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Volkswagen Tiguan

Volkswagen Tiguan 1
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If anyone does not know, I report: “A good brownie lives in every car service.” Otherwise, where does this effect come from, which everyone has heard about: “The effect of a car service.” Well, for example: a car suddenly began to “troit”, wither and stall. What to do? Of course, in a car service. They come, they drive them into the repair box, and the car, only seeing the ignition key, gets scared and starts up right away, the malfunction disappears somewhere. Or another: on Monday a car arrives with a malfunction, such as a throttle. The malfunction is diagnosed, found, repaired. And on Tuesday, a car arrives with exactly the same malfunction. And on Wednesday. And on Thursday.

So we had a remember, most recently we talked about the malfunction of the Lada Priora car: autodata.ru/article/all/lada_priora_ne_zavoditsya/? And as soon as we made this car, Volkswagen Tiguan entered for repair. The photo was taken after the reason was found:

Volkswagen Tiguan 2

Under the hood, of course, everything is disassembled, the “head” is removed and, please note, all technical fluids are drained neatly and on time, and not during operation.

I understand that someone doesn’t need such details, but as far as I know, the Legion-Avtodat company’s forum and website are read not only by the bison of repair and car diagnostics – novice comrades also drop by. So, I’ll say it specifically for them, although I won’t open America. But at least I’ll remind you, because sometimes I had to see: you’ll go into some kind of box, and there are a bunch of slimy sawdust and puddles of oil on the floor, either they didn’t have time to “catch a stream of oil”, or they work like this: “wipe the floor with sawdust “. Of course, this is all written in the manuals, only who reads them: “Before removing the part, check and make sure that the technical fluids are drained.” A trifle, it seems! Now imagine if the client will come to you again if he goes into the box and sees puddles of oil on the floor? Also: if you plan to reuse antifreeze, engine oil, etc., drain only into a clean container. Clean! I understand that it might seem to someone that operational thoroughness and cleanliness are not needed here, but you can believe me: “The client, yes, may not even know that he was refilled with the same antifreeze or motor oil from dirty dishes. But you will still have a feeling of “wrongness” inside. If you can live like this – live, but in our car service these details are scrupulous.

In the photo above, by the way, you can see that under the motor the pan shines. Yes, this is oil. But not ours, we merged everything through a special suction. So, “someone and once” poured motor oil into the engine like that. Spilled? Well, do not give a damn. They want here, most likely, another trouble can be traced: see the oil filter and how is it located? At an angle. So, it was removed before the engine oil was drained. They simply unscrewed it, and oil poured out (the disassembly order technology was violated). And the oil pan is okay, but the oil on the engine body is a garbage can under the hood. But if someone likes to ride like that – no question.

Now about the car itself, to make it clearer what we’ll talk about:
Volkswagen Tiguan – a compact crossover company Volkswagen, produced since 2007. Built on the Volkswagen Golf platform.
Currently, the car is produced at Volkswagen plants in Wolfsburg Germany and Kaluga Russia. The car was presented in 2007 at the Frankfurt Motor Show, in the same year at the Shanghai Motor Show, Volkswagen introduced the Tiguan HY Motion on hydrogen fuel cells..
The car is available both with front-wheel drive and all-wheel drive. Engines (installed in the Russian Federation) – 1.4 TSI (mechanical supercharger + turbocharging – 150 hp and without a mechanical supercharger with turbocharging – 122 hp), 2.0 TSI (turbocharged 170 hp and 200 hp) and 2.0 TDI (140 hp). In both cases, the Haldex coupling is responsible for connecting the rear wheels, providing all-wheel drive with a variable gear ratio.

Highlighted the motor that was under repair. To whom it is, but in our opinion, for such a heavy body, a motor of such a liter capacity, albeit with a turbocharger, is not very big. However, if the fuel is good, then the machine will run, but …

Where do we live? That’s right, we live where the trip to the gas station is always connected with the game and luck. Lucky – there will be good fuel in the tank, no luck – see the photo below:

It would seem, what does this piece of metal and gasoline have to do with it? Have not guessed yet? Then according to the client:
– I don’t know what this is connected with, but everything was fine until one moment: I was going to the gas, I was pressing it, and suddenly it rattled under the hood! Rang out! He threw off the gas, then succumbed a little – and rang again!

