DMF replacement?
Discussion
BorkFactor said:
I would be surprised if a petrol one needed a new DMF, but it is not unheard of.
Don't they usually rattle when the clutch is in or something like that when they are on their way out?
Thats what I was thinking. The DMF shouldn't wear out as such. Its just a fancy flywheel. If it failed I would have thought it would have different symptomsDon't they usually rattle when the clutch is in or something like that when they are on their way out?
98elise said:
They will find it hard to stall my car. The clutch slips if you put any strain on the drivetrain. Drive with a light right foot and its fine.
If it stalls then then it's probably the DMF as the clutch unless slipping a large amount will be able to stall the engine in a high gear.tercelgold said:
98elise said:
They will find it hard to stall my car. The clutch slips if you put any strain on the drivetrain. Drive with a light right foot and its fine.
If it stalls then then it's probably the DMF as the clutch unless slipping a large amount will be able to stall the engine in a high gear.
t and until you explain your logic no-one will believe you.tercelgold said:
If it stalls then then it's probably the DMF as the clutch unless slipping a large amount will be able to stall the engine in a high gear.
This makes no sense? A fully working clutch will stall a car in a high gear. A worn plate will not stall a car because it can't hold up under load. The DMF is effectively passive in the operation of the clutch. Its purpose is to damp vibrations.A failing DMF will rattle and the uptake of drive will be harsher than you are used to but with a slipping clutch that will be hard to gauge so the only test you can do atm is a noisy DMF.
With the gearbox out it's a lot easier to test as you can actually try and twist it with your hands etc.
If it was me I would be sourcing a solid flywheel as DMFs are notoriously expensive and hold no real advantage over a solid flywheel especially on a petrol
With the gearbox out it's a lot easier to test as you can actually try and twist it with your hands etc.
If it was me I would be sourcing a solid flywheel as DMFs are notoriously expensive and hold no real advantage over a solid flywheel especially on a petrol
98elise said:
This makes no sense? A fully working clutch will stall a car in a high gear. A worn plate will not stall a car because it can't hold up under load. The DMF is effectively passive in the operation of the clutch. Its purpose is to damp vibrations.
Then the clutch is working so the DMF must be failing and causing the problems. replace the dmf.Even if it is a petrol it may still need one, garages warn people as they then have no nasty surprises. There is a tool that LUK, who make 99% of all DMF's, that measures the amount of twist the flywheel allows. If it is excessive they will change it.
Wear depends on how it is driven as well as vibration. If there are lots of racing starts the inner part of the DMF rotates against the stop and wears it away.
Most quality mechanics, not fitters, would be able to do a simple rock and twist test, but most people want the reassurance of a piece of equipment.
If you try to stall a DMF equipped car with a unworn clutch it will stall.
Wear depends on how it is driven as well as vibration. If there are lots of racing starts the inner part of the DMF rotates against the stop and wears it away.
Most quality mechanics, not fitters, would be able to do a simple rock and twist test, but most people want the reassurance of a piece of equipment.
If you try to stall a DMF equipped car with a unworn clutch it will stall.
lexusboy said:
A failing DMF will rattle and the uptake of drive will be harsher than you are used to but with a slipping clutch that will be hard to gauge so the only test you can do atm is a noisy DMF.
With the gearbox out it's a lot easier to test as you can actually try and twist it with your hands etc.
If it was me I would be sourcing a solid flywheel as DMFs are notoriously expensive and hold no real advantage over a solid flywheel especially on a petrol
We're definately not getting any vibration. The clutch has always been very smooth on the car, and still is.With the gearbox out it's a lot easier to test as you can actually try and twist it with your hands etc.
If it was me I would be sourcing a solid flywheel as DMFs are notoriously expensive and hold no real advantage over a solid flywheel especially on a petrol
I'm looking to change cars in a few months so might go down the solid flywheel route if its needed.
Tercelgold is talking rubbish.
OP- it is £400-500 worth of labour just to remove and re-install the clutch. You'll pay that all over again if the DMF fails in a few thousand miles time, so it depends on whether the car is a long term thing.
I didn't even know petrol Mondeos had 'em, so I suppose you could do some research into whether they're as failure-prone as the diesel ones.
OP- it is £400-500 worth of labour just to remove and re-install the clutch. You'll pay that all over again if the DMF fails in a few thousand miles time, so it depends on whether the car is a long term thing.
I didn't even know petrol Mondeos had 'em, so I suppose you could do some research into whether they're as failure-prone as the diesel ones.
HustleRussell said:
I suppose you could do some research into whether they're as failure-prone as the diesel ones.
They definitely aren't - I did all the research when I bought a 2002 1.8 Mondeo 
It does happen, but nowhere near as common. A lot of people replace them as a matter of course while the clutch is being done, but I have no idea of the costs involved (mine was fine thankfully) so I couldn't advise whether this is a good idea or not!
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