Unlike many modern engines that use chains, a toothed belt is installed here, which loses its properties over time. Replacing the timing belt — this is not just scheduled maintenance, but insurance against major engine repairs. Errors in the selection of spare parts or non-compliance with tension technology can turn an economical car into a source of serious expenses.
Why is it so important to follow the replacement regulations?
The manufacturer claims a certain service life for the belt drive, but actual operation often makes its own adjustments. Engine G15 has a design in which a broken belt causes the valves to meet the pistons, which causes expensive repairs to the cylinder head. Replacement interval is 60 thousand kilometers or 4 years of operation, whichever comes first.
Many owners try to save money and delay replacement until 80-90 thousand kilometers, believing that the belt will hold up. This is a dangerous misconception, since rubber ages not only from mileage, but also from time, temperature changes and the aggressive environment under the hood. Even if the belt visually seems intact, microcracks on the reverse side can lead to its instant destruction at any moment.
Timely replacement allows you to avoid not only replacing the belt itself, but also expensive engine restoration work. Consequences of a cliff on Nissan Almera Classic almost always include bent valves, damaged pistons and the need for cylinder head resurfacing or replacement.
Selection of quality components and consumables
Selecting the right set of spare parts is half the success of the entire operation. On sale are found as original products from Nissan, as well as high-quality analogues from trusted brands such as Gates, Contitech or Dayco. It is important to understand that you need to change not only the belt itself, but also the tensioner rollers, since their bearing often fails before the rubber itself.
List of elements required for work:
- 🔧 Original timing belt or a high-quality analogue marked 13028-AX010
- 🔄 Tensioner roller assembly (catalog number 13070-AX010)
- 🛢️ Oil pump (it is recommended to change when removing the belt if wear is suspected)
- 🧴 Sealant for pan and timing cover gasket
You should not skimp on the roller, as jamming it is tantamount to breaking the belt. Cheap counterfeits often have low precision in the manufacture of teeth, which leads to rapid skipping and disruption of valve timing. Bearing quality roller directly affects the smooth operation and service life of the entire system.
Tools and workplace preparation
Before starting work, you need to prepare a garage with a pit or a lift, as well as a set of specialized tools. Without special devices, it is almost impossible to correctly set the marks and tension the belt. You will need standard wrenches, a torque wrench and specific plugs to secure the shafts.
☑️ Preparation for replacement
It is important to have surface degreasing products and rags on hand. Under the hood Almera Classic It’s quite tight, so it’s convenient to have extended knobs and universal joints for access to the pulley mounting bolts.
Step-by-step instructions for dismantling and installation
The process begins with removing the alternator belt and engine protection. Next, you need to remove the right wheel and wheel arch liner to gain access to the crankshaft pulley. Removing the crankshaft pulley requires keeping the shaft from turning, for which a special device or fixation method through spark plug holes is used.
After removing the covers, you will see marks on the pulleys and engine housing. The key point is to align the mark on the camshaft pulley with the protrusion on the rear cover and the mark on the crankshaft pulley with the notch on the block. Shaft fixation is carried out through technological holes to prevent them from turning when the tension roller is loosened.
Dismantling the old belt occurs after loosening the tension roller bolt. Make sure the marks have not moved. Installing a new belt begins with tension on the crankshaft pulley, then on the pump and tension roller. Belt tension is adjusted by turning the roller until the mark on it coincides with the protrusion on the bracket.
How to properly tension the belt?
For proper tension, you need to turn the roller clockwise until the mark matches. After this, turn the engine two turns and make sure that the marks match and the tension has not weakened. If the marks are separated, repeat the procedure.
Critical errors during replacement
The most common mistake is incorrect labeling. Even one division can lead to incorrect engine operation, loss of power and increased fuel consumption. In the worst case, this will end with the pistons hitting the valves on the first start. Phase check required before installing covers.
- Up to 60 thousand km
- Up to 80 thousand km
- Up to 100 thousand km
- Replacement upon breakage
Another problem is the use of non-original pulley bolts. The crankshaft bolt has a special thread and tightening torque, violation of which can lead to its unscrewing and destruction of the engine. They also often forget to replace the timing cover gaskets, which leads to oil leaks.
Table of tightening torques and specifications
For high-quality assembly, it is necessary to strictly observe the tightening torques of the bolts. The use of a torque wrench is mandatory for critical connections. Below are the basic values for the G15 engine.
| element | Tightening torque (Nm) | Special instructions |
|---|---|---|
| Crankshaft pulley bolt | 103 + 90 degrees | Tighten in two stages |
| Camshaft pulley bolt | 115 | Use thread locker |
| Tensioner pulley bolt | 40 | Control the position of the mark |
| Timing cover bolts | 10 | Do not overtighten to avoid cracking the plastic. |
Checking operation after assembly
After installing all the casings and the alternator belt, you need to start the engine. It should work smoothly, without extraneous noise or vibration. Check for oil leaks around the timing cover. Listen to the tension roller - it should not make noise or whistle.
Before the first start after replacement, it is better to disconnect the ignition coil and crank the engine with the starter several times to make sure there are no obstacles to the rotation of the crankshaft.
If the engine is difficult to start or runs unstable, turn it off immediately and check the marks again. The valve timing may be off. Please note that on a Nissan Almera Classic, if there is an error in setting the marks, the engine may not start at all or may stall immediately.
Frequently asked questions from owners
Is it possible to change only the belt, without the rollers?
Technically this is possible, but it is highly not recommended. The tensioner pulley is a consumable item with a limited resource. Replacing it together with the belt guarantees reliability for the entire next interval, while the old roller can jam after 10-20 thousand kilometers.
How can you tell if the timing belt is worn out?
Visually, you can notice cracks on the inside, delamination of the fabric or worn teeth. However, wear and tear often occurs unnoticed. Therefore, it is better to focus on the mileage regulations, and not just on appearance.
Is it difficult to change the timing belt yourself?
The process requires accuracy and the presence of a special tool for fixing the shafts. If you do not have experience working with timing belts, it is better to entrust this to professionals, since a mistake is very expensive.
Do I need to change the pump when replacing the belt?
The G15 engine has a pump driven by a timing belt. When replacing the belt, it is not necessary to change the pump if it does not leak or play. However, many masters recommend doing this preventively, so as not to disassemble the timing belt again in a couple of years.
Regularly replacing the timing belt on a Nissan Almera Classic is the key to a long engine life and no need for major repairs.