COVID-19 Message Updated: 3rd Sept
Mail Order Customers:
Our carrier DHL is operating near normally across the world with its Air Express service. Allow an extra day for delivery (4 days for Australia and New Zealand), just in case.
  * For the UK only, Royal Mail are delivering the vast majority of orders on time according to our data, but is experiencing higher levels of staff absences, so there may some local delays.
  * We will be working normally and have a large warehouse full of parts that will help keep your car on the road. However, we are seeing some supply delays from factory lockdowns around the world.
Workshop Customers:
We have strict social distancing processes internally and disinfect daily (not least because we have staff in vulnerable groups). In the circumstances, we have had to close our waiting room. Our mechanics wear gloves at all times and we will disinfect your vehicle with our Zaflora sprays on handing back to you. We would respectfully ask you to show our staff the same courtesy. We also have full amount contactless payment systems.
  * In these times of fluctuating demand, it's highly advisable to book your vehicle in earlier than usual. We are currently very busy indeed.


Dual mass flywheels what they are for and how they work

One of the major issues all the manufacturers have is the dual mass flywheel (DMF) which seems to need to be replaced every time that you need a clutch and that puts the price of clutch replacement up to around £1000 which on a car that has probably done in excess of 100,000 miles will probably make it uneconomical to repair. So the first thing to understand is what a dual mass flywheel is designed to do. The dual mass flywheel is an aid to making the gear change on your car lighter and more positive while also making the engine and gearbox smoother and quieter. So how does it work, in order to make an engine smoother you need to increase the mass of the flywheel but as you do this the mass of the gear train effectively becomes less as a proportion of the total mass that is in motion and you will get noise, rattles and vibration from the gear train, in order to get round this you would traditionally have increased the mass of the gear train which in turn would mean that the syncro’s (the brake that matches the speed of the gears that are about to be engaged) also had to become stronger and there fore the gear change becomes heavier and more agricultural. To get round this you have to increase the mass of the gear train without increasing the mass of the gears, this is done by splitting the flywheel into two separate masses (hence the name “dual mass flywheel”), one mass that is attached directly to the engine and one mass that is attached directly to the input shaft of the gearbox, these two halves are then separated from each other by a damper which stops the natural vibration of a large high capacity, high compression engine being transferred to the gearbox.

So how much trouble are dual mass flywheels and when are they worn? Well if you own a Peugeot 407 2.0l diesel you may well find that you need a new one every 20000 miles or less while on Alfa Romeo’s they seem to last well part 100,000 miles without trouble, I can almost feel the engineers amongst you bristle at this next comment but bare with me, and even with this sort on mileage on them they can often go again (not best practice) as long as there is only slight tangential rotation in the secondary mass relative to the primary mass, however if there is any free play axially it should be replaced, however on later cars they have a fully floating dual mass flywheel with internal clutch adjustment and that is almost impossible to asses the wear on it. These late flywheels also need special tools to stop them from adjusting up while you are doing gear box repairs so beware!

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