Replacing nozzles in a gas stove: purpose, structure and detailed instructions for replacing nozzles
It’s hard for a thrifty owner to part with things that have served for a long time and become familiar, isn’t it? If you purchased a new gas stove, and the old one is still functional, then, you agree, it is more rational to take it to the dacha, where it will serve for many more years.
To switch to bottled gas, you just need to replace the nozzles in the gas stove. If you have the skills to do repair work, this is not at all difficult to do yourself, so you can save on both the purchase and the cost of calling a technician. Why replacement is needed and how it is done we will consider in detail in our article. We will provide step-by-step instructions, providing them with visual photos and useful videos.
The content of the article:
Purpose and design of jets
Of the three systems existing in a gas stove, the gas system, consisting of shut-off valves, pipelines, burners and burners, is the basic one. We wrote in detail about the structure of the stove in this material.
Regardless of the stove model, the composition of its components is the same, and together they serve to transport the gas supplied to the stove, mix it with air (for oxygen saturation), and dose it to the divider holes. On the gas path, the stop valve and burner nozzle, otherwise called a nozzle or nozzle, are responsible for the dosage and pressure of gas.
Operating principle and design of the nozzle
The gas supplied to the gas stove burner (the device where the gas-air mixture is formed) can be of different types - natural (methane) or liquefied (balloon – propane).
For efficient, stable operation of a gas stove, gas mixing and supply to the burner divider must be carried out evenly, at a certain speed. For this purpose, the design of the gas burner has an important part - a nozzle.
Let's take a closer look at what jets are in a household gas stove. This is a part of the burner designed to ensure that gas enters the burner with the appropriate pressure in the required volume. For this purpose, a calibrated passage hole is made in the nozzle, which determines the parameters of the gas jet that meet the conditions specified by the manufacturer.
These conditions correlate with the optimal power of the gas stove, determined by the most complete combustion of the gas consumed, indicated by the manufacturer among the technical characteristics of the equipment.
Diameter and thread of injectors
The injectors are bolt-shaped, equipped with an external thread and a hexagonal slot head. The through hole (nozzle), located in the center of the part, has a diameter calculated according to the type of gas, its pressure, as well as the method of supplying the gas-air mixture and the power of the burner.
For bottled gas, the nozzle diameter (with the same design and burner power) is needed a little smaller, for natural gas – a little larger.
If you install jets for natural gas on a stove connected to bottled gas, the pressure of the gas entering the burner will be greater, less air (and oxygen) will be captured, the flames will be noisy and long, have an orange color and smoke. In this case, the situation can only be changed by replacing the jets with parts with a smaller nozzle diameter.
In most models, the hexagonal slot of different jets has the same standard size, so to unscrew the replacement part of different plates, you need a 7 mm wrench.
The diameters of the holes, the pitch of the thread and the length of the part are different in the jets (for natural fuel - the length is shorter, for liquefied fuel - longer). The dimensions of the channel diameter are stamped on the head of the part (in hundredths of mm, much less often the marking is in mm).
Jets are replaceable parts. When stoves are sold, they are usually equipped with nozzles designed for natural gas. The components of many modern models of gas stoves also include nozzles designed to switch them to bottled gas. If this is not the case, then a set of jets can be purchased separately there, in specialized stores, or via the Internet.
The nozzles are made of brass. It is thermally stable, durable and corrosion resistant.During operation they heat up slightly. In the old-style stoves, the vertical nozzles were made of brass, and the base into which they were screwed was made of an aluminum alloy. Therefore, when replacing or cleaning the nozzle, you must be careful not to damage the threads.
If the documents for the unit are lost, determining the nozzle thread of gas stoves when purchasing replacement parts may cause some difficulty. However, determining the thread pitch of the nozzles of most plates is not difficult, since there are only two values - 0.75 and 1.0 mm.
Until 2009, jets for plates were produced with a thread pitch of 1 mm. Most new stoves produced since 2009 have nozzles with a 0.75 mm thread. To determine the size, simply apply a ruler with clearly visible millimeter divisions to the thread.
When converting the stove to gas from a cylinder, not only the nozzles are replaced. Replace and gas reducer.
Popular injector malfunctions
Typically, jets last a long time. Their replacement is required when switching to another type of gas or in case factory defect. More often there is a need to clean them from soot and clogging.
The following symptoms are associated with clogged injectors:
- the stove is smoking, instead of an even blue flame, red-yellow tongues appear above the divider;
- one of the burners does not light;
- the burner does not burn well and sometimes goes out;
- when the button (handle) that turns on the ignition device is released, the oven flame goes out or does not ignite at all - this happens when, due to insufficient gas supply, the heat generated is not enough to heat the temperature sensor, and the fuel supply is shut off automatically by the gas control system.
