VP37 Anti-vibration - the perfect solution...

Hi,

Regarding the "ruckel" (jerky/stuttering) issue on VP37 TDIs:

The contaminants found in the metering unit are usually iron shavings that originate from the dispensing pump and are so fine that they pass through the filter.
Then they are attracted by the magnet of the signal box and block its proper functioning.

Prevention: A permanent magnet is installed in the diesel fuel line before the VE pump, which attracts metal particles before they reach the pump. In the simplest case, it would be sufficient to place a cylindrical permanent magnet on the hollow screw at the pump inlet, where it would stay in place on its own.

From time to time, the hollow screw is unscrewed using a long socket wrench, the magnet is removed, and the shavings are flushed out with brake cleaner.


I would say that this is the perfect solution for the stuttering problems .

Greetings.
John.

I thought the shavings came from the EP when it wears out?
If 50 grams of iron were flushed through a tank with a capacity of 50,000 liters, do you think anything would end up in your pump? I'm not sure... If water accumulates at the bottom of the tank, wouldn't the metal also tend to settle downwards?
The solution for even finer filtration would be: Leave the diesel filter in for as long as possible.

vwSchrauber wrote:

... The contaminants in the metering unit are mostly iron shavings that originate from the dispenser pump and are so fine that they pass through the filter. ...

Unfortunately, not!
Diesel filters have "pore sizes" that prevent such contaminants from passing through.
The metal shavings come from the VP37 itself. Unfortunately, that's the case.

slightly off-topic.
"In the past, engine and transmission oil drain plugs used to have magnets, which have largely become obsolete with today's fine filters. However, I would be happy to see that missing sixth-gear tooth from my transmission on the magnet again! It wasn't in the oil."

Quote:

Unfortunately, not! Diesel filters have "pore sizes" that prevent such contaminants from passing through. The metal shavings come from the VP37 itself. Unfortunately, that's the case

.

Are you *absolutely* sure about that? We've repeatedly found metal shavings of various sizes in the fuel tanks of different TDI vehicles. Some of them were as large as 1 x 1 mm. There's no way those could have passed through the OUT screw, as it only has a 0.xx mm (I don't remember the exact size) hole.

Even in a 320 BMW, there were shavings of various sizes in the filter housing, some up to 1 x 1mm. If those shavings came from the sensitive VP44 pump, it would stop working completely .

The DiFi mesh size is in the range of 1-4 μm. Considering that the debris in the MSW usually appears only as a gray haze, this could be a viable solution. It looks similar to the gray haze that can be found on the surface magnet of a VAG automatic transmission.

Quote:

slightly off-topic. "In the past, oil drain plugs in engines and transmissions used to have magnets, which have largely become obsolete with today's fine filters, but I would be happy to see that magnet again, especially considering the missing sixth-gear tooth in my transmission! It wasn't in the oil!"

For overhauled engines, such a magnet might have its justification. Once, I used a telescopic magnet in the freshly drained and refilled oil, and afterward, it looked as if it were coated in velvet .

The gearbox still has these magnets, at least in the 01E transmission in my car. However, they are not located in the screw itself, but somewhere inside the transmission.
"Out" only has a 0.x value? But a significant amount of fluid passes through it. In the case of the VP44, that would be the overflow bore, but there's also the valve there, which, when open, provides a much larger cross-sectional area.

vwSchrauber wrote:

... The DiFi mesh size is in the range of 1-4 μm. Considering that the debris in the MSW usually appears only as a gray haze, this could be a viable solution. It looks similar to the gray haze that can be found on the surface magnet of a VAG automatic transmission. ...

Fortunately, this mucus is less harmful for VP37.
There's also a lot of non-magnetic debris mixed in. Especially the wear from the pump housing. That's because it's made of aluminum, which is known to be non-magnetic . And I've already removed quite a bit of that from the VP37 .

Okay, the magnet won't cause any damage. The question is what the Hall sensor in the pump does. That's something we need to figure out.

If you're certain that the debris is coming from the tank, although I personally don't see that as likely, you could mount the magnet on the fuel filter. In that case, the Hall sensor would definitely be shielded from it.

He actually wanted to include it in the preliminary round. That shouldn't cause any problems for the pump.

Quote:

There's also a lot of non-magnetic debris mixed in. Especially the wear from the pump housing. That's because it's made of aluminum, which is known to be non-magnetic. And I've already removed quite a bit of that from the VP37.

How does that happen? All the components under stress are made of steel, so there shouldn't be any aluminum flaking off (unless there are material defects).

Okay, the injection molding nozzle is mounted in an aluminum housing.

Quote:

Okay, a magnet won't cause any damage...

The question is what the Hall sensor of the pump does. That's something we need to figure out.

Quote:

Which one are you referring to? The MSW only has a standard inductive sensor.

Wenn man sich sicher ist, daß die Späne aus dem Tank kommen, ich selbst sehe das nun nicht so, könnte man den Magneten ja am Spritfilter montieren.

I've also thought about that, but it doesn't hold on as well to the round fuel filter housing. I haven't found the necessary motivation yet to install it permanently

Quote:

.

He actually wanted to include it in the preliminary round. That shouldn't cause any problems for the pump.}

It will be like that once we get a lathe here. Then it will become an "in-line magnet."

Hi,

Quote:

How does that happen? All the stressed parts are made of steel, so (except for material failures), no aluminum should be flaking off...

"That's incorrect. The housing (specifically, the pump housing) of the fuel injector is made of aluminum and often develops noticeable scratches and grooves with high mileage. Somewhere, that missing material must have ended up here as well..."

Best regards, Rainer.

Quote:

wrong, the housing (=pump housing) of the injection control unit is made of aluminum and often shows noticeable scratches with high mileage. Somewhere, the missing material must have ended up here as well...

Luckily, I still have one lying around that doesn't have a working fuel injector. It has 260,000 km on it. Let's see how worn out it is.

I also think it's the pump itself. Mine has been making noises for a long time - it's not getting worse, but it's also not getting better. I'm just living with it. I think it will continue like this for a while, and when it finally breaks, I'll have a replacement pump ready.

But the idea appeals to me - especially since it requires no effort and does no harm.

Sure, here's the translation:

"Hello."