In detail: steering rack Daewoo Takuma DIY repair from a real master for the site my.housecope.com.
Chevrolet Rezzo. STEERING
On Chevrolet Rezzo cars, power steering and a gear-rack-type steering mechanism are installed. The steering system of a car consists of a steering wheel, a steering column, a steering gear equipped with a hydraulic booster, and two steering rods connected by ball joints to the steering knuckles of the front suspension.
Steering wheel with driver's airbag, in the steering wheel spokes
Rice. 8.1. Steering column: 1 - steering column shaft; 2 - steering column housing; 3 - a mechanism for adjusting the position of the steering column; 4- ignition switch (lock)
The switches for the sound signal are attached. The steering wheel hub is attached with a nut to the steering column shaft.
The steering column (Fig. 8.1) is crash-proof, adjustable in tilt angle, equipped with energy-absorbing elements that increase passive safety, and an anti-theft device in the ignition switch (lock) that blocks its shaft. The intermediate steering shaft is connected to the steering shaft and the steering column shaft by cardan joints. The steering column also contains controls for headlights, direction indicators, washer and windshield wiper.
The steering gear (Fig. 8.2) is installed in the engine compartment. The steering housing is attached to the front axle cross member.
Video (click to play).
The pressure of the working fluid in the hydraulic booster is created by a vane-type pump, which is installed on the engine bracket and is driven by a poly V-belt from the crankshaft pulley. The bypass valve installed in the pump maintains the required pressure of the working fluid in the power steering, depending on the engine speed.
The power steering reservoir is installed in the engine compartment on a bracket near the battery mounting shelf and is connected by hoses to the power steering pump and to the working fluid return line. If the power steering fails, the ability to control the vehicle remains, but the effort on the steering wheel increases. Steering rods 2 and 8 (see Fig. 8.2) are attached to the steering rack by 6 ball joints. The ends 1 and 9 of the steering rods are attached to the steering knuckles of the front suspension by means of ball joints. The tips are secured against turning on the steering rods with locknuts. The toe-in of the steered wheels is controlled by rotation of the steering rod in the ball joint relative to the tip.
Chevrolet Rezzo. INSPECTION AND INSPECTION OF THE STEERING CONTROL ON THE VEHICLE
Check the condition of the steering regularly as driving safety depends on it.
When inspecting the steering, pay particular attention to the condition of the protective covers and screw connections. Be sure to replace torn, cracked or lost elasticity rubber covers, otherwise water, dust and dirt trapped in the nodes will quickly disable them.
On vehicles equipped with a power steering, check the condition of the hoses and pipes connecting the pump, reservoir and steering gear.
reliability of fastening of the steering mechanism and steering wheel;
- no clearance in the steering rod bushings and ball joints of the steering rod ends;
- reliability of tightening and locking of the bolts fastening the rods to the rail and nuts of the ball joints;
- the absence of jamming and hindrances that impede the turning of the steering wheel.
If you find knocking and jamming, disconnect the steering rods from the telescopic arms pivot arms and repeat the check. If the knocking and jamming continues, remove the steering gear from the vehicle and repair it.
1. Check the condition of the protective covers of the ends of the steering rods. Replace covers that are torn, cracked, or lacking elasticity.
2. By sharply turning the steering wheel in both directions (this should be done by an assistant), visually and audibly check the fastening of the steering mechanism. Moving the mechanism and knocking is not allowed.
As a result of natural wear of the oil seals and the main shaft, the steering rack leaks after 120-150 thousand kilometers. Unfortunately, many car enthusiasts encounter such a nuisance much earlier. Hence the logical question - is it possible to eliminate the problem that has arisen, or is it better to immediately change the unit. Since this malfunction is not uncommon, drivers need to know what to do when it is discovered.
The problem in the form of leaks is characteristic of steering racks, acting in conjunction with a hydraulic booster (power steering). Inside the body of the unit there are 2 oil-filled chambers with pistons, which help to move the shaft under the influence of the pressure generated by the pump. To prevent hydraulic fluid from leaking out, the chambers are closed on the sides with oil seals, inside which the shaft moves. Outside, the ends of the body are covered with rubber covers (anthers) in the form of accordions, through which the ends of the steering rods are passed.
When to pay attention to the steering rack and check for drips:
oil spots appear on the asphalt in the parking lot;
the liquid level in the power steering expansion tank gradually decreases;
the power steering pump emits a hum or other extraneous sounds (depending on the car brand);
the steering wheel feels heavy, as if the amplifier has stopped helping the driver turn the wheels.
Since the body of the rail is a one-piece structure, drips are found only under its ends, covered with anthers.... To see them, just look under the car or into the engine compartment.
The consequences of a hydraulic fluid leak in the first stage are not fatal. After detecting drips, you can continue driving, but only to the garage or car service. Further operation of the car without repair is allowed under two conditions:
The steering wheel is not "heavy", and the power steering pump functions properly, without unnecessary noise.
It is necessary to constantly add fluid to the power steering reservoir.
An important point! A ride like this can end badly. Once in the parking lot, more oil will flow out of the rail, as a result of which the hydraulic pump will fail after the engine is started. Repairing both units will cost twice as much.
There are several common reasons a steering rack leaks:
The main thing is riding with torn rubber covers. Moisture penetrates through the holes and enters the shaft, causing corrosion. The rusty surface becomes rough and begins to rub the lip of the oil seal. The slightest gap is enough to force the oil to burst out.
