How to disassemble the cylinder head of a car? How to disassemble and assemble the engine cylinder h

Disassembly steps: 1. Remove the external components of the body and remove the external parts as required, and remove the components such as the motor and generator. Then remove the intake and exhaust manifolds, remove the cylinder head, and then remove the gasoline pumps on both sides, so that the external components of the engine are basically disassembled.

2. Disassemble the body components according to the following requirements: 1) Remove the fixing screws of the cylinder head, pay attention to the screws should be cross-screwed from both ends to the middle, and remove the screws in 3 times. 2) Lift down the cylinder head. 3) Remove the cylinder head gasket and pay attention to the installation direction of the cylinder head gasket.

4) Unscrew the oil drain screws of the oil pan. 5) Turn over the ** motor and remove the oil pan fixing screw (note that the screws should also be loosened from both ends to the middle). Remove the oil pan and oil pan gasket.

6) Unscrew the fixing screws of the primary oil filter, and remove the oil filter, oil pump sprocket and oil pump. 3. Disassemble the engine piston connecting rod group 1) rotate the crankshaft so that the engine cylinder piston is at the bottom dead center. 2) Disassemble the fastening nut of the connecting rod of the cylinder respectively, remove the connecting rod bearing cover, pay attention to the connecting rod pairing mark, and put it in order.

3) Use a rubber hammer or hammer wooden handle to push out the piston connecting rod assembly of the cylinder respectively, catch and take out the piston connecting rod assembly at the cylinder outlet by hand, pay attention to the piston installation direction. 4) Install the connecting rod bearing cover, connecting rod bolt and nut back in their original position, and the connecting rods of different cylinders cannot be exchanged with each other. 5) disassemble the piston connecting rod group of the cylinder with a sample method.

4. Disassemble the engine crankshaft flywheel group 1) Loosen the fastening screws of the flywheel, disassemble the flywheel, the flywheel is heavier, and pay attention to safety when disassembling. 2) Remove the sealing flange and oil seal at the front and rear end of the crankshaft. 3) Loosen the fastening screws of the main bearing cover of the crankshaft from both ends to the middle, and pay attention to the assembly mark and direction of the main bearing cover, and the main bearing cover and bearing pads of different cylinders can not be exchanged with each other.

4) Lift down.

If the engine cylinder head needs to be disassembled and assembled on 2113, it must be disassembled and assembled by the 4S shop or repair shop of the car. It is strictly forbidden to disassemble and assemble the engine cylinder head of the car without authorization, so as to avoid causing the engine failure of the car and affecting the driving safety.

The engine cylinder head is subjected to a variety of stresses such as "tension, compression, bending, and torsion" during work. If the manufacturing process of the engine cylinder head 5261 is not up to standard, or if it is driven violently at high speed, it will easily lead to cracks and even deformation of the engine cylinder head.

At the top of the engine cylinder head is the valve chamber 4102 cover, remove the valve chamber cover, and the main parts of the valve mechanism on the engine cylinder head can be seen at a glance. The valve cover is also made of engineering plastic, which is lightweight, and the cylinder head seal is gasketed.

Extended Information: The engine cylinder head is described as follows:

When the engine camshaft rotates, the cam pushes the rollers on the outside of the rocker arm, and the rocker arm supports the 1653 by the fulcrum, and the inner side will press down to open the valve. There is sliding friction between the camshaft and the rocker arm, and the Yusheng S350 is equipped with rollers, which is known to have less rolling friction resistance and wear than sliding friction, and also reduces operating noise.

The fulcrum of the rocker arm is the hydraulic tappet, which is controlled by the oil pressure and automatically compensates for the valve clearance. As a result, valve noise is rarely audible in engines with this form. If the valve noise is generated, it is either due to a low amount of oil, or excessive wear due to a low amount of oil.

How to disassemble the cylinder head? The car repair master will tell you the correct method, the disassembly speed is fast and easy to learn! Automobile maintenance vehicle cylinder head removal.

When the car is cold, the implementation of the middle of the dismantling is on both sides of the dismantling, so as to ensure that the cylinder head is not deformed.

The order of disassembling and assembling the cylinder head bolts is carried out in accordance with the sequence diagram of tightening the bolts of the cylinder head and the sequence diagram of the tightening bolts of the loose cylinder head.

When installing the cylinder head, all sealing strips or gaskets should be replaced, and attention should be paid to the installation position of the gaskets. In particular, the side of the cylinder head gasket marked "oben top" must be facing the cylinder head.

Use a torque wrench and a special tool for disassembling the cylinder head bolts to tighten the cylinder head bolts in four times according to the cylinder head fastening bolt sequence diagram, the first time to tighten 40 Nm, the second time to tighten 60 Nm, the third time to tighten 75 Nm, the fourth time to use a pen to make a 90-degree mark on the bolt, and then use a torque wrench to twist 90 degrees.