Replacing a separate nozzle is required if the gas burns so intensely on the burner that the flames come off the divider. This happens in the case of a manufacturing defect. If a similar picture is observed on all burners, it is worth checking the gearbox.
You will need a few tools for work related to injectors: a set of open-end and socket wrenches, a Phillips screwdriver, a thin needle (it is better to attach it to the end of a pencil), wire or fishing line. A soap solution or other liquid product used to wash dishes is also useful for cleaning. Abrasives must not be used!
Most often you need keys:
- for old jets — 8 mm (for liquefied gas — 7 mm);
- for burner nuts — 14 mm;
- for oven pipe nozzle - 17 mm.
However, since the slab designs are different, other keys may be needed. Therefore, it is more rational to stock up on a full set of them.
Recommendations for cleaning the jet
Most often, the injectors do not need to be removed for cleaning. It is enough to remove the burners. In some models, you will also have to remove the hob cover and other parts.
First, try cleaning the nozzle hole without dismantling it.
The nozzle hole is narrow, use fishing line, copper wire or needle to clean it.You just need to twist the needle around its axis with your fingers. After the needle has deepened, before removing it, turn on the gas supply and remove the needle. A jet of gas blows dust out of the hole. A few seconds will be enough for purging.
If cleaning is not possible on site, the nozzle should be removed, cleaned and rinsed. Reinstall after drying.
Instructions for replacing stove and oven jets
Next, we will consider detailed instructions on replacing nozzles on the stove and oven.
Instruction #1 - replacing hob nozzles
Read more about what to do and how to replace nozzles on a gas stove. Since gas stove designs vary, let's look at a few of the most typical options. In the designs of new modifications, access to the nozzles is easier (just remove the burners). Other common models are of interest.
In terms of burner design, some models of Hephaestus and Darina stoves are similar. To replace the nozzles of the cooking part of the Hephaestus stove, a series of steps are performed sequentially.
Step 1. Remove the grate from the stove and remove all burners.
Step 2. After unscrewing the fastening screws, remove (raise) the top panel. “Darina” has latches that are released with special stops from the stove set.
Step 3. To release the burner, use a Phillips screwdriver to unscrew the two screws securing its structure.
Step 4. Using a flat-head screwdriver, remove the retainer (the curved plate) from the side of the faucet handle, freeing the tube supplying gas to the burner. Take the tube to the side.
Step 5. Detach the second end of the tube from the seat by removing the fixing plate with your fingers or using pliers (in Hephaestus) / screwdrivers (in Darin).
Step 6. In the Hephaestus stove, the end of the gas tube is connected to the nozzle through a transition cone (a sealing ring is installed on the tube under the cone). Place a key (14) on the hexagonal pad of the cone in order to hold it and not damage the tube when unscrewing it; use a second key (8) to unscrew the nozzle.
Step 7. Having unscrewed the old nozzle, replace it with a new one, lubricating the threads with graphite lubricant. The sealing ring is also replaced, which is convenient to do with a match. Use a 7 key to tighten.
Step 8. Reassemble the entire assembly in reverse order.
A similar operation is performed for the remaining burners of the cooking table.
Taking advantage of the fact that the upper part of the unit is opened, it is cleaned of debris and dirt.In addition to replacing nozzles, screws in the plates can also be replaced to regulate low gas flow (or low flame). They regulate the reduced gas supply, sufficient to ensure that the flame on the burner does not go out with a minimum gas supply.
Having replaced the jets, check their operation; if necessary, adjust the small flame combustion process with screws.
After replacing the nozzles, adjusting the low flame and air supply, as well as cleaning the insides of the stove, reassemble the cooking part in the reverse order.
Instruction #2 - replacing oven jets
In the designs of different stove models, the number of burners and their location vary. So ovens can have one (bottom) or two (top for grilling and bottom) burners. In modern ovens, the burners are often oriented along the stove (lengthwise), and the jets are mounted on the back wall. On older stoves, the gas supply is on the left (side orientation), and the jets are also located on the left side of the oven.
In order to get to the nozzle of the upper burners, remove the door, unscrew and remove the grate covering the burner, and unscrew the screw securing the burner to the frame. By pulling the burner towards you, it is carefully removed from the oven, after which the nozzle becomes visible. On some models, the tip must be removed to remove the burner. thermocouples.
