When carrying out renovation work in an apartment, many people often face a situation where they need to replace an old faucet. This largely simple procedure can become a serious problem if the faucet is installed on old metal pipes.
After all, earlier, when installing such equipment, plumbers screwed the mixer eccentrics directly into the bends made of cast iron. However, after prolonged use, the eccentrics stick to the pipe walls, and therefore their removal often leads to the destruction of parts, while part of the thread may remain inside the pipe.
It will be extremely difficult to remove such parts from the pipeline in the future.
This article will discuss how you can avoid such situations and solve the problem without complications in the form of eccentric failure.
How to unscrew a large bolt without a key?
clamp the nut in a rigidly fixed vice and unscrew it, rotating the entire part or assembly, if possible; clamp a small separate vice and try to unscrew the nut with it; use a pneumatic impact wrench; drill out the threaded rod on which the nut is stuck.
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The first rule is to work carefully
So, in most cases, if we are talking about a modern plastic or metal pipeline, there should be no problems with unscrewing the eccentrics. However, in any case, before starting work, you should prepare the necessary tool in the form of a special adjustable wrench.
Now manufacturers make eccentrics with special edges, which allow you to quickly unscrew the element from the pipe.
It’s another matter if you need to replace the old eccentric, but the owner does not want to remove the pipes. In such situations, you will have to act especially carefully so as not to crush the eccentric. If, however, part of the thread remains in the pipe during the process, then you should use the recommendations of specialists.
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Features of eccentric furniture screeds, installation rules
In the production of furniture, various types of fasteners are used, which ensure the reliability and durability of the structure. The eccentric furniture tie has become the most common in recent years. It is also known as “minifix” or “rastex”. An eccentric tie allows you to fasten elements at different angles, assemble and disassemble products several times. Furniture assembled using such an element is incredibly durable.
Some background information
For many years, in the domestic production of furniture made from laminated chipboard, a screw tie was used. In our country it is called “kon”, and in Europe it is called single-element or Einteilverbinder. Despite the low price of this screed, it has one significant drawback - the confirmation heads, even under the plugs, are very noticeable on the walls of the case. And this, in turn, makes it not of very high quality and attractive. Furniture assembled without visible fasteners looks more solid and beautiful and automatically belongs to a higher segment.
How to tighten the nut on the faucet?
To connect the mixer, all you need is a screwdriver, a small and large adjustable wrench, pliers, fum tape or flax. You may need a socket wrench to tighten the bottom clamp nut.
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Assembly sequence
To install eccentrics, you must have a certain tool:
- a set of drills with a diameter of 7.0 mm (for the rod body), 53.0 mm (for tightening the stand);
- screwdriver;
- Forstner router with a diameter of 15.0 mm;
- screwdriver, pencil, awl and square (ruler).
The assembly sequence is as follows:
- a restex stand is screwed into the plane of the panel body, to which another part will then be connected at the end side;
- An eccentric is mounted at the end of the second shelf, tightening the rod by turning it towards itself.
To maintain utmost punctuality in fitting the required holes, a template is often used.
Installation of equipment
Installation of new eccentrics is carried out in two stages:
- at the first stage it is necessary to attach the adapter to the pipes;
- at the second stage - connecting the adapters to the mixer.
Attaching the eccentric to the pipes
To attach the device to the pipes you will need:
- keys of appropriate sizes;
- insulating material, which can be linen thread, a special compound, FUM tape, and so on.
Installation is carried out according to the following scheme:
- determining the optimal position of devices for connecting the mixer. At this stage, it is necessary to calculate the number of eccentric revolutions that must be made for correct installation of the equipment;
- fitting of a mixer;
- insulation of threads using the selected material;
Thread sealing with linen thread
- installation of the eccentric.
To protect the eccentric coating when tightening the device with wrenches, it is recommended to use a gasket or union nut.
