Adjusting the matiz valve, possible problems and solutions

Home Ravon matiz Adjusting the matiz valve, possible problems and solutions

• Ravon matiz

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• What are engine valves and why should you adjust them?
• When to adjust valves
• Preparing for adjustment
• How to adjust valves

Valves in the engine of any car need to be adjusted and Daewoo Matiz is no exception. On any engine, this process has its own characteristics and difficulties. Fortunately, on the standard 0.8 Matiz engine everything is done quite easily and you can do it on your own.

Check and adjust valve clearance in the following order:

— remove the air filter housing and the resonator;

— Unscrew the hex bolts securing the cylinder head cover and remove the cover;

Setting the piston of the first cylinder to TDC during the compression stroke

- Turn the crankshaft until the piston of the first cylinder is at top dead center (TDC) on the compression stroke. In this position, mark “a” on the camshaft pulley should align with the triangular indicator “b” on the rear timing belt guard, and mark “c” on the crankshaft pulley should align with indicator “d” on the oil pump housing;

Location for measuring the thermal clearance “a” of valves

— check the thermal clearance of valves “a” in the position of the piston of the first cylinder at TDC during the compression stroke of the intake valves of cylinders 1 and 2 and exhaust valves of cylinders 1 and 3;

Setting the piston of the first cylinder to TDC during the exhaust stroke

— rotate the crankshaft 360° (1 revolution), while the piston of the first cylinder is set to the TDC position of the first cylinder during the exhaust stroke, and the mark “a” on the camshaft pulley should align with the pointer “b” on the rear toothed belt casing;

— in this position, check the thermal clearance “a” of the valves of the intake valve of cylinder 3 and the exhaust valve of cylinder 2;

Using a feeler gauge (1) to measure valve clearance

— check the thermal clearance of the valves with a feeler gauge. The measured value of the thermal gap must correspond to that specified in the Technical Data, otherwise it is necessary to adjust the thermal gap.

Location of the locknut (1) and adjusting screw (2) for adjusting the thermal clearance of the valves

When adjusting the thermal gap, loosen lock nut 1 and then tighten or loosen adjusting screw 2 accordingly.

Note! If measuring the thermal gap with a hot engine, warm up the engine until the electric radiator fan starts working, then turn off the engine and measure the thermal gap 20-30 minutes later.

Now remove the ignition module.

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

By doing this we do the following:

1. We find the fastener and press it away from the engine control system harness block.
2. The coils are attached to the cylinder head cover holder; to remove them, you will need to unscrew three bolts with a “tenth” socket head.
3. Remove the ignition module.
4. Now remove the throttle assembly.

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 the air filter, and then remove the air duct.
3. It is necessary to disconnect all wires from the idle air control regulator. This applies to the 0.8 liter Matiz engine.
4. The throttle valve has 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 using a hex key.
8. Now we can remove the entire throttle assembly.

One last thing to do right before making adjustments.

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

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

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

Valve adjustment Daewoo Matiz 0.8

, thermal valve clearances on Daewoo Matiz 0.8 must be checked every 30,000 km , and if there is a violation, adjustments must be made on at least one cylinder. the cylinder head has been repaired or gas equipment is installed on the car.

In this photo report we will show how to quickly and without removing the timing case adjust the thermal valve clearances on a 0.8 liter Daewoo Matiz .

What should be the valve clearances on Matiz 0.8?

If the car runs on gasoline, the valve clearances should be:

• 0.15 mm at the inlet;
• 0.30 mm at outlet.

If the vehicle is equipped with an LPG system , then the gaps must be increased by 0.05 mm .

Tools and materials for adjusting valves

• Jack;
• Open-end wrench 10 mm ;
• Ratchet with 10 mm ;
• Screwdriver «-«;
• 5 mm hexagon ;
• Sealant REINZOSIL +300 Victor Reinz article 70-31414-10;
• Sandpaper or knife;
• Clean rags.

Preparatory stage of work

It is important to know that valves need to be adjusted only with a cold engine.

The tools should include:

• Wrenches (also known as open-end wrenches) - set;
• Screwdriver set;
• Set of socket heads;
• Imbus keys (set);
• Test leads;
• Pliers.

To get to the valves, some preparatory work needs to be done.

It is necessary to disconnect 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 secured with a special clamp, loosen it with a flat screwdriver.
2. We take the filter pipe, which is the air one, and disconnect it from the air duct.
3. Remove the hose from the air filter housing.
4. If your car’s engine has a volume of 0.8 liters, then you need to separate the harness block of the electronic internal combustion engine control system from the temperature temperature.
5. The filter housing is attached to the air intake with three bolts. Use a socket head to “10” to unscrew them.
6. We slightly raise the air intake and voice box and remove the pins from the special rubber pads.
7. Dismantle the unit.

