DIY cylinder head repair 8 valves

In detail: do-it-yourself cylinder head repair of 8 valves from a real master for the site my.housecope.com.

The cylinder head is a cover designed to enclose the cylinder block. It is also indispensable for some other functions that are no less important in the operation of the vehicle's power plant.

During operation of the engine, an air-gas mixture is supplied to the head itself, and exhaust gases are removed thanks to the exhaust manifold.

The cylinder head is a fairly durable working unit, so it does not need to be repaired or completely replaced so often. On cars manufactured in the territory of the Russian Federation, the cylinder head has to be removed due to cylinder leakage or when the gasket is worn out.

And sometimes the cylinder head is removed for rework. Removing this unit on a vehicle with any number of valves is fairly easy, although some skill may be required.

In this regard, if you needed to remove the cylinder head yourself for the first time, then it is best to do this under the control of a person who has previously faced a similar task.

In order to repair or replace the cylinder head, you will definitely need some tools that are not so often found in a novice car enthusiast. Namely:

A set of keys.
Screwdriver.
Torque wrench.
Socket heads.
Torx.

Disconnect the negative terminals from the storage battery.
The piston of the first cylinder is set to the top dead center position.
All the coolant is drained off.
The fuel pressure decreases.
The exhaust pipe is disconnected from the manifold.
The cylinder head cover is being dismantled.
All pipes, electric wires and hoses are removed. But before doing this, you need to remember or note what and where it was originally connected. This is done in order to avoid possible confusion during reinstallation.
There are three bolts on the camshaft belt cover that must be unscrewed and the cover itself removed.
The timing belt is removed and completely retracted.
It is imperative to secure the shafts against possible rotation.
The pulley is attached to the camshaft with bolts that must be unscrewed and then removed.
The nut securing the rear camshaft cover is unscrewed.
Unscrew the remaining screws and completely remove the cover.
Slightly loosen the tension of the ten bolts holding the head.
Then each individual bolt is unscrewed in turn and removed along with the washers.
The head is released and removed.
If the head is attached directly to the gasket, insert a screwdriver or any other long tool. Further, this tool must be used as a lever in order to slightly raise the head, and then completely remove it.
Very carefully, so as not to scratch the surface of the head, it is necessary to remove the remnants of the old gasket. It is best to use a special liquid for this.
We put a new gasket in place.
We make sure that the shafts are in the top dead center position, and all valves on the first cylinder are completely closed.
We put back the bolts.
Using a torque wrench, start tightening the bolts one by one.
We put in place all the removed equipment.
We adjust the valve drive clearances and tension the camshaft belt.

Video (click to play).

As you can see, repairing the cylinder head on a VAZ-2114, which has 8 valves, is a fairly simple, albeit slightly laborious task, which means that everyone who has at least a little idea about this unit can cope with it.

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The internal combustion engine is the main unit of any car. Malfunctions associated with its operation directly affect the functionality of the vehicle. We invite you to find out how the VAZ 2110 cylinder head (8 valves) is being repaired, what is needed for this and watch a video of the process with your own hands.

The cylinder head is one of the main components of the machine. What role does it play? Its purpose is to control the combustion of fuel in the engine, as well as to remove the exhaust gases.

VAZ 2110 car with internal combustion engine 16 valves

As the name suggests, the cylinder head is the engine cover. This element is fixed to the block with large pins. Tightening the pins is one of the main procedures that determine the performance of the motor, but we will not consider this process.

Even an experienced specialist will not give you the answer to this question. This is because if certain elements fail, the cylinder head of the motor of 8 or 16 valves is repaired, and not replaced.

The only reason for replacing the head can only be its deformation, which does not allow the unit to be adjusted correctly.

In addition, these may be cracks that, for one reason or another, cannot be eliminated. In all other cases, the unit is being repaired.

