The steering wheel of Nissan's classic Sylphy is crooked

Yesterday morning, a 2012 Nissan Classic Sylphy entered the store. The car was produced in 2014 and has been around for ten years now.

After the car owner entered the store, he first asked the technician if four-wheel alignment could be done and what the price was. Further investigation revealed that the car owner had repaired the chassis at another repair shop. Unexpectedly, after solving the problem of chassis noise, the steering wheel was crooked and would not automatically return to its original position after turning. He searched online and found out that four-wheel alignment was needed, but the small repair shop did not have equipment for four-wheel alignment.

After receiving the car, the mechanic first tested it and found that the problem was indeed as described by the owner. Then he drove the car to the four-wheel alignment device and could see the condition of the chassis. The front part had a MacPherson independent suspension, the rear part had a torsion beam non independent suspension, and the two black lower support arms were just replaced by the owner.

Not only did they replace two lower support arms, but they also replaced two stabilizer bar connecting rods, as shown in the figure below. Both of them made abnormal noises due to problems with the ball joint, which only occurred on bumpy roads. The abnormal noise of the ball head cannot be repaired, only new parts can be replaced.

After connecting the device, the chassis data displayed is as shown in the figure. The technician said that the yellow area indicates the front wheel toe in value, which is incorrect and needs to be adjusted. But I have a question. If the car owner replaces the lower arm and small connecting rod, how will the chassis data change?

机翻 · 通用领域 If you want to adjust the front wheel toe in value, you need to loosen the locking nut and then turn the steering inner rod. However, the driver cannot turn the inner rod, so you need to use fire to heat it up, as shown in the picture, until it is very hot. After heating, the positioning data can be adjusted by twisting the inner tie rod.

As shown in the following figure, the blue arrow indicates the inner tie rod, which is fixed on the steering gear rack on the inside; The green arrow indicates the outer tie rod, with the left ball joint connected to the steering knuckle; The red arrow indicates the locking nut, which is used to fix the steering inner and outer tie rods.

As shown in the figure below, the repairman is turning the inner tie rod to adjust the front wheel toe in value.

After adjusting the chassis data to the specified value, the driver drove the vehicle for a road test and made minor adjustments until the steering wheel was properly adjusted and could return to its original position. At this point, the problem was resolved.