BBM 3-Cylinder Engine: 44kW Power

Hi,

Does anyone recognize this engine?
When the air conditioning is turned on, the entire car shakes.
I that it is a relief valve, but unfortunately, I cannot test it.
The error memory is empty.

Is this problem comparable to that one?

I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Here's the car scan:

"Thank you very much!"

SG.

Hello,

Does the car run normally without the air conditioning?
If so, I would suspect a faulty air conditioning compressor.

Best regards, Rainer.

Hi,

Yes, without the air conditioning, the engine is much quieter, as quiet as a three-cylinder engine can be.
As soon as the air conditioning is turned on, the entire unit vibrates. The compressor produces a torque of approximately 16 Nm (measured value).
If the speed is above 1200 RPM, it runs smoothly (with the air conditioning on).
So, it always idles roughly, especially with the air conditioning on, at around 900 RPM.
The entire belt drive system also exhibits significant vibrations.

"This also happens occasionally while driving (although I haven't personally noticed it)."

Can I test the compressor in any way? For example, by removing the belt and turning it manually?

SG

Quote:

Is there a way I can meaningfully test the compressor?

Can I remove the belt and turn it manually? }
Good question.
It definitely makes sense to check it out. It could be that the pulleys are loose, the bearings are defective, or the belt tensioner is malfunctioning, etc. So, it's worth checking the entire belt drive system.

Best regards, Rainer.

Hello,

I'll probably do that. I'll also get something to check the compression.
I'll also take a look at the belt drive and the compressor.

The diagnosis of "faulty valve" came from the , but there is no test result to confirm it.
They've already checked/replaced the timing and various sensors.
Now, she wants to replace the cylinder head and the valves (1400€).


SG

P.S. I'll get back to you when I have the results.

Make sure to also check the alternator's freewheel when the belt is removed.

Hello everyone!

@T3Surfer,
I wanted to do that yesterday, but the Lima doesn't have a clutch.

I don't know why, I have no idea, does anyone here know?
I was convinced until yesterday that a clutch must always be installed.

SG.

servusssss wrote:

Hello everyone! @T3Surfer, I wanted to do that yesterday, but the Lima doesn't have a clutch. I don't know why, I have no idea, does anyone here know? I was convinced until yesterday that a clutch must always be installed. SG

Perhaps the problem is precisely that the "free-running" mechanism is defective and stuck.

The model is a Polo 9N.

Best regards, Rainer.

Hi,

Normally, a free-running clutch has a plastic cap that is not installed.
The pulley is simply screwed directly onto the shaft.

Yes, it's a 9N.

SG.

What brand is the alternator, Bosch or Valeo, and what is its amperage rating? If it's a smaller alternator, around 70 amps, which is likely given the gasoline engine and vehicle, it's unlikely to have a freewheel clutch. However, if it's a 90 amp alternator, it might have a freewheel clutch.

Hello everyone,

I had time for polo today.

The Lima (alternator) doesn't have an idle function because it only has a 70Ah capacity.
The compressor is unobtrusive and always provides the same level of resistance.
Cylinder 1 has lower compression (approximately 2/3 of the compression of cylinders 2 and 3).
It seems the head/valves are probably messed up.

I've done some more searching on Google and found quite a few things.
The catalytic converter is likely too small, which is causing the valves in the three-cylinder engines to fail due to excessive back pressure.
Allegedly, there is a set of replacement parts with the following number:

03D 198 063 for the BBM, including a new catalytic converter and cylinder head, etc.


Does anyone know if this set of exercises actually exists?
Is that correct about the too-small cat?

"Thank you very much!"

SG

P.S.: Here's the link if anyone needs it or is interested.
http://forum.polo9n.info/motor-technik/1-2-6v-un-offizielle-konstruktionfehler-und-konsequenzen-t22125-220.html

The issue with the exhaust valves on the 1.2 2V engine is well-known. They overheat and crack from the outside. They look like various mushrooms, and after a certain age, they develop cracks in the spore body.

So, do they also have that problem with the defective exhaust valves in Germany?

Our VW trainers claim that the problem is due to the poor fuel quality in Austria, and that these cases are not known in Germany.