Disassembled cylinder head VAZ 2110

Leakage of engine fluid from an internal combustion engine of 8 or 16 valves is an important symptom in which the cylinder head needs repair. Typically, fluid leaks from under the plug. It is located directly on the cylinder head at the rear of the engine. Usually the cause of the leak is a worn O-ring.

In order to replace the plug, it is necessary to unscrew three bolts from the studs.
Having done this, the sealing rubber can be removed from the installation site.
It is better not to use gaskets of domestic production, since their quality leaves much to be desired. In order to protect yourself from having to replace the ring again, it is better to use a sealant. For added convenience, the sealant can be filled into a medical syringe.
Squeeze some sealant into the plug location. Wait five minutes, then reinstall the new gasket, and then install the plug.

The request returned an empty result.

If it really happened and you have to do not repair, but replace the cylinder head 2110 8 valves, and you do not have the skills to carry out such repairs, then our instructions will come in handy:

This material provides instructions for dismantling and disassembling the cylinder head of VAZ 2111 and VAZ 2110 cars.

Let's start by defining the concepts. The cylinder block of a modern car is the basis of the engine, on which the rest of the engine components are installed: cylinders, crankshaft, oil pan, cylinder head.

It is precisely the malfunctions and repairs of the cylinder head that we are interested in. Is it possible to repair the cylinder head with your own hands in a garage-home? And craftsmen answer unequivocally - yes, repairing the cylinder head with your own hands is possible.

Let's start by clarifying that repairing a cylinder head is a complicated operation and will require from you: a little bit of understanding of the block device, the presence of a special locksmith tool and the ability to own it.

Basic tools required for cylinder head repair

Mandrel for pressing in valve stem seals.
Micrometer for measuring valves and guide sleeves.
Reamer for unrolling new bushings.
Mandrel for pressing out bushings.
Mandrel for pressing in bushings.
Devices for drying valve springs.
Set of countersinks for the restoration of valve seats.
Electric hotplate for heating the cylinder head during troubleshooting and before pressing the bushings.

Do not forget about the necessary spare parts and tags

As a rule, almost any repair of a cylinder head requires its dismantling. Exceptions are, for example, replacement of valve stem seals. Therefore, before starting to dismantle the cylinder head, think about purchasing the necessary set of spare parts.

Today's market provides Head Sets (or, in simple terms, upper sets), which include a cylinder head gasket and all the oil seals and gaskets located above the main gasket.

Well, the tool and the minimum kit are ready, we start troubleshooting the cylinder head.

Before dismantling, be sure to check the relative position of the crankshaft and camshaft according to the marks. Up to the point that we put additional marks on our own. Image - DIY repair of cylinder head 8 valves

For specific car models, the technology for dismantling the cylinder head is described in the manuals. But the peculiarities of some operations are worth recalling.

We loosen the head mounting bolts from the middle by 0.5-1 turn, alternately. The bolts with internal slots must first be cleaned of carbon deposits, otherwise a loosely inserted key threatens to break off and problems during dismantling;
when dismantling the cylinder head, if there is no connection diagram for all kinds of vacuum tubes, then you need to sketch this diagram yourself, having previously applied the appropriate marks.
When removing the valve springs, use dryers, not the “strong hammer” principle.

Cylinder head condition monitoring

Basically, there are not many basic parameters in the cylinder head that need to be checked before you start repairing the cylinder head. So let's start looking for typical cylinder head malfunctions.

The lower plane of the cylinder head... It is checked using a straight edge and a set of probes. The ruler is placed along the diagonals of the head on a plane and the thickness of the gap is determined using a feeler gauge. If the clearance is more than the maximum allowable clearance of 0.05-0.06 mm, then grinding of the cylinder head is required.

Worn camshaft journal journals and bearings... All diameters are measured with a micrometer and compared with the maximum permissible values for a particular engine model. Based on the measurement results, a decision is made on the type of repair or replacement of parts. Do not forget to visually assess the external condition of the surfaces. They should not have obvious signs of mechanical damage: scratches, chips, scuffs, grooves, etc.

