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Daewoo Matiz. There is steam coming out from under the cap of the expansion tank (white smoke)

Breakdown of the cylinder head gasket

The most common answer to such a problem is the cylinder head gasket (cylinder head) burnt out, if it is not difficult for you to disassemble the engine, the first thought would be to change this gasket. But imagine that there are two more reasons for the antifreeze to be squeezed out of the system.

1- This is an air plug in the coolant system, because of it not only the stove in the cabin may not work, but this is already a sign of a plug in the coolant - coolant, provided that your liquid level is normal, but the thermostat may not work correctly. Which can lead to an increase in pressure in the cooling system. Well, squeezing out antifreeze.

2- This is a problem associated with the expansion tank, well, and the smart lid of this tank.

To improve the circulation of coolant through the engine system, when the engine is started, a slight pressure is created by the pump, which increases the efficiency of the cooling system. If insufficient pressure is created in the coolant system, the engine will heat up faster. Which can lead to boiling or decomposition of antifreeze. When boiling, the decomposition of antifreeze vapors are looking for weak spots. Such as wooden rubber o-rings of the cooling system, bad pipes, the cap of the expansion tank or radiator is not tightened tightly.

The cylinder head is, of course, also not a secondary problem, but it is also quite possible to diagnose it, and as it turned out, it was very simple.

We start the engine, open the cover of the expansion tank, if on idling you see bubbles coming from the main hose, this is one of two things, either an air lock breaks, or a problem with the cylinder head gasket.

If this is an air lock, then after gasping and waiting for some time, you can get rid of it, the most effective procedure is very difficult to describe, since you need to carry out a series of sequential actions and it is better to show them on camera.

If there is no plug and there is a problem with the cylinder head, then you will have constant or weak seething in the expansion barrel or the antifreeze level will gradually go away.
If your coolant goes somewhere and there are no traces on the engine, then there may be coolant either in the cylinder or in the muffler, which also often happens. This indicates a problem with the cylinder head.

Expansion tank malfunctions

First, be sure to look at the smudges of antifreeze on the barrel, there are three problems with it:

1- the cover of the expansion tank (the cover gasket is hardened) allows air to pass through, there is also a deformation of the cover of the RB - the expansion tank - only a replacement for the original.

2- the expansion tank cap thread is broken, in this case a new cap will not help for a long time!

3- the expansion barrel has a leak or burst along the seam, which manifests itself from an increase in pressure in the engine coolant system, there are such cases that as internal combustion engine cooling the gap is joined and the coolant stops squeezing out.

4- air leak (sometimes, but rarely)

Most importantly, this is a visual inspection for both leaks and damage to the hoses.

Pay attention to the thread on which the tank cap was twisted.

It happens that if you tighten the cap, it gets crooked and the liquid easily comes out of the tank. If you look at the thread of the tank, it’s not really clear whether it’s whole or not, but if you highlight it on one side, it’s all torn off.

Other reasons

1. A white emulsion (foam) on the oil level dipstick or on the oil filler cap indicates that coolant has entered the lubrication system, most likely through a hole in the cylinder head gasket. Sometimes, though rarely, the gasket is safe and sound, and the leak is due to a crack in the block itself. But in any case, if there is a white emulsion in the lubrication system, you need to sound the alarm, or even better, pick up a tool and fix the problem.

2. White smoke from exhaust pipe when the engine is running, indicates that coolant has entered the engine cylinder(s). At the same time, its level decreases, since it partially “flies into the pipe”. The exhaust of a car can be white when the engine is warming up, there is a large amount of condensate and high humidity - this is not a malfunction, but if it always "smokes" a lot, it is worth considering.

3. Oil stains on the surface of the coolant in the expansion tank or in the radiator indicate the penetration of oil where it should not be.

The reason is most likely a faulty cylinder head gasket. It's worth at least checking it out.

