28.11.2021

Checking and adjusting thermal clearances on the engine. Adjusting the valves of Daewoo Matiz Adjusting the valves of Daewoo Matiz 0.8

Before adjusting the thermal clearances on the valves, you need to get to them. Disassembly begins with removing the ignition coil unit and throttle assembly.

To dismantle ignition coil block , first you have to move the rubber protective caps from its terminals, and then disconnect the tips of the spark plug high-voltage wires. Then, using a 10mm head, using an extension, you need to unscrew the three mounting bolts securing the coil block to the cylinder head cover bracket. The block can be removed.

To remove throttle assembly on Daewoo Matiz 1.0 l, you must first disconnect the wire terminal on battery. Use a slotted screwdriver to loosen the tightening of two clamps securing the air duct with the nozzles of the throttle assembly and the housing cover air filter. Next, remove the air duct from the filter cover and throttle body pipes and move the air duct to the side. Disconnect the drive cable throttle valve from the drive sector.

Now you need to disconnect the block in which the wires are placed from the throttle assembly connector. To do this, you just need to press on the pad lock located below. Next, unscrew two nuts (10mm wrench) on the upper mount of the throttle assembly. You can now remove the cable bracket to the throttle valve drive from the intake manifold studs.

To complete it, unscrew two screws (hexagon “5”) holding the lower mount of the throttle assembly. The throttle assembly moves from the studs. The adsorber purge hose is disconnected from the fitting on the throttle body and the throttle assembly itself is removed. Don’t forget to remove the gasket on the throttle body flange. Please note that in the Daewoo Matiz 0.8 liter the throttle assembly is removed a little differently.

After removing the throttle assembly, the dismantling queue was established timing belt top cover . Using pliers, squeezing the ends of the clamp securing the vacuum brake booster with the vacuum supply hose from the intake manifold to the vacuum brake booster, slide the clamp along the hose. Now you can remove the vacuum supply hose from the connecting tube. Next, remove the crankcase ventilation hose from the fitting of the cylinder head cover. Use a 5mm hex to unscrew the screw securing the intake pipe to the connecting tube bracket.

In the next step, disconnect the wiring harness holder from the bracket. To do this, just squeeze the petals of the wire holder going to the engine control system with a screwdriver. We unscrew the fastening of the connecting tube bracket with the head “10”. We move the connecting tube to the side without disconnecting the brake booster hose from it. Unscrew the eight screws securing the cylinder head cover using a 5mm hexagon. Now you can remove the cylinder head cover.

Filming mudguard , connected to the right front wheel arch. To do this, dismantle the right front wheel. From the bottom of the car, using a Phillips screwdriver through the hole in the front subframe, unscrew the screw for the lower fastening of the shield. Using a 10mm socket, unscrew the nuts of the upper and front fastenings of the shield. That's it - the mudguard is released.

Adjustment of thermal gaps.

After removing the shield on the Daewoo Matiz 1.0, it is already possible to adjust the thermal gaps. To do this, the piston of the first cylinder is installed at TDC at the end of the compression stroke. To achieve this, turn the crankshaft clockwise (with the head at “17”) by the pulley mounting bolt until the mark in the form of a cutout on the crankshaft pulley aligns with the number “0” on the lower timing belt cover. You need to make sure that the mark on the toothed pulley camshaft was placed opposite the triangle-shaped mark on the rear timing belt cover. Having achieved this position of the crankshaft, you can already inspect and adjust the valve clearances in the following order:

Intake and exhaust valves of the first cylinder;

Intake valve of the second cylinder;

Exhaust valve of the third cylinder.

Using a flat feeler gauge, check the thermal gap between the valve stem and the adjusting screw. With all this, the probe should move in the gap with little effort. The gap size must be within the permissible limits of 0.32 ± 0.02 mm for exhaust valves and 0.15 ± 0.02 mm for intake valves.