How are valves adjusted on Matiz?

1. Turn off the gas injectors and move them to the side;
2. Remove the ignition coil;
3. Unscrew and remove the valve cover;
4. Jack up the front right wheel;
5. We install the engine in fifth gear;
6. We adjust all the valves by turning the engine by the wheel;
7. After adjustment, clean the seat on the cylinder head ;
8. Reinstall the valve cover;
9. We connect back everything that was previously disconnected.

The procedure for adjusting the valves of Matiz 0.8

adjust the valves on the Daewoo Matiz in two stages.

• We set the engine according to the marks. The piston of the first cylinder should be at top dead center.
• We adjust the two valves of the first cylinder (intake and exhaust). We adjust the gaps on the intake valve of the second cylinder. We adjust the exhaust valve of the third cylinder.

• Turn the engine clockwise. The crankshaft must make a full rotation (360°) . The camshaft rotates 180° .
• We adjust the clearances on the exhaust valve of the second cylinder and on the intake valve of the third cylinder.

Final preparations

implementation After the points 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 fastening cover bolts with a 10mm wrench.

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

1. Using edge pliers, compress the clamp of the vacuum supply hose to the vacuum booster and slide it further along the hose.
2. hose Remove vacuum.
3. Remove the ventilation hose from the cylinder head cover housing.
4. Using a hexagon, unscrew the intake manifold bracket screw to “5”.
5. petals Squeeze the wire clamp of the engine control system with a screwdriver and disconnect the harness from the bracket.
6. Unscrew the bolt at “10” with the head securing the connecting pipe bracket and move its side away.
7. Unscrew the 8 bolts securing the cylinder head cover using a hexagon to “5” and dismantle it.

Why adjust valves on Daewoo Matiz

The valves in the cylinder head are required to tightly close the combustion chamber during the compression stroke. However, this does not always happen. In the case when at least one of the valves, intake or exhaust, performs its job carelessly, the edge of the valve does not fit tightly to the seat, and gases heated to enormous temperatures break through either into the intake or exhaust manifold.

This threatens, at a minimum, loss of compression and deterioration in filling the cylinders with the fuel-air mixture. Which in turn causes a drop in power, complicates starting and negatively affects fuel consumption. But that's not all. Hot gases tend to destroy the edge first, and then, after microcracks appear, cause complete destruction of the working part of the valve.

How to know when it's time to adjust the valves

In addition to the manufacturer’s recommendation that the gaps are adjusted every 20,000 km , there are a number of signs that directly indicate the need for adjustment. It is logical that adjustment is needed in the case when the cylinder head was repaired. There are a number of other symptoms:

1. A characteristic clicking, chattering sound coming from under the hood . An experienced mechanic can easily determine just by sound that the valves need adjustment.
2. Gradual decrease in power . The thermal gap is not lost instantly. Therefore, determining the loss of traction and dynamics can sometimes be difficult. However, if the power drops critically against the background of other symptoms, we can talk about a loss of nominal valve clearances.
3. Engine overheating . Since some of the hot gases enter the manifolds, the engine can become very hot even at low loads.
4. As you gain speed, you may experience noticeable popping noises both at the intake and exhaust.
5. Incorrect engine operation , difficult starting, unstable idle speed.

If you have even these symptoms, you should already think about checking the valve clearances.

What is needed to adjust the gap

The tools you will need are a set of bits, sockets, wrenches, extensions and cardans, and a set of screwdrivers. You also need two probes for 0.15 mm and 0.32 mm. Since it is difficult to find a 0.32 probe, we will use two probes - 0.3 and 0.02 mm together. If the valve cover is secured with factory bolts, a 5mm hex is required.

This set of probes is enough for any adjustment

By the way, about the valve cover bolts (M6x1, length 35 mm) . They are extremely unreliable, and the manufacturer recommends replacing them every time the cover is removed. The fact is that the hexagonal hole often licks off when reused. So, if they are on sale, it is better to buy new original ones.

The catalog number of the original bolt is 94500741-GM, their price is about 15 hryvnia per piece. As a last resort, you can use camshaft bed bolts from VAZ 2110-2112, but using regular hex head bolts is highly undesirable.

Many would be happy to save on the valve cover gasket. It is also disposable, even if it still looks decent. The fact is that over the years of use, the gasket shrinks, dries out, and loses elasticity. If there is no particular desire to observe oil streaks on the cylinder block, it is better to replace the gasket. The following options are recommended:

• PARTS-MALL P1G-C007 , price 30 hryvnia;
• CORTECO 440063P , price 80 hryvnia;
• BGA BGSILC , same price;
• ELRING 136.271 , about 100 hryvnia;
• VICTOR REINZ 71-53137-00 , price 125 hryvnia, one of the best options;
• NIPPARTS J1220907 , price 200 hryvnia;
• GLASER X83283-01, about 250 hryvnia.

