REPAIRING THE CYLINDER HEAD FOR A VAZ 2109 WITH YOUR OWN HANDS
According to many years of experience of various car enthusiasts, replacing the cylinder head of a VAZ 2109 is most often associated with problems arising from the gasket. But there may be others that can cause the engine to overheat or even seize.
Any driver can repair and modify the cylinder head on a VAZ 2109, but special tools and a little knowledge of the operating principle of this unit are required. Recently, tuning of this unit has become more and more popular, thanks to which the power of the car increases. You can do tuning yourself if you have experience in such work. Working with valves and cylinders requires special knowledge and skills.
What is a cylinder head
Cylinder head for VAZ 2109 in disassembled condition
The VAZ 2109 cylinder head is a special unit whose main purpose is to close the cylinders. It is attached directly to the block itself using special bolts. The cylinder head is important because it is a direct participant in numerous processes during engine operation. The cylinder heads of power units of cars produced today are distinguished by a rather complex structure and are assembled from a significant number of parts.
When is it time to change?
- There may be a need to replace or repair the cylinder head if you begin to notice that fuel consumption has increased or the power of the power plant has decreased.
- Incorrect assembly and installation of valves and cylinders can also lead to malfunctions in the cylinder head system.
- If you constantly fill your car with low-quality gasoline, then do not be surprised that over time this system will begin to malfunction and will need to be repaired.
- A crack that appears in a block cannot be eliminated in any other way than by completely replacing this element.
- A symptom indicating problems in the cylinder head may be white smoke coming from the exhaust pipe, this is caused by antifreeze getting into the engine cylinders.
White smoke from the exhaust pipe
- If oil stains appear on the surface of the coolant in the tank, this also indicates that repair of the unit is necessary. This is due to the fact that oil, in one way or another, began to get to places where it should not be.
- Not often, but sometimes exhaust gases begin to break through the gasket. There is no other choice but to dismantle the head and replace the gasket.
- Removing the head may be necessary in the case of VAZ 2109 tuning, modifications, problems with plugs, tightening bolts or boring cylinders.
Signs of a broken gasket on a VAZ 2109
There are no regulations for replacing the gasket, since a good and well-made part can serve for quite a long time until the head is dismantled. But it is necessary to monitor its condition, and the difficulty is that damage to the gasket rarely manifests itself externally. Oil drips and antifreeze drips may not always indicate gasket damage. But there are a number of unconditional signs that the gasket needs urgent replacement.
- Suspension in the engine crankcase. This is determined by checking the oil level. Instead of clear or even dark oil, a watery, dark brown suspension appears on the control dipstick. The coolant can be forced into the lubrication system, where it mixes with the oil, but the mixture may not be homogeneous and looks like a suspension. The first sign of antifreeze leakage into the crankcase is an increasing oil level.
- Oily spots in the coolant expansion tank. The same story - oil got into the antifreeze, but it cannot dissolve there, so it looks like stains on the surface. This is also a signal that the gasket is broken.
- A drop in compression in a particular cylinder or in two adjacent ones. Most often this happens when the gasket is simply of poor quality and burns out in the place where the cylinder is sealed. It can burn out anywhere, along the perimeter of the combustion chamber - both outside the block and into the channels. External burnout can be heard immediately by sound. Therefore, such a nuisance must be eliminated immediately.
Stages of work
As we have already said, the replacement process is not complicated, but if you decide to take on it for the first time, then it is better to invite someone with experience in this matter to help. You may also need help if you decide to improve the performance of the VAZ 2109 engine by tuning it using channel boring. Replacing the plugs also requires additional assistance. In this case, removing old plugs and correctly installing new ones requires certain skills.
Tools
- hexagon;
- torque wrench;
Torque wrench
- knob;
- screwdriver.
How to correctly stretch the cylinder head of a VAZ 2109
All subsequent work of pulling the fasteners and the completed correction and installation of the cylinder head is done with a torque wrench.
On a note! Every car owner and simply a connoisseur of domestic cars must have a special device for diagnosing a personal vehicle.
You can also do the following using a special scanner:
- Set up the car's on-board computer
- Analyze sensors
- Reset
- Perform reading
A torque wrench is a specially designed tool. It is used to tighten the cylinder head bolts on the internal combustion engine.
Torque wrench
In addition to a special key, you need to take a ruler and a compass.
Process
Before proceeding with the removal and repair of the VAZ 2109 cylinder head, it is necessary to carry out some preparatory work in accordance with the order.
Removal
- First of all, remove the air purifier housing.
- Disconnect the hoses and wires from the carburetor or injector.
- Next, you need to disconnect the pants from the manifold.
- We remove the distributor.
- Unscrew the valve cover.
- Remove the carburetor and manifolds.
- To unscrew the head bolts on a VAZ 2109, you will most likely need a wrench and a hexagon, because the bolts are tightened with decent force.
Pipe as a lever
- Remove the head mounting bolts and washers.
