Until it comes to trial, it’s worth inviting an independent expert who can assess the quality of the fuel. Who invites, he pays. It is no secret that many facts have a very different interpretation, and therefore it is better if you invite an expert. It is important that the specialist has a certificate confirming his competence, otherwise the court (if the case reaches the court) will not consider the conclusion.
METHOD OF SAMPLES
Fuel sampling has its own subtleties. The first - do not tighten. Over time, the fuel in the tank will not get better. Previously, according to GOST 2084–77, the warranty period for the storage of gasoline was five years, and this figure has disappeared from the current regulatory documents.
Downed to metal soot clearly says: before disassembling the motor, detonation rattled in it
Downed to metal soot clearly says: before disassembling the motor, detonation rattled in it! Downed to metal soot clearly says: before disassembling the motor, detonation rattled in it!
A sample is taken from the vehicle’s tank (the option is from the fuel line using a fuel pump) in the presence of the owner, service station representative and the above expert. There should be three samples: one for the owner, the second for storage at the service station, and the third for research (it is taken by an expert). The volume of each is not less than 1 liter; It is advisable to take samples in a dark glass container. A dry and clean glass wine bottle will do, but the lab will be reluctant to accept the Pepsi-Cola plastic bubble. All samples must be sealed and signed by the participants in the procedure, the fact of selection is confirmed by a tripartite act. If you don’t like something, please give a dissenting opinion.
In the conclusion with the results there should be a reference to the laboratory certificate number and its validity period - this is very important for the court. Such laboratories are not on every corner, but this is the task of the expert.
There was also a detonation, but after that the engine worked for a while on normal gasoline
There was also a detonation, but after that the engine worked for a while on normal gasoline. There was also a detonation, but after that the engine worked for a while on normal gasoline.
Now gasoline samples are checked mainly for compliance with the requirements of the Technical Regulations. Ask to additionally determine the octane number of gasoline, which is not regulated by the mentioned document. It will be needed to prove: there was fuel in the tank, which according to this parameter meets the requirements of the car manufacturer. Save the payment document: in case of your victory, this money can be returned.
VARIATIONS ON THE TOPIC
Option one: gasoline is recognized as conditional. This greatly simplifies the matter and most often allows to resolve the issue in favor of the victim without judicial trials.
The second option: in the fuel sample, deviations from the requirements of the Technical Regulations were found, or the octane number was lower than what the car manufacturer requires. The service station has a serious argument for refusing warranty repair. Further depends on the quality of the fuel and the skill of the expert. You can try to prove that engine damage is not caused at all by bad gasoline. This immediately breaks the causal link between the fact of the detection of an incorrect fuel in the tank and a motor defect. But for this the latter will need to be disassembled. By the way, the autopsy of the motor may also require service stations even with the first scenario. The argument is simple: they say, now everything is in order in the tank, but what was splashing there a week ago?
Knocked out piston grooves are the most common engine defect caused by knock
Knocked out piston grooves are the most common engine defect caused by knock. Knocked out piston grooves are the most common engine defect caused by knock.
The use of low-quality fuel always leaves traces in the engine; they must be distinguished. Let's start with the low octane number. If so, then the engine will periodically detonate. But traces of prolonged detonation work are clearly visible. The main “fingerprint” of detonation is the state of soot in the combustion chamber. The shock wave knocks it down to pure metal on the firing surfaces of the piston and cylinder head. If the carbon layer is even and uniformly black, claims for the octane number of fuel can be eliminated. Typical engine damage caused almost exclusively by detonation is the destruction of the piston inter-ring jumpers, as well as burnout of the valves.
Another trouble is tar. They are easy to detect by the characteristic coat on the inlet valve plates. Similar deposits form when the valve stem seals on the valve stems are destroyed and oil begins to penetrate through the gaps between the valve and the inlet guide. But such a reason for the formation of a fur coat is characteristic of older, and not warranty, motors. Therefore, if the surfaces of the intake valves are clean, the cause of the problems with the engine is probably not in the pitches.
Resins form a characteristic coat on the surface of the valve. If not, then the gas was clean
Resins form a characteristic coat on the surface of the valve. If not, then the gas was clean. Resins form a characteristic coat on the surface of the valve. If not, then the gas was clean.
It is often thought that clogged fuel filters are also a sign of tar in gasoline. However, resins are dissolved in cold fuel, so they cannot spoil the filters. No, the filters are clogged with mechanical impurities in gasoline.
By the way, there is a legal conflict. Imported cars are designed for the use of gasolines that meet foreign standards - for example, EN 228, where the resin content is normalized. And in our current fuel requirements, not a word about resins. What decision the court will take in these circumstances is known only to him. If in fairness, then we should take the side of the car owner, since any manufacturer supplying equipment to Russia must take into account local operating conditions, including the features of our fuel.
The next charge for gasoline is the use of unauthorized metal-containing additives. This question is usually resolved even at the stage of analysis of samples: gasoline is checked for the content of now forbidden lead, iron and manganese. However, the color of plaque deposited on candles, exhaust valves and lambda probes clearly indicates their presence in the fuel. Ferrocene, containing iron, gives a reddish-brown coating, manganese - a dun. And if the candles are just black, we boldly tell the servicemen: your lie, there was no piece of iron in gasoline!
Candlelight stains are traces of banned metal-containing additives
Candlelight stains are traces of banned metal-containing additives. Candlelight stains are traces of banned metal-containing additives.
Technical regulations also prohibit the use of methanol. But unscrupulous refuelers loved him very much. We met samples containing up to 30% methanol. In the study of gasoline samples, the alcohol content is also evaluated. Even if it was not found, prolonged use of such fuels leaves characteristic marks in the engine. For example, the sintered honeycomb of the catalyst and the failed lambda probe in the absence of characteristic ferrocene deposits can well indicate the presence of methanol. The controller understands its transcendental content and increase in the concentration of bound oxygen as an under-enrichment of the mixture and tries to correct the situation. Excessive unburned fuel flies into the catalyst - it is heated, the cells are sintered.