How to tell if a dual mass flywheel is bad?
Visual Inspection of a Dual Mass Flywheel
- Check the friction surface for excessive heat checks and scoring.
- Check for excessive grease loss due to overheating.
- Check for visible damage including the ring gear, and other parts found inside the bellhousing.
- Check the rotational free play.
- Check for secondary plate rock.
What can go wrong with a dual mass flywheel?
There are many reasons why a dual mass flywheel can fail. The main reasons are: Heat – Excessive heat is a big cause of most dual mass flywheel failures. A slipping clutch generates heat; if your clutch is worn, you can still save the flywheel if you get the clutch replaced early enough.
How long should a dual mass flywheel last?
We asked AA technical specialist Vanessa Guyll to explain the issue. She told us: “David’s Vectra uses a complex dual-mass flywheel. These smooth out the vibrations from modern, powerful diesel engines. They’re not as reliable as solid flywheels, but should last at least four to five years.”
When should I replace my dual mass flywheel?
That’s why many experts recommend replacing a dual mass flywheel when changing a clutch – especially if the flywheel has more than 80,000 or 90,000 miles on it. The flywheel should be considered a wear item just like the clutch, and should be replaced when a new clutch is installed.
How long can you drive with a bad DMF?
All depends how the clutch and DMF have been treated driving wise. I could kill one in five minutes or treat it correctly and it could last 200K miles.
How did the dual mass flywheel come about?
In the old days, this would be solved simply by increasing the size of the flywheel, clutch set and consequently, the gearbox. But, in recent times the auto industry has been dominated by downsizing. The dual mass flywheel is born out of that idea.
Where is the hydraulic slave cylinder in a VW?
The external clutch slave cylinder design in this car bolts to the transmission. The hydraulic slave cylinder actuates the clutch release bearing through a pivot arm located inside the bell housing. If the slave is unbolted and pulled to the side as an assembly, there is no need to bleed the system.
Why do I need a bigger flywheel and clutch set?
This meant that a bigger, more powerful engine, needed a bigger flywheel and clutch set. In the old days, this would be solved simply by increasing the size of the flywheel, clutch set and consequently, the gearbox.
Can a pressure plate be removed from a flywheel?
The old dual mass flywheel/pressure plate assembly is considerably heavier than a single mass assembly. While it is possible to reach in and remove the flywheel bolts and remove the old flywheel/pressure plate assembly as a single unit, you may nd it more manageable to remove the pressure plate first to split the weight.