We adjust the valve clearances of Daewoo Matiz

The adjustment is carried out with the engine cooled down to 20 degrees. If the temperature is higher or lower, it is necessary to adjust the gap size plus or minus one hundredth.

First, let's jack up the car and remove the front right wheel and mudguard, install a stand under the hub and lower the jack.

Open the hood and remove the air filter along with the housing and the entire pipeline assembly.

Now it’s the turn of the ignition module. We disconnect the high-voltage wires and the terminal block on the back of the module. After this, unscrew the three bolts securing the module and remove it.

Disconnect the vacuum hoses and remove the throttle cable. Now remove the connector from the sensor and the pipe behind it. They will also interfere.

We remove the breather hose and at the same time check its integrity. Especially in the place indicated by the arrow. If a crack forms there, we will get an uncontrolled air leak at the inlet.

Remove the timing cover. First of all, unscrew the two distant bolts on the right side. To do this we use a cardan and an extension. Next, unscrew the other four. Be careful not to tear off the splines. 5mm hex bolts.

Now that the cover is removed, we will set the piston of the first cylinder to the top dead center of the compression stroke by rotating the crankshaft. To do this, we use a 17mm socket, an extension and a wrench. This is why we removed the wheel and mudguard.

To set the first cylinder to TDC, it is not necessary to remove the timing belt cover and align it to the marks. Although, this method has a right to exist and is considered correct.

However, it is much easier and faster to set the piston of the first cylinder to TDC, guided by the position of the piston and the camshaft cam. To do this, turn the crankshaft clockwise (!) until the piston reaches TDC and the camshaft cam points straight down.

In this position we will be able to adjust both valves on the first cylinder, as well as the inlet of the second and the exhaust of the third.

First, let's check the existing gaps with feeler gauges. The feeler gauge should not fit freely between the valve and the rocker arm, but it should not fit too tightly either. The dipstick should slide with little effort.

If there is a need to adjust the gap, take a 12-mm spanner and tear off the fixing nut with it. Without removing the key, use a flat screwdriver to set the required gap by rotating the rocker arm pusher. Having achieved the desired gap, hold the screwdriver in this position and tighten the locknut. We check the gap again, and then tighten the nut with a force of 20 N∙m. We do the same with the remaining free valves.

Now rotate the crankshaft 360 degrees. At this time, the camshaft will rotate 180 degrees. In this position, we adjust both valves of the third (fourth cylinder on a liter engine), as well as the second exhaust (and third intake cylinder on a liter engine).

After adjustment, tighten the locknuts again and check the clearances on each valve again. When assembling, carefully wipe all mating surfaces with a rag, and tighten the valve cover crosswise, starting from the center, with a torque of 10 N∙m. We carry out the assembly in the reverse order.

Preparatory Before

All you need to remember is that all adjustment work is performed on a cold engine. Let's complete Now the set of necessary tools:

• set of open-end wrenches;
• screwdriver set;
• set of heads;
• kit;
• imbus wrench pliers;
• set of measuring Procedure.

gap adjustment probes require a number of preparatory measures, because it will not be possible to simply get to the timing belt units. First of all, you should disconnect the negative cable of the battery.

housing Removing the air filter

The process consists of several transitions:

1. Using a flathead screwdriver, loosen the air duct clamp.
2. Disconnect the filter pipe from For.
3. air duct Matiz 0.8 l, disconnect the engine control harness system block and remove the temperature sensor, remove the air hose from the filter housing.
4. Using a 10" head, unscrew the bolts securing the filter housing to the air intake and remove them.
5. Lift the housing with the air intake and resonator and remove the two pins from the rubber pads.
6. Dismantle Dismantling.

ignition coil block assembly

The following procedure, the procedure for which adjusting the valves on a Matiz Daewoo car is impossible, is performed according to the scheme:

1. Release the brake pads from the engine control system harness.
2. Remove the block from the ignition coil assembly.
3. Slide the rubber caps off the terminals of the coil block and disconnect the high voltage wires.
4. Using a “10” socket, unscrew the three bolts securing the coils and the cover bracket. Remove.
5. Cylinder head ignition coil assembly.

Removing the throttle assembly

The technological map of this process includes the following work:

1. Disconnect the crankcase venting tube from the air duct connection.
2. Disconnect the hose from the air filter housing and remove the air duct.
3. Disconnect the terminal wires from the XX regulator (for the Matiz 0.8 l internal combustion engine).
4. Disconnect the wires from the throttle position sensor.
5. Drain the antifreeze from the expansion tank to about.
6. Use pliers to compress the clamps of the coolant supply hoses to the throttle block pipes and disconnect them.
7. Using a hexagon, remove the four bolts securing the throttle block and intake manifold.
8. throttle Remove the assembly.