We take out the bolts
- We remove the VAZ 2109 cylinder head from the power plant unit.
- We remove the gasket.
Gasket that has expired and needs to be replaced
- Also, if necessary, we carry out repairs or modifications to engine block components.
Tuning
Qualified adjustment, modification and tuning of the VAZ 2109 head will help to fully reveal the capabilities of your power unit. You've probably heard a lot about this, read or even watched videos on the Internet. Typically, when tuning, the channels are bored and smoothed, thereby reducing the turbulence that reduces power. The valves are changed to larger ones and ground into the seats. Tuning may also involve replacing standard valve guides with bronze ones.
Valve lapping
Lapping control is carried out as follows:
- the assembled head lies on its side;
- liquid is poured into the collector holes (ordinary water can be used).
If the liquid does not flow through the valves, this means that the work was done efficiently and the valves were ground in correctly. After all faults have been eliminated, you can begin installing the head.
Installation
- Begin assembly by installing a new gasket. Attention! The holes in the gasket must coincide with the guides, which are located at the corners of the block.
New gasket
- You need to install the head carefully, do not move the gasket from its place at this moment.
- We insert the bolts into their places and begin tightening with a torque wrench.
Tightening with a torque wrench
- Next, we install the dismantled equipment, injector or carburetor, in reverse order. Fresh coolant is added. Wires and hoses are connected.
Attention! This operation requires some knowledge and skills. Therefore, before performing it, you should know that the bolts need to be tightened according to a certain pattern and with a certain force. It would be useful to read additional material on this topic and watch video instructions.
How is the tightening torque of VAZ 2109 bolts adjusted?
If it is necessary to tighten the cylinder head of a Nine engine, it is important to observe not only the strength and degree of tightening of the bolts, but also other conditions. Below we will look at how to correctly stretch the cylinder head on a VAZ 2109.
What will you need?
The procedure for tightening fasteners after removal and repair, as well as when installing the cylinder head, is carried out exclusively with a torque wrench.
A dynamometer is a tool designed to tighten the cylinder head screws of various engines.
In addition to the key, you will also need a caliper or a regular ruler.
User Marat Ibatullin made a video in which he clearly showed how the task of tightening the screws is performed.
Scheme of work
The order of tightening the bolts on cars with an injector or carburetor engine is determined by the manufacturer and is indicated in the service book for the car. According to the diagram, the pulling procedure begins with the central two cylinder head bolts.
The cylinder head bolts must be tightened as follows:
- First, you need to twist the screws with a force in Newtons of 2.0 kg/cm.
- Then the bolts are tightened to a torque of 7.5-8.5 kg/cm.
- After this, all screws must be tightened 90 degrees.
- At the end, each bolt is rotated 90 degrees again.
How to tighten the head screws of a VAZ 2109 block with your own hands:
- The torque wrench holder is placed in the zero position. This indicates that the instrument data corresponds to the moment of the initial position.
- Evaluate the indicators on the key before starting the tightening procedure.
- The tool holder can now be rotated. Monitor the readings as you complete the task.
- If it happens that the torque does not change during tightening, then the head mount may be stretched. This is quite normal, as it should be. First, use a wrench to tighten the screws to 2 kg/cm. Follow the tension sequence shown in the diagram.
- At the next stage, the covering is performed again in the same sequence. Only now the bolts need to be pulled to approximately 8 kg/cm.
- At the end of the procedure, the screws must be tightened once 90 degrees in a circle, and then again 90 degrees.
Channel RUS13 in its video showed how to install the cylinder head on a VAZ 2109 engine and tighten the bolts.
Tightening rules
What nuances should be taken into account when carrying out this procedure:
- Observe the appropriate tightening torque for the VAZ 2109 cylinder head.
- The use of wrenches and other tools is not allowed, since the degree of tension can only be determined using a dynamometer.
- To perform tensioning, only working screws are allowed. The bolts must meet the requirements of the power unit installed on the machine.
- Before completing the task, make sure that the holders are in good working order.
- If the cylinder head has been replaced or repaired, then the old bolts cannot be used for tension; new ones must be purchased. On sixteen-valve power units, it is allowed to re-use screws to fix the block head, but only if the length of the parts is no more than 9.5 cm. It is necessary to measure the length of the screw only with a washer. If the bolts are larger than 9.5 cm, they must be replaced.
- If the vehicle is equipped with an aluminum head, then the cylinder head is fixed with TTU type screws. They cannot be tightened because they are screwed into a thread with a certain degree.
- When purchasing a cylinder head gasket, you need to pay attention to the manufacturer's specifications. They often prescribe a certain tightening ratio required for specific gaskets. Please note that the indicated moment of force should not diverge much from the one applied during the work process.
- In power units equipped with aluminum cylinder heads, the tightening procedure is carried out on a cold engine. As for cast iron engines, in such internal combustion engines it is necessary to perform the tightening while it is hot.
