Engine crankcase, or simply pallet, is one of the most vulnerable parts in a car’s design Nissan Almera new generation (G15). This part not only serves as a reservoir for engine oil, but also protects the internal mechanisms of the power unit from external influences. Owners are often faced with the need to replace it due to corrosion, mechanical damage or a leak in the gasket.
Ignoring sump problems can lead to serious consequences, including engine seizure due to oil starvation. This is especially true for models operated in off-road conditions or harsh winters, when ice chips and reagents quickly destroy the metal. The correct approach to maintenance and timely diagnostics will help avoid costly repairs.
Design features of the Nissan Almera G15 tray
Engines installed on Nissan Almera restyled and pre-restyling versions have their own nuances in the crankcase design. The most common power units K4M (1.6 liters) and HR16DE. The pan for these motors is made of stamped steel, which provides the necessary strength, but makes the part susceptible to corrosion if the paintwork is damaged.
The shape of the crankcase is dictated by the requirements for centrifugal forces and oil distribution during sharp maneuvers. Pallet depth at Almera G15 sufficient to provide oil reserves at negative inclines, but this also makes it more vulnerable to impacts with rocks at low ground clearance. Fastening is carried out around the perimeter through a gasket, which over time becomes tanned and loses its sealing properties.
It is important to consider that the design includes an oil pickup and mesh that are integrated or attached directly to the inside of the crankcase. When dismantling pallet it is necessary to monitor the integrity of these elements, since their damage will lead to chips entering the oil system.
The main causes of malfunctions and oil leaks
The most common problem is the appearance of oil stains under the car. In most cases, the culprit is not the metal itself, but pan gasket, which is destroyed over time under the influence of high temperatures and aggressive chemistry. The rubber loses its elasticity and the tightness of the connection is broken.
Mechanical damage is the second most common cause of component failure. Nissan Almera does not have the highest ground clearance, and the lower part of the engine often takes hits from curbs or stones. Cracks in a cast or stamped part of the crankcase may not be visible from the outside but will result in rapid loss of oil.
- 🔍 Metal corrosion due to reagents and moisture getting into paint microcracks.
- 💧 Overfilling oil or using low-quality sealants during previous repairs.
- 🔧 Breakage of the threads of the mounting bolts due to too much tightening or vibration of the engine.
⚠️ Warning: Do not try to seal cracks in the pan with regular sealant from a hardware store. Motor oil and high temperatures will destroy such a connection within a few days, resulting in loss of oil while driving.
Sometimes the cause of a leak lies in a clogged crankcase breather. If the ventilation system is clogged, excess pressure is created inside the pan, which squeezes oil through the weakest points - the crankshaft seals and the crankcase gasket. Checking ventilation should be the first step in diagnosis.
- Every day
- Once a week
- Once a month
- Only before maintenance
Selection of original pallet and analogues
If it is necessary to replace a part, a dilemma arises: to take the original or a high-quality analogue. Original pallet from Nissan has an ideal selection of geometry and steel quality, but its price is often too high. Part numbers for original spare parts may differ depending on the year of manufacture and engine type, so be sure to check the VIN code before purchasing.
There are reliable analogues on the market from brands specializing in suspension and body parts. Such manufacturers offer steel products of the same thickness, but with improved anti-corrosion treatment. However, always check that the mounting holes are present and that the oil receiver is shaped correctly.
| Manufacturer | Material type | Average price | Features |
|---|---|---|---|
| Nissan (Original) | Stamped steel | 15,000 - 20,000 rub. | Ideal geometry, factory coating |
| Starline | Steel | 4,500 - 6,000 rub. | Budget option, requires anticorrosive |
| Dayco | Aluminium/Steel | 7,000 - 9,000 rub. | Reinforced design, long service life |
| Domestic analogues | Steel | 3,000 - 4,500 rub. | Poor coating quality, risk of corrosion |
If you decide to save money and buy an analogue, pay special attention to surface preparation. Uneven surfaces on cheap pallets may require additional sanding before installation. Pallet It must fit tightly, without gaps, otherwise even the most expensive gasket will not save you from leaks.