Wear monitoring of valve stems and bushings... It is made with a micrometer at several control points of the rod around the circumference. The valve is changed if the difference in diameter exceeds the maximum permissible parameters specified by the manufacturer.

If you do not have such a device as an internal gauge to determine the wear of the guide bushings, then it can be determined by the valve play (new) in the bushing. As a rule, bushings are replaced with new ones.

Wear of such parts, like: saddles, levers, rocker arms, cams are determined visually. If the chamfer on the valve is "failed", but the rod is in order, then it is processed, and the valve can be reused.

Other cylinder head defects can also be identified visually. The presence of burrs and serifs on the surface of the block head is eliminated by grinding the cylinder head to eliminate the leaky connection between the cylinder head and the block itself.

Thus, we carry out the repair of the cylinder head simultaneously with the troubleshooting, as they say, as soon as troubles arrive.

Good luck with DIY cylinder head repairs.

It's no secret that a well-repaired cylinder head is a guarantee of stable, trouble-free engine operation with maximum power output and normal fuel consumption, therefore repair of the VAZ cylinder head should be done with special attention, since any oversight can lead to damage to almost all parts of the engine and new expensive repairs.This article will describe in detail the repair of the VAZ cylinder head with your own hands, tips are given that are not in the books.Since any repair begins with the removal of the part being repaired, we will briefly describe it. In order not to forget, and not to be surprised when disassembling, it is necessary to drain the coolant from the engine before starting the repair. To remove the cylinder head, you first need to remove the air filter, carburetor, having previously disconnected all wires and hoses from it.
After all this has been done, remove the cylinder head cover, align the marks on the crankshaft pulley with the mark on the camshaft drive cover and the mark on the sprocket or pulley (in the figure below, the asterisk) of the camshaft with the mark on its body. Image - DIY repair of cylinder head 8 valves

On the left is shown the installation of the crankshaft mark. On the right is the installation of the camshaft mark.

Then you should loosen the chain tensioner, unbend the camshaft sprocket bolt lock washer, unscrew the bolt (preferably with a jerk), carefully remove the sprocket from the camshaft and tie it with wire or something else to the chain. Now you can unscrew the camshaft nuts and remove it together with the housing. The next step is to remove the rockers, for this they must be pulled off the adjusting bolts and removed from the springs. Before removing the rockers, you need to mark with a marker or notches, so that each one sits in its place during assembly, then the running-in with the camshaft journals and the heads of the adjusting bolts will not be disturbed. Now you need to disconnect the wires from the spark plugs, from the coolant temperature sensor, disconnect the hoses from the cylinder head, unscrew the nuts securing the front pipe to the exhaust manifold and remove it. Next, unscrew the bolts with which the head is attached to the block. The cylinder head can now be removed for repair.
After removing the cylinder head, for the convenience of further work, its surface must be washed from all kinds of dirt and carbon deposits.

Repair of the VAZ cylinder head begins with drying out the valves. For this, the tool shown in the figure below can be used.

Valve Dryer

It is advisable to put the valves in their places or mark them so that in case of slight wear you can put everything in place. Now you should carefully inspect the cylinder head for cracks, pits, potholes, corrosion, assess the wear of the seats and guides, the latter usually have to be changed after about 150-200 thousand kilometers. If, as a result of the inspection, no defects were found that could interfere with the repair, then you can continue.

So, if the guide bushings are worn out, then we proceed to replace them, they can be removed using a special device, the drawing of which is shown below.

Mandrel for knocking out the guide bushings

It is advisable, when pressing out the bushings, to immediately measure their outer diameter with a micrometer and write down, so that when buying new ones, go to a car shop with the same measuring tool and pick up a diameter of 0.05-0.07 more than your family. pressing them in, for this we need: an electric stove, a mandrel for pressing the guide bushings, shown in the figure below, a hammer, machine oil.

