Diagnosis please

[scooters]

Ok transmission especially DMF is an area I need some advice in.

 

Symptoms. ..

Volvo 940 with an M90 gearbox and a dual mass fly wheel. High pressure turbo plus sport edition. 280k mostly high speed motorway miles spent bullying A4 exec mobiles. ..

 

Clutch starts to slip at high speeds when acceleration applied. This gets worse quickly..In under 100 miles clutch slipping a lot.

 

Suddenly all transmission gone car rolls to halt. I can rev engine and change gear clutch pedal has spring but no power going to wheels...

visible drive shafts seem ok and prop shaft seems ok.

 

Have yet to have a good delve. ..

Any ideas?

Dreaded M90 DMF?

Gearbox borked?

 

Or could it be a clutch issue. I can't find a record of a new clutch in the extensive history.

 

I'm in 2 minds about starting thus because...1 if it is the gear box changing it is beyond my strength just now and it won't be cheap...2nd hand M90 are over 700 quid. DMF is similar

 

Any toughts?

 

 

Sent from my SM-N9005 using Tapatalk

[sutty2006]

Clutch Friction material has failed. Are these concentric slave cylinder? If so, check for fluid leak. If Fluid ok, then the clutch is nackered

[scooters]

Thanks ...

 

Sent from my SM-N9005 using Tapatalk

[jonathan_dyane]

A DMF failure mode would be play and noise but not complete lack of drive developing in a progressive manner as you describe.

 

+1 for clutch failure.

[supermellowman]

And another vote for clutch.

 

When my DMF went, admittedly on one of those exec Audis you bully on the motorway  , it was preceded by months of hesitation and judder within a certain rev range. I never actually lost drive, the juddering just got increasingly bad and right across the rev range in all gears to the point where the car was unbearable to drive rather than undriveable.

[Junkman]

Repair bill will exceed the cost of buying a 240 including an epic collection thread plus a trouble-free two weeks holiday with it in Southern France.

[Bren]

Sounds like you have run out of friction material.

[New POD]

The problem with the slipping clutch is that it generates heat and destroys the DMF if not careful. You'll probably be lucky.

[twosmoke300]

It's buggerino'd

[Pillock]

Bollocks. Supermellowman has just described what I hoped would be an injector, egr, sensor, turbo or pretty much anything covered by warranty. DMFs are the big expensive bit that isn't.

[Heidel_Kakao]

Over £700 for a new M90? You can get a whole 940 for less than that! I had better change the oil in my one as a preventative measure if they cost that much to replace.

[Lacquer Peel]

There's some info here about switching to a solid flywheel http://forums.turbobricks.com/showthread.php?t=94325

[scooters]

Thanks LP

It seems to be the way to go. It involves concocting transmission by using a solid 56 hole fly wheel from the earlier car mated to some bits and bobs of other clutch assemblies from other models.

I'll need to do some thinking here. Ideally I'd like to preserve the vehicle but if it gets too costly then over the bridge with it!

 

Sent from my SM-N9005 using Tapatalk

[wuvvum]

Well this has been an education for me - I had no idea that any 940s used DMFs.

[Heidel_Kakao]

Neither did I to be honest. Slightly worrying when you hear all those tales of woe regarding DMF failures but hopefully they did a proper job on the 940.

[Lacquer Peel]

Considering scooters' 940 is a powerful model with 280k on the clock, possibly on its original clutch and flywheel, it's done well.

 

I think the Ford Scorpio was another early adopter to dual mass flywheels.