One of the most important components in the engine is the timing system. Today, manufacturers are increasingly moving to a belt drive. However, many domestic cars are still equipped with a gas distribution mechanism. Chevrolet Niva is no exception. The manufacturer recommends replacing the timing chain on the Chevrolet Niva every 100 thousand kilometers.
There are also indirect symptoms. This is an increased fuel consumption and increased noise of the internal combustion engine. This car is quite simple, so you can do the timing chain on a Chevrolet Niva with your own hands. How to do this - consider in the article.
Features
It must be said that replacing the chain involves partial disassembly of the engine. therefore, for those who have not yet had the experience of self-repairing a car, this procedure may seem unbearable.
Some replace the timing chain on the Chevrolet Niva without removing the front cover. But this is not recommended, because you need to change the gears of the drive. Since the teeth have wear, they will not interact well with the new chain. In addition, chain tensioners must also be changed.
What do you need to prepare?
In order for the replacement of the timing chain at the Niva Chevrolet injector to be successful, you need to prepare:
- a special key for the crankshaft pulley nut, some make such a device on their own - take a balloon wrench for cargo wheels (32 by 38 millimeters);
- heads of different sizes (from 8 to 22);
- candle key;
- pliers;
- clean rags;
- hammer;
- minus screwdriver;
- key for brake pipes.
We will also need new details:
- the chain itself;
- three gears (for camshaft, crankshaft and oil pump shaft);
- front crankshaft oil seal;
- valve timing chain tensioner and tensioner ;
- gasket for timing case cover and water pump.
Getting to work
So, we have all the necessary materials and tools. First of all, you need to install the car on the handbrake and put counter-wheels under the wheels. It is advisable that the car is in a pit.
Next, remove the engine and gearbox protection (if any). Then you need to prepare a container for draining antifreeze and dismantle the radiator along with the fans. If you are replacing the timing chain on a Niva Chevrolet with air conditioning, you also need to drain the refrigerant from the system. Some do not drain it, but simply carefully take the radiator blocks to the side. The shutter control actuator then shuts down. The air filter housing is removed. The crankshaft sensor is removed.
It is necessary to loosen the generator mount and remove the auxiliary drive belt. Then the bypass and tension roller is removed. The top camshaft cap is pulled out. From above, the engine must be covered with a clean rag so that debris from the street does not get inside. Next, with a negative screwdriver, unscrew the lock washer and tear off the head with a 17 bolt. Unscrew the mount of the water pump. The latter also needs to be removed. To remove the front cover, you need to unscrew the seven bolts around the perimeter and two more on the top. After that the generator bracket bolt is unscrewed.
What next?
The car is installed in fifth gear. Using a 38 mm special wrench, the nut on the crankshaft pulley is torn off.
Unscrew the candles and make marks on the crankshaft, as well as on the camshaft gear. Then the pulley is dismantled and the fastening of the lower frontal cover is unscrewed. They are located on the engine sump. The two damping fixing bolts are unscrewed. The latter is removed too. The latches of the gears of the oil pump are unbent. Next, the bolt is unscrewed with a head at 17.
The oil lines are removed from the tensioner by means of a brake pipe wrench. Then you need to unscrew the nut of the low oil pressure sensor from the tee. To do this, you need a key at 22. This procedure is necessary when using the tensioner "Pilot".
Using a candle key, the tee is removed and a pressure sensor is installed in return. The key 10 unscrews two tensioner nuts. The latter is removed from the place. Gets the top nut. It can be reached with pliers or a pipe wrench.
At the next stage, all three gears, as well as the chain, are dismantled. An old crankshaft oil seal is removed with a screwdriver. It is necessary to carefully wipe the gland seat from dirt.
It will take a clean rag. It is also advisable to wipe the lid. After these procedures, a new oil seal is pressed in. To make it go easily, you will need to pre-lubricate the elements with oil. An old stuffing box is used as a mandrel (so that the part evenly enters the hole).
Install a new tensioner shoe. In this case, a minimum clearance between the bolt and the housing must be ensured. The tensioner should normally walk along the bolt, while not loosening. Only in this way is the correct tensioning of the timing chain possible.
The gears of the oil pump and crankshaft are put on. In this case, do not forget about the installation of lock and distance washers. The lock washer spike should be bent at right angles. After tightening the bolts. If the spike hardly enters the gear, it needs to be slightly sharpened.
The gear is put on the camshaft. The marks on the back of the gear should match those on the head. A new damper is mounted and the crankshaft is set to the top dead center position. There is a label for this. It is located opposite the keyway.
The new chain is wetted with engine oil before installation. You must be able to wear it properly. The chain is put on from the crankshaft, then passes through the oil pump and goes to the camshaft. This installation scheme will ensure uniform tension. In this case, only the oil pump shaft can be rotated.
The tensioner is installed. The sealing surfaces must be greased with sealant. In this case, the hole that is in the tensioner housing (a spring is visible in it) should be upward.
How does the installation continue?
The next step is to check the degree of chain tightness, as well as the coincidence of the labels. It is necessary to pull out the check from the tensioner. The shaft is rotated a few turns to make sure that the marks match. Bolts of fastening of gear wheels of the pump and a camshaft are tightened, then stoppers are bent. Mounted front cover. At the same time, mating surfaces and gasket are lubricated. Fastening nuts are baited and the generator bracket is placed. The pulley is installed in place, the cover fastening bolts are tightened, the valve cover is on top.
How is the timing chain replaced on the Chevrolet Niva? At the next stage, experts recommend checking the condition of the tension rollers and the drive belt of auxiliary units. In the presence of defects (noise during rotation in the first case and breaks in the second), the elements change.
Then a pump with a new gasket is mounted. The pulley nut is tightened with a 38 mm special wrench. A belt is put on and all the connectors that were removed earlier are attached. How is the timing chain replaced on the Chevrolet Niva? A radiator is put in place, antifreeze is poured. All remaining parts are installed.
Test
After these measures, the engine is started. if the motor starts normally, it must be warmed up to operating temperature. Next, plug it and check for coolant leaks. If you replaced the timing chain tensioner on a Chevrolet Niva with air conditioning, you need to charge the refrigerant additionally.
note
If you are replacing the timing chain on the Chevrolet Niva with a two-row one, it is important to check the ignition installation. It is exhibited on the crown on the flywheel of the internal combustion engine. On the crown there is a site without one tooth.
If the piston of the first cylinder is at TDC, this section should be located at the bottom. In this case, the 20 tooth when counting counterclockwise is opposite the DPKV.
Conclusion
So, we found out how the timing chain is replaced on the Chevrolet Niva. This operation has many stages, but if everything is done sequentially, the work will be performed efficiently.