p38 duelmass flywheel

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the hooded claw said:
Tek it out get it WELDED TOGETHER (same as we used to do with Ford Transits!!)

Refit ..PROBLEM GONE !!!!!

Gemme 1/2 hr I'll find the DEFINATIVE Link fer ya on the Transit site....
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Look and you will see that crankshaft failure is a problem on the Tddi and the Tdci Transit engines when the DMF is replaced with a solid flywheel. The problem is likely to be worse on a long 6 cylinder crank. The DMF is a torsional vibration damper.
 
Datatek said:
Look and you will see that crankshaft failure is a problem on the Tddi and the Tdci Transit engines when the DMF is replaced with a solid flywheel. The problem is likely to be worse on a long 6 cylinder crank. The DMF is a torsional vibration damper.
Click to expand...

Yeah and it's about time manufactures reverted to solid flywheels with the damper on the front of the engine where it belongs. Instead of these DMF money pits. The DMF is designed to smoot out the transmission at low RPM and low speed in high gears. Supposedly giving better fuel ecomomy. They are a bloody abortion and should be discontinued.
 
wammers said:
Yeah and it's about time manufactures reverted to solid flywheels with the damper on the front of the engine where it belongs. Instead of these DMF money pits. The DMF is designed to smoot out the transmission at low RPM and low speed in high gears. Supposedly giving better fuel ecomomy. They are a bloody abortion and should be discontinued.
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Or made properly to last the life of the engine:mad:
 
Datatek said:
Or made properly to last the life of the engine:mad:
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I do not think that is possible, i think they are just a lifed item gimic. A strong crank and solid flywheel and being in to correct gear has worked great for a long time, why change it to a short life micky mouse idea.:)
 
wammers said:
I do not think that is possible, i think they are just a lifed item gimic. A strong crank and solid flywheel and being in to correct gear has worked great for a long time, why change it to a short life micky mouse idea.:)
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With the DMF it's possible to build lighter cranks = cheaper, but also helps economy so they say. Certainly makes for a smoother feeling engine, personally I don't have a problem with them, I prefer Auto for daily use:D
 
Datatek said:
With the DMF it's possible to build lighter cranks = cheaper, but also helps economy so they say. Certainly makes for a smoother feeling engine, personally I don't have a problem with them, I prefer Auto for daily use:D
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That is what it's for ecomomy, as i said earlier lower revs, higher gear in low speed traffic to smooth the transmission. At high speed they do nothing. When you consider that all diesel at least, Range Rovers have crap fuel economy around town in slow traffic and only produce good figures above 50 mph, on those it's not a lot of use. I would have thought if they wanted to reduce cost it would take far less than the extra cost of a DMF to strengthen the crank. Unless they are buying them for peanuts which is possibly the case. Anyway what he asked about has something to do with crankshafts at ten paces then turn and throw surely.:D:D
 
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DMF's are only doing there job at idle, as soon as any load either driven or on over run is applied they go to there stop and transmit the drive.

As for crankshaft failure with solid fly wheel conversions ive never come across this myself and have fitted loads to transits and other vehicles. One of my jobs (yes i have 2) we remove DMF's and fit solid because the dmf's fail due to the high torque loads we subject them to (on dyno's) and we have never had a crank shaft failure do to it.

If you fit a solid fly wheel replacment you must fit the replacment clutch to go with it as it has the springs in the centre plate and the DMF clutch has a solid centre plate, so welding a DMF up and fitting a DMF solid clutch will give you harsh clutch bite and will transmit all the vibration through the drive train/crank shaft.
 
oldskool said:
DMF's are only doing there job at idle, as soon as any load either driven or on over run is applied they go to there stop and transmit the drive.

As for crankshaft failure with solid fly wheel conversions ive never come across this myself and have fitted loads to transits and other vehicles. One of my jobs (yes i have 2) we remove DMF's and fit solid because the dmf's fail due to the high torque loads we subject them to (on dyno's) and we have never had a crank shaft failure do to it.

If you fit a solid fly wheel replacment you must fit the replacment clutch to go with it as it has the springs in the centre plate and the DMF clutch has a solid centre plate, so welding a DMF up and fitting a DMF solid clutch will give you harsh clutch bite and will transmit all the vibration through the drive train/crank shaft.
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That sounds about right. Although according to the bumf they are there to smooth out tramsmission at low road speeds in high gears. And yes the springs in the spinner have worked for years doing that with little problems. The DMF is the work of the devil in my view. A totally useless gimic.
 
oldskool said:
DMF's are only doing there job at idle, as soon as any load either driven or on over run is applied they go to there stop and transmit the drive.

As for crankshaft failure with solid fly wheel conversions ive never come across this myself and have fitted loads to transits and other vehicles. One of my jobs (yes i have 2) we remove DMF's and fit solid because the dmf's fail due to the high torque loads we subject them to (on dyno's) and we have never had a crank shaft failure do to it.

If you fit a solid fly wheel replacment you must fit the replacment clutch to go with it as it has the springs in the centre plate and the DMF clutch has a solid centre plate, so welding a DMF up and fitting a DMF solid clutch will give you harsh clutch bite and will transmit all the vibration through the drive train/crank shaft.
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LIKE IT oldskool ..Crackin bit of VERY USEFUL info there mate ....Cheers
 
wammers said:
That sounds about right. Although according to the bumf they are there to smooth out tramsmission at low road speeds in high gears. And yes the springs in the spinner have worked for years doing that with little problems. The DMF is the work of the devil in my view. A totally useless gimic.
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Can't see how TBH cos as long as there load on it it will be on its stops, much the same as a normal clutch centre plate works springs compressed under load.
 
Datatek said:
Look and you will see that crankshaft failure is a problem on the Tddi and the Tdci Transit engines when the DMF is replaced with a solid flywheel. The problem is likely to be worse on a long 6 cylinder crank. The DMF is a torsional vibration damper.
Click to expand...

We just replaced a dmf with solid on our works Nissan Navara, having got through three in 60000 mile (due to lots of caravan towing as i work for Chichester Caravans). If any thing I would say the truck is much smoother to drive than it was with the dmf (and hopefully will last a bit longer!)

Up until a few years ago we all managed quite happily (reguardless of what we drove) without dmf,s. Not the best idea and generally seem under engineered for the job, especially on heavy or torquy cars. :)
 
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