The steering rack is one of the key components of the control system, and its failure on a compact hatchback Nissan March (also known as Micra) often requires immediate attention. Symptoms of a malfunction can range from a characteristic knocking sound when driving over bumps to a hydraulic fluid leak or increased steering force in electrical systems. For owners who have the necessary skills, replacing them themselves is an excellent way to save a significant amount of money compared to a visit to a specialized service center.
The process of dismantling the unit on the platform K12 or K13 has its own specific features that differ from larger models of the brand. The main difficulty often lies in the limited space under the hood and the need to carefully disconnect the intermediate shaft from the gear. Incorrect actions can lead to damage to the universal joint or breakage of threaded connections, so it is important to approach the task methodically and using quality tools.
Preparing the workplace and necessary tools
Before you begin any physical impact on the car, you must ensure safety and access to all components. Working under the machine without reliable support is strictly prohibited, especially if you plan to remove the subframe or lower it to access the rack. A standard jack will not be enough, since the vibration when unscrewing the bolts can move the car.
You will need a set of sockets, including dimensions for 12, 14, 17 and 19 millimeters, as well as an extension and a cardan for hard-to-reach places. Be sure to have a pry bar to wring out the suspension components and a penetrating lubricant, such as WD-40, to treat soured threaded joints. If you have a model with hydraulic booster, prepare a container to drain the oil, since fluid leakage is inevitable when the hoses are disconnected.
- 🛠️ Socket set and ratchet wrench
- 🔧 Crowbar and crowbar for dismantling suspension elements
- 💧 Container for draining power steering oil and rags
- 🌲 Penetrating lubricant for subframe bolts
Pay special attention to lighting. It is often dark under the car, and you may not notice a crack in the rack housing or damage to the boots until dismantling. Use a portable flashlight or set up a task light so that it stays on when you move your head.
Removing wheels and protecting body elements
The first step is to lift the car and remove the front wheels. This will open access to the lower shock absorber strut mounts and protective shields, which often interfere with unscrewing the steering end bolts. Remove the wheels carefully to avoid damaging the brake discs and calipers.
After removing the wheels, it is necessary to remove the plastic fender liners (lockers) on both sides. They are attached with screws and plastic clips, which can become fragile due to age. Carefully remove the screws and clips to gain full access to the side of the subframe and where the steering shaft exits.
- 🔩 Unscrew the screws securing the fender liner
- 🛡️ Carefully remove the plastic clips
- 🚗Remove the protective element completely
It is better to immediately remove the removed fender liners to the side so that they do not interfere with work and do not get dirty with oil. If you plan to remove the entire subframe, then removing the wheels and fender liners is a prerequisite for safely lowering the assembly.
⚠️ Attention: Do not leave the wheel arch liners on the ground in mud or on oil-covered asphalt, as the plastic clips may break when reinstalled, which will lead to unnecessary noise in the arch.
Electrical and hydraulic shutdown
If your Nissan March equipped with Electric Power Steering (EPS), the first step is to de-energize the system. Disconnect the negative battery terminal to eliminate the risk of a short circuit when disconnecting the torque sensor connector. The connector is usually located at the top of the rack housing, near the steering shaft.
For models with hydraulic booster (power steering), the procedure is more complicated. You need to loosen the clamps on the high and low pressure hoses by placing a container under them. Hoses often stick to the fittings, so use a special puller or loosen the clamps carefully, without distortion. Never attempt to unscrew hoses if they show signs of corrosion without first treating them with penetrating lubricant.
After disconnecting the hoses, plug the holes in the rack and hoses with clean plugs or rags to prevent dirt from getting inside. This is critically important, as even a microscopic speck of dust can destroy the hydraulic pump or valves of the new rack during subsequent assembly.
- 🔌 Disconnect the negative terminal of the battery
- 🔧 Loosen the hydraulic hose clamps
- 🛢️ Place a container to drain the working fluid
- 🧼 Plug the holes of the disconnected hoses
- Hydraulic (power steering)
- Electric power steering (EUR)
- Mechanical (rare)
Disconnecting the steering shaft and ends
The most critical stage is separating the intermediate shaft from the rack gear. On Nissan March A universal joint is used, which is secured with one or two bolts. These bolts often have a specific head that can slip off if the tool is not selected correctly. Use a secure socket and wrench to avoid breakage.
