Why is the lack of power after the overhaul of the four cylinder oil engine

Is the valve clearance not adjusted well!

Reasons why you don't get oil after an engine overhaul:

2. The oil pump cannot effectively suck in and pump out the oil due to dirty or viscous oil, resulting in low or no pressure oil pressure. Solution: Change the oil;

3. The oil is thin or the oil becomes thin due to the high temperature of the engine, which will leak from the gap of each friction pair of the engine, resulting in low oil pressure. Solution: change the oil or overhaul the cooling system;

4. Oil leakage of oil pipe, damage to the oil pump or excessive wear of its parts will lead to a reduction in the intake and pumping of oil, or no amount at all, resulting in low or no pressure in the oil pressure. Solution: Overhaul.

It has to do with the principle of operation of the engine.

The combustion chamber of the transmitter produces high-pressure exhaust gases, which contain water vapor.

When there is a wear gap between the piston ring and the piston wall, exhaust gases can enter the lubrication system.

The water vapor is mixed with the oil vapor and forms a state of water ingress for a long time.

Related to the working principle of the engine The combustion chamber of the transmitter produces high-pressure exhaust gases, which contain water vapor When there is a wear gap between the piston ring and the piston wall, the exhaust gas may enter the lubrication system; The water vapor is mixed with the oil vapor and forms a state of water ingress for a long time.

Excessive clearance between the crankshaft and the large and small watts leads to oil leakage in the car, resulting in low oil pressure. Solution: Check the crankshaft of the car engine.

The spring of the automobile pressure limiting valve or pressure relief valve is too soft, and the function of the valve is lost or weakened due to hairpin or ball damage, resulting in a decrease in oil pressure. Solution: Replace the pressure limiting valve or pressure relief valve spring.

Low oil pressure due to faulty automotive oil induction plugs, pressure gauges, or electrical circuits. Solution: Replace the oil induction plug, pressure gauge or circuit.

If the oil pressure is too low when the oil pump function, oil pressure indication system, and pressure reducing valve are normal, it must be that the oil leakage of the camshaft bearing and crankshaft bearing is too large.

According to the question, what it means is that there is organic oil pressure before overhaul, and there is no oil pressure after overhaul? The engine overhaul is carried out in accordance with the requirements of the specification, the replacement parts have been replaced, all faults have been solved, there should not be no oil pressure, and the remaining problem is to make adjustments after repair. Oil pressure is an important problem, and it is a fault that must be paid attention to and solved in the overhaul.

Otherwise, the overhaul is not successful, or it does not have the technical ability to overhaul, and it is not called an overhaul.

Pro: The reason for the lack of power after the engine overhaul may be the failure of the spark plug: 1. The spark plug, commonly known as the nozzle, its function is to discharge the pulse high-voltage electricity sent by the high-voltage wire, penetrate the air between the two electrodes of the spark plug, and generate an electric spark to introduce the mixed gas in the gas cylinder; 2. The main types are:

Quasi-type spark plugs, edge body protruding spark plugs, electrode type spark plugs, seat type spark plugs, polar type spark plugs, surface jump fire type spark plugs, etc.: 3. The function of the spark plug is to introduce tens of thousands of volts of high-voltage electricity into the combustion chamber, and generate an electric spark to ignite the mixture, and cooperate with the ignition system and the oil supply system to make the engine work, which determines the performance of the engine to a large extent.

Summary. Hello, glad to answer for you. After the engine overhaul, it is recommended that when the connecting rod copper sleeve is rehed, how to ensure the 5261 coaxiality of the reaming repair 2113 to ensure that the center distance between the original pin hole and the connecting rod tile hole is unchanged at 4102.

2.When the connecting rod tile is selected, it should be sure that 1653 guarantees the standard clearance of the model, and when the gap is too large, it is also equivalent to the small distance between the center distance between the pin hole and the connecting rod tile hole. At the moment of normalization of epidemic prevention and control, pay attention to self-protection when traveling, and wish you all the best, happiness and health for your family!

The engine is underpowered after an overhaul.

