Dual Mass Flywheels- a pain in the neck ? Riginally to smooth out diesel engined cars heavy clutches

Dual Mass Flywheels

watch out if your clutch is slipping you may have a dual mass flywheels gone as well?

Dual Mass Flywheels-As with most tyre and auto centres these days we multi-task and carry out all types of repair work, we are blessed to have mechanics that are capable of doing the other more

Dual Mass Flywheels

Dual Mass Flywheels-A recent DMF that we have fitted

difficult kinds of jobs.

One of the main problems we are finding at the moment is the number of cars that are having clutch problems.This is no real problem to us and we take it in our stride, but the most frightening thing that is becoming prevalent is the increasing number of cars that are requiring Dual Mass Flywheels.

What are dual mass flywheels

In the old days we had a simple clutch plate mechanism that would cost perhaps £200 to £300 to repair, from a small to a large car, now thanks to modern technology we have clutch and flywheels that are part of the same unit. The problem is that you can diagnose a faulty clutch but not a DMF Problems (dual mass flywheel). This seems to affect all makes of vehicles we have fitted them on VWs and Toyota’s this week alone, also on Mercedes.

The idea came out to accommodate the modern demands of the lightweight diesel engines, modern motorists demand their diesel engine runs just as smooth as a petrol engine, also giving better fuel consumption. The DMF acts like a damper between the engine and the gearbox to give a smoother ride when changing gears on a manual transmission system.

Basically, there are two types of DMF. One is made up of a primary and secondary flywheel containing springs and cushions. There is a ring between the outer and the inner flywheel that allows them to slip, this is to stop any damage to the transmission when any torque loads exceed the pressure of the vehicles rating of the transmission.

Dual Mass Flywheels

Of course, the ring is the weak spot and can wear out when too much continual engine loads are applied. We find that this could be the reason that problems seem to occur mostly in people carriers.

Of course, the second type has planetary gearing. Specially made for vehicles with low-revving engines. Hence, that give out stronger vibrations when doing low revs. This type should give much smoother gear changes on diesel engines, similar to the same performance as a petrol engine, also giving a better fuel consumption.

I hope that this is informative and that you don’t need one replacing, but if you do look forward to a big garage bill DMF Failure.

 About Eric Roberts

Hi, I would like to introduce myself. I have worked in the Garage and tyre industry now for 40 years.

 

 

 

Ford Focus Duel Mass Flywheel – Driver heard a noise when clutch pedal pressed?

Ford Focus Duel Mass Flywheel, clicking noise?

Ford Focus Duel Mass Flywheel

Alex splitting the gearbox to get to the Ford Focus Duel Mass Flywheel

The driver of this Ford Focus presented his car to us. He explained that he could notice a slight change of noise in the sound of the engine followed by a sort of ticking noise?

When asked when the noise occurred he said that it was when started to press the clutch down, to about halfway. Then after the halfway point the noise clears up? The same happens when the clutch is released.

When the car engine is idling, or when you are just driving along, then there is no noise.

Then when your foot is off the clutch (either in neutral or driving in gear) there is no noise.

He said that he noticed for the first time, about a month ago. Ryan my service manager thought straight away that the problems pointed to the clutch and perhaps the Ford Focus Duel Mass Flywheel.

The Ford Focus Duel Mass Flywheel is made of many small components and clicking or ticking sounds, point towards the DMF (duel mass flywheel). The sound was only slight and the noise was covered by the car radio.

Ford Focus Duel Mass Flywheel

At first we recommended that the guy should leave well alone and to see if anything else would develop. He agreed with us and went on his way.

We never saw the car again until a month later? This time the noise became a little louder.

Ford Focus Duel Mass Flywheel

Ford Focus Duel Mass Flywheel

Ryan still suspected the Ford Focus Duel Mass Flywheel as being the problem. We took the car in and split the gearbox from the Focus engine to inspect the DMF and clutch. The clutch release bearing and slave cylinder were examined and found to be OK.

Some reasons for the diagnosis of a problem with your Duel mass Flywheel are as follows:-

1) If you have a slipping clutch; if the cars revs become higher but cars speed does not increase, or it feels like you are riding the clutch when driving along or changing gear. Or sometimes you can smell the pungent smell of the overheated burning clutch.

 

2) Strange unfamiliar metallic noises (sounds like a rattling chain or bag of knife and forks being shook about). This noise will stop when the clutch is depressed then return of release.

3) If your dual mass flywheel has been wearing for a while then your starter motor may start to slip/spin, when you are starting the car.

The driver with the Ford Focus Duel Mass Flywheel problems came to us in good time. The DMF had started to break up and was replaced, along with a new clutch plate. So if you do hear these noises take it along to your local garage to be examined.