Starter motor: Noise after engine start

Hi!

No, it doesn't sound like gears grinding against each other. More like a dry bearing in an electric motor. I've now lubricated everything I could reach. The helical gear, the planetary gears, and the bearings of the electric motor. The starter turns perfectly, and the motor starts well. If the starter motor then runs without a load, you will hear the noise described above again.

The starter motor has the VW part number 02A911023R. Unfortunately, the Bosch part number has deteriorated and is no longer legible.

Regards,
mcgregg

Hi.

I think I know which noise you're talking about. I've only seen this on very old VWs, or is that actually your Skoda?

I suspect that the starter motor, if it's already loose and leaking, has so much play that the shaft can swing.

I would: remove the starter motor, verschandeln it, grease it, reinstall it, and hope for the best... otherwise, you might need a new one if it bothers you too much.

m;

dieselmartin wrote:

I think I know which noise you're talking about. I only know it from very old VWs, or is that actually your Skoda???

That's it. 3.5 years old, 127,000 km driven. I was kind of expecting more.

dieselmartin wrote:

I would: remove the starter, verschandeln it, grease it, reinstall it, and hope for the best... otherwise, probably a new one if it bothers you too much.

I already did that. Now, there's a planetary gear set installed between the electric motor and the starter pinion to reduce the speed. However, I unfortunately can't access the bearing for the pinion. Perhaps the error lies there.

I had meanwhile visited the Bosch website. The starter motor has the part number 0 860 016 980 (or 0 001 125 042). This part is used in several VW engines. A repair manual would be helpful. To defy the throwaway society a little.

Regards,
mcgregg

Hi.

I wanted to take a look at it, but that stupid ecat isn't capable of doing so.

- I can't find anything using that Bosch number.
- with the VW number already - but only for the Ford Galaxy.
- Image cannot be loaded.
- That thing is as slow as a punch card.



And the planetary gear system is "lubricated" with grease?

Is that possible?

m;

P.S.: Is it still the same as with the G2, where the engine sags if you remove the starter motor?
Is it different with automatic transmissions?

dieselmartin wrote:

And the planetary gear system in bold "endured" ???

Is that okay? [/quote]

Unfortunately, no, it's encapsulated. Maybe I'll try using an oil injector sometime. Sadly, the results aren't as long-lasting as they are with fat. If I even manage to hit the right spot.

dieselmartin wrote:

P.S.: Is it still the same as with the G2, where the engine sags if you remove the starter motor? Or is it different with the automatic transmission?

The engine stays where it is. However, there is still one issue: the hex heads of the fastening screws are 18mm in size.

I don't know how it works with automatic transmissions.

Regards,
mcgregg

I have since learned that the starter motor, despite the engagement mechanism, has a freewheeling clutch. My explanation: The starter motor rotates the engine at approximately 300 RPM during startup. If the engine starts, it quickly reaches its idle speed, which is about 900 RPM. The freewheeling clutch prevents the starter motor from being dragged along. The starter pinion gear, with its corresponding gear ratio, accelerates until it disengages when the ignition key is released, or until the idle speed is reached. This creates a speed difference between the pinion gear and the output shaft of the planetary gear, which is then equalized after disengagement via the freewheeling clutch, which is now rotating in its "through" direction. If it dries out, it will produce the unpleasant noise described above.

The theory is contradicted by the fact that, after the engine starts, the unloaded starter motor would also spin up to a high speed. However, I suspect that the starter motor is designed such that its rated speed (during starting) and its maximum speed (starter motor without load) are relatively close together. The diesel engine would cause the electric motor to spin "infinitely" via the clutch bell/gear ratio and the planetary gear. The old starter motor without a planetary gear was not affected by this. But why was the planetary gear installed if a freewheel is also necessary? It is likely that the starter motor operates more efficiently at high speeds, which means that, for the same power output, it can be smaller and lighter.

I will soon, when the weather is nice, specifically address the oil leak, and for now, I'll consider the noise as a "cosmetic issue."

Regards,
mcgregg

Hello,

I also know that sound from my Passat 35i!

Everything seems great, the engine starts up and runs smoothly!

Replaced the planetary gear set, no improvement. Replaced the freewheel, still no improvement.
Oiled it, but it didn't help. Engine sprocket also in good condition!
I even installed a new (used) starter motor, but it still makes the same noise.
I think the starter motor pinion bearing in the transmission (or engine? ) has too much play.


Then I had an accident that resulted in a total loss. That then achieved something.
The starter motor on the new car isn't making any noise anymore...

Best regards, Manuel.

Hello!
I completely agree with my previous speaker! I had the same problem with my old Jetta. As long as the starter pinion and, consequently, the shaft were still rotating (due to the engine's momentum), I heard that awful noise (I even thought it sounded like Märklin *g*). The cause was a copper (or similar) bushing in the transmission that housed the starter (if I remember correctly – it was a long time ago!). Anyway, I replaced it when I changed the clutch, and that was the end of the problem. Back then, you could also see a crack in the copper.
It's just a cheap item, but the assembly is quite complicated...

Best regards,
Sure, here is the translation of the text from German to English:

"Dirk"