4. Bubbles coming out through expansion tank or radiator indicate coolant intrusion exhaust gases. There is a hole somewhere, and most likely it is in the head gasket. A certain amount of bubbles may appear when replacing the coolant - this is normal, but if the antifreeze constantly "bubbles" - then something is wrong.

five . Clogged oil filler neck

6. Antifreeze goes out from under the exhaust manifold mounting studs

8. Water from the radiator enters the cylinder block - it is necessary to replace the radiator

Automobile Daewoo Matiz has a sufficiently small, and hence economical engine. But sometimes, in the stream it is necessary to step on the gas so as not to fall out of the general mass of motorists. To keep the engine in working condition, it is necessary to check its condition regularly. It is also important to periodically adjust the operation of the GDS system.

At what time is it desirable to adjust the valves on the Daewoo Matiz?

Each internal combustion engine requires adjustment of the clearances of this mechanism. Valve adjustment at Daewoo Matiz is recommended to be carried out every 20 thousand kilometers.

Experts talk about the following factors indicating the need to adjust the valves:

1. An expanded thermal gap will cause a decrease in lift height and flow area. In this regard, the engine receives less fuel and air.
2. On the contrary, a reduced thermal gap breaks the tightness of the valve seat in the seat. This can lead to burning of the chamfer of the part, which, in turn, will adversely affect the compression.
3. The cylinders began to be cleaned of gases worse, and the combustion process of the mixture became of poor quality if the gaps increased.

In the event that the dimensions specified by the technologists are violated in the timing system, the valve stems and the seats of the engine parts wear out. Carbon deposits and damage to parts with springs associated with it can lead to engine failure.

Signs that will help you understand that it is time to make an adjustment:

• Decreased engine power;
• A loud knock is heard in the timing area;
• Interruptions occur in the engine;
• Periodically there are pops at the inlet / outlet.

If, with these faults, you do not start repair work in the near future, this will cause serious monetary costs in the future.

So let's look at the adjustment procedure Daewoo valves Matiz.

Preparatory stage of work

It is important to know that you only need to adjust the valves with a cold engine.

The tools should include:

• Wrenches (they are open-ended) - a set;
• Screwdriver set;
• Socket set;
• Imbus keys (set);
• Measuring probes;
• Pliers.

To get to the valves, you need to do some preparatory work.

It is necessary to de-energize the battery, observing safety precautions. To do this, disconnect the negative wire from the battery.

To do this, we do the following:

1. The air duct is attached with a special clamp, loosen it with a flat screwdriver.
2. We take the filter pipe, which is air, and disconnect it from the air duct.
3. Remove the hose from the air filter housing.
4. If the engine of your car has a volume of 0.8 liters, then you need a harness block electronic system control of the internal combustion engine is separated from the temperature temperature.
5. The filter housing is attached to the air intake with three bolts. With a socket head on “10”, we turn them away.
6. Slightly raise the air intake and voice box, remove the pins from the special rubber pads.
7. Dismantle the assembly.

Now remove the ignition module.

Adjusting the valves on the Daewoo Matiz without this procedure is almost impossible.

By doing this, we do the following:

1. We find the fixer and wring it out from the block of the harness of the engine control system.
2. The coils are attached to the holder of the cylinder head cover, in order to remove them, you will need to unscrew the three bolts with the “tenth” socket head.
3. Remove the ignition module.
4. Now remove the throttle body.

This action is also carried out in several stages:

1. Disconnect the crankcase ventilation tube from the air duct tube.
2. Also, remove the hose leading to air filter, then remove the air duct.
3. It is required to disconnect all wires from the regulator idle move. This applies to a 0.8 liter Matiz engine.
4. At throttle valve there is a position sensor. We also disconnect the wires leading to it.
5. Antifreeze must be drained to the minimum mark.
6. On the hoses that supply coolant to the throttle block, it is necessary to compress the clamps with pliers and disconnect them.
7. The throttle body and intake manifold have four mounting bolts. They need to be unscrewed with a hex wrench.
8. Now we can remove the entire throttle assembly.

And the last thing to do right before the adjustment.

When the work is completed, remove the cover from the timing belt. To do this, you need to remove the front fender liner on the right and 4 mounting bolts.

