Removing an automatic transmission on a car Nissan Almera G15 generation is a complex procedure that requires high precision and specialized equipment. Unlike simpler mechanical units, the automatic transmission here has a complex fastening system integrated with the subframe and exhaust system elements, which complicates access to the unit.
Often the need to remove gearboxes occurs when carrying out a major overhaul of the valve body, replacing solenoids or eliminating oil seal leaks. The process requires not only physical strength, but also a deep understanding of the design of the front suspension and transmission, since an error in the disconnection step can lead to damage to the sensors or the crankcase.
In this article we will analyze in detail each stage of work, from preparing tools to the final removal of the unit. We will pay special attention to the specifics of the model Almera G15, where the layout of the power unit has its own unique features that distinguish it from similar models, such as Nissan Tiida or Sentra.
Preparatory activities and necessary tools
Before starting any manipulations with the transmission, it is necessary to ensure safety and access to the mounting points. Work for Nissan Almera requires a lift or inspection hole of sufficient depth, since the main work is carried out from below the car. Failure to do so may result in personal injury or inability to remove key bolts.
You will need a set of sockets, including extensions and universal joints, since access to the upper automatic transmission mounting bolts is often limited. Pay special attention to the heads on 14, 17 and 19 millimeters, which are most often used in suspension and subframe mounting units. Also don't forget about a jack to support the engine and subframe.
- 🔧 Hydraulic jack or stand for support subframe
- 🔧 Set of keys and sockets (metric system)
- 🔧 Torque wrench for precise bolt tightening
- 🔧 Rags and container for draining transmission fluid
It is important to purchase a new automatic transmission pan or sealing gasket in advance, since when the unit is removed, the old gasket is almost guaranteed to lose its properties. If you plan to drain the oil, make sure you have enough new fluid Nissan Matic J or CVT Fluid NS-3 (depending on the type of transmission on your car).
⚠️ Attention: Before starting work, be sure to disconnect the negative terminal of the battery. On the model Almera G15 Transmission sensors are located in close proximity to high-voltage wires of the ignition system, and a short circuit can damage the engine ECU.
Removing suspension elements and exhaust system
The first stage of real work is to free up the space around gearboxes. On Nissan Almera This starts with removing the crankcase guard and disconnecting the exhaust system components. The exhaust pipe is attached to brackets, which often stick to the body due to high temperatures, so the use of penetrating lubricant will be mandatory.
It is necessary to carefully unscrew the bolts securing the exhaust pipe to the manifold and disconnect the resonator from the suspensions. It is important to prevent the exhaust system from sagging to avoid damaging the catalytic converter or flexible connections. Use safety ropes or wire to hang the pipe in the up position.
- 🔩 Unscrew the bolts securing the front cross member (subframe) on one side
- 🔩 Remove the right front wheel arch and mudguard for better access
- 🔩 Disconnect the speed and throttle position sensors
The next step is to dismantle the anti-roll bar and disconnect the steering tip from the steering knuckle. This is necessary in order to lower the subframe down. On some modifications Almera G15 it is necessary to dismantle the suspension arms completely, which significantly increases the operating time.
Pay special attention to the fastenings of fuel lines and brake pipes that run in close proximity to the dismantling area. Accidentally damaging them can lead to dangerous driving situations in the future. Inspect each clamp and fastener before starting to disconnect.
⚠️ Attention: When lowering the subframe, be careful not to damage the engine oil pan. On Nissan Almera The distance between the subframe and the engine crankcase is minimal, and incorrect movement of the jack can cause a crack in the aluminum.
After loosening all fastenings, the subframe can be carefully lowered on the jack, controlling its position. This will create the necessary clearance for removal torque converter and disconnecting the gearbox from the engine. The process requires an assistant who will monitor the condition of the wiring and tubes.
- Torque wrench
- Circlip remover
- Hydraulic jack
- Special oil drain adapter
Disconnecting the torque converter and electrical connectors
Before lowering the transmission, you must separate the torque converter from the engine flywheel. This is done through a technological window located under the engine. You will have to rotate the crankshaft to get to each mounting bolt. flange torque converter.
The torque converter bolts are often over-tightened, so use an extension socket and ratchet. Be sure to secure the crankshaft so that it does not rotate when unscrewing. Typically, a special clamp or screwdriver is used for this, inserted between the teeth of the flywheel ring.
At the same time, it is necessary to disconnect all electrical connectors going to the automatic transmission. On the model Almera G15 These are connectors for input and output shaft sensors, control solenoids and connectors for connecting to the transmission control unit. Be extremely careful with plastic clips as they are fragile and easily break if handled roughly.
- ⚡ Disconnect the speed sensor connectors (Input/Output Speed Sensors)
- ⚡ Disconnect the solenoid valves (Solenoids)
- ⚡ Disconnect the Range Switch connector
Also, do not forget to disconnect the gear selector cable and the speedometer drive cable (if it is mechanical). These elements are fixed with plastic clips or bolts, which must be carefully released. The wires must be laid aside and secured so that they do not interfere with the lowering of the box.
⚠️ Caution: The torque converter remains attached to the engine and should not rotate freely. If you try to remove the box without first removing all the flange bolts, you are guaranteed to damage the flywheel or torque converter housing.
What to do if the torque converter bolts are stuck?
If the bolts do not budge, use a penetrating lubricant and allow it time to penetrate the threads. Sometimes heating the bolts with a blowtorch (careful with oil!) helps, but it is better to use a high-quality impact tool or a special puller.
Removing the subframe and lowering the gearbox
This is the most critical stage of work, requiring coordination of actions. Stretcher Nissan Almera supports not only the engine, but also the gearbox, as well as elements of the front suspension. Its complete removal or significant lowering is necessary for free exit Automatic transmission down.
