owners should listen for any worsening, or unusual noises. As with any component, prevention is better than cure and so investigate any changes in pitch, or intensity, as soon as possible. Despite their relative efficiency, CVTs expose their oils to both high temperatures and pressures. The metal-on-metal contact between the belt and cones introduces a relatively large amount of fretting, causing metal fragments to circulate with oil. Unsurprisingly, the majority of CVT faults are caused by failure of the lubricant. Apart from ensuring the correct oil is used and does not fall below the specified minimum level, STA recommends complete fluid and filter changes every 30,000 miles, or sooner. Thankfully this is not a specialist task, although renewing the filters necessitates removing…

1 Min
common diagnostic errors

► As with many other aspects, discovering and addressing faults early can reap savings. Being methodical and starting with the simplest solution first must also be the priority. Even garages make these fundamental errors. STA Aylesbury reports that some technicians do not even perform full diagnostic checks, before committing the owner to the expense of removing and overhauling the transmission. As modern CVTs are controlled electrically, accessing the fault codes through the EOBD port is the best way of starting. Be wary that basic fault code readers may read engine management faults only and not those stored within the transmission control module (TCM). Keep a record of any fault codes, erase them, undertake a test drive and see if any remain. It will help you immensely if your equipment can also…