If the value of the thermal gap does not coincide with the permissible values, then loosen the locknut using a “12” wrench, while holding the adjusting screw from turning. It is most convenient to hold the screw with a slotted screwdriver. To achieve the required clearance, you need to insert a feeler gauge between the adjusting screw and the valve stem, and then turn the screw with a screwdriver to the appropriate values. After that, we tighten the locknut, while holding the adjusting screw with a screwdriver. At the end of the adjustment, you need to recheck all the gaps again.

We continue with the adjustment. Rotate the crankshaft 360° clockwise. In this case, the blue mark of the camshaft pulley should be located opposite the triangular mark on the rear timing belt cover. In this position of the crankshaft, we check and, as necessary, adjust the clearances of the subsequent valves:

Exhaust second cylinder;

Intake third cylinder;

Intake and exhaust 4th cylinder.

After completing the adjustment of the thermal valve clearances on the Daewoo Matiz 1.0 l, all removed components and parts are installed in the reverse order.

Adjusting Daewoo Matiz valves is quite a troublesome and difficult task. You need to have not only special tools, but also know what the valve clearances should be, and also be able to adjust them. Regulations technical work Maintenance of the Matiz internal combustion engine provides for such events every 20,000 km.

According to experts, adjustment of Daewoo Matiz valves is necessary for the following reasons:

the increased thermal gap causes a decrease in the lift height, and, therefore, the flow area, as a result of which the quality of filling the cylinder with a combustible mixture or air decreases;
the reduced gap contributes to the violation of the tightness of the valve seat in the seat, which directly affects the compression and causes the chamfer of the part to burn;
An increase in the gap in the mechanisms leads to a deterioration in the cleaning of gases from the cylinders and makes the combustion process of the mixture incomplete.

Violation of technological dimensions in timing mechanisms leads to wear of valve stems and seats of parts. Carbon deposits and associated malfunctions of spring structures lead to disruption of the operating cycle of the power plant.

The presence of the following signs will help determine the moment when adjustment of the Daewoo Matiz valves is necessary:

power drop;
loud knocking in the timing belt area;
interruptions in internal combustion engine operation;
periodic popping noises in the intake or exhaust tract.

The presence of the listed symptoms requires immediate intervention, otherwise, breakdowns associated with the replacement of timing belt units will require significant financial investments.

Preparatory work for adjusting Daewoo Matiz valves

First of all, you need to remember that all adjustment work is performed on a cold engine. Now we complete the set of necessary tools:

set of open-end wrenches;
screwdriver set;
set of heads;
pliers;
set of imbus keys;
set of measuring probes.

The procedure for adjusting the gaps requires a number of preparatory measures, because it will not be possible to get to the timing components so easily. First of all, you should disconnect the negative cable of the battery.

Read also: Replacing spark plugs on Lada Granta 16 valves

Removing the air filter housing

The process consists of several transitions:

Using a flathead screwdriver, loosen the air duct clamp.
Disconnect the filter pipe from the air duct.
For the Matiz 0.8 l internal combustion engine, disconnect the harness block of the engine control system and the air temperature sensor, remove the hose from the filter housing.
Using a 10mm socket, unscrew the three bolts securing the filter housing to the air intake and remove them.
Lift the housing with the air intake and resonator and remove the two pins from the rubber pads.
Dismantle the unit.

Removing the ignition coil block

The following procedure, without which adjusting the Daewoo Matiz valves is impossible, is performed according to the scheme:

Release the clamp of the engine control system harness block.
Remove the block from the ignition coil assembly.
Slide the rubber caps off the terminals of the coil block and disconnect the high voltage wires.
Using a 10" socket, unscrew the three bolts securing the coils and the cylinder head cover bracket.
Remove the ignition coil assembly.

