DIY glow plug repair

Repair of glow plugs consists in removing carbon deposits by sandblasting on a GARO-514-2M device.

A two-wire candle is checked for insulation strength between the core and the body. The test is carried out with an alternating current of 220 V. The dielectric strength is sufficient if the lamp does not light up after 2 seconds of the test.

If the spiral is not damaged, the absence of a short circuit between the core and the central rod is checked by measuring the ohmic resistance of the candle with a voltmeter and an ammeter, which should be within 0.03 ohms. The maximum current passed through the glow plug should not exceed 50 A. Two-wire plugs with faulty insulation are discarded, the burned-out spiral of a two-wire plug is replaced.

For this, the remnants of the burnt spiral are removed, holes with a diameter of 2.1 mm are drilled in the middle of the central rod and the end of the core to a depth of 5-6 mm. When repairing glow plugs, another 3 mm hole is drilled on the side of the core so that it connects with the previously drilled hole (2.1 mm diameter).

A spiral is made of nichrome wire with a diameter of 2 mm. The length and diameter of the wire of the filament is chosen depending on the value of the electrical resistance of the wire.

During the repair of glow plugs, the ends of the spiral are inserted into the holes of the plug and soldered with copper with a gas welding torch. Soldering is done at the end of the rod and the core, as well as through the side hole of the core.

The presence of a short circuit in a single-wire candle is detected in the same way as in a two-wire. The ohmic resistance of a single-wire candle when tested under a current of 24-30 A should be in the range of 0.4-0.5 ohms.

Defective insulation (mikanit) is replaced; for which the nuts are unscrewed, the lower end of the spiral is soldered off from the central rod and the core is removed from the body. The spiral of a single-wire candle is replaced in the same way as a two-wire one.

After replacing damaged parts, the starting glow plugs are again checked for short circuit and compliance of the ohmic resistance of the spirals with the technical conditions.

The last step in repairing glow plugs is to check for leaks with a tool at an air pressure of 2 MPa. Holding time under pressure not less than 30 s; no air leakage is allowed.

He took off the collector, began to deal with the candles and saw that:

1) on one candle the nut is unscrewed and fell off, the terminal hangs nearby
2) the terminal on the wire of the spark plug of the first cylinder is torn off
3) the rest of the nuts are loosened to varying degrees

Since I previously noticed that all the candles are working and uniform heating is visually visible, and the engine started up much better, I can conclude that the nuts were unscrewed during operation and a significant role in this was played by the solarium, which flowed in abundance from under the nozzles. time - until I bought a hose of the required diameter and fixed all the leaks. All nuts in traces of diesel fuel vapor. Apparently, I missed the first cylinder - the candle could not work in it, the wire was torn off - and I saw it, I just could not understand where it came from. After removing the collector, I saw an unused candle and drew attention to it.

All candles show resistance 0.3-0.4 ohms, taking into account the tester's error. All wires ring and show 0 ohms.

I tried it already 2 times, however, in the garage - when the thermometer was +15 after warming up the garage and after downtime, when it showed +5 (on the street at that moment it was -7).It actually starts up with a half-turn - it was not like that before, at first the shaking and contractions with one cylinder began - this lasted for a different length of time, depending on the air temperature around.

At the same time, I restored the insulation of the wiring harness, the insulation of the sensors, eliminated twists, soldered the contacts, put on heat shrinkage. In the process - setting the injection advance angle of the high-pressure fuel pump and checking the valve timing.

Glow plugs sometimes fail, while knocking out an error on the instrument panel. After diagnosing and replacing the spark plug, the error periodically appears anyway, despite a properly working system. This is possible with different resistance values ​​for the new candle and all the others. In this case, it is recommended to change the candles (if there are five of them, then it turns out a little expensive). But you can try to restore the candle. In my experience, about 90 percent of faulty plugs will lie down for restoration.

The glow plug itself is not much different from the shades used in electric kettles, toasters and similar electrical devices. The disadvantage of these things is that the heating coil must somehow be attached to the contacts. And it is a very common phenomenon when, due to numerous heating-cooling cycles, the contact point is simply oxidized or covered with carbon deposits. Everything would be fine, but the candle is not collapsible and we cannot clean the place of contact. But. You can try to burn this carbon deposit with a good arc (as in welding). So. In order to restore the candle, you need to collect the following scheme:

With a SHORT-TERM touch of the body (where the minus is in the figure), the circuit will close and if you see a spark at the point of contact - congratulations, we have a whole candle.

If you did not see a spark (i.e. the current does not flow through the circuit), try a couple more times and if there is no result, the candle is irreversibly faulty. (but this is rare)

Many car enthusiasts are interested in how to unscrew a broken glow plug. Quite often, drivers break off this detail. There may be several reasons for such a breakdown. Sometimes, the problem lies in the candles themselves, in other cases, it is the unsuccessful actions of the person himself. As a rule, drivers with such a failure begin to panic, assuming that they will need to remove the head, or go to an official service, which will result in a certain amount. But, in fact, life should be treated more simply. Usually you can get off with a little blood, and unscrew the candle yourself, though you have to tinker.

