03/04/2022 144 540 VAZ 2109
Author: Ivan Baranov
Repairing a cylinder head cannot be called a simple procedure, which requires certain skills and some experience. Repairs require special tools. As a rule, during this work the gasket is changed and the cylinder head tightening torque is adjusted: VAZ 2109 in our case. In order for the adjustment to be performed correctly, you must strictly follow the instructions. With a competent approach, you will successfully carry out the adjustment, achieving the desired result.
The majority of today's cars do not need tightening of the head bolts, but on the VAZ 2109, it is required at least to undergo maintenance.
If moisture begins to accumulate in those places where the block comes into contact with the cylinders, then this is a sure sign that urgent tightening of the bolts is required. Moisture in the above areas is a sign of a lubricant leak. The main reasons for tightening bolts are:
- damage to the cylinder head due to engine overheating;
Cylinder head - loss of tightness of the cylinder head gasket;
- the mileage specified in the instructions has been completed.
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Adjusting the bolt torque
In order to do everything correctly and avoid mistakes, you must strictly adhere to certain rules and follow the order of execution.
Tightening should only be done with a special torque wrench, which allows you to control the tightening torque.
Torque wrench
First, using a torque wrench, set the holder to the zero position. This means that the device data is equal to the moment of the original position. Then, you need to look at the indicator of the device when starting the fastener. Rotating the holder, we monitor the indicators. If the moment has not changed, this means that the fastener can be stretched and this is normal, as it should be. If the torque increases rapidly, bolt movement must be achieved. This indicates low stretch of the holder. This means stabilization is needed.
While the vehicle is running, the bolts that secure the cylinder head are constantly experiencing various impacts. They constantly heat and cool, which over time leads to the destruction of the structure of the fasteners.
For all power units there are specific rules that must be followed during operation:
- Strictly follow the data specified in the practical manual for the VAZ 2109.
- Adjustment is carried out only with a torque wrench. The use of another device will not allow this work to be performed correctly.
- Use only good bolts.
Replacement bolt kit - When starting to work, be sure to check the condition of the holders.
- Strictly adhere to the tightening torque values recommended by the manufacturer.
The most important data regarding adjustments is in the annotation for each specific car. As a result, you must carefully study and adhere to what is written in it. During operation of the vehicle, you must strictly comply with all manufacturer's requirements and systematically diagnose the car. Correct and smooth operation of the VAZ 2109 power unit prevents the need to adjust the cylinder head holders.
Since the cylinder head of the VAZ 2109 is a complex unit, it is necessary to carry out repair work only with absolute confidence in your actions. Strictly observing the order of work. If a deviation in the operation of the motor is detected, immediately carry out diagnostics. This will avoid more expensive repair work.
Required Tools
- torque wrench;
- caliper or ruler.
Tightening diagram
The cylinder head tightening pattern is the same as on traditional models and you need to start from the center. It takes place in four steps.
The diagram according to which the VAZ 2109 should be pulled
- tightening torque 2.0 kgf/m
- tightening torque 7.5 - 8.5 kgf/m
- turn it 90 degrees.
- turn it again by 90 degrees.
To make it clearer, let’s describe this process in more detail:
- Using a torque wrench, tighten the bolts in the sequence shown in the figure to 2.0 kg/cm.
- Then we go around the second circle and reach 8 kgf*m.
- Next, twist it 90 degrees.
- We go around the second circle, twisting another 90 degrees.
Proper lift
Attention! On 16-cl power units, bolts can be reused, but if their length is no more than 95 millimeters.
Otherwise it changes. The length is measured along with the washer. Do not try to replace the torque wrench with another device, otherwise the consequences may be unpredictable.
How to tighten cylinder head bolts
From studying. It is by studying the Repair Manual for your car, preferably the original one. It is there that the manufacturer indicates everything that is necessary to tighten the cylinder head. And you need to know:
- the procedure (diagram) for tightening the cylinder head bolts;
- what tightening torque is required;
- what bolts are used to tighten the cylinder head.
Bolts for tightening the cylinder head are a special matter. The fact is that in modern engines, bolts with special characteristics are used for the cylinder head. So-called “spring” bolts, which, due to their properties, do not require additional tightening after initial tightening at the factory.
Moreover, when trying to tighten the cylinder head bolts, due to the “fluidity” of the metal, they will be pulled out. As a result, you may end up with a broken bolt.
When repairing the cylinder head, it is necessary to install gaskets that do not shrink. This eliminates the need to tighten the cylinder head bolts.
But, if you have already decided that you absolutely need to tighten the cylinder head bolts, then you should do it with the “manual” from the manufacturer and using a torque wrench. Movement to movement, number to number. Amateur performance based on reserve is not needed here.
Tightening the cylinder head and running-in config
The time has come to assemble the engine and the question arose about completing the attachment. Since the engine is new, I had to run it gently for 2000 km at a speed of no more than 3000. I could install all the tuning parts at once (Stingger trapezoid receiver, 56mm throttle, Volga injectors, DBP/DTV and possibly the camshaft) but then I would have to immediately make adjustments to firmware, but there was no desire to do it (as well as the opportunity). And the engine would have lost in the low end, but there would be no way to break it in without them.
Therefore, I decided to assemble it from stock for testing, although of course it is clear that the factory receiver and the sawn head are a so-so combination
