Disassembling the refrigerator compressor is an extreme measure, which is resorted to when diagnostics clearly indicate an internal breakdown. sealed unit. Most often we are talking about jamming of the piston group or an interturn short circuit, which cannot be eliminated without opening the housing. The main obstacle for the home craftsman is the method of sealing: factory welding of the body requires mechanical intervention, but the use of an angle grinder creates a risk of metal shavings getting inside the mechanism.
Metal dust generated during cutting is the main enemy of the freon circuit and rubbing parts compressor. Even microscopic particles can destroy a new valve or damage the cylinder bore, rendering repairs pointless. Therefore, the question of how to disassemble the motor from a refrigerator without an angle grinder is not just theoretical, but critically important for maintaining the maintainability of the unit.
In this article we will look at methods for carefully dismantling the top housing cover using hand tools and specialized techniques. You will avoid overheating of the windings and keep the internal components clean, which is especially important when trying to replace a valve group or eliminate a jam. The correct approach will allow you to carry out troubleshooting without fatal consequences for the mechanism.
Risk assessment and preparation of the workplace
Before you begin to dismantle the cover, you must realize that you are violating the factory tightness compressor crankcase. This action irreversibly changes the status of the device: after opening it, it can no longer be simply installed back without a complete overhaul, replacing the filter-drier and evacuating the system. If your goal is simply to obtain scrap copper, the methods may be crude, but sterile cleanliness is required to restore functionality.
The work area should be organized in such a way as to prevent dust and dirt from entering the housing when the cover is removed. Ideal option you will use a table with a smooth surface covered with clean rags or paper. It is also necessary to ensure good lighting, since the internal parts of the compressor are dark in color and small elements are difficult to distinguish in dim light.
⚠️ Attention: Before any manipulations, make sure that the compressor is completely disconnected from the power supply and the capacitors (if they are in the external circuit) are discharged. Residual voltage or accidental switching on can lead to electric shock.
It is important to consider that there may be oil inside the case, which during prolonged use could change its properties or contain wear products. Hand protection and the eye is required, since working out can cause skin irritation, and in case of accident splashing onto the mucous membrane. Prepare a container for draining the oil in advance.
Necessary tools for careful opening
To perform high-quality disassembly without the use of power tools that create sparks and chips, you will need a set of hand tools. The main tool will be a chisel with a narrow tip, which allows you to make point cuts in the area of the weld. A dull chisel cannot be used, as it will crush the metal rather than cut through it.
In addition, you will need a hammer weighing about 400-500 grams. A tool that is heavier can cause deformation of the body, while a tool that is too light will not provide enough momentum to break the weld joint. You also need pliers, screwdrivers of different sizes and, possibly, a hacksaw for metal with a new blade for cutting grooves.
- 🔨 A narrow chisel and hammer are the main impact tools for destroying the weld around the perimeter.
- 🔧 A set of screwdrivers and pliers - for dismantling clamps, springs and internal elements after removing the cover.
- 🧤 Safety glasses and gloves are mandatory equipment to protect against oil splashes and metal chips.
Some craftsmen use special pullers or clamps, but in a home workshop you can get by with a standard set. The main thing is the presence a needle file or a file, which can be used to clean the cut edge after separating the cover, so that it does not interfere with reassembly.
☑️ Preparation for opening the compressor
Methods removing a weld seam without an angle grinder
There are two main ways to open the case without using a grinder: the method of notching around the perimeter and the method of knocking out the lid. The first option is more labor-intensive, but safer for the insides. Its essence is to use a chisel and hammer to go around the entire circle of the welded joint, making deep notches.
Apply blows at an angle of 45 degrees to the surface, trying to cut through the weld metal to a depth of 2-3 mm. Move in a circle, gradually going deeper, until you feel that the integrity of the connection is broken. After this, you can try to pry the cover with a screwdriver or gently tap it along the contour for final separation.
The second method, often called “knocking out,” is suitable for compressors where the top cover has a slight play. In this case, several deep notches are made in the upper part of the seam, after which the lid is cut off with a sharp but precise blow from above. This method requires some skill, since inaccurate blow it can damage the internal springs of the engine suspension.
Why can’t you cut completely with a hacksaw?
A full cut in a circle with a hacksaw takes a very long time and is almost impossible due to the design seam, which is often located in a recess. A hacksaw is used only to create initial cut guides for the chisel in order to set an even line of destruction of the metal.
If the seam is made well and the chisel slides, you can use the thermal expansion method, but with extreme caution. Heating the seam red-hot with a gas torch, followed by rapid cooling with water, sometimes allows the weld to crack, but for home conditions this is risky due to oil vapors. Mechanical destruction remains the most reliable option.