How to unscrew a broken glow plug? If a person has such a question, and he began to look for information on this topic, then it makes sense to figure out what is not worth doing. After all, not all advice is useful. Most often, you can read about dissolving a candle in acid. It's hard to come up with more nonsense. Please note that the screwed part of the spark plug, like the engine, is made of metal. Yes, the skirt of a glow plug is made of soft metal, but a concentrated acid solution is required to dissolve it. Using it, you are guaranteed to damage the cylinder head. That is, using this advice, you will definitely get to replace the cylinder head, moreover, this is at best.

There are 2 ways to fix this problem:

• Complete disassembly of the engine;
• Unscrewing the remainder of the candle using a special tool.

The first method requires quite serious knowledge and skills in repairing motors, in addition to this, it is laborious. The second method seems easy at first glance, but in practice it is also quite complicated, for this you will need to acquire a tool and learn to work with it correctly.

To dismantle a candle, you will need a whole set of tools that are not always available in the garage. This includes:
Dynamometer wrench;
Compressor or any other source of compressed air;
Extractor keys. They are used to remove broken fasteners, usually similar to borax. You will have to buy a whole set;
Liquid wrench, WD-40 or any other penetrating lubricant.

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Here is such a rather large list you will need to prepare before starting the repair.

After you have managed to unscrew the candle, you will need to check the threads in the well. It must be free from damage and burrs. In principle, if you did everything carefully, then there should be no problems. Do not forget to blow out the cylinder from dust and small particles formed during the unscrewing process. When installing the replacement part, be sure to use a torque wrench and tighten it to the manufacturer's recommended torque.

Conclusion... The problem with a broken-off glow plug on a diesel engine is not such a rare thing. Therefore, many would be interested to know how to unscrew a broken glow plug. In fact, if you have straight arms, you can do this without any problems. Although, in any case, you will have to tinker, nevertheless the engine requires special attention. To work, you will need to purchase special keys.

REPLACING DIESEL CANDLES

In the lineup of almost all leading auto manufacturers, models equipped with diesel engines are widely represented. A key feature of a diesel engine is that no spark is required to ignite the fuel in its combustion chamber.

In this case, the fuel is supplied to the chamber, the air of which has already been heated to a temperature of more than 700 degrees due to its compression by the piston. This temperature is sufficient for self-ignition. Therefore, glow plugs are used in diesel engines.

The glow plug is used as a priming element. The fact is that at temperatures below +5 degrees, the evaporation of diesel fuel significantly deteriorates, which makes it difficult to form a mixture and start the engine. The filament element solves this problem by providing sufficient preheating.

Therefore, replacement of the glow plugs in the event of a failure should be carried out as soon as possible. This is especially true in the winter, when the car owner may face serious difficulties when starting the engine. Therefore, do not delay replacing the glow plugs on a diesel engine.

Removing broken glow plugs

It often happens that such a simple procedure as replacing the diesel glow plugs in the engine turns into a lot of problems. And this happens in those cases when the candle sticks to the block head so much that it is no longer possible to unscrew the glow plug from there. The glow plug is broken - one of the reasons is coke, which clogs up in the well under the candle. Then it is very difficult to turn out the broken glow plug.

Broken glow plugs - the main reasons are:

• The spark plug torque has been exceeded;

• Great effort when trying to unscrew the glow plugs from the block head;

• Violations committed during the previous installation of the spark plugs.

Sometimes, self-replacement of candles by a car owner often leads to the fact that he broke the glow plug with his own hand. How can you unscrew (drill out) broken glow plugs without damaging the block head? We know how to remove the glow plugs without removing the cylinder head and keep the engine running.

We carry out works with departure (and without) in Moscow and M.O .:

• Removing broken off glow plugs without removing the cylinder head;

• We will be able to extract the glow plugs if they break off in the head;

• Take out a piece of the electrode from the plug from the head without removing it;

• Replacement of broken glow plugs;

• Drilling (unscrewing) broken off glow plugs;

• Take out the fragment (tip) of the glow plug;

How to unscrew a broken glow plug? Proven methods

How to unscrew a broken glow plug? If a person has such a question, and he began to look for information on this topic, then it makes sense to figure out what is not worth doing. After all, not all advice is useful. Most often, you can read about dissolving a candle in acid. It's hard to come up with more nonsense. Please note that the screwed part of the spark plug, like the engine, is made of metal.Yes, the skirt of a glow plug is made of soft metal, but a concentrated acid solution is required to dissolve it. Using it, you are guaranteed to damage the cylinder head. That is, using this advice, you will definitely get to replace the cylinder head, moreover, this is at best.

There may be several reasons for this. Let's see what causes you to end up with a broken candle:

Design features. Many glow plug models have multiple parts. The base is a threaded rod, a cylinder in the form of a nut is attached to it, it is with its help that the part is unscrewed. But, often, this cylinder simply breaks off the mountings, as a result of which, it begins to spin freely. Or just breaks off;

"10 years without overhaul". Glow plugs are reliable enough, so you can often find foreign cars 10-20 years old, where this structural element has never been removed. Accordingly, they stick to the threads, soot collects on them. All this leads to problems when unscrewing, and, accordingly, breaking it off right on the engine. Natural "metal fatigue" is also affected here;

Often the drivers themselves are to blame for what happened. It is believed that it is easier to remove plugs on a hot engine, but at the same time they forget about reducing the strength of the plug itself. As a result, a spare part is broken.

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