Removing the throttle assembly

The technological map of this process includes the following work:

Disconnect the crankcase vent pipe from the air duct connection.
Disconnect the hose from the air filter housing and remove the air duct.
Disconnect the wire terminals from the XX regulator (for the Matiz 0.8 l internal combustion engine).
Disconnect the wires from the throttle position sensor.
From expansion tank drain the antifreeze to the “Min” mark.
Using pliers, compress the clamps of the coolant supply hoses to the throttle body pipes and disconnect them.
Using a hexagon, remove the four mounting bolts for the throttle body and intake manifold.
Remove the throttle assembly assembly.

Final preparations for adjusting Daewoo Matiz valves

After implementing the steps described above, you need to remove the upper timing belt drive cover. To do this, remove the fender liner from the right front wheel arch and unscrew the four bolts securing the cover with a “10” wrench.

Before directly adjusting the Daewoo Matiz valves, there are a few simple technological operations left to do:

Using pliers, compress the edges of the hose clamp for supplying vacuum to the vacuum booster and slide it further along the hose.
Remove the vacuum hose.
Remove the crankcase ventilation hose from the cylinder head cover fitting.
Using a hexagon to “5”, unscrew the screw of the intake manifold bracket.
Squeeze the tabs of the engine control system wire clamp with a screwdriver and disconnect the harness from the bracket.
Unscrew the connecting pipe bracket mounting bolt with a “10” head and move it to the side.
Unscrew the 8 bolts securing the cylinder head cover using a hexagon to “5” and dismantle it.

How to adjust Daewoo Matiz valves

Let’s first find out what intake valves the gap is 0.13-0.17 mm, and for exhaust - 0.3-0.34 mm. A feeler gauge of the required size should move in the gap with little force. Now you can begin adjustment work in stages:

Using the head at “17”, turn the crankshaft clockwise until the mark on the pulley coincides with the number “0” on the bottom cover drive belt Timing belt
In this position, the clearances of the intake and exhaust mechanisms of the 1st cylinder, as well as the 2nd intake and 3rd exhaust cylinders are adjusted.
In case of deviations from the recommended dimensions, loosen the locknut with a wrench set to “12” while holding the adjusting screw with a slotted screwdriver.
Insert the feeler gauge into the gap and adjust the engine valve mechanism by tightening/unscrewing the adjusting screw with a screwdriver until the required dimensional values are obtained. After this, tighten the lock nut, holding the screw with a screwdriver from turning.
Rotate the shaft 360° so that the blue mark on the camshaft pulley aligns with the triangular mark on the lower timing belt cover.
Check and adjust the clearances of the following valve mechanisms: 2nd exhaust and 3rd intake cylinders, as well as 4th intake and exhaust cylinders.

After completing the adjustment work, all dismantled components and assemblies are installed in the reverse order.

Symptoms: knocking in the engine, the engine is “troubling”.

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

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

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

5. Slide the mounting clamp of the vacuum supply hose 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 venting hose from the fitting on the cylinder head cover.

8. Unscrew the mounting screw of the connecting tube and inlet pipe bracket using a 5-point hexagon.

9. Squeeze the engine management harness retainer tabs using a screwdriver.

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

11. Unscrew the fastening nut of the connecting tube bracket using a 10mm socket.

12. Move the connecting tube aside.

Note. Do not disconnect the brake booster hose from the connecting tube.

13. Unscrew the eight cylinder head cover mounting screws.

14. Remove the cylinder head cover.

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

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

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 gauge should move in the gap with little effort; the gap should be: 0.13–0.17 millimeters for intake valves; 0.30–0.34 millimeters - for exhaust valves).

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

18. Slightly loosen the locknut using a 12mm wrench (do not allow the adjusting screw to turn; to do this, hold the screw with a slotted screwdriver).

19. Insert the feeler gauge between the valve stem and the adjusting screw, then rotate the screw with a screwdriver until the gap reaches the dimensional values (see point 17).

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Daewoo Matiz. Steam is coming from under the expansion tank cap (white smoke)

Cylinder head gasket failure

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

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

2- This is a problem related to the expansion tank, and the smart cap of this tank.

