Dual Flow Baffle on 1900 Diesel

[Vi0letta]

Hi Guys,

Can anyone explain what a dual flow baffle is on a diesel (hopefully you know what i mean, if i got the name wrong)?
Took my car to the garage and told me it needs replacing, so wanted to get a bit more understanding about it..

Thanks,
V

[littleredrooster]

Erm...could it be Diesel Particulate Filter perhaps?

Give us another clue...what does it relate to/how expensive was it?

[Evoluzione]

Its sounds like the main glib shaft has come undone causing some damage. You'll need a new set of hexagonal tag nuts, a gangle pin, new trumpets and a dangleberry adaptor.

You may have been lucky and got away with any damage to the pisstake valves, good luck with it.

[Vi0letta]

got the real name: Dual mass flywheel.
thanks guys

[blaineuk]

Does your car judder on setting of?

[Mr2Mike]

Vi0letta said:

got the real name: Dual mass flywheel.
thanks guys

It's a flywheel made of two separate circular bits of metal connected together by large springs. It sits between the engine and the clutch, and it's purpose is to smooth out the turning force (torque) produced by the engine, which on a modern diesel tends to be delivered in lots of short pulses rather than continuously. Without it, the gearbox can be put under a lot of stress and it makes the whole drivetrain more noisy. Unfortunately they are prone to failure at higher mileages, causing rattling and clonking noises, especially when starting or stopping the engine, or driving at very low RPM with lots of throttle.

This video shows an animation of the construction and operation of the dual mass flywheel.

[Locknut]

All engines have a flywheel and they are (or were) a large round piece of solid metal. A dual-mass flywheel is located in the same place and does the same job, but instead of being a single solid piece of metal it is in two concentric pieces connected by long springs. (The construction is more complex but I'm struggling to explain.)

The purpose is to cushion the engine pulses so as to save wear on the transmission and make the engine feel smoother to drive. This has become necessary because of the high output modern turbo-diesels.

Unfortunately they are often less reliable than a solid flywheel and are expensive to replace. There are solid flywheel conversions available for many models and this leads to more debate. It is argued by some that a solid flywheel conversion will lead to more shock loading on the transmission and bigger bills in the long run. However there are many solid conversions that have given complete satisfaction to their owners. It seems some car models are more suitable for conversion than others.


Edit:Mr2Mike posted while I was typing, hope my post is not too much of a duplication.

Edited by Locknut on Tuesday 23 April 23:43

[Vi0letta]

blaineuk said:

Does your car judder on setting of?

no it does not rattle, but I took it to a couple of garages and all they did was pressed the clutch a couple of times and told me the fault. Is it so easy to determine dual mass fly fault?

[Vi0letta]

Thanks guys. this is helpful.
Have now been driving with it for over 2 months since i have noticed the rattling noise. and now the rattling noise is sometimes present and really loud and sometimes isn't there at all.
My clutch however, did begin to vibrate just before the biting point on one trip but again this is no longer present.
Plus I now recall having some clonking noises when going over speed bumps or potholes and sometimes even when turning. SO took it for a check up and after lifting the car up to see if anything got loose the noise was gone, so they came to a conclusion it may have had something that got caught inside and fell out when the wheels were hanging loosely.
Do you think the two could be related?

[littleredrooster]

Ph scrambled a reply to another thread. Sorry, but not my fault. Ignore.

Edited by littleredrooster on Saturday 26th October 18:40