Mandrel for pressing the guide bushings

We put the head of the block on some kind of stand along the edges, tuck the tile under the place where we will work, heat it up to 100C, while heating is on, grease the bushings with oil (or even better, put them in the freezer before that), remove from the stands and drive in there new guides. If these requirements are met, the bushings will go "like to their home" and you will not spoil anything.After replacing all eight, it is necessary to let the head cool down and then expand the inner diameter under the valves so that they do not dangle, but move freely, do not jam or jam, otherwise the entire head repair may go down the drain. [Reklama3]

I want to warn against a mistake that many make when working with a sweep: with this tool they work only in one direction with a passage to the end. In no case try to unfold the guide from both sides, this will not lead to anything good!

Now you can start the most painful work, the good performance of which largely determines the tightness of the valve to the seat and the entire cylinder head repair - countersinking. Usually they work with this tool in the following sequence: first, they pass the output cutter (the one on which 60 degrees is written) until the metal layer begins to be removed in a circle, then they take 120 degrees and cut it off until a clear round edge appears ... The last one, the one that is 90 degrees, all that remains is to make a working chamfer, the thickness of which should be 1.5-2 mm, it is advisable to make about 1.5, because when the valves are lapped in, it will increase slightly. A well countersunk saddle should look something like the illustration.

Repair of the VAZ cylinder head - View of a properly shaken saddle

Now it remains to grind the valves so that they fit as tightly as possible to the seats. This is done as follows: go to a car store, buy a special lapping paste (it is quite inexpensive), smear the valve on it, insert it into the head. Further, there are 2 ways of how to rotate it, while pressing it against the saddle: one is "old-fashioned", the other is more modern.
Let's start with the grandfather's. Find a piece of hose of such a diameter that it fits snugly on the valve, squeeze it between your palms and begin to rotate it in one direction or the other. A more modern device for holding the valve is shown in the figure below, it is not difficult to make it.

Tool for grinding cylinder head valves

An external indicator that the valve has rubbed in is the matte surface of the seat and valve at the point of contact, and it should be in a circle, not interrupted. After repair, the tightness of the cylinder head can be checked by pouring a little kerosene or gasoline into the intake and exhaust manifolds. With a well-performed work on the repair of the cylinder head, leaks and dampness from under the valves of the cylinder head are not observed for 5-7 minutes.
Finally, I can only remind you, do not forget to put the valve stem seals. And yet, do not forget to rinse and clean all the parts after repairs immediately before assembling the head, then the motor of your VAZ will last for more than one hundred thousand kilometers.

How to wash the cylinder head from carbon deposits? How to clean carbon deposits from block head valves?

If you are in a hurry, then you should first clean off the carbon deposits as much as possible with some object, the main thing is not to scratch the cylinder head, and then wash off the residues with a carburetor cleaning fluid, while walking with sandpaper similar to a piece of felt, this is sold in car dealerships, it is also similar the one used to clean the pots, usually on one side of the sponge.
And if there is time, then pour the solvent into the not yet disassembled head and leave it for a day, after that it is possible to clean the carbon deposits with the help of an ordinary molar brush, as if the oil is washed off.

author, tell me in what sequence to stretch the head of the block?

the cylinder head bolts are pulled in the sequence shown in the figure

is it possible to make a cylinder head if the rails are loose?

Can. But that will take a lot of shopping bustle. They sometimes contain repair guides for cylinder head valves. Here they can fit perfectly into your block head. Another option is to buy defective guides with a large outer diameter, this also occurs.I will give figures from the practice of repairing such a head from the Ural motorcycle. The diameter of the normal guide is 13.1 mm, I went through a lot of such bushings in the store and found it with a diameter of 13.3 mm. I went in perfect. So be guided by the search for a guide that is larger than the standard one by 0.15-0.2 mm. Do not forget to be sure to heat the head before pressing in the sleeve and grease the guide with oil and put it in the freezer, then it will come in even easier.

what is the pressure in the cylinder of the VAZ 2107?