Measure the cylinder head.

1. Remove scale and carbon deposits; 2. There is no crack in the cylinder head; 3. There is no corrosion and no damage to the cylinder head; 4. The cylinder head thread is good; 5. The spark plug hole is well threaded; 6. The flatness error of the cylinder head is less than that.

1. Causes of cylinder head flushing:

The engine temperature is too high (the "boiling" exceeds the critical line of the engine temperature); The temperature exceeds 100°C and continues to drive until the engine turns off on its own (the cause of the high temperature has been mentioned earlier);

When the temperature is too high and the engine extinguishes itself, the hood should be opened and let it cool naturally (at this time, the expansion valve cover must not be opened to be burned) and then add water.

2. Causes of cylinder head deformation:

When the temperature is too high, continue driving until the engine turns off on its own, and immediately open the expansion valve (the user uses a towel or something else to prevent steaming.

gas scalding) immediately add cooling water, then the cylinder head will be deformed and scrapped.

The screws are all removed, don't they just come down?

You asked, it means that this is not what you should do! Go to the repair shop! That disassembly and assembly are very particular!

The disassembly method of the automobile cylinder head is as follows:

1. Remove all pipelines connected to the cylinder head and the wiring of the pat brother, and mark them if necessary to prevent confusion;

2. After the engine cools naturally, drain the coolant;

3. For the engine of the overhead camshaft, when disassembling the camshaft, it is necessary to loosen the orange cover of the camshaft fixing screw in accordance with the order of "from both sides to the middle, so as to prevent the camshaft from bending and deformation;

4. When disassembling the bolts of the cylinder head, it must be carried out after the engine is completely cooled, and the disassembly should be carried out in accordance with the principle of "evenly loosening from both sides to the middle diagonally" to prevent the cylinder head from warping and deformation;

5. Remove the old cylinder gasket, clean the cylinder head and cylinder block sealing surface. This work requires special patience and meticulousness, as it thoroughly removes old sealants, carbon deposits and corrosion products from the junction between the cylinder head and the cylinder block, and blows them clean with compressed air.

The disassembly of the cylinder head is as follows: 1. Before disassembling the cylinder head, the anti-theft code of the car should be checked and decoded. Start the engine to run for a few minutes, and when the engine is slightly warm, turn off the ignition switch and disconnect the negative pole of the battery.

Remove the bolts on the cylinder head cover with special tools and remove the cylinder head cover;

2. Put the liquid collector under the radiator, remove the hose under the radiator, and release the coolant in the cooling system. Wrap the supply and return lines in a clean cloth, then carefully unscrew the fuel separation piping from the fuel separation pipe, and wipe the leaking fuel with a rag. For the interface of the oil supply pipe and the oil return pipe, the interface should be blocked to prevent dirt from entering the fuel system;

3. Remove the front exhaust pipe from the intake branch or turbocharger. Remove all the pipes and harness connectors or components connected to the cylinder head such as the cooling system, crankcase ventilation system, secondary air purification system, injection and ignition system, turbocharger and adjustment equipment;

4. Remove the toothed belt from the engine, and at the same time remove the toothed belt tensioner and the bolt on the timing tooth belt with special tools, and remove the toothed belt tensioner and the upper guard of the timing tooth belt;

5. Rotate the crankshaft by hand to make the engine-cylinder piston at the top dead center of the compression stroke, check the marks on the camshaft timing tooth belt pulley, and align with the marks on the cylinder head cover. Use a special tool to remove the combustion bolt on the cylinder head cover in the order of disassembly, and remove the engine cylinder head cover.

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The cylinder head disassembly steps are as follows:1Before disassembling the cylinder head, check the car anti-theft code and decode it.

Start the engine and run for a few minutes. When the engine is slightly warm, turn off the ignition switch and disconnect the negative grounding wire of the battery. Remove the bolts on the cylinder head cover with a special tool and remove the cylinder head cover; 2.

Place the liquid collector under the radiator and remove the hose under the radiator to release the coolant from the cooling system. Wrap the supply line and return line with a clean cloth, then carefully unscrew it from the fuel distribution pipe and wipe the leaking fuel with a cloth. Block the interface between the oil supply pipe and the oil return pipe to prevent dirt from entering the fuel system; 3.

Remove the front exhaust pipe from the intake manifold or turbocharger. Remove all cooling systems, crankcase ventilation systems, secondary air purification systems, injection and ignition systems, tubing in turbocharger regulating devices, harness connectors, or parts connected to the cylinder head; 4.Remove the toothed belt from the engine, and at the same time remove the bolts of the toothed belt tensioner and the timing tooth belt guard with a special tool, and remove the toothed belt tensioner and the timing tooth belt guard; 5.

