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A contest with a prize! the puzzle about the piston rings and vane pump

For the answer to the task № 138 “Cool I want” (No. 8, 2019) Dmitry Spiridonov, living in the Moscow region, receives from the company Playme-Russia combostyle “3 in 1” Playme Turbo. And now a new difficult task!Alexey Revin “driving”Expert

TASK № 141

Where rings

Boasted to local garage get-togethers Doc Pavlovich: that in my Volvo on the front of the engine two piston rings more than the other machines. Think is responsible Sergeyevich, rings, Eka Prodigy. Yes I have, they say, in the same places devices like vane pump’s faces!

Help present at this conversation motorists to understand what they are talking about luminaries.

It is worth mentioning that short answers are not even considered.

The answer marked as “Contest” send before December 1, 2019 at the address: 107045, Moscow, Seliverstov per., 10—, or e‑mail to the e-mail exp@zr.ru. Enter your phone number or other method of rapid communication.

We pledge to read all your posts on the topic. The prize will be marked not only correct, but also the most complete solution to the competition problems with detailed answers.

And now to sum up the results of the “Contest of experts” from the August issue of the magazine “Behind the wheel”.

Before a person versed in electrics, the question arose: how to diagnose a broken air conditioning on Renault Logan, the simplest way and know if your electrician, or have to go to the service maintenance of air conditioners for in-depth diagnostics? Answers to the problem come very much, and we look at the complete and correct answer.

Logan is equipped with a simple air conditioning with manual control. The system includes two heat exchanger, a compressor driven from the engine, gearbox, receiver drier and refrigerant pressure sensor. When the system is off, the refrigerant in the system is under pressure 5-7 bar. It is important that the pressure of the refrigerant depends on the temperature; the figures given for temperature of 20 °C.

When switching the system on, the compressor starts to compress the refrigerant, providing an outlet pressure of about 10-12 bar. In the condenser, standing in front of the radiator of the engine, the gas is intensively cooled and becomes liquid. In the receiver the refrigerant passes and purified. The tube it comes in reducer, which is a throttle valve, the output from which pressure and temperature are greatly reduced to 1 bar and -7 °C respectively. So the refrigerant enters the evaporator, passing from liquid to gaseous state. Passing through the evaporator, the air gives up heat to the refrigerant and becomes cold. From the evaporator the refrigerant enters the compressor, and the cycle repeats.

Elements of the air conditioning system: 1 — condenser; 2 — receiver; 3 — pressure sensor; 4 — valve for refilling and release of the refrigerant in the high pressure pipeline; 5 — evaporator; 6 — electric fan heater; 7 — reducer; 8 — valve for filling and release of the refrigerant in the low pressure pipeline; 9 — compressor; 10 — the electric cooling fan.Elements of the air conditioning system: 1 — condenser; 2 — receiver; 3 — pressure sensor; 4 — valve for refilling and release of the refrigerant in the high pressure pipeline; 5 — evaporator; 6 — electric fan heater; 7 — reducer; 8 — valve for filling and release of the refrigerant in the low pressure pipeline; 9 — compressor; 10 — the electric cooling fan.

Recall the conditions under which the operation starts. In addition to the pressed button And should work the heater fan. And the inclusion depends on the indication of the refrigerant pressure sensor. The control unit will allow the inclusion of when the sensor will register from 2 to 24 bar. Then closes the electromagnetic clutch and the rotation from the timing belt will be transmitted to the compressor shaft. When the output pressure of this range the compressor is shut off. By the way, when the air conditioner is switched on, the electric cooling fan.

Now the main question: how to check which of the systems of conditioning haywire — electrics or hydraulics?

To ensure good electrical parts, you need to simulate the working pressure. To do this disconnect the connector from the pressure sensor (jumper anything in the connector is not necessary) and turns the sensor from the tube (the valve design is such that leakage will not). Clean the sensor and connected to the connector. When the button is pressed the air conditioner and turned the fan heater serves the air from a tire compressor in the working cavity of the sensor. When the readings of the pressure gauge above the 2 bar the a / C compressor clicks to engage, and the engine load should increase. If that happened, all the electrics, including the pressure sensor is defective. And if coolness does not, then there is not enough refrigerant. Planning a visit to a specialized service for the diagnosis of leaks, eliminate leakage and refill.

And check the circuits on the standard algorithm. Look at the fuse and relay for the same model, such as fog lights. Check is voltage to the clutch compressor. When served, and the inclusion of no — faulty electromagnetic clutch.

All the participants thank you. Dmitry Spiridonov victory! He receives from the company Playme-Russia combostyle “3 in 1” Playme Turbo.

  • Do they work air at 0°C and below? Read about it here.

A contest with a prize! the puzzle about the piston rings and vane pump

For the answer to the task № 138 “Cool I want” (No. 8, 2019) Dmitry Spiridonov, living in the Moscow region, receives from the company Playme-Russia combostyle “3 in 1” Playme Turbo. And now a new difficult task!

A contest with a prize! the puzzle about the piston rings and vane pump

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