Disassembling the refrigerator engine: video instructions and step-by-step guide for repair

Disassembling the refrigerator engine (compressor) yourself is a task that frightens many novice craftsmen. However, with the right approach and the availability of basic tools, this procedure becomes completely doable even without professional experience. The main difficulty lies not so much in mechanical disassembly, but in understanding operation principle the sealed system and compliance safety precautions —after all, we are talking about a device operating under high pressure with refrigerant.

In this article we will analyze the entire process in detail: from preparing tools to diagnosing faults after disassembly. You will find not only text instructions, but a selection of training videos with expert comments, as well as unique disassembly schemes for popular compressor models (Danfoss, Secop, Embraco). We will pay special attention to typical errors that lead to engine failure after improper assembly.

Why you may need to disassemble a refrigerator compressor

Before you take on disassembly, it is important to understand whether the problem really lies in the engine. Often the symptoms that users mistake for a compressor malfunction are associated with other components of the refrigerator. Here are the key signs indicating the need for disassembly:

• 🔊 Constant hum without on/off cycles - the compressor runs “idle” without creating the required pressure.
• ❄️ Lack of cold with the engine running (check the thermostat and freon leakage first!).
• 💥 Short circuit of the windings —the compressor heats up, it smells like burning, the protection is triggered.
• 🛠️ Mechanical damage (for example, after a refrigerator falls)—the piston group may need to be replaced.

If you observe at least one of these signs, first check the power circuit (socket, cord, start relay) and pressure in the system a pressure gauge. Only after ruling out other causes should you start disassembling. Remember: 90% of "compressor breakdowns" actually associated with a freon leak or a malfunction of the start-up relay!

Preparing for disassembly: tools and safety measures

Disassembling the compressor refrigerator requires not only tools, but Special conditions. Here's what you'll need:

Safety warning:

⚠️ Attention! Before disassembly, be sure bleed the freon through the service port - its pressure in the system can reach 10-15 atmospheres. Work in a well-ventilated area: even a small leak of freon R134a or R600a can cause dizziness or nausea.

If you If you are not confident in your soldering skills or working with refrigerants, it is better to contact a specialist. Incorrect assembly can lead to depressurization of the system and complete failure of the refrigerator.

Step-by-step instructions: how to disassemble the compressor refrigerator

The disassembly process can be divided into 3 stages: dismantling the compressor, opening the case and diagnostics of internal components. Let's look at each stage in detail.

Stage 1: Removing the compressor from the refrigerator

Before removing compressor take a photo its connection - this will help to correctly connect the wires during reassembly. Next:

1. Disconnect start relay (usually secured with latches or screws).
2. Break the tubes connecting the compressor to condenser and evaporator, leaving a margin of 10-15 cm for subsequent soldering.
3. Unscrew the mounting bolts (usually 3-4 pieces) and carefully remove the compressor.

Stage 2: Opening the sealed case

This is the most crucial moment. The compressor housing is sealed, and to open it you will need:

1. Clamp the compressor in a vice vertically (oil filler pipe at the top).
2. Use a hacksaw or grinder to carefully cut off the top part of the body along the seam.
3. After opening, drain the oil into a prepared container - it can be reused if it is clean.

What to do if the oil turns black?

Blackening of the oil indicates overheating of the windings or the ingress of metal particles. In this case it is necessary:

1. Rinse the system with a special solvent.

2. Replace the oil with a new one (check the brand in the compressor passport).

3. Check the condition of the piston group - it may be necessary to replace rings or valves.

Stage 3: Diagnostics of internal components

After opening, inspect:

• 🔧 Piston group — for scuffing or ring wear.
• 🧲 Electromagnetic coil —check the integrity of the windings with a tester.
• 🚪 Valves —they should fit tightly, without cracks.

If you find mechanical damage, promptly In total, parts or the entire compressor will need to be replaced. To check the windings, use a multimeter:

Mode: resistance measurement (Ω)
Normal values:
- Between windings: 20-50 Ohm
- Between winding and housing: ∞ (break)

Video instructions: disassembling compressors of different brands

Theoretical knowledge is good, but a visual demonstration of the process greatly simplifies the task. We have selected the best videos with detailed comments for compressors of various brands:

• 📹 Danfoss (NL, NF series) - classic design with a vertical shaft. Pay attention to the method of fixing the housing:
• 📹 Embraco (EG, NE series) - Brazilian compressors with a horizontal cylinder arrangement. The video shows an alternative method of opening without an angle grinder.
• 📹 Secop (formerly Danfoss) - modern models with improved sealing. The author of the video demonstrates how check the pressure after assembly.

