Engine and Transmission

Advertising Standards Authority acts on Diesel Particulate Filter removal


  1. Posted on February 9th, 2021 by Rob Marshall
  2. Ironically, while the Volkswagen Group is still bearing the brunt of the diesel-gate scandal, the aftermarket act of removing and/or disabling anti-pollution features on cars continues to be advertised openly. One of the most common of these procedures includes the removal of Diesel Particulate Filters (DPF – one of which is pictured) and tricking the […]

    Read more »

Low on fuel? Don’t wait for the warning light – Part 2


  1. Posted on February 3rd, 2021 by Rob Marshall
  2. Following GEM’s earlier blog on the road safety issues associated with low fuel levels (http://blog.motoringassist.com/news/low-on-fuel-dont-wait-for-the-warning-light/), Rob Marshall examines some of the technical implications:   While running a low tank of fuel can make your car more economical, if anything, due to a reduction in weight, it could cost you in the longer term.   One […]

    Read more »

Which is better? Timing belts or timing chains?


  1. Posted on January 11th, 2021 by Rob Marshall
  2. Popularised by overhead camshafts appearing on road car engines from the 1970s, the once durable last-for-life timing chain was replaced by an externally-mounted replaceable timing belt, which also synchronised the engine crankshaft movement with that of the camshaft, to ensure that the valves and pistons did not make sudden, unexpected and violent content. If you […]

    Read more »

Bad roads and corrosion ‘fuel’ sump replacements


  1. Posted on December 12th, 2020 by GEM Motoring Assist
  2. Regular readers of GEM blogs will know that poor road surfaces are not only bad for safety but also for your car. While tyres, steering and suspension components are the most obvious casualties, the humble engine lubrication sump is also suffering.   The sump’s main purpose is to retain the oil that protects the engine […]

    Read more »

Your guide to clutch faults – Part 2


  1. Posted on December 2nd, 2020 by GEM Motoring Assist
  2. An ailing clutch can be expensive to repair but Rob Marshall explains the high labour charges involved with a clutch change and advises on how to prolong its life. Despite being so essential, the clutch comprises of just three parts, known collectively as a clutch kit. A friction plate is clamped against the engine’s flywheel […]

    Read more »

Your guide to clutch faults – Part 1


  1. Posted on December 2nd, 2020 by GEM Motoring Assist
  2. A clutch that will neither engage nor release correctly can not only damage your transmission but, as Rob Marshall argues, an incorrect diagnosis can also cause your wallet serious harm. Rectifying clutch faults can be expensive, time consuming and inconvenient. On most front-wheel-drive models, replacing the clutch kit often requires the transmission and part of the […]

    Read more »

Your Guide to Servicing: Timing Belt Replacement


  1. Posted on November 29th, 2020 by GEM Motoring Assist
  2. Timing Belt replacement tends to be an expensive exercise that appears to make little difference to how a car runs, although failure and trying to live without it might prove impossible. Therefore, Rob Marshall advises that the outlay is both worthwhile and essential. WHAT IS A TIMING BELT? As comedians tell us, timing is everything […]

    Read more »

Your Guide To Car Tuning


  1. Posted on November 29th, 2020 by GEM Motoring Assist
  2. Car tuning is extremely popular but Rob Marshall argues that the uninitiated motorist should research the topic carefully to avoid not only wasting money but also damaging the car. Ever since the motor vehicle was invented, enthusiasts have devised ways to improve it. Although engines can be tuned to improve both their economy and efficiency, […]

    Read more »

Diesel Particulate Filters


  1. Posted on November 29th, 2020 by GEM Motoring Assist
  2. Few recent technological developments have caused as much angst among motorists, as diesel particulate filters have, but Rob Marshall advises that they are reliable, provided the car is driven appropriately. Thirty decades of diesel engine development has seen them transform from being sluggish and smoky to peppy and polished. While DERV-powered cars have the attraction […]

    Read more »

The behind the scenes damage that floods wreak upon your car


  1. Posted on November 27th, 2020 by Rob Marshall
  2. While many of us escaped the recent floods, some parts of the UK experienced torrential downpours and it is certain that most of us will be confronted by flooded roads at some point between now and next spring.   While there are many sound safety reasons for not entering deep water, such as the danger […]

    Read more »