Hello, glad to answer for you. After the engine overhaul, it is recommended that when the connecting rod copper sleeve is rehed, how to ensure the 5261 coaxiality of the reaming repair 2113 to ensure that the center distance between the original pin hole and the connecting rod tile hole is unchanged at 4102. 2.

When the connecting rod tile is selected, it should be sure that 1653 guarantees the standard clearance of the model, and when the gap is too large, it is also equivalent to the small distance between the center distance between the pin hole and the connecting rod tile hole. At the moment of normalization of epidemic prevention and control, pay attention to self-protection when traveling, and wish you all the best, happiness and health for your family!

Hello, additional note: 3When the crankshaft is grinded, the radius of rotation of the crankshaft should be ensured to be unchanged, otherwise the $h value in the figure will also appear.

4.Ensure that the thickness of the cylinder gasket should meet the specified requirements when the cylinder gasket is replaced during maintenance, otherwise the volume of the combustion chamber will be increased and the compression ratio will be reduced. 5.

During the maintenance, it should be ensured that when the valve seat is hinged, the sagging amount of the valve meets the specified value, and when the sagging amount of the valve is too large, the volume of the combustion chamber will increase and the compression ratio will be reduced. 6.If you replace the valve, the optional valve should be the same as the original machine, because the valve has a flat top and a concave top, if the original machine is a flat top, when you replace the concave top valve, the volume of the combustion chamber will increase, and the compression ratio will also be reduced.

The key to influencing the performance of the engine is the compression ratio. How to ensure the standard value of the compression ratio in maintenance, it is recommended that maintenance personnel strictly follow the above six maintenance quality before assembly, so as to ensure that the repaired engine meets the specified power, economy and environmental protection indicators. I hope the above is helpful to you, and I wish you a happy life!

What is the cause of insufficient power after engine overhaul? The reason for the lack of power after an engine overhaul may be a faulty spark plug:

1. The spark plug, commonly known as the fire nozzle, its function is to discharge the pulse high-voltage electric discharge from the high-voltage wire, penetrate the air between the two electrodes of the spark plug, and generate an electric spark to draw the mixed gas in the gas cylinder;

2. The main types are: quasi-type spark plugs, edge body protruding spark plugs, electrode type spark plugs, seat type spark plugs, polar type spark plugs, surface jumping fire type spark plugs, etc.;

3. The function of the spark plug is to introduce tens of thousands of volts of high-voltage electricity into the combustion chamber, and generate an electric spark to ignite the mixture, and cooperate with the ignition system and the oil supply system to make the engine work, which determines the performance of the engine to a large extent.

Will it block the intercooling?

In this case, if there is a problem after the overhaul, you first need to check whether the turbocharger is working normally here, and see if there is a problem with the turbo.

It's hard to run and lose speed.

Look at the turbo here, look at the boost number here, there is no problem here, you need to take a look here.

The pressurization volume is normal.

Will the intercooler be blocked.

It doesn't matter much here, if it's blocked, there will be no pressurization pressure.

Sanyuan didn't see it.

There is no problem, will the piston ring leak air?

Has the cylinder pressure been tested, is it normal?

New one. It is also possible that the new assembly is not good.

1. The fuel filter has not been closed or blocked for a long time.

Service recommendation: Replace the fuel filter.

2. The air filter is too dirty or blocked.

Repair recommendation: Replace the air filter.

3. The fuel supply pump is damaged or the plunger parts are worn.

Repair recommendations: Replace the couple parts or repair the fuel pump.

4. The fuel nozzle of the injector is damaged or the grease nipple is worn.

Repair suggestion: Replace the coupling or repair the injector.

5. Fuel injection timing changes.

Maintenance suggestion: adjust according to the manufacturer's regulations of the engine.

6. The cylinder liner piston assembly (four matching) is seriously worn or damaged.

Repair suggestion: Replace the four matching components.

7. The valve assembly is worn or damaged.

Repair recommendations: Replace the components or repair the valve assembly.

8. Valve clearance changes.

Maintenance suggestion: adjust the valve clearance according to the manufacturer's regulations.

