At the end of last month, a Haval H9 owner drove his car to the workshop and told the master that when the car was driving on uneven roads, the chassis would always make a humming noise. I don't know where the problem was.
This is a Haval H9 off-road vehicle with a mileage of more than 70,000 kilometers. The owner said that he would go off-road when he rested on weekends. There was no abnormal noise before. The master said that if there are more offroads, the chassis parts are prone to problems, especially the rubber sleeves and ball joints. After checking
, the master confirmed that the problem lies in the ball joints of the lower arms on both sides of the chassis. When you use a pry to pry the ball joints, you can hear a slight humming sound and there is looseness inside the ball joint. In addition, the rubber sleeve of the stabilizer bar is deformed seriously, and the stabilizer bar cannot be fixed.
How to repair this? The master said that its ball head and lower arm are not integrated. The ball head can be replaced separately, but the ball head frame connecting the ball head and the steering knuckle needs to be replaced. It is not possible to buy a separate ball head. Not beautiful. However, the owner agreed to replace the two ball joints, including two stabilizer bar rubber sleeves
. At the beginning, the master did not want to remove the lower arm as a whole, but only wanted to remove the position where the lower arm was connected to the steering knuckle, and then Knock out the ball head. As shown by the orange arrow in the picture below, the master uses a large crowbar to pry the lower arm, and then hit the ball head shown by the green arrow with a hammer.
However, after several hits, there is no sign of the ball head loosening at all. The ball head is firmly fixed in the lower arm, which requires the entire lower arm to be removed. Because the lower arm rubber sleeve is fixed on the sub-frame with eccentric screws, the chassis data can be adjusted by adjusting the angle of the eccentric screws.
Now, if we want to remove the arm, we must remove the eccentric screw. In order to keep the chassis data correct, the master has marked on the eccentric screw. The arrow shown in the figure below is the mark. When installing, keep these two marks in a straight line. At this time, the eccentric screw has been rotated. After the lower arm of
was removed, the master decided to continue hitting the ball head of the lower arm with a hammer, faster than with a press. As shown by the green arrow in the figure below, put a big iron ring under the lower ball head first, and then hit it with a big hammer. The master
hits the ball with a hammer more than ten times, knocking down the ball head, which is shown by the green arrow, there is looseness inside the ball head. The orange arrow shows the position of the fixed ball head on the lower arm.
In order to ensure the accuracy of the new parts, the master measured the diameter of the old ball head with a vernier caliper. As shown in the figure below, the master sent the measured data to the partner who sold the parts.
The next day, new parts will come back. As shown in the green area in the picture below, this is an old ball head assembly, which includes a ball head and a ball head bracket. Although the old ball head bracket is not damaged, you must bring a new bracket to buy a new ball head. It cannot be bought separately. . The orange arrow shows that the new ball head has been removed from the new bracket by the master; the green arrow shows the stabilizer bar rubber sleeve. Master
used a hammer to knock down the old ball head. It is absolutely impossible to use a hammer to install a new ball head. It is easy to break the ball head with a hammer, which requires a hydraulic press to press it. As shown in the picture below, the master is pressing the new ball head into the lower arm.
As shown in the figure below, this is the ball head after pressing into the lower arm, which has been installed in place. There is also a circlip on the back of the ball head of
, which prevents the ball head from falling off the lower arm. As shown in the figure below, the master is installing this circlip. Z1z
As shown in the picture below, the chassis of this Haval H9 looks very tough! Before installing the lower arm, let's take a look at its installation position. Install the rubber sleeve of the lower arm at the position shown by the orange arrow, and install the ball bracket of the lower arm at the position shown by the green arrow. Z1z
In order to ensure the accuracy of the position of the lower arm rubber sleeve, the master first installs the lower arm ball head bracket, and then uses a small carriage against the ball head to keep the lower arm at the landing angle, and then tighten it. Fix the arm rubber sleeve screw indicated by the orange arrow. Z1z
As shown by the orange arrow in the figure below, the position of the eccentric screw has been adjusted, and then tighten it; the orange arrow shows that the master is tightening another eccentric screw. After installing the left lower arm of
, the master pulls the trolley to the right and installs the right lower arm in the same way. As shown by the arrow, the eccentric screw of the right lower armIt has been installed in place, and the angle is the same as the original one. After the lower arm of
is tightened, the master removes the trolley and checks the screws of the lower arm again. As shown by the arrow in the figure below, this is the installed lower ball head. The removal and installation of the stabilizer bar rubber sleeve is easy, we no longer understand.
Finally, the master drove to the bumpy road to test, the chassis no longer had the previous abnormal noise. At the same time, the master drove the car to the four-wheel aligner and checked that the chassis data was normal, and the problem was solved. This is the process of the master repairing the abnormal noise of the Haval H9. It is also a relatively common fault in the chassis of the car. Car friends will have a brief understanding. For more car maintenance knowledge, please pay attention to the WeChat public account "Mechanic Xiaowu"
This article comes from the author of Autohome and does not represent the viewpoint of Autohome.
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