Normal compression in the cylinders of VAZ cars is 11-12 atmospheres. You can check with a compressometer on a warm engine, with the spark plugs turned out and the throttle valve open (press the gas pedal all the way).

is it possible to change the valves on a VAZ 2106 without removing the block head?

No, this is not possible, because even if you pull the pistons out of the block, the cylinder head valves will still not come out completely and will rest against the cylinder walls. And in general, is it worth it to scoff at yourself, it is easier to remove the head, the more the valves need to be ground after replacement.

The design of any internal combustion engine, including VAZ 2109 8-valve engines, provides for the following components:

The combustion chamber;
Valve mechanism;
Cast lines;
Exhaust manifolds;
Intake manifolds.

If you perform boring and correct the current state of the manifold and cylinder head channels, you can increase the cylinder filling ratio, which leads to an increase in engine output and power. It is not uncommon for the revision to be performed as the final stage to increase the volume of the internal combustion engine.

Modification of the cylinder head is carried out to achieve the following goals:

Increase the diameter slightly;
Remove defective casting areas;
Correct fillet radii;
Polish the channels.

The geometry of the collectors, together with the cylinder head lines, changes during the revision process. If the work is done incorrectly, you can not only fail to achieve the desired increase in power, but also lose the efficiency of the motor, lead to its rapid wear and tear.

To complete the boring procedure for the cylinder head channels, you will need:

Ball cutter corresponding to the required bore diameter (29, 31, 32 mm);
Sandpaper;
Cones;
Drill;
Calipers;
Smaller hose than bore.

To modify the collectors, it is necessary to complete two main stages of work.Obtain the required channel diameter by milling the collectorsPolish the tract with special tools and devices. To do this, you need to attach medium-grain sandpaper to the hose, and attach the hose to the drill. Due to the rotation of the nozzle inside the bore, the desired effect is achievedWhen performing this operation, the most important thing is to maintain the standard location of the axis of the channels and the shape of the section of the flow path.When modifying collectors, there are a few important rules to follow.

Before starting to bore the cylinder head manifold, be sure to accurately determine the location of the manifolds in relation to the cylinder head. To do this, you need to install a pair of pins.

The diameter of the opening of the inlet pipeline can be made less by 1-1.5 millimeters than the diameter of the counter windows in the head. Largely because of this, many owners of the VAZ 2109 refuse to bore the collectors.

The exhaust manifold openings in diameter can be equal to or larger than the diameter of the cylinder head mating paths by 1-1.5 millimeters.

It is extremely important to ensure that the channel bend is as smooth as possible and the corresponding curvature dimensions are observed. The surface on the intake ducts should be slightly rough to facilitate good evaporation of gasoline from its walls. The outlet channel can be polished to a high shine. The channel section should not have a round shape, it has a slightly elliptical shape.
When performing an increase in the channels, it is important not to overdo it, you need to know the measure, since there is a possibility of touching the cooling channel or the oil channel. The cylinder head on classic engines allows you to increase and expand the channels, while on 8-valve VAZ engines, problems are inevitable.

Before you directly engage in the boring of channels, you should find out where to start this process - from a collector or a gas cylinder head. If you need to significantly increase the diameter of the valves, then it is better to start from the area where their walls are thinner. This will reduce the risk of accidental opening of the channels the next time you align. The parts of the bushings that protrude into the channels also need to be modified so that they do not interfere.

As a rule, they need to be either shortened or sharpened. There are situations when the bushings are grinded against the valve wall. Some motorists consider this method to be the best in terms of benefits, although, in practice, rarely does anyone do this, since it significantly reduces the resource of the guides. Correct modification of the valves is possible only under two conditions: experience and following the instructions.

Valve redesign is to reduce weight and increase flow. To lighten the valve, it must be reground or reground. Excess metal will then be removed from both sides. The valve stem is also being reworked - it needs to be narrowed. You can also choose the option without replacing the bushings, in which case you need to make the leg thinner all the way from the guide bush to the plate. A special result can be achieved by reducing the diameter of the stem. For example, reducing the leg from eight to seven mm helps to reduce the mass of the rod itself by 20%, increases the throughput (this is in 8-valve motors).