Volvo marine engines.

Features: The engine is basically normal when running without load, but the acceleration is slow when running with load, the uphill closing force, the power is insufficient, the engine speed is difficult to increase, and the maximum speed cannot be reached. Troubleshooting:

Press the accelerator pedal all the way down to check if the glycoside valve is fully open. If it can't be fully opened, the blue valve cable or pedal should be adjusted. Check that the air filter cartridge is not clogged and if it is clogged, it should be cleaned or replaced.

Perform fault self-diagnosis and check whether there are fault codes. Sensors and actuators that affect dynamics include coolant temperature sensors, air flow meters or inlet and tube pressure sensors, igniters and oil pumps. Find the fault location according to the displayed fault code.

Check whether the throttle position sensor is in good contact, such as idle contacts, full-load contacts, and the contact between the sheet and the arc resistive film. If the contact is not careful, it should be readjusted or updated according to the standard. Check the ignition timing.

When the engine is hot idling, check that the ignition advance angle should be 10° 15°, and the ignition advance angle when accelerating should be able to automatically advance to 20° 30°. If the ignition advance angle is incorrect when idling, the ignition advance angle should be adjusted, and if the ignition advance angle during acceleration is incorrect, check the ignition advance control circuit and crankshaft position sensor, igniter, etc. Check the coolant temperature sensor.

At different temperatures, the resistance of the coolant temperature sensor should be able to vary according to the specified value. If the specified value is not met, the coolant temperature sensor should be replaced. Check the air flow meter or inlet pipe pressure sensor and replace it if there is any abnormality.

Inspect all spark plugs, high-voltage wires, and ignition coils, and replace them if there are abnormalities. Check the fuel pressure, if the pressure is too low, further check the electric gasoline pump, oil violation regulator, gasoline filter and the inlet filter of the gasoline pump. Dismantle and inspect the injector.

Check whether the fuel injection volume is normal, if the fuel injection volume is abnormal or the fuel injection atomization is poor, the fuel injector should be cleaned or replaced. Measure the compression pressure of the cylinder. If the pressure is too low, the engine should be dismantled.

Troubleshooting: Idling is working fine, but the engine often stalls when the accelerator pedal is suddenly released while driving.

1. If the right fuel is not selected, it will lead to a decrease in output power, causing the mixture to be too thin, resulting in insufficient engine power. The way to deal with it is to choose the appropriate fuel label and do regular maintenance work.

2. Carbon deposition, when the amount of carbon in the engine is too large, it will lead to poor ignition ability, unsatisfactory air intake efficiency, and eventually cause the engine power to not be vertically sufficient. The treatment method is to clean the carbon deposits of the engine to improve the engine power.

3. If the air filter is not replaced for a long time, it will lead to blockage. If the air volume is insufficient, the combustible mixture will be too thick, resulting in insufficient engine power. The solution is to clean the air filter regularly and, if necessary, replace it with a new air filter cavity remnant to ensure that the air intake is in a normal state.

The reasons why the car is not powerful enough to accelerate and are weak are:

1. The engine cylinder pressure is insufficient.

2. The fuel pump and gasoline filter are blocked, so that the engine power is insufficient due to insufficient oil pressure.

3. Overheating of the rubber noise engine will cause poor lubrication, and the engine will enter the protection mode, reduce the engine power, and cause the engine to accelerate weakly.

4. Poor fuel quality causes the power of the car to be reduced and the power to be reduced; Liang Hengshi may be because the gas port of the fuel tank cover is blocked, the gasoline oil pipe is partially blocked, and the oil pressure is insufficient, resulting in the mixture being too thin and the engine acceleration is weak.

5. The fuel injector is blocked, and the over-concentrated mixture leads to poor acceleration.

6. The exhaust part is not smooth, resulting in poor acceleration.

7. The air intake system is blocked, and the air volume is not enough to block the front, which will cause insufficient combustible mixture and reduce the engine power.

8. Incorrect ignition timing can also cause insufficient power and so on, depending on the situation.