After unscrewing the cardan shaft bolts, it is necessary to separate the shaft and rack. This may require a pry bar to gently release the joint without damaging the splines. It is important to remember or photograph the position of the shaft relative to the rack, although with proper assembly this is not always critical if there is no play in the splines.
Next, unscrew the nuts securing the steering ends to the steering knuckles. Use a puller to press out the finger tips. If you plan to replace the tips along with the rack, you can unscrew them, but most often they are simply pressed out so as not to damage the threads on the old parts.
☑️ Removing the steering control
⚠️ Attention: When disconnecting the driveshaft, make sure that the steering shaft does not spin freely. This may result in failure of the ignition switch or damage to the steering angle sensor in the column.
What to do if the cardan shaft bolt does not unscrew?
If the bolt is stuck, use heat (gently, within reach) and plenty of penetrating lubricant. You can use an impact screwdriver or a wrench if access allows, but be careful not to strip the threads on the rack itself.
Removing the subframe and dismantling the rack
On most versions Nissan March The steering rack is attached directly to the subframe. Removing it often requires removing the subframe completely or at least lowering it a few centimeters. This is done by unscrewing the four main bolts securing the subframe to the body.
By lowering the subframe, you will have full access to the rack mounting. Unscrew the bolts securing the rack body to the metal beam. The rack can be heavy, so have a helper support it to avoid dropping it on your feet or damaging the bottom components.
- 🔩 Unscrew the subframe mounting bolts
- ⬇️ Carefully lower the subframe onto the jack
- 🔧 Unscrew the bolts securing the rack housing
- 🚗 Remove the rack from the engine compartment
When removing, be careful not to damage the wiring harness wires running near the subframe. Wires may become pinched when the assembly is lowered, causing an open circuit to ABS sensors or other systems.
Lowering the subframe is the safest way to remove the rack, as it eliminates the risk of damage to the body and allows the assembly to be easily removed without unnecessary effort.
Technical nuances and specific points
When replacing the rack with Nissan March It is worth paying attention to the condition of the subframe silent blocks. If you are already removing it to access the rack, it is advisable to immediately replace these elements, since their service life often ends simultaneously with the wear of the steering mechanism.
Also check the condition of the steering wheel boots. If they are cracked or cut, they will need to be replaced, even if the tips are not yet worn out. Moisture and dirt getting inside the boot will quickly damage the hinge, and you will have to disassemble the suspension again.
Use only original or high quality analogue subframe bolts. Reusing old bolts that have already been stretched during dismantling is unacceptable, as this may lead to the subframe tearing off while moving.
| element | Recommended tightening torque | Special Notes |
|---|---|---|
| Subframe bolts | 100-110 Nm | Replace with new ones |
| Steering nut | 35-45 Nm | Use thread locker |
| Cardan shaft bolt | 25-30 Nm | Spline condition monitoring |
| Power steering hose clamps | 15-20 Nm | Do not overtighten to avoid cracking the pipe |
⚠️ Attention: After installing a new rack, it is necessary to carry out the procedure for resetting engine management system errors and calibrating the steering angle if the car is equipped with ESP or a stabilization system.
Before final tightening all subframe bolts, make sure the wheels are level and the steering wheel is in the center position to avoid distorting the suspension geometry.
FAQ: Frequently asked questions
Is it possible to remove the steering rack on a Nissan March without removing the subframe?
In most cases, removing the rack without lowering or removing the subframe is extremely difficult due to limited space and the location of the mounting bolts. It is recommended to lower the subframe at least 5-10 cm to gain access to the lower bolts.
Do I need to change the tie rod ends when replacing the rack?
Preferably. When removing the rack, the tips are subject to stress and the pins may become worn. If the tips are old, it is better to replace them immediately, so as not to return to this issue after several thousand kilometers.
How can I check that the new rack is working properly after installation?
After assembly, it is necessary to bleed the power steering system (if it is hydraulic) or adapt the power steering. Then check for any knocking noises when the steering wheel is rocked and for any fluid leaks. The steering wheel should rotate smoothly without jamming.
How long does it take to replace a steering rack on a Nissan March?
For an experienced craftsman with a good tool, the process takes from 3 to 5 hours. If the subframe is strongly stuck or additional elements (silent blocks, tips) need to be replaced, the time may increase to 6-7 hours.