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C4 HDi's and Dual Mass Flywheels - when should you replace one? |
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Dave_Retired.
 
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    Member No: #1
Joined: Aug 07 2006Location: Northumberland |
OK if you read the FAQ: HERE it explains how the DMF works. Please Note: Petrol C4's of all variants and the 1.6 92 BHP HDi DO NOT have a DMF Fitted. Only the 1.6 110 BHP and the 2.0 HDi's have them. DMF's do wear out eventually but there are factors that can increase the DMF's wear rate and shorten it's lifespan. 1. Using the car beyond it's design limits for towing etc. will place additional load on it. 2. Engine Re Mapping means that the DMF which was tuned to the engines original output is working harder due to the additional torque being pushed through it. 3. Anything that causes additional vibration such as a missfire, poor starting (low cranking speed) leaking injectors causing varying compression rates etc. will mean that the DMF is trying to absorb more vibration than it was designed for. 4. Your driving style. Driving in the wrong gear and allowing the engine to labour again cause additional vibration which can reduce the life of a DMF If you think that your car is suffering from additional vibration, rattles etc.it could be the DMF, but could also be a loose exhaust heat shield, a gearbox or engine mounting, timing belt tensioners or the air con compressor. If there is a rattle straight after the engie is sut down or as soon as it's started, then it could be the DMF and the only way to find out is to drop the gearbox and take a look. Visually look for signs of scoring on the flywheel, a burnt clutch plate, worn/damaged ring gear, heat damage, worn balance weights etc. Valeo who supply the clutches for the C4 range are now producing 'conversion kit's' using solid flywheels therefore eliminating the DMF but kit's aren't available for every car and the only way it will happen is if enough people ask them about it...... There are downsides to eliminating the DMF though, potentially more drive train vibration and faster wear elsewhere and increased fuel consumption. Whatever you do though, there is little point in replacing a failed DMF unless you eliminate the reason it failed prematurely in the 1st place. |
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PentlandC4
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 Member No: #13613
Joined: May 08 2010Location: Deepest Wiltshire |
I was reading an Honest John answer about DMFs recently, and he was hinting that not giving revs when pulling away from stationary, i.e. lifting the clutch and relying solely on the engine's torque to move away, will hasten the DMF's demise. | ||||
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BigJohnD
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  Member No: #82
Joined: Jan 22 2007Location: Hoylake |
PentlandC4 wrote ... I was reading an Honest John answer about DMFs recently, and he was hinting that not giving revs when pulling away from stationary, i.e. lifting the clutch and relying solely on the engine's torque to move away, will hasten the DMF's demise. That's interesting. My 110 had a DMF and I tend to pull away from stationary with the minimum possible revs and then when the clutch is fully engaged, power away. I never experienced anything to suggest the clutch/DMF was not behaving properly! BTW, was that HJ himself, reporting on feedback from DT readers, or was it the anti-diesel brigade in the forums who have never owned a diesel so know all about them? |
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pclark
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 Member No: #12537
Joined: Feb 18 2010Location: North Yorkshire |
There's an article on DMF's in the current issue (Feb 2013) of Car Mechanics magazine. It explains why vehicles have them, how they work, common problems and possible causes and what to do about them. | ||||
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PentlandC4
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Member No: #13613
Joined: May 08 2010Location: Deepest Wiltshire |
BigJohnD wrote ... BTW, was that HJ himself, reporting on feedback from DT readers, or was it the anti-diesel brigade in the forums who have never owned a diesel so know all about them? It was HJ himself... |
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BigJohnD
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Member No: #82
Joined: Jan 22 2007Location: Hoylake |
They are a pain when they go wrong… | ||||
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Bin-The-L-Plates
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Member No: #1556
Joined: Nov 12 2007Location: Stoke-on-Trent |
 I've gone through 3, although the first was a warranty job as it was dodgy from new. I'm a driving instructor, who's never had clutch problems in nearly 30 years of driving until I had a car with a DMF, so go figure. |
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