How to properly cut a refrigerator compressor: tools, equipment and safety measures

Disassembling a compressor refrigerator is a task that craftsmen face when disposing of equipment, repairing with replacement of parts, or making homemade devices (for example, vacuum pumps or compressors for aeration). However, this process requires not only physical strength, but also knowledge of the design, safety rules and specific techniques. Unlike disassembling the refrigerator body, working with a compressor carries the risk of exploding residual refrigerant, cutting on metal edges and damaging electrical components.

In this article we will look in detail at how to cut a refrigerator compressor without risk to healthwhat tools are needed for different stages of the work, and what to do with the individual parts after separation. We will pay special attention sealed models (for example, Danfoss, Embraco, Secop), since their design differs from the open compressors of old Soviet refrigerators. If you plan to use the parts for secondary purposes, here you will find tips on cleaning and preparing them.

Preparing to separate the compressor: tools and precautions

Before you start cutting, you must make sure that the compressor is completely de-energized and freed from refrigerant. Even if the refrigerator has not been working for a long time, freon may remain under pressure in the system. Experienced craftsmen recommend waiting at least 24 hours after turning off the powerso that the gases dissipate naturally.

Here is the minimum set of tools you will need:

• 🔧 Set of open-end wrenches (sizes 10–22 mm) - for unscrewing fasteners and tubes.
• 🔨 Angle grinder (grinder) with a cutting disc for metal (1–1.6 mm thick).
• 🛠 Hacksaw metal - for accurate cutting in hard-to-reach places.
• 🧲 Magnetic holder or tweezers - for removing small parts from oil.
• 🧤 Protective gloves (preferably rubber-coated) and glasses.
• 🔥 Powder-type fire extinguisher - in case of oil fire or gases.

⚠️ Attention: If the compressor was previously operated in ammonia (in industrial refrigerators), its disassembly at home is strictly prohibited! Ammonia is toxic and explosive - such work should be carried out in specialized workshops with exhaust ventilation.

Before starting cutting, be sure to drain the oil from the compressor. To do this:

1. Turn the compressor over so that the drain hole (usually closed with a plug) is at the bottom.
2. Place the container and carefully unscrew the plug with a 17 or 19 mm wrench.
3. Allow the oil to drain completely (it may take up to 30 minutes).

Step 1: Dismantling compressor from the refrigerator

If the compressor has not yet been removed from the refrigerator, start by disconnecting it. In most models (Atlant, Indesit, Samsung) it is attached to the frame with four bolts and connected to a tube system. Procedure:

1. Disconnect the refrigerator from the network and drain the water from the drainage system (if there is one).
2. Cut the tubes connecting the compressor to the condenser and evaporator using a pipe cutter or grinder. Do not use a hacksaw - sawdust can get inside the system.
3. Unscrew the mounting bolts (usually a 10 or 12 mm wrench) and remove the compressor from the spring shock absorbers.

At this stage it is important not to damage starting relay (the black box with wires), if it is still useful. Disconnect it, remembering the location of the terminals, or take a photo of the connection diagram.

Step 2: Marking and initial cutting of the housing

The compressor housing consists of two parts: the upper (where the electric motor is located) and the lower (the crankcase with oil). They are connected either by a weld or by bolts along the perimeter. In modern models (Embraco EGX, Danfoss NL), welding is more often used, in old Soviet (DXM-3, FG-0.12) - bolts.

How to determine the type of connection:

• 🔍 Inspect the body for the presence of bolt heads around the perimeter. If there are any, they need to be unscrewed.
• 🔎 If there are no bolts, but an even seam is visible, this is welding. It will have to be cut with a grinder.

To cut a welded seam:

1. Secure the compressor in a vice or on a stable surface (for example, on wooden blocks).
2. Draw a cutting line around the perimeter of the seam with chalk or a marker. Step back 1-2 mm from the seam towards the top so as not to damage the internal parts.
3. Put on the respirator and turn on the angle grinder. Cut at low speeds to avoid overheating the metal.

⚠️ Attention: When cutting, do not direct sparks towards containers with oil or flammable materials. If there is refrigerant left inside the compressor, it can ignite due to high temperature!

What to do if the grinder disk jams?

If the disk jams during cutting, immediately turn off the tool and wait until it stops completely. Do not try to pull out the disk by force - this may lead to its destruction. Instead, carefully loosen the compressor or use a second blade to make a cut on the other side.

Step 3: Separating the Parts and Removing Internal Parts

Once the housing is cut around the perimeter, the parts can be separated using a screwdriver or pry bar. Inside you will see:

• 🔩 Electric motor with a rotor and stator.
• ⚙️ Crank mechanism (in piston compressors).
• 🛢 Crankcase with oil residues and metal shavings.
• 🔌 Terminal block for connecting power.

