Dicky Posted May 15, 2014 Share Posted May 15, 2014 I posted a couple of weeks ago regarding how many miles members are getting from their clutch and quite a few are getting high milage. I've also read posts in the past about changing the flywheel along with the clutch as a matter of course. Is this really necessary if your a steady driver or are the Z flywheels only good for the life of a clutch. Changed the clutch in the wife's Zafira last week, admittedly it's not in the same league, but her flywheel looked fine after 80k miles so left it in. Just thought I'd ask because I'd hate to buy a new flywheel only to find the old ones ok Quote Link to comment Share on other sites More sharing options...
MITZ@CougarStore Posted May 15, 2014 Share Posted May 15, 2014 Always advisable to swap out when doing the clutch but you can assess the flywheel at the time of change... Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted May 15, 2014 Share Posted May 15, 2014 what actually wears out on the flywheel? Quote Link to comment Share on other sites More sharing options...
mikejbry Posted May 15, 2014 Share Posted May 15, 2014 (edited) The clutch plate is pushed against the fly wheel when the clutch is engaged, the more you slip the clutch, the more the friction material on the clutch wears against the fly wheel, and the faster the surface of the fly wheel itself wears. . Edited May 15, 2014 by mikejbry Quote Link to comment Share on other sites More sharing options...
Keyser Posted May 15, 2014 Share Posted May 15, 2014 (edited) The stock fly is also a dual mass and has 2 plates attached by springs a cush-drive system to stop the pickup being so harsh - these springs wear out over time. Edited May 15, 2014 by Keyser Quote Link to comment Share on other sites More sharing options...
gsexr Posted May 15, 2014 Share Posted May 15, 2014 Here yer go Since their adoption by most manufacturers, primarily for their diesel models, a dual-mass flywheel (DMF) differs from the more conventional ‘solid’ type, by having a flexible damper built within it. Intended to absorb stresses from the engine and transmission, they can fail prematurely, causing a metallic ‘clanking’ sound and/or vibration to be felt at certain engine speeds. It is recommended by many technicians that dual mass flywheels are replaced at every clutch change. Still, excessive clutch slip can put undue stress on the dual-mass flywheel and reduce its operating life. Basically its the springs inside it that wear. 1 Quote Link to comment Share on other sites More sharing options...
Dicky Posted May 15, 2014 Author Share Posted May 15, 2014 Well that's interesting. I've read post where members have talked about dual-mass flywheels but didn't know what they were. I can see now the good sense in changing it with the clutch. Thanks for your help, I'll defo be changing it when the clutch finally lets go. Quote Link to comment Share on other sites More sharing options...
The Trouser Posted May 16, 2014 Share Posted May 16, 2014 Since their adoption by most manufacturers, primarily for their diesel models, a dual-mass flywheel (DMF) differs from the more conventional ‘solid’ type, by having a flexible damper built within it. Intended to absorb stresses from the engine and transmission, they can fail prematurely, causing a metallic ‘clanking’ sound and/or vibration to be felt at certain engine speeds. It is recommended by many technicians that dual mass flywheels are replaced at every clutch change. Still, excessive clutch slip can put undue stress on the dual-mass flywheel and reduce its operating life. Good stuff - thanks for the info 1 Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted May 16, 2014 Share Posted May 16, 2014 Thanks for the very informative replies guys I've learned alot Sent from my GT-I9505 using Tapatalk Quote Link to comment Share on other sites More sharing options...
cs2000 Posted May 17, 2014 Share Posted May 17, 2014 Since their adoption by most manufacturers, primarily for their diesel models, a dual-mass flywheel (DMF) differs from the more conventional ‘solid’ type, by having a flexible damper built within it. Intended to absorb stresses from the engine and transmission, they can fail prematurely, causing a metallic ‘clanking’ sound and/or vibration to be felt at certain engine speeds. It is recommended by many technicians that dual mass flywheels are replaced at every clutch change. Still, excessive clutch slip can put undue stress on the dual-mass flywheel and reduce its operating life. Good stuff - thanks for the info Agreed, I've just started getting engine vibration at around 3000rpm when the revs are coming down, I was already suspecting the flywheel was dead so I now suspect it even more Quote Link to comment Share on other sites More sharing options...
Nick350z Posted May 18, 2014 Share Posted May 18, 2014 I had mine changed this year and made a thread about the DMF failing which you may find helpful - http://www.350z-uk.com/topic/82312-symptoms-of-a-failed-dual-mass-flywheel/page__hl__symptoms Quote Link to comment Share on other sites More sharing options...
Dicky Posted May 18, 2014 Author Share Posted May 18, 2014 That's worth knowing, thanks Quote Link to comment Share on other sites More sharing options...
Stutopia Posted May 18, 2014 Share Posted May 18, 2014 Whilst we're on about flywheels, is the idle chatter on the SMF appreciably louder than the DMF? I know mine is on the way out so I'm curious as to how noticeable it is. A chatter when I'm sat at the lights is the sort of thing that might drive me nuts Quote Link to comment Share on other sites More sharing options...
Dave McCool Posted May 18, 2014 Share Posted May 18, 2014 As far as I know a lot of the noises that mine makes are to do with the SMF which was fitted by the previous owner. Some days it's not so bad, other days it really is serious and is about the only thing that spoils the car for me - it's not so bad at idle, just the usual clackety sounds with the clutch engaged, more while under any kind of load below around 1,600rpm. It's mostly drive-roundable, but irritating when I'm pulling into the work car park and all the people at work think my nice new car is very poorly... http://youtu.be/pyuIL4FlVT4 This gives a good idea of the noise, if not the volume at times - I took a mate out in it the other night because he didn't believe how agricultural the noises that came from the car could be - gave it a bit of a boot at 30mph in 5th and he was amazed. When you get that reaction from someone who's daily drive is a 25 year old Land Rover 90 (a pickup at that) you know it's loud! Quote Link to comment Share on other sites More sharing options...
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