1Z Flexrohr nach 22 Monaten defekt - wer haftet ? | Posts 32+

Hello Martin,

I have a question: Did you replace the engine mounts, specifically the transmission support?
'In my case, the flexible pipe is also damaged, but only in the lower section. You can hear the turbo whistling at idle, and between 2200 and 3000 RPM, it starts to make a booming noise!'
It's highly likely that the transmission mount is definitely defective. I once read something about 'brown sludge on the transmission mount' in a post! I was able to confirm this, although I initially suspected transmission oil ! However, after searching for a longer time, I couldn't find any leaks ! It's completely dry, and that's with 253,000 km!
Is that a hydrostatic bearing?
And then I didn't quite understand your test; you lifted the motor out of the bearing housing . But the bearing housing is bolted to the end wall!
Or am I mistaken?

Best regards, Ferdi.

Hi Ferdi,

AHF sounds like it uses an "hanging" engine mounting system, similar to what's found in a Golf 4.

In the G3, the engine is "mounted" on three fluid bearings.
At the front, on the engine carrier; at the rear, and on the transmission side, on the axle housing.
There's nothing attached to the walls!

Yes, the part related to the transmission is new. But the flexible pipe didn't start making noise until much later.

However, after the battery swap, the rattling noises that the car had always had disappeared. So, it's possible that there's a connection: the motor was causing too much movement, which damaged the FR (likely referring to a specific component), and now, only later, it's finally broken down completely.

It's incomprehensible to me that VW doesn't check the engine mounts when a car is returned after 23 months.

Now, after another 10+ months, it's probably my personal pleasure that I now have 4 FRs to install .

m;

Hi Martin,

Yes, for the AHF (automatic high-pressure fuel injection) in the Golf 4, the FR (Fahrzeug-R) version is only available with the catalytic converter, which costs about 700 euros !
I have a local workshop nearby that specializes in VW vehicles, and they can just weld in a new flex pipe for about 100 euros , which I think is reasonable!

Do you have any idea what the condition of the gearbox is like on a Golf 4?
I would like to know where the oil is coming from. Every time I change the oil, there's oil leaking from the support bearing attachment on the transmission side! I have to wipe it off each time.
Unfortunately, I can't find anything about this support here.

Best regards, Ferdi.

While the FR exhaust system with the catalytic converter is expensive to replace, the construction of the exhaust system, which supports the catalytic converter, is much better than the flimsy design on the 1Z, where everything hangs freely and is only attached to the cylinder head and behind the mid-pipe.
That would tear the FR apart.

You can always try welding it, and if it doesn't work, you can either try again or replace it.

I'm not exactly sure how the bearing is mounted on the G4. In my case, the faulty bearing could be removed by tilting the engine: Hold the intake manifold and alternator, and press firmly (alternator down, intake manifold up). Then, it would pop out of the bearing by about 1-2 cm.

m;

The AHU flex pipe isn't significantly better either; it needs to be replaced at 120,000 km and 210,000 km. (The latter replacement used a much longer flex pipe, which required some modifications, but since the turbo had just been replaced, it wasn't a problem).

The longer flexible pipe has the advantage that it bends less per unit of length, which results in less material fatigue.