The nozzle is unscrewed using a socket wrench. After installing the new part, reassemble the oven equipment in the reverse order. If the nozzle cannot be unscrewed from this position without applying great force, then access it from the back side of the plate.
In some models, access to the lower burners is provided from the lower technical drawer. In others - from the oven chamber, such as in the MORA stove, the replacement of the nozzle of which is given as an illustration.
The burner is installed in a longitudinal position. Attached to the plate using a curved iron strip with two screws. A thermocouple is attached to the same strip.
The burner can only be removed after disconnecting the thermocouple tip. It is removed along with the iron strip.
The sequence for replacing the jet when the burner is positioned on the side may be more difficult.
Let's look at the step-by-step replacement instructions below:
Step 1. Open the bottom door of the stove drawer all the way, allowing you to fully open the oven door.
Step 2. Open the oven door all the way.To remove the burner, remove the floor of the oven chamber by pulling it towards you through the slot.
Step 3. Unscrew the two screws securing the burner. We remove the burner.
Step 4. Now we can see a nozzle on the left in the wall. It’s good if it’s not stuck and you don’t need to use a lot of force to unscrew it. If so, remove the jet and replace it at this stage.
Step 5. If the jet is stuck, then leave it. We dismantle the left wall of the slab. To do this, you will need to unscrew the fixing screws.
Step 6. Having removed the wall, we expose the gas line going to the burner. At the very bottom of the gas pipe there is a 17 nut, which can be unscrewed with a wrench without much difficulty.
Step 7. We move the gas pipe with the nut aside and disconnect the nozzle holder body from the stove.
Step 8. Lubricate the stuck nozzle with WD-40 or another suitable product, wait until it takes effect, and unscrew the nozzle.
Step 9. We install a new jet into the body and assemble all previously removed parts, not forgetting to install a new sealing ring.
Useful tips for replacing injectors
To check the serviceability of the stove and the absence of gas leaks, it is recommended to call gas service technicians. General cleaning of the stove is best done weekly. Cleaning the table after every meal.
Using excessive force can damage the gas tube or nozzle, which can result in more serious stove repairs or nozzle failure. Therefore, where there are special wrench areas, when unscrewing and tightening the nozzle, use two keys - one to hold the tube, the second to rotate the nozzle.
It is correct to check the shape and color of the flame on the burner of an oven equipped with a thermostat when the oven is cold. Otherwise, a thermostat intervenes in the process, reducing the gas supply when the temperature reaches a certain threshold. This is his purpose.
In old-style equipment, the air supply speed to the burner is additionally adjusted.
In new units, the nozzles are screwed in without winding the threads. In old gas structures, the last 3-4 thread steps are sealed with fibrous materials.
If seals are installed in the connections, it is better to replace the old rubber rings with new ones.
On the forums there are tips on changing the cross-section of the nozzle throughput hole by caulking or placing a wire in the hole. These are quite crude methods that are not recommended. None of these methods can accurately adjust the gas supply. It will also not be possible to drill a narrow hole with a thin drill. The best solution would be to buy a new jet with a hole of the required diameter.
Safety precautions when replacing an injector
Ensuring that replacement can be carried out safely is a critical requirement when performing gas-related activities.
Therefore, do not neglect a number of rules:
- Before replacing the jets, disconnect the stove from gas and electricity.
- Make sure the burners are cool.
- Before starting work, open windows and turn off electrical devices that may cause a spark.
- You cannot independently modify the parts of the plate or replace them with non-original ones, inappropriate in size, or made yourself.
- After installing the parts, be sure to check all gas connections for possible leaks. To do this, wash the compounds on all sides (using a brush or sponge) and, turning on the gas supply, observe whether bubbles form. If a leak is detected, the connection is either tightened or disassembled and reassembled.
You cannot use nozzles designed for gas burners of stoves of a completely different design or other gas devices.
You should not replace the nozzles in a gas stove yourself if you are unsure of your capabilities.
Conclusions and useful video on the topic
Home craftsmen have always preferred to do everything themselves. In the video you can see how the fixing elements were experimentally found and the nozzle was replaced in the MORA stove oven:
The nuances of cleaning the nozzle are in the following video:
Conversion of the Lada stove to bottled fuel:
Replacing such a seemingly small part, but necessary for proper operation of the stove, is not difficult for those who are used to working with their hands. Knowledge of how to properly change jets on an old gas stove, a minimum set of tools and spare parts, careful adherence to replacement rules - this will be enough for a successful business.
Are you familiar with the process of replacing jets firsthand? Tell us about your experience, share useful tips with other users, take part in discussions - the feedback form is located below.