Dismantling the internal suspension and electric motor
After removing the cover, you will see the “heart” of the refrigerator - an electric motor enclosed in a steel casing and suspended on springs. These springs are under significant tension as they compensate for the vibration of the operating compressor. Removing the motor requires care so that the spring does not jump off and hit the parts.
The first step is to disconnect the suction and discharge pipes, if they have not already been sawed off earlier. They are usually soft soldered or welded. Carefully file them at the very entrance to the body, being careful not to drop the sawdust inside. Then remove the start and start relay from the contact group at the end of the motor.
To remove the motor, you need to unhook the lower hooks of the springs from the studs welded to the bottom of the housing. It is convenient to do this with long pliers or a special drift. It is important to fix the motor with a second hand or ask an assistant, since after unhooking the last spring it can move freely inside the tank.
| Suspension element | Function | Risk during dismantling | Tool |
|---|---|---|---|
| Upper spring | Vertical vibration damping | Jumping and impact walls | Pliers |
| Bottom spring | Suspension support point | Hand injury during compression | Punch/Rod |
| Rubber dampers | Noise insulation | Rupture due to rubber aging | Tweezers |
After removing the motor, carefully inspect the condition of the springs. Often the cause of refrigerator noise is a burst spring or its contact with the body. If you plan to reassemble the compressor, the integrity of these elements is critical.
Diagnostics of the piston group and valves
When the motor is removed and turned over, access to the cylinder-piston group opens. This is most often the cause of the breakdown. Carefully inspect repetal valves for cracks, deformation or carbon deposits. Even a microscopic crack in the valve plate results in loss of compression and inability to pump freon.
Check the condition of the piston and cylinder. There should be no deep burrs on the cylinder mirror. If the piston dangles or, conversely, is tightly jammed, this indicates wear of the liners or destruction of the connecting rod mechanism. In case of jamming, a careful attempt to develop the mechanism sometimes helps, but often this requires replacing the connecting rod or piston.
Pay special attention to the connecting rod and crankshaft. Backlash in connections is unacceptable. If you find wear on a piston pin or connecting rod bushing, simply replacing the bushing may not solve the problem, since the geometry of the parts is already compromised. In such cases, it is often cheaper to replace the entire compressor than to search for rare parts.
⚠️ Attention: When inspecting internal parts, use only clean tools. The ingress of lint from fabric or dust can become an abrasive that will quickly disable the repaired unit after startup.
Assembling and sealing the compressor housing
Assembly is performed in the reverse order, but taking into account the fact that there is more weld seam no. To seal the case, special repair plates with rubber seals are used, or soldering with soft solder is used, if the cover design allows. Tightness is a key parameter on which the life of the refrigerator depends.
If you use the method of installing a repair cover with bolts (through drilled holes and thread), be sure to use a heat-resistant sealant that is resistant to freon and oil. Regular silicone can break down when exposed to refrigerant. Press the lid tightly, evenly tightening the fasteners around the perimeter.
After mechanical assembly, it is necessary to replace the filter-drier, since the old one was saturated with moisture from the air when the circuit was opened. Without replacing the filter, the system will quickly become clogged with ice or acid formed from the reaction of moisture with oil. This is a mandatory step that cannot be ignored.
The final stage is evacuation of the system and refilling with freon. These operations require a pressure gauge station and a vacuum pump. It is strictly prohibited to start the compressor without removing air and moisture from the circuit.
Frequently asked questions (FAQ)
Is it possible to disassemble the compressor without draining the oil?
Technically, you can file the seam, but when opened, the oil will flow out, dirtying everything around. In addition, the oil must be drained and inspected for the presence of metal shavings, which is an important diagnostic sign. Therefore, draining is required.
How to replace welding during reassembly?
It is difficult to weld a body using arc welding at home due to the risk of burning through thin metal and evaporating remaining oil, which will cause a vapor explosion. They use either hard soldering or mechanical pressure plates with rubber gaskets and a bolted connection.
Does it make sense to repair an old compressor?
Repair makes sense if the fault is a break in the starting winding (rewinding) or broken valves, and the motor and cylinder itself are in perfect condition. If there are scuffs on the cylinder or the insulation of the windings is burnt out, it is easier to buy a new unit.
What kind of oil to fill in after repair?
The type of oil depends on the type of freon. For R12 and R134a, mineral oils are used (for example, Mobil, Shell), and for R600a, synthetic oils (POE polyester) are used. They cannot be mixed, as this will lead to the formation of sediment and blockage of the capillary.
Why, after assembly, does the compressor hum, but does not pump?
Most likely, the tightness of the connections inside is broken, the valves are installed incorrectly (the sides are mixed up), or there is air left in the system, creating a gas lock. An error is also possible when assembling the piston group.