Judging by the emotional description, it was an ordinary detonation effect. I will not go into deep details, in short:
· Gasoline, as a fuel for internal combustion engines is used in connection with the necessary parameters of detonation resistance
· If gasoline for some reason loses this detonation resistance, then the “knock effect” occurs, in other words: “Gasoline burns in the combustion chamber instantly and with the formation of explosive shock waves”.
· One of the causes of detonation is the use of an inappropriate class of gasoline for a given type of engine (another octane rating).

Some say that “detonation is nothing to worry about, it will rattle a bit and pass, it will not bring harm to the motor for a short time.” I do not agree and will continue to cite the facts; pictured is the piston of this motor:

Volkswagen Tiguan 3

And that piece of metal that was in the previous photo, it’s just from here, everyone saw?

It seems to be what an unimportant thing “detonation” is, but what led to it? And besides, the client, apparently, didn’t immediately catch on, he drove for a while. And as a result. Well, yes, this is a new turbocharger, I had to buy it because the old one was inoperative:

When they started checking, the backlash impeller was strongly (the turbocharger shaft is broken), and the rod control (from the actuator) also had an unacceptable backlash:

And again the question: “What does the turbine have to do with it?”.

But everything is simple, and again, a reproachful glance towards the client (why did it take so long?): After the piston failed, the supplied gas in the combustion chamber did not burn, but seeped between the piston and the mirror of the cylinder into the pan, where safely mixed with engine oil. And the turbine just feeds on this oil, the turbine does not have its own separate oil tank. And the poor quality of the oil, which has lost its properties, provoked a shortened life of the turbocharger.

How did we find this fault? Unfortunately, in our work it is impossible to rely on computer diagnostics, here more and more “by inspiration of ongoing checks”.

Compressometer: who is like, but we always maintain this device in good condition, that is, we regularly check it and, if there are doubts about the accuracy of the readings, we change it. It is better to spend two rubles on a new one than to make a mistake in measurements.

Checked the compression. In the first cylinder about 4 atm. It’s clear that it’s not enough. Rechecked – the same indication. A little oil was poured into the cylinder and checked again – the pressure rose. And in the other cylinders the norm. Yes, advice: the piston is shown above in the photo. Pay attention to the notch at the top. So, if you fill in a “small spoon” of oil to check, then do not check anything – the filled oil will accumulate in the recess. So you need a little more.

What this gives: it allows you to check how tight the rings are to the cylinder walls, oil reduces the gap between the piston and the cylinder mirror. And if during the test without oil the pressure was small, and during the test with oil filling it increased, then attention should be paid to the tightness of the piston against the cylinder walls and understand what prevents the piston and piston rings from creating the required pressure.

And again: it seems to be a trifle, as just said. But how many times had to encounter the fact of incorrect measurement of compression, which led to incorrect conclusions, and then, logically, to unreasonable monetary waste. Example further: “battery”. What does he have to do with compression? And despite the fact that if the battery is weakly charged, the starter will turn the motor barely, and then it is very difficult to have accurate readings.

And if generalized, then like this (classic):
· When measuring compression (pressure in the cylinder at the end of the compression stroke), you must have:
a) Motor warmed up to operating temperature
b) Fully open throttle
c) Fully charged battery
d) Inverted spark plugs in all cylinders
e) Starter serviceability

And I would like to draw attention to another aspect that is almost never taken into account when checking compression – an air filter. Surprised? And there’s nothing to be surprised at, it’s simple physics: the engine cylinder is filled with air at the suction stroke, the air from the atmosphere necessarily passes through the air filter. And if it is clogged, then the readings will be inaccurate.

One more thing: let’s not forget that all of our compression measurements are relative. And rely not on the exact value of the compression in the cylinder, but on the difference in readings between the measurements in each cylinder.

Of course, all these are trifles. But it is precisely from such “trifles” that the work and the result.

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