To remove parts:

1. Carefully remove the upper part of the case, avoiding sudden movements - moving elements may remain inside.
2. Disconnect the wires from the terminal block, remembering their location (or take a photo).
3. Remove the rotor and stator. In some models they are secured with a retaining ring - you need to pry it off with a screwdriver.
4. Take out the piston group. It is usually fixed with a pin, which can be knocked out with a hammer and a bit.

Step 4: Clean and prepare parts for further use

Removed parts are usually covered with a layer of oil, dirt and metal shavings. To clean them:

• 🧽 Wash the parts in kerosene or white spirit, then dry with compressed air.
• 🧲 Use a magnet to collect metal shavings from the crankcase.
• 🔥 Sandblasting or heating can be used to remove old oil from the housing (for example, a blowtorch).

Pay special attention copper tubes —they can be used for the manufacture of coils, radiators or spare parts for other refrigeration systems. To clean them:

1. Cut the tubes with a grinder or pipe cutter.
2. Pass a wire with a brush through them to remove carbon deposits.
3. Rinse with acetone and blow through air.

⚠️ Attention: If you are going to use a compressor to create a vacuum pump, make sure that all seals (oil seals, gaskets) are replaced with new ones. Old rubber parts may be dry and leak air.

Typical mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when disassembling compressors. Here are the most common of them:

• 🔥 Ignoring residual refrigerant. If you do not wait 24 hours or do not bleed gas through the service port, a miniature explosion may occur during cutting.
• 🔨 Using a blunt disk on an angle grinder. This leads to overheating of the metal and deformation of the body.
• 🧲 Loss of small parts (springs, pins, o-rings). It is better to put them in a separate container with a magnet at the bottom.
• 💡 Damage to the stator winding during removal. If you plan to use the motor, cut the housing carefully without touching the coils.

Another common problem is Improper disposal of oil. Compressor oil belongs to hazard class 3–4 waste and should not be discharged into the sewer or onto the ground. It can be:

• Turned to a waste oil collection point (often free of charge).
• Use to lubricate non-essential mechanisms (for example, gate hinges or garden equipment).
• Process into biofuel (if there is appropriate equipment).

Ideas for recycling compressor parts

A disassembled compressor is a treasure trove of spare parts for do-it-yourselfers. Here are some ideas of what can be made from its parts:

• 🔧 Vacuum pump. To do this, you will need a working electric motor and a piston group. Can be used for pumping air from air conditioning systems or vacuum packaging.
• 🚜 Homemade compressor for painting or inflating tires. You will need to modify the valve system and add a receiver.
• 🔥 Furnace for roasting or melting metal. The compressor housing is excellent as a basis for a small muffle furnace.
• 💡 Electricity generator. By rewinding the stator, you can get a low-voltage generator for a windmill or bicycle generator.
• 🛠 Press for squeezing oil or juice. A piston group with a force of up to 100 kg/cm² is suitable for a small hydraulic press.

If you do not plan to use the parts yourself, they can be taken to scrap metal collection points. The following are especially appreciated:

• Copper stator winding (up to 5–7 kg of copper in one compressor).
• Aluminum parts of the piston group.
• Cast iron body (taken by weight).

⚠️ Attention: Before scrapping the compressor, make sure that the oil is completely drained from it. Otherwise, the collection point may refuse to accept it or significantly reduce the price.

FAQ: Frequently asked questions about disassembling compressors

Is it possible to cut a compressor with a hacksaw?

Technically yes, but it will take 5-10 times longer than with a grinder. The hacksaw is only suitable for thin-walled compressors (for example, from small freezers). For standard models (Embraco NM, Danfoss SC) it is better to use an angle grinder with a metal disc.

How to understand that there is no refrigerant in the compressor?

Signs of a lack of freon:

• The compressor does not cool (if connected to system).
• When the tube is punctured, there is no hissing of gas.
• More than 24 hours have passed since the shutdown.

However, it is impossible to visually determine the remaining refrigerant - always use protective equipment.

What to do if smoke comes out during cutting?

Stop working immediately! Smoke indicates ignition of oil or residual refrigerant. Shut off oxygen (cover the compressor with thick cloth or sand) and use a powder fire extinguisher. Do not use water - it may react with hot oil.

Can I use oil from a compressor for a car?

No. Compressor oil has different additives and viscosity that do not meet automotive oil standards. It can only be used to lubricate non-essential mechanisms (for example, door hinges) or after complete recycling.

How to separate copper from the stator without damage?

The best way is to carefully cut the winding with a grinder with a thin disk (0.8–1 mm) and remove the wire one by one. An alternative is to heat the stator to 300–400°C (for example, in a muffle furnace), after which the varnish burns and the copper is easily separated. Be careful: toxic fumes are released when heated!