What to do if the eccentric breaks
At the moment, professional plumbers have developed several ways to solve this problem. Moreover, the method depends on the quality of the fitting thread.
- If the fitting is of good quality and can withstand serious mechanical loads, then the remaining threads can be unscrewed from the pipe using a chisel. In this case, it is necessary to select the tool in such a way that its pointed part is larger than the size of the fitting. The process itself is as follows. With a hammer blow, the chisel is driven inside the eccentric. Next we unscrew the fitting, holding the chisel with a gas wrench.
- If the eccentric is not of very good quality and is strongly stuck to the pipe. in this case, you need to cut it from the inside with a hacksaw blade into a cross. Next, remove parts of the fitting using a screwdriver.
When carrying out all such procedures, you should put a small piece of material into the pipe, this way you can avoid pieces of metal getting inside the pipeline.
The methods presented above were developed from years of practice and are therefore not taught to would-be plumbers during training. On the other hand, they have repeatedly proven their effectiveness and therefore can be used if necessary.
However, even before starting work on replacing the mixer, the owner of the premises should answer the question of whether it is worth leaving the old pipes or whether it is better to replace them.
Do you know how to unscrew the eccentric from an old mixer if it is very stuck? Share your experience in the comments.
Types and choice of thread sealant
The threaded connection facilitates the joining of pipes and plumbing fixtures and provides a certain level of sealing. However, in practice this is not enough. To prevent leaks from appearing at the connection point, seals are used.
For plumbing, devices are chosen that improve sealing and are resistant to hot water.
FUM tape
PTFE sealing material is a tape 1 inch wide or less , since the length of the threaded connections is short. FUM tape is most often used for sealing in plumbing systems, as it is not afraid of hot water and is very durable.
The main advantage of the tape is the preservation of elasticity and elasticity until complete wear - more than 10 years . The material tolerates heat up to +300°C and withstands pressure up to 100 atm . It has a high slip coefficient, so screwing a part with such a seal onto a thread is quite simple. Disadvantage of the product: there is no expansion effect , which can lead to depressurization of the hot water supply. In addition, it does not perform well on pipes with large diameters.
Sealing thread
Polyamide or fluoroplastic fiber stretched into a round thread. Polyamide is used only when installing water supply or sewerage systems: the material can withstand no more than +130°C . PTFE thread is much more stable - it is not damaged when heated to +300°C , and is inert to the action of acids and alkalis.
The thread is more difficult to use : it needs to be wound around the threads to achieve the desired seal. But when dismantling, the joint density does not disappear, so there is no need to re-wind the thread.
Plumbing linen
Flax and hemp tow. The fiber is extremely durable, not afraid of high temperatures , and can be used for pipes of any diameter. Can be used when installing water supply and heating systems. Minus: it provides good sealing only in combination with plumbing paste .
It is quite difficult to work with tow : you need to strictly observe the number of turns and ensure the uniform placement of the fiber. Flax is recommended for use only by experienced users, although it is much cheaper than FUM tape or special sealant .
Sealing paste
Can be used for any systems with a non-aggressive environment . Withstands temperatures up to +210°C and pressure up to 100 atm . Used to seal pipes up to 3 inches in diameter . Plumbing linen is required to “accompany” it.
They produce hardening and non-hardening composition . The first one can withstand high pressure, but when drying it gives some shrinkage. The non-hardening paste does not lose elasticity, so it retains its volume when dried. In addition, the composition protects against corrosion. However, the paste can only be used in low pressure systems.
Anaerobic sealant
Special composition for threaded connections . Mixtures are available with varying degrees of strength. To install the mixer, take a standard one, designed for minimal vibration.
Anaerobic sealant is temperature sensitive during installation. If the air in the room is heated to less than +15°C, the composition takes a long time to harden.
There is no universal sealant or sealant that is suitable for all situations. However, the operating conditions of the faucet in the bathroom or kitchen are not severe, so it is easier to choose a device here.
