Volvo S40 gearbox flywheel rattle

If there is no abnormal sound in the clutch engagement, but there is an abnormal sound after pressing the clutch pedal, it may be that the front bearing of the first shaft is damaged. The reason is that when the clutch is engaged, the first shaft rotates with the flywheel, and the front bearing of the first shaft has no relative motion, so there is no abnormal sound or the abnormal sound is not obvious; When the clutch is disengaged, the first shaft is separated from the flywheel, and the inner and outer rings of the front bearing of the first shaft move relatively, and if the bearing is damaged, there is an abnormal sound.

If the engine is idling and the transmission is in neutral, there is a less obvious abnormal noise in the front of the transmission, but when the car starts and shifts, the clutch is in a semi-engaged state and makes a strong metal friction sound, which is likely to cause damage to the front bearing of the first axle. The reason is that when the car starts and shifts, the clutch is in a semi-engaged state, and the front bearing of the first axle is subjected to a large load. If the bearing is damaged, it makes a strong metal grinding sound.

If there is an abnormal noise in the front of the transmission, and the abnormal noise disappears after pressing the clutch pedal, it may be that the rear bearing of the first axle and the needle roller bearing at the front of the second axle are faulty. The reason is that after the clutch is disengaged, the rear bearing of the first shaft and the needle roller bearing at the front of the second shaft do not rotate, and the abnormal noise disappears naturally.

If the operation is such as , without stepping on the clutch, tightening the hand brake, and the abnormal noise at the front is aggravated, it is the needle roller bearing at the front of the second shaft that is faulty. The reason is that the clutch is engaged, the first shaft rotates, the hand brake is tightened, the second shaft does not rotate, and the needle roller bearing in front of the second shaft must work, and if it is damaged, there must be abnormal noise.

If the operation is such as, there is a clear abnormal sound during driving, it is most likely caused by the abnormal sound caused by the failure of the constant meshing gear, as for which pair of constant gear failure, it can be judged by listening to the sound from the front to the back by the probe. If the problem is not solved, or there are car failures and auto parts problems that have not been solved, search for "car repair and ask" on the WeChat public platform, and the technical team can answer you in detail for free.

Go to the repair shop to check it, and then you can repair it, [If you have a problem with the car, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

The front wheels of the vehicle make abnormal noises, know what may be the causes of abnormal noises, and check and repair the vehicles accordingly.

Possible causes of squeaky noises.

1.Front shock absorber failure 2Front-wheel drive half-shaft loose 3The chassis screws and rubber components are loose, and the ball joints and bearings are loose.

Inspection steps: Lift the vehicle with a lifter.

Check the chassis front end screws and rubber components for loose pieces.

Remove the front shock absorber and check if the shock absorber is good.

Disassemble the front wheel and check the front wheel bearing.

Check that the front-wheel drive half-shaft is not loose.

Finally, the cause of the failure is determined and the parts are replaced.

Summary: This car generally looks good both from the exterior and the interior, the low fuel consumption of the limb call motive and the fact that the Ming Kai is a turf four-acacia cover drive racing model.

How about the Volvo S40 engine.

In many cases, it is not the internal valve body that is damaged, but the stubborn dirt and impurities inside, especially in the internal valve body, the dirt and impurities accumulate to form a blockage, resulting in the inability to effectively adjust the oil pressure, resulting in the occurrence of the problem of stagnation, impact and slippage. At the same time, the problem of high temperature of the gearbox cannot be ignored. According to the Automatic Transmission Repair Association, it is called

More than 90% of all faulty automatic transmissions are caused by overheating. ”

High temperatures can damage the quality and friction characteristics of the automatic transmission oil, increase friction and wear, and cause the noise of the transmission, as well as sludge (impurities or dirt) inside the transmission (e.g. valve body), resulting in stagnation and shock of the transmission. If the temperature exceeds 120 °C, the rubber sealing material will begin to harden, eventually leading to leakage and reduced hydraulic pressure. If the temperature is higher, the gearbox starts to slip, which in turn causes the temperature to rise even higher.

Audi and other high-end models will call the police and enter the transmission protection mode) If it is not solved in time, the transmission will be scrapped.

Therefore, it is necessary to remove the stubborn dirt and impurities in the gearbox and effectively control the working temperature of the gearbox to completely solve the gearbox problem and prevent its recurrence. This is also the key to achieving "no dismantling and repairing to solve transmission failures", which can be described in detail.