Does My Auomatic Have A Dual Mass Flywheel?

[DWHail]

Hi all, my first post so please be gentle!

I have a cherished 2000 Passat saloon with 96k on it. Its a 1.9 TDi Sport 115 BHP with a tiptronic 5 speed automatic gearbox.

Here is the problem:

I have a vibration at about 1200-1500 rpm. Not severe but seems to be developing over about past 6 months.

I have replaced the timing belt and water pump as it was almost due and the vibration is unchanged.

I have run the car without either serpentine or air con belts and still vibration is unchanged.

Mot'd last week and guy said it could be the dual mass flywheel.

My question is do automatics have DMF's? I thought a torque converter replaced the flywheel/clutch assembly.

How can I tell without taking the gearbox off?

Any comments would be appreciated.

[mjh64]

Check this topic out http://www.pistonheads.com/gassing/topic.asp?t=117...

Twin Mass is only for manuals.

[Dr G]

You are correct, no flywheel on that.

[DWHail]

Thanks for the info gents.

That's better than spending Saturday morning taking the gearbox off just to discover I've wasted my time.

That still leaves me with the vibration but at least I can now be assured a disintegrating flywheel isn't going to shoot bits through the bell housing.

Any suggestions on the vibration would be appreciated.

Does the engine mounting in the proximity of the turbo merit replacement? I can't think of anything else.

Thanks again.

[shtu]

DWHail said:

Does the engine mounting in the proximity of the turbo merit replacement?

Worth taking a close look at all the mounts for any signs of problems. Start with the front "snub" mount.

[Tame Technician]

DWHail said:

Hi all, my first post so please be gentle!

My question is do automatics have DMF's? I thought a torque converter replaced the flywheel/clutch assembly.

As above your tip-tronic 5 speed will have a torque converter and as sush no flywheel.

But just to give a little clarification for every one out there with an auto VAG car.

DSG / S-tronic and Multi-tronic box's do have a flywheel.

Although different to that used by the manuals, it is there and can cause noises in the same way they can on the manuals.

[DWHail]

Thank you for the clarification Tame Technician.

Posts and items I read were saying auto's have flywheels whilst just
making mention that early auto's don't have a flywheel. That is why I asked "Does my automatic have a flywheel?" I still haven't found any specifics as what does and what doesn't.

I am quite relieved it hasn't really and that the vibration is most likely an engine mounting. I will have a closer look this afternoon.

Thanks for your input

[Dr G]

Tame Technician said:

DSG / S-tronic and Multi-tronic box's do have a flywheel.

Had a rattly multitronic one just a few weeks ago. First I'd seen.

[Adrian E]

In effect the torque converter on a proper auto does the same job as the flywheel, which is basically to dampen vibration and give enough inertia to the motor to keep it running at idle (back in the days of carbs if you lightened your flywheel to improve pick up, you'd end up with a lumpy idle as well!)

[Rich_W]

DWHail said:

Any suggestions on the vibration would be appreciated.

I'm going to suggest it's the big pulley on the front of the engine. The one with 6 6mm hex bolts holding it on. If you can get someone to remove it and re-test.

[DWHail]

Thanks for the suggestion Rich.
The anti vibration pulley I think its called.

I have taken both belts off, serpentine and air con, and run the car briefly without them and it seemed to make no difference. It did cross my mind that if it was faulty would that account for the damage to the serpentine belt tensioner. The nylon bush on the top end of the dampener arm was completely shot.

A previous post suggested starting checking the mountings with the snub mount at the front. Does anyone know the sequence for that? I remember reading it somewhere but can't find it now.

[cptsideways]

Is the vibration load dependent?


I have seen similar where it was a carbon'ed up injector tip most probably caused by crud from the egr system

[DWHail]

The vibration is slight at 850 rpm, ticking over, and the rev counter is very steady, no 'hunting'. As I pull away the vibration becomes more noticeable at between 1200 - 1500 rpm. above that the engine is as smooth as ever.
The engine starts from cold or hot on first pull and I am getting around 50 mpg so I don't suspect an injector but I am no expert on these things.

[DWHail]

Could someone help me out identifying a part please?
I slackened the three m10s holding the engine side of the front snub mount and went through drive and reverse several times then turned off the engine and tightened the bolts.
The rubber unit is loose and is able to be turned quite easily.
Is this correct? I have looked around and cannot identify the part.

Reg is W271 RVM it is a 1.9 TDi 115bhp Sport with tiptronic auto, year 2000 Engine code is ATJ gearbox is AG5
Any help would be appreciated.