Failure to comply with the rules for handling the hydraulic booster. Holding the steering wheel for a long time in the extreme position leads to an increase in pressure inside the chambers and pushing the oil seals. If the driver constantly repeats the mistake, oil drips from the rack will inevitably appear.
Topping up with an unsuitable hydraulic fluid or other composition that destroys the rubber of the oil seals.
Long-term operation without changing the fluid that collects debris and small chips. In this case, the gland leaks due to abrasion.
Critical wear of the hinge joints of the steering ends with the shaft.Due to the dangling rod, air and moisture penetrate under the boot and cause corrosion. Further, the process proceeds according to the scenario described in the first paragraph.
Repair of the steering rack is possible, and the cost of the event depends on the degree of wear. In some especially neglected situations, the unit cannot be restored.
Before drawing any conclusions, it is necessary to get to the insides of the assembly and examine the degree of wear of the parts. What to do when oil leaks from the rail are detected:
Place the car on the inspection ditch, fix with the hand brake and remove the front wheels, substituting reliable pads.
Using a puller, press the tie rod ball pins out of the steering knuckle lugs. First unscrew the nuts securing the hinges.
Remove all elements that interfere with the dismantling of the rail. In most passenger cars, you have to remove the battery, air filter and absorber tank.
Unscrew the steering wheel all the way to secure it with the mechanical anti-theft lock. Disassemble the fastening of the steering shaft to the rack.
Drain the power steering system and disconnect the fluid supply pipes from the unit.
Unscrew the steering rack and remove it from the car. On some models it is attached to the body, on others to a subframe.
Note. An experienced craftsman is able to carry out repairs without dismantling the unit from the machine. But if you have taken up the issue on your own, it is better to remove the rail. So it is more convenient to disassemble and replace worn parts.
To get to the oil seals, pull off the rubber boots fixed with retaining rings or metal clamps. After that, the reasons for the leakage of the steering rack become visible. What action to take depends on the technical condition of the insides:
You're in luck if there are no rust marks on the shaft, only drips are visible. It is enough to replace the oil seals, both parts.
The rusty shaft will have to be removed. Small foci of corrosion are removed by grooving and grinding on the machine, after which repair seals are installed, whose inner diameter is selected according to the new shaft size.
It is better to replace a too rusted shaft with a new one, it will come out more reliable and cheaper in the future.
A complete replacement of the rack is carried out after critical wear of the gears is identified, which manifests itself with a knock during driving. An accurate diagnosis is made after disassembling the unit.
To pull out the shaft, you need to unscrew the protective covers (if any) and the gear adjustment washer, having previously marked its position. Then both shafts are removed - the leading steering and rack and pinion. In the last turn, polymer bushings and oil seals are carefully knocked out (held by retaining rings). At the end, the body is thoroughly washed out.
Advice. Before choosing a repair method, show the removed unit to the master - auto mechanic. He will determine the degree of wear on the shaft and tell you how best to proceed in your situation.
If you decide to do all the repair work with your own hands, then it is more correct to choose option number 3 - simply change the shaft and oil seals. Original spare parts will last at least 100 thousand km, provided that the damaged rubber covers are replaced in a timely manner.
The option with groove and grinding is less reliable - people do the work and not always with high quality... After careless processing, the surface of the shaft will remain rough and will immediately begin to abrade the newly installed oil seals. The rail can flow again literally in 20-40 thousand km.
The installation of the unit and the assembly of the vehicle is carried out in the reverse order. Pay particular attention to filling the system with hydraulic fluid, which must also be changed. There should be no air congestion in it. After checking the performance, be sure to visit the service station in order to correct the camber angles - toe-in of the front wheels.
Daewoo Nexia, like every car, must have weak points. One of them is the steering rack.The knock and rumble when driving will not please anyone, especially when it comes to the steering mechanism. The new Nexia steering rack is capable of silently depart no more than 30-40 thousand km, after which the rake starts knocking. Regardless of whether the car is with or without power steering. You should not panic in such cases; instead, you can tighten the steering rack on the Daewoo Nexia, moreover, in two different ways.
With a strong running knock, the rail will only be saved by repair or a complete replacement.
The brace removes the extra clearance between the gear and the rack.
However, if the steering gear is tightened in time, the mileage before the steering overhaul can be increased. For tightening, we need either keys for 26 and 50 or a hammer, a long beard with a bent end and the same key for 26. The first option is for the lazy:
We install the car on a level surface.
We substitute anti-rollbacks under the rear wheels.
We tear off the bolts of the left wheel.
We hang out the left side and remove the wheel.
We turn the steering wheel all the way to the right.
For insurance, we install a stand under the lever.
We hang out the wheel of the car and put the stand.
This is how the adjustment process looks on the removed steering gear.
The second option for tightening the rail is more convenient, but also more time consuming. In this case, for adjustment, we will remove the vacuum brake booster.
With the vacuum brake booster removed, access to the rack is opened from above.
If you remove it, then we can more accurately adjust the gap between the rail and the plunger.
To loosen the castellated lock nut, we will use a spanner wrench of 50, and the rest, in terms of parameters and methodology, the algorithm corresponds to the previous one.
In the latter case, after adjustment, we will be able to tighten the locknut with a nominal force of 70 Nm and at the same time hold the adjusting plug with a 26 key. This will improve the accuracy of the adjustment.
For the convenience of tightening, some craftsmen make such a short 50 key, but the problem is that on old Nexias the locknut is often knocked down and the key turns.
If the steering wheel rotates freely on the move, the backlash is within the permissible 10 degrees and when turning the wheels themselves return to the neutral position, the adjustment was successful. Good luck to everyone, smooth roads and smooth turns!