Now there are a few more simple operations to be done:

1. A vacuum hose is extended to the vacuum booster. It is necessary, with the help of pliers, to clamp the clamp from the edges and move it along the hose.
2. Remove vacuum supply.
3. Remove the ventilation crankcase connection from the cylinder head cover fitting.
4. The screw of the inlet pipe holder must be unscrewed with a hexagon wrench to “5”.
5. It is necessary to compress the petals of the fixing element of the wires located in the control system power unit, using a screwdriver. Disconnect the harness from the holder.
6. With a “ten” socket head, unscrew the bolt that secures the connecting hose bracket and take it to the side.
7. Unscrew the bolts (8 pieces) that secure the cylinder head with the “fifth” hex wrench and disconnect it.

And now about the main thing: we normalize the valve clearances on the Daewoo Matiz

It is important to take into account the information that for intake valves, the clearance should be between 0.13-0.17 mm, and for exhaust 0.3-0.34 mm. In this space, with some effort, the probe should move.

Next, step by step proceed directly to the adjustment:

1. With the seventeenth end head, in the direction of the clock, turn crankshaft so that the mark on the pulley aligns with the “0” mark on the bottom of the timing belt cover.
2. In this position, the clearances of the intake / exhaust of the first cylinder, the intake of the second, and the exhaust system of the third cylinder are adjusted.
3. If you see that the dimensions do not match the ideal recommended by experts, you need to loosen the lock nut with the “12th” key.
4. The main thing is to simultaneously hold the adjustment screw with a slotted screwdriver.
5. We insert the probe into the gap and adjust the valve by unscrewing / tightening the adjusting screw until the required values ​​\u200b\u200bare obtained.
6. Next, tighten the control nut while holding the adjustment screw parallel with a screwdriver.
7. It is necessary, by turning the shaft, to achieve a match on the bottom cover camshaft, the blue mark converged with the "triangle" at the timing belt on the cover from below.
8. Now it is necessary to implement clearance regulation: the exhaust of the second and intake of the third cylinder, and the intake / exhaust of the 4th.

As soon as all the valves on the Matiz are adjusted, it is necessary to install all the constituent elements of the engine, in the opposite order from the disassembly.

Symptoms: knocks in the engine, the engine "troit".

Possible reason: the thermal clearances of the intake and exhaust valves are violated.

Instruments: a set of wrenches, a set of sockets, a flat blade screwdriver, a Phillips screwdriver, pliers.

Note. Checking and adjusting the thermal clearances in the valve drive should be done on a cold engine.

5. Slide the suction hose clamp from the exhaust pipe to the vacuum booster along the hose, squeezing the clamp with pliers.

6. Disconnect the vacuum supply hose from the connecting tube.

7. Disconnect the crankcase vent hose from the fitting on the cylinder head cover.

8. Loosen the fixing screw of the connection tube bracket and inlet piping using a 5mm Allen key.

9. Compress petals of the holder of a plait of wires of a control system of the engine, using a screw-driver.

10. Remove the engine management harness holder from the bracket.

11. Unscrew the fixing nut of the connecting tube bracket using the “10” socket.

12. Move the connecting tube aside.

Note. Do not disconnect the hose from the connecting tube vacuum booster brakes.

13. Turn off eight fixing screws of a cover of a head of the block of cylinders.

14. Remove the cylinder head cover.

15. Remove the mudguard located in the arch of the right front wheel.

16. Turn the crankshaft clockwise until the notch mark located on the crankshaft pulley aligns with the number "0" located on the bottom cover of the timing belt. Pay attention to the mark on the camshaft pulley: it should be located opposite the mark on the rear timing belt cover (use the “17” head).

Note. In this position of the crankshaft, only the intake and exhaust valves of the first cylinder, the intake valve of the second cylinder, and the exhaust valve of the third cylinder are adjusted.

17. Check the thermal gap between the valve stem and the adjusting screw using a flat feeler gauge (the feeler should move in the gap with little effort; the gap should be: 0.13-0.17 mm - for intake valves; 0.30-0.34 millimeters for exhaust valves).

Note. Follow the instructions below if the gap dimensions exceed the maximum allowable values.

18. Slightly loosen the lock nut using a 12 wrench (do not turn the adjusting screw by holding the screw with a slotted screwdriver).

19. Insert a feeler gauge between the valve stem and the adjusting screw, and then turn the screw with a screwdriver until the gap takes on dimensional values ​​(see item 17).