Serpentine belt is worn out

Hi,

Please provide the text you would like me to translate from German to English. I need the text to be able to translate it.

Engine AFN, without air conditioning, without power steering.
Belt drive with automatic tensioner and generator freewheel.

After the old belt was making a terrible squealing noise, I recently replaced it.
It worked fine for a while, until yesterday morning (-15°C). As soon as the engine started, the belt immediately came off (the charging system didn't work at all).
Yesterday afternoon, I tried the trick three more times. When the starter motor spins, the belt stays on, but as soon as the engine starts, it comes off.

I then put on the old, stiff squeegee blade - and it works.
The new belt isn't some cheap eBay garbage; it's a Conti belt.

Does anyone have an explanation for that?

Regards,
dieter

Hi,

Belts too long?
Does the tensioner still have enough clearance to adjust for the new belt?

The belt length is the same.
The belt drive, as it is and with this type of belt, has functioned perfectly for tens of thousands of kilometers. Even the belt manufacturer was always the same (Conti).

P.S.: The only good thing about it is that I finally have a really good tool for the belt tensioner. There's nothing quite like having a welder and a small supply of materials at home.

Have you ever checked if your dog's off-leash area is actually safe and suitable for them? If it is fixed, the tensioner will vibrate much more noticeably.

A larger adjustable wrench is also a very suitable tool for the job.

Quote:

Yesterday afternoon, I played that game three more times. When the starter motor spins, the belt stays on, but as soon as the engine starts, it comes off. I then put on the old, hard squeegee blade - it works.

A suspended tension element could be considered. The new belt, due to its increased grip, could temporarily deflect the tensioning element further, and if this element then momentarily gets stuck, the belt is momentarily without tension, so that...

I will examine the free-running feature more closely.
I'm not experiencing any strong vibrations, though. However, I've also driven for a year without a FL (flexible loan), and nothing like that happened then either.

I'll take a closer look at the tensioning element this weekend, but I couldn't detect any excessive friction when I repeatedly put the belt on.

By the way, I don't find it very easy to put the belt on using any kind of pliers, because the motor is located in the T3, and everything is a bit different there. Now I can operate the tensioning lever through the service panel using a ratchet, and it's really quick.

Regards,
dieter

Hi,
You're saying that without a servo, meaning the KRR directly drives the water pump and the generator?
hg
Herbert.

Hi,
You're saying that without a servo, meaning the KRR directly drives the water pump and the generator?
hg
Herbert

That is already original as it is. On a Volkswagen Golf 3 AFN, there is a separate serpentine belt that runs through the power steering system.
I had a problem with my AFN where the belt also came loose.
He just got tangled up in the KW wheel around me. The belt was also relatively new. The previous owner had it replaced by VW, including the alternator.
Now I had replaced the belt, and after a week, it looked like it was being scraped from the top again. Shortly after, he was gone again.
Okay, so I got a new belt again, but this time a shorter one. It looked strangely worn from the top after a week, but it actually held up very well.
The cause of all this is actually the belt tensioner, if it only applies tension and no longer dampens vibrations.
After I replaced the part with another one from a junkyard ADY, the belt started running perfectly again.

Sure, here's the translation:

'MFG' is an abbreviation for 'Mit freundlichen Grüßen,' which translates to 'Sincerely' or 'Best regards' in English.

Quote:

AFN engine without air conditioning, power steering. Belt drive with automatic tensioner and generator freewheel.

If I'm not mistaken, the AFN (Armed Forces Network) didn't exist during the T3 era.

According to that, it must be a renovation. If that is the case, there are at least two different types of belt drive systems.

AFN engine without air conditioning, power steering.
Belt drive with automatic tensioner and generator freewheel.


If I'm not mistaken, the AFN (Armed Forces Network) didn't exist during the T3 era.

According to that, it must be a renovation. If that is the case, there are, as is well known, at least 2 variants of the belt drive.

I would assume that he left the timing belt system as it was in the Golf 3 .
The belt then only runs over the idler pulley, crankshaft, water pump, and alternator.

Hi,

to put an end to the speculation

The belt runs over the crankshaft, tensioner, alternator, and water pump.
Converted according to Volkswagen's specifications (industrial engines) using original parts.
The Golf actually had air conditioning and power steering.

And yes, of course, this is a conversion; originally, the bus had a JX engine.
I carried out the renovation in 2000, and since then, everything has been running smoothly without any problems specific to the renovation.

If it's not too cold or snowing, I'll take another look at it this weekend. Hopefully, I'll have someone who can help me start it up, and maybe then I'll figure out what's going on.

If anyone has any other ideas...

Regards,
dieter

Hi Dieter,
Let's consider the following possibilities:
- The pulleys were not aligned (e.g., due to a modified water pump drive).
- Pulley is misaligned (e.g., due to a modification).
- The pulley is wobbling.
In all cases, the belt runs at an angle. The old belt may have such worn-out rib sections that nothing happens except squeaking. The new belt has full grip on the ribs and, as soon as there is significant tension, it is pushed upwards against the flanks and pulls sideways.

@ weberli: What is a belt tension damper?

hg
Herbert.

We didn't have a case before where one of the pulleys failed due to... Bearing defect, running at an angle?
It even had a picture search function, if I recall correctly.

@ weberli: What is a belt tension damper?


A spring element that is also damped (has inertia) to prevent the belt from 'fluttering.'

Okay, gib mir den deutschen Text, den du übersetzt haben möchtest.
Audi A6 C4 2.5 TDI.
[img][/img]
Outer shell, inner gas pressure damper.

Oil pressure dampers with spring preload:
(Passat 3B, 3BG... 1.9 TDI, VW LT 2.5 TDI, T4 Bus, etc.)
[img][/img]

Golf 3 GTI, TDI, etc.
[img][/img]http://www.autoteile-meile.net/TecDocImages/0101/1000/18/53/67/G_100018536701.JPG{MARKER}http://www.autoteile-flink.de/images/product_images/original_images/1313767000_1222951.jpg{MARKER}http://www.autoverwertung-wieben.de/Wieben/artikel/bilder/shop/vierol/V10-0748.jpg{MARKER}

Hi,
Okay, hier ist die Übersetzung:

"This is about a Golf AFN." He used the same "standard" spring mechanism as he did with the 1Z.
The A4 AFN and Passat AFN also have a spacer element.
Later engines were the ones that incorporated the spring/damper combination.
The part in the third picture is also a spring element; you can even see the ends of the coil spring.
hg
Herbert.

Quote:

The belt runs over the crankshaft, tensioner, alternator, and water pump. Everything has been converted according to VW's specifications (industrial engines) using original parts.

Why industrial engines?

That's the normal KRR (Knock Return Rate) behavior of a G3 TDI engine without air conditioning.
The servo on my MJ 96 1Z was connected using a separate V-belt.

m;