Turn the crankshaft by hand so that the engine cylinder piston is at the top dead center of the compression stroke. Check that the markings on the camshaft timing gear pulley are aligned with the markings on the cylinder head cover. In the order of disassembly, remove the spark plug on the cylinder head with a special tool and remove the engine cylinder head cover.

1. Instructions: 1) When installing the cylinder head with camshaft, the contact surface of the tappet and the camshaft must be coated with oil.

2) Before installing the cylinder head, remove the plastic gasket that protects the valve, which was brought with the delivery.

3) When replacing the cylinder head, all coolant must be renewed.

2. Disassembly and assembly conditions The engine is in a cold state.

3. Disassembly steps.

1) Turn off the ignition switch and remove the battery grounding wire. Drain the coolant and unplug the coolant hose from the connecting pipe on the cylinder head.

2) Remove the upper part of the intake manifold and plug the inlet pipe on the cylinder head with a clean rag.

3) Remove the spark plug plug and loosen the clamp of the high-pressure ignition wire, as well as the guard plate of the fuel injection valve.

4) Unplug the Hall Sensor, Coolant Temperature Sensor, Air Conditioner Thermal Switch, Fuel Injection Valve.

5) Loosen the wire clamp of the fuel distributor and unplug the vacuum hose on the fuel pressure regulator. Note: The fuel line is under pressure, before loosening the hose fitting, the rag should be placed at the pipe fitting and slowly unplugged the hose to relieve pressure;

6) Unplug the oil supply and return hoses on the fuel distributor, remove the wiring harness bracket and the connecting pipe and the coolant line on the cylinder lifting cover. Hu Wu unscrewed the front exhaust pipe from the exhaust pipe joint.

7) Tighten the ** screw at the end of the toothed belt pulley according to the direction of engine rotation, and remove the upper guard of the toothed belt.

8) I remove the toothed belt from the camshaft timing gear doing orange.

9) Remove the cylinder head cover, loosen and unscrew the cylinder head bolts in order, and gently remove the cylinder head.

4. Installation steps.

1) Stuff a clean rag into the cylinder to prevent dirt from entering the cylinder wall and between the pistons. Also, don't let dirt get into the coolant.

2) Clean the sealing surface of the cylinder head and cylinder block, taking care not to form elongated grooves or scratches (use sandpaper with a particle size of not less than 100).

3) Carefully wipe off the abrasive residue with a rag.

4) Set the piston of the first cylinder at the top dead center and rotate the crankshaft in the opposite direction.

5) Lay the cylinder gasket: pay attention to the positioning pin shown by the arrow; Pay attention to the gasket installation position, the part number should be read out on the inlet side.

6) Attach the cylinder head.

7) Attach the cylinder head bolts and tighten them by hand.

To disassemble the cylinder head, it is necessary to disassemble it in the state of the engine cooling, remove the peripheral accessories on the cylinder head and the connected rolling mountain electric cover leather wire and other devices, disassemble the camshaft according to the situation, and then loosen the cylinder head screws from both sides to the middle diagonally, and screw out the material difference bolt in three times.

1) Remove the engine cover.

2) Remove the exhaust manifold.

3) Disassemble the intake manifold.

4) Remove the timing belt.

5) Remove the cylinder head cover.

6) Remove the camshaft timing gear.

7) Disassemble the timing with automatic tensioning shield coarse shed.

8) Remove the camshaft bearing cover and camshaft.

9) Remove the engine assembly support bracket fixing bolts.

10) Remove the cylinder head bolt stool carefully, and disassemble the cylinder head.

Using a hex wrench, loosen and remove the io cylinder head bolts diagonally from both sides to the middle of the macro.

Lift the cylinder head from the alignment pins of the cylinder block and place the cylinder head on the table.

Hello first remove the engine assembly from the car, and then disassemble the cylinder head, first screw the four corners, loosen a little, and then screw the others, also loosen a little, the same force.

Remove all tubing and wiring connected to the cylinder head and mark if necessary to prevent misalignment.

Wait for the natural cavity of the engine to cool down, and then drain the coolant.

For overhead camshaft engines, when disassembling the camshaft, loosen the fixing screws of the camshaft in the order of "from both sides to the middle" to prevent the camshaft from bending and deformation.

When disassembling the cylinder head bolts, it is necessary to wait for the engine to cool down completely, and the disassembly should be carried out in accordance with the principle of "uniform loosening from both sides to the middle diagonally" to prevent the cylinder head from warping and deformation.