When watching the video, pay attention to:

1. Method of fixing the compressor when cutting (some models require special clamps).
2. The sequence of removing internal parts - for example, Embraco NE first remove the cylinder cover, and then the piston.
3. Methods for checking tightness after assembly (most often a soap solution is used).

⚠️ Attention! Videos from 2018-2022 may demonstrate outdated soldering methods (for example, using acid flux). Modern standards require the use of acid-free fluxes for copper tubes.

Typical mistakes during disassembly and how to avoid them

Even experienced craftsmen sometimes make mistakes errors that lead to irreversible breakdown of the compressor. Here are the most common of them:

Another critical error - incorrect assembly of the valve group. For example, if the suction and discharge valves are swapped, the compressor will work “in reverse”, creating a vacuum instead of pressure. Always check with compressor diagram (it can be found by model on the manufacturer's website).

Diagnostics after disassembly: when repair is possible and when not

After disassembly, you have to make a decision: repair the compressor or replace it with a new one. Here are the criteria that will help you decide:

• ✅ Repair is possibleif:

  - Only the rings or seals are worn out (replacing them will cost 3-5 times less than a new compressor).

  - The windings are intact, but the problem is mechanical part (for example, a valve spring is broken).

• ❌ Repair is pointlessif:

  - The windings have turn-to-turn closure (resistance between them is less than 15 Ohms).

  - The compressor housing has cracks or severe corrosion.

  - The piston group is worn out so much that the gaps exceed 0.3 mm.

For final diagnostics after assembly:

1. Connect the compressor to manometric manifold and check the pressure created (norm: 15-25 atm for R134a).
2. Listen to the operation of the compressor - there should be no extraneous knocks or vibrations.
3. Check the current consumption (for most household compressors the norm is 0.8-1.2 A).

If the compressor after repair does not produce the required pressure, but is mechanically sound, the problem may lie in insufficient amount of oil or clogging in the capillary tube. In this case, flushing the system will be required.

Alternative solutions: when disassembly is not necessary

In some cases, disassembling the compressor is an unnecessary measure. Here are situations when the problem can be solved without opening:

• 🔌 The start-up protection relay is faulty - replacing the relay costs 500-1500 rubles and takes 10 minutes.
• ⚡ Power supply problems - check the voltage in the socket (should be 220-230 V) and integrity power cord.
• ❄️ Freon leak - if the compressor works, but does not cool, it is enough refill system (without disassembling the compressor).
• 🧊 Clogged capillary tube —in this case, purging the system with nitrogen will help.

Before you start disassembling check these components —in 60% of cases the problem lies there. For example, a faulty relay can simulate the symptoms of a “burnt out” compressor: the engine hums, but does not start, or starts and immediately turns off.

FAQ: Frequently asked questions about disassembling the refrigerator compressor

Is it possible to disassemble the compressor without special tools?

Theoretically, yes, but without a pipe cutter, vacuum pump and pressure gauge collector you will not be able to correctly assemble the system back. Minimum set: pliers, screwdrivers, a hacksaw and a tester for checking windings. However, to solder the tubes you will still need a gas burner or a soldering iron with a power of at least 100 W.

How to understand that the compressor has burned out, and not just jammed?

If the compressor is jammed, it will not turn by hand (try turning the shaft through the pulley). If burned outthen:

• It smells like burning.
• The winding resistance is 0 (short circuit) or ∞ (break).
• The housing gets very hot when connected for a short time.

In the first case, you can try unwed a compressor (sometimes flushing with kerosene helps), in the second - just replacement.

How much does it cost to repair a compressor at a service center?

The cost depends on the type of fault:

• Replacement of the oil seal or rings: 2500-4000 rubles.
• Repair of windings: 3500-6000 rubles. (but it is often cheaper to buy a new compressor).
• Complete overhaul with replacement of valves: 5,000-8,000 rubles.

For comparison: a new compressor costs from 4,000 to 12,000 rubles. depending on the model. Repair is justified only for rare or expensive compressors (for example, Danfoss SC15G).

Can a compressor from an old refrigerator be used for other purposes?

Yes, but with reservations. Compressors from refrigerators are often converted to:

• 🔧 Spray guns - to create a pressure of 3-5 atm.
• 🚗 Inflating tires (receiver and gearbox required).
• 💨 Airbrushes - after modifying the valve group.

However, remember: household compressors are not designed for long-term operation (maximum 20-30 minutes continuously), otherwise they will overheat.

How to check the compressor after repair?

After assembly, perform the following steps:

1. Connect the compressor to gage manifold and check the pressure created (must be at least 15 atm for R134a).
2. Check the current consumption of the clamps (must correspond passport values).
3. Listen to the operation - there should be no extraneous noise or vibrations.
4. Connect to a system with freon and check the discharge temperature (the condenser should heat up).

If everything is in order, the compressor can be installed back in the refrigerator.