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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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1997 M90 Clutch decisionViews : 2746 Replies : 39Users Viewing This Thread : |
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Nov 10th, 2019, 17:18 | #11 |
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diesel
Get a dogdish flywheel and buy a hd sachs diesel clutch off ebay for £116.
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Nov 10th, 2019, 17:20 | #12 |
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All petrol 940's with the M90 gearbox had a DMF so you will have the 240mm DMF clutch
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Nov 11th, 2019, 15:12 | #13 |
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Can somebody explain to me please? Is the DMF separate to the clutch. Can I just renew the clutch without renewing the DMF? I don't have any of the symptoms of a failing DMF.
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Nov 11th, 2019, 15:28 | #14 |
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yes of course , a petrol engine is kind to the Dual Mass Flywheel , no huge pressure pulses from the diesel crankshaft to deal with .. It is a piece of cake to get the gearbox out and replace it anyway unlike today's Front wheel drive cars ..
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Nov 11th, 2019, 15:32 | #15 | |
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Quote:
how ever much the caravan weighs, or steep the hill The engine can never produce more torque than it was designed for can it , If the clutch slips when towing or not it is worn or faulty and needs replacing ...
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Nov 11th, 2019, 15:42 | #16 | |
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Quote:
Referring to my picture further up about the clutch, the flywheel is in very simple terms in two vertical halves. In other words, instead of one thick disc, it's two thinner discs and the one closest to the clutch disc is joined to the one on the back of the engine by an arrangement of springs. This gives you two flywheels or dual flywheels and i think the "Mass" part of Dual Mass Flywheel came about as it sounded better! The arrangement of springs creates a suspension type effect but in a rotary motion rather than up/down as with your normal springs and shock absorbers This reduces vibration and increases the power and torque handling of clutch. Because of the spring arrangement inside the DMF, they become a wearing item with the rest of the clutch. That's why many garages replace the DMF with the clutch as a complete assembly so if there's any come-back, the parts are guaranteed. Many garages view them as a "black art" because they don't fully understand them (can't say i blame them really! ) so that's probably why your local "trusted garage" has said they'll do it if it's a normal clutch but not if it's a DMF so you might be better off going to Volvo and asking for a firm price and description of what clutch you have and/or are likely to need. Hope that makes some sort of sense!
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Nov 11th, 2019, 19:42 | #17 | |
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Quote:
Hi Dave I spoke with them today and the garage said they would only replace the clutch and not the DMF if that is what I want and the DMF doesn't need replacing but they are quite happy to renew both.
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[IMG]Volvo2 by Strider'swoman, on Flickr[/IMG] Current '96 945 2.3 lpt - Aurigas, tailgate spoiler, sports grille, lpg fuelled Previous '88 764 TD, '92 945 TD, '88 745, '81 244 DL |
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Nov 11th, 2019, 20:01 | #18 | |
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Quote:
DMF is Dual Mass flywheel. Just like with a normal flywheel the clutch bolts to the flywheel as normal. What does change is the springs that would normally be in the friction plate are moved into the flywheel. You can use them more than once but with many cars there is so much labour involved its not worth taking the chance. The 940 is a very quick clutch to change so unless its making any noises you should be fine to reuse it |
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Nov 12th, 2019, 02:26 | #19 |
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The 940 DMFs are fairly reliable in my experience. I've abused mine and no significant issues. It not like VW ones that don't last well atall.
A clutch (and/or DMF) change mainly need the driveshaft disconnected and gearbox out, which isn't a big task with a proper lift. I did it myself with axle stands and trolley jack. Still a soft pedal confuses me. The pedal force will be linked to the cover plate springs, hyraulics and friction in the system. You tend to find the friction builds up especially the ball pin plastic cover wears away. There is no really difference hear with a DMF. The spings Dia mentions is just the slack take up dampers, not the clamping springs. Is there any lift in the pedal? can you lift it higher with your foot? Everything is plastic and you can loose clutch travel as it wears slots in the pedal and drive boss in the mater cyl. |
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Nov 12th, 2019, 05:53 | #20 |
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Does the 940 actually have a proper DMF. As I recall when I changed the clutch on our first 940 it was not the modern make up of springs and gubbins, which are a right pain. The flywheel was just made up of an inner and outer bonded together with rubber as the damping medium.
For what its worth, over the years I fount the weakest point of the system was the operating fork that tended to wear through on the ball stud which meant a gearbox out to replace. |
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