☑️ Selecting and purchasing a pallet
Preparation for replacement and necessary tools
Replacing a pallet is a labor-intensive procedure that requires careful preparation. You will need to lift the car on a lift or pit, since access to the part is only possible from below. Be sure to prepare a container for draining used oil with a volume of at least 4-5 liters.
The tools you will need are a set of sockets, a ratchet, an extension and a torque wrench. A sharp scraper and carburetor cleaner are useful to remove old sealant and gaskets. Don’t forget about a new filter and oil, since replacing the pan inevitably involves a complete replacement of the lubricant.
They must be dismantled before starting work. If you have a third-party crankcase guard, make sure it does not interfere with access to the mounting bolts.
Before starting work, warm up the engine to operating temperature (about 80-90 degrees). Warm oil will flow out faster and more completely, carrying small particles of dirt with it.
Step-by-step instructions for replacing the crankcase
First you need to drain the old oil. Unscrew the drain plug located at the very bottom of the pan and let the oil drain completely. If the plug is stuck, use a penetrating lubricant, but be careful not to strip the threads. After draining the oil, remove the oil filter using a special puller or simply by gently twisting it.
Next, unscrew all the bolts securing the pan to the cylinder block. Please note that the bolts may be different lengths, so it is better to lay them out in the order in which you removed them, or take a photo of the diagram. Remove the pan, if necessary, carefully prying it with a screwdriver in the places where the old sealant stuck it to the block.
Thoroughly clean the boss surface on the cylinder block from gasket and sealant residues. This is a critical step: any unevenness will lead to leakage. Use a metal scraper and degreaser. Make sure that the oil pan is not damaged and fits freely into the new pan.
Apply a new coat of sealant to the pan or gasket. If sealant is used, apply it evenly, avoiding getting into the engine. Reinstall the pan and tighten the bolts. Tightening must be done in a certain sequence - from the center to the edges, in order to avoid distortion of the part.
⚠️ Attention: Do not over-tighten the bolts! The thin metal of the tray is easily deformed, which will lead to a leak. Use a torque wrench and the tightening torque specified in the instructions (usually 10-12 Nm).
How to replace the original sealant?
It is recommended to use a red or black high temperature silicone sealant (such as Permatex or Victor Reinz) specifically designed for internal combustion engines.
Quality control and prevention
After installing the pan, you need to fill in new oil and start the engine. Let it idle for a few minutes, carefully monitoring the oil level and the absence of leaks in the joint area. Also check the oil pressure on the dashboard - the indicator should go out immediately after starting.
Inspect the underside of the car after driving. If you notice fresh drops of oil, it means that the sealing was performed poorly and the procedure will have to be repeated. It’s better to spend time redoing it now than to look for the cause of oil starvation after a thousand kilometers.
To prevent corrosion, it is recommended to apply anti-corrosion compounds to the pallet, especially if you are using an analogue with a simple factory coating. Regularly washing the bottom and checking the condition of the protection will also help extend the life of the part. Timely replacement of the pan gasket can prevent major engine repairs costing tens of thousands of rubles.
High-quality cleaning of the contact surfaces and the correct tightening torque of the bolts are the key to the longevity of the tightness of the engine sump.
Owner Frequently Asked Questions (FAQ)
Is it possible to replace only the gasket if the pan is intact?
Yes, if the pan has no mechanical damage or corrosion, it is enough to replace the gasket and apply a new layer of sealant. However, often the pallet is deformed due to impacts, and then replacing the entire part is inevitable.
Which sealant is best to use for Nissan Almera G15?
It is recommended to use red silicone sealants that are resistant to high temperatures and oil. Popular brands: Permatex Ultra Black, Victor Reinz, Loctite 5910.
Do I need to remove the engine to replace the pan?
No, replacing the pallet with Nissan Almera performed from below without removing the engine. However, it may be necessary to remove the subframe or guards to gain access to the bolts.
How often should the pan gasket be replaced?
The gasket does not have a regulated replacement period, but it is recommended to inspect it at every oil change. At the slightest sign of leakage or tanning of the material, the gasket should be changed immediately.
What to do if the thread in the pan is broken?
If the thread in a bolt is stripped, it must be replaced. If the threads in the pan or block itself are damaged, you will need to cut a new thread with a tap or install a threaded insert (shaped sleeve).