Install a powerful hydraulic jack under the subframe. Slowly and smoothly lower it 10-15 centimeters. At this moment, you need to control the tension of all tubes and wires. If you feel resistance, stop immediately and check what remains secure. Often the problem lies in an unscrewed brake hose mounting bracket.
Once the subframe is lowered to a sufficient height, you can begin to unscrew the bolts securing the gearbox itself to the engine block. Usually there are four upper and two lower. Use a long wrench as access to the top bolts is extremely limited.
- 🔩 Unscrew the bolts securing the gearbox to the engine (upper and lower)
- 🔩 Disconnect the driveline (if applicable to the modification)
- 🔩 Make sure the box is only hanging on the jack
Now you can carefully lower the gearbox down using a separate jack under its sump or crankcase. Movements must be smooth so as not to damage the crankshaft oil seal and not move the torque converter out of place. The box is heavy, so working alone is impossible.
☑️ Control when lowering the subframe
Removing the unit and checking the condition of the nodes
When the gearbox is lowered to a safe height, it can be completely removed from the engine compartment. To do this, you will need to tilt it at an angle and roll it out on a wheeled cart or carry it by hand. Be careful with the heavy weight of the unit to avoid damaging the garage floor or causing a back injury.
After extraction Automatic transmission It is necessary to immediately inspect the junction with the engine. Check the condition of the flywheel for chips or cracks. Inspect the crankshaft oil seal - if it is leaking, it must be replaced before installing a new or repaired gearbox.
Also check the condition of the torque converter. If traces of emulsion (water in oil) are visible inside, this indicates a problem with the cooling radiator. Dirty oil or metal shavings on the torque converter housing require it to be cleaned or replaced.
It is important to check the condition of the guide bushings and bearings that are located in the area where the box is mounted. Any wear here may result in vibrations and noise after assembly. If you see obvious damage, replace the affected parts before installation.
| Parameter | Normal condition | Symptoms of a problem |
|---|---|---|
| Oil seal condition | Dry, no traces of oil | Wet, smudges, dirt |
| Flywheel | Smooth surface, no cracks | Cracks, chips, wear |
| Torque converter | Pure, no emulsion | Oil and water, metal dust |
| Fastenings | The thread is intact, the bolts are not broken | Torn threads, chipped metal |
If you are planning to repair the box, then after removing it, you must thoroughly rinse the outside of it to remove oil and dirt. This will simplify diagnostics and allow you to see hidden cracks in the body. Be sure to plug any open holes to prevent dust from getting inside.
Before removing the box, take photographs of the location of all wires and tubes. This will save you hours of time on reassembly and help you avoid wiring errors.
Complete removal of the subframe on the Nissan Almera G15 is a key step, without which it is impossible to safely remove the automatic transmission due to the close arrangement of the engine and suspension.
Features of reassembly and final checks
Installation Automatic transmission happens in the reverse order, but with certain nuances. Before lifting the box, make sure that the torque converter is completely and tightly seated on the splines of the automatic transmission pump. This is a critical point: if you try to pull the engine box off without making sure, you will break the transmission pump.
Check the position of the torque converter by the gap between its flange and the box body. It should sit flush. Only after this can you carefully lift the unit with a jack and align it with the engine. Use guide pins to make the joining process easier.
The bolts securing the box to the engine and subframe must be tightened with a torque wrench in compliance with the tightening torque specified in the technical documentation. On Nissan Almera the moments are often different for bolts of different diameters, so they cannot be mixed up.
- ✅ Check the transmission fluid level after warming up
- ✅ Make an adaptation of the solenoids via a scanner (if necessary)
- ✅ Check the operation of the selector in all positions
After installing all the suspension components and exhaust system, it is necessary to conduct a test drive. Pay attention to the smoothness of switching, the absence of extraneous noise and vibration. If there are transmission errors, they must be erased through the diagnostic connector.
How to check if the torque converter is seated correctly?
Insert a long screwdriver or feeler gauge into the space between the flywheel and the torque converter flange. If it goes in deeply and evenly in a circle, then the splines are aligned. If there is a gap or the probe does not fit, the transformer has not sat down completely.
The final step is to check the tightness of all connections. Inspect the junction of the box and the engine, the pan, as well as the connection points of the cooling pipes. Any oil leak can lead to overheating of the transmission and its rapid failure.
⚠️ Attention: Never start the engine without checking the oil level in the automatic transmission. The gearbox pump is not lubricated and can fail within seconds of dry operation.
Frequently asked questions when dismantling an automatic transmission
Do I need to remove the engine to replace the automatic transmission on the Almera G15?
No, you do not need to remove the engine. On the model Nissan Almera G15 The gearbox is removed through the bottom of the car after removing the subframe. This is standard procedure for front-wheel drive vehicles in this class.
What kind of oil should be poured when replacing an automatic transmission?
For most automatic transmissions Nissan liquid is used Nissan Matic J. However, CVTs require a specific fluid. NS-3. Be sure to check the transmission type in the service book or the vehicle's VIN code before purchasing oil.
Is it possible to remove the automatic transmission without removing the subframe?
In rare cases, if you have a lot of experience and a specific tool, you can try to remove the box by only lowering the subframe a little. But for Almera G15 it is extremely difficult and risky. Complete removal or significant lowering of the subframe is recommended for safe operation.
How long does it take to remove and install an automatic transmission?
If you have experience and two people, the process takes from 4 to 6 hours. A beginner without specialized equipment may need 8 to 10 hours. The time depends greatly on the condition of the bolts and the need to dismantle additional elements.
What should I do if, after installation, the gearbox does not change gears?
First of all, check the oil level and the correct connections of the connectors. If everything is in order, you may need to adapt the solenoids through the diagnostic scanner. Also check the position of the selector cable, as an incorrect setting may block shifting.