To improve coolant circulation throughout the engine system, when starting the engine, a small 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 antifreeze boils and decomposes, vapors are looked for weak points. Such as wooden rubber o-rings of the cooling system, bad pipes, a cap that is not tightened tightly on the expansion tank or radiator.

The cylinder head is, of course, also not a minor problem, but it can also be diagnosed and, as it turned out, very simple.

Start the engine, open the expansion tank cap, if idle speed you can see bubbles coming from the main hose, this is one of two things: either the air cap is broken, or there is a problem with the cylinder head gasket.

If this is an air lock, then by extinguishing 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 the problem is with the cylinder head, then you will have constant or weak bubbling in the expansion barrel or the antifreeze level will gradually drop.
If your coolant is leaking somewhere and there are no traces on the engine, then the coolant may end up 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 for antifreeze leaks down the barrel; there are three problems with it:

1- the cap of the expansion tank (the cap gasket is stuck) allows air to pass through, and the cap of the expansion tank can also become deformed - only replace it with the original.

2- the thread of the expansion tank cap has been torn off, in which case a new cap will not help for a long time!

3 - the expansion barrel has a leak or has burst at the seam, which manifests itself due to an increase in pressure in the engine coolant system; there are cases that as the internal combustion engine cools, the gap closes and the coolant stops squeezing out.

4- air leak (occurs, but rarely)

The most important thing is a visual inspection for leaks and damage to the hoses.

Pay attention to the thread through which the tank cap is screwed on.

It happens that if you tighten the cap, it becomes 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 intact or not, but if you illuminate it, it turns out that on one side it’s all torn off.

Other reasons

1. 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 intact and undamaged, and the leak occurs 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, it indicates penetration of coolant into the engine cylinder(s). At the same time, its level decreases, since it partially “flies into the pipe.” The car exhaust may be white when the engine warms up, there is a lot of condensation and high air humidity - this is not a malfunction, but if it always “smoke” a lot - it’s worth thinking about.

3. Oil spots on the surface of the coolant in the expansion tank or in the radiator indicate oil penetration where it is not supposed to be.

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

4. Bubbles coming out through expansion tank or radiator indicate penetration of coolant 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 is constantly “bubbly”, then something is wrong.

5. The oil filler neck is clogged

6. Antifreeze leaves under the exhaust manifold mounting studs

8. Water from the radiator enters the cylinder block - the radiator needs to be replaced

Compact subcompact Daewoo Matiz cars are known primarily for their efficiency, which means low operating costs. But in order for the technical potential of the machine to remain at the proper level, it is necessary to periodically inspect and adjust the settings of the GDS mechanisms.

When is valve adjustment needed on a Daewoo Matiz car and why?

Almost any engine, after a certain number of engine hours or kilometers traveled, requires adjustment of the clearances between the rocker arm and the valve stem. The maintenance schedule for the Matiz internal combustion engine provides for such activities to be carried out every 20,000 km.

According to experts, valve adjustment is Daewoo Matiz necessary due to the following factors:

the increased thermal gap causes a decrease in the lift height, and hence the flow area, as a result of which the quality of filling the cylinder with a combustible mixture or air decreases;
the reduced gap contributes to the violation of the tightness of the valve seat in the seat, which directly affects the compression and causes the chamfer of the part to burn;
An increase in the gap in the mechanisms leads to a deterioration in the cleaning of gases from the cylinders and makes the combustion process of the mixture incomplete.

Determine the moment when valve adjustment is necessary Daewoo car Matiz will be helped by the presence of the following signs:

power drop;
loud knocking in the timing belt area;
interruptions in the operation of the internal combustion engine;
periodic popping noises in the intake or exhaust tract.

The presence of the listed symptoms requires immediate intervention, otherwise breakdowns associated with replacing timing belt units will require significant financial investments.