In reality, the valves are made of an alloy of titanium and aluminum and therefore have amazing lightness, which is combined with some unpleasant moments: high cost and fragility. Given this fragility, strong recommendations are made for valve springs and valve seats. The springs can be left at the factory or slightly loosened. It is advisable to change the saddles to others made of bronze.

The revision of the cylinder head also implies a change in the shape of the combustion chamber. In this case, three areas of work can be distinguished:

Reduced knock
Improvement for cylinder filling
Fulfillment of the conditions for optimal distribution of the mixture in the combustion chamber.

Detonation puts a heavy load on pistons and rings. It can be determined by the level of metallic sounds that propagate through the car engine. The sources of this phenomenon can be the most distant parts of the combustion chamber from the spark plug. It is solved like this:
· It is necessary to reduce to a minimum the work in the combustion chamber, which increases the spread of combustion.
· The number of compressor stations should be minimized. These areas include camera corners and sharp edges. To do this, you need to smooth the surface as carefully as possible.

The last two executions to improve the shape of the combustion chamber are very difficult to do on your own, since you need to have excellent knowledge in the field of physics.

The revision of the cylinder head is not quite complicated at some stages and is a fully justified procedure. Correct modification will increase the power of your vehicle's engine.

In the video, the auto mechanic talks about the nuances of the correct boring of channels in the manifold for the modified head.

Redesigning and upgrading cylinder heads is a great way to increase the power as well as the efficiency of your powertrain. In order to independently prepare the head for increased power, you need to do a lot of work, mostly manual.

To do this job you will need:

1. Manual high-speed polishing and processing machine, equipped with multiple grinding heads and scrapers;

So, here is the actual instruction for modernizing the cylinder head. Remember that to carry out this work, you must have enough experience and dexterity.

1. Install inlet rework valves that are the same angles, the same width, and are perfectly round. It is necessary to chamfer and remove sharp corners from the bottom of the intake valve.

2. Then work the inlet around the valve guide to reduce air / fuel flow obstructions, both in width and height.

3. Now you need to find a kind of protrusion in the area of the inlet valve seat, just below the seat itself. This area also needs to be carefully handled.

4. The holes of the inlet valve must be machined to make it trapezoidal rather than rectangular; it is not recommended to remove metal from the bottom of the channel.

5. Above all, a rough sanding of the entire inlet must be done with a 100 grit sandpaper.

In order to increase the characteristics and performance of the motor, it is recommended to purchase and install a cylinder head designed for motors in racing cars. You can also take care of installing special camshafts with increased valve lift. When choosing a camshaft, it is necessary to take into account the fact that only 12.7 mm of valve lift with bronze guides for their bushings is needed to boost the engine.

If the valves have a 14 mm lift, you will definitely need roller rockers (rockets), with which the service life of the valve stem and guide bushings is increased. In motors for ring and off-road competitions, camshafts are used, which have a valve lift of up to 16.5 mm. For comparison, on dragsters, this value is 21.6 mm.

6. Disassemble the cylinder head, then apply a layer of plasticine to the piston head. Install the cylinder head and tighten the fasteners, then install and adjust the rocker arms and rods.

7. Then you need to turn the crankshaft two full turns. Now you can remove the cylinder head in order to measure the thickness of the plasticine in the thinnest place. Remember, it must be at least 2 mm in the area of the inlet valve, and at least 2.5 mm in the area of the outlet valve. In this way, it is necessary to check the measurements of each cylinder.

8. To upgrade the combustion chambers, polish their surfaces.

9. Then it is necessary to measure their volumes in order to align the chambers during their processing in all cylinders. The shape of the chamber does not need to be measured until you are convinced that you have studied the effect of the changes made in the cylinder head on the propagation of flame in the cylinders of the engine.

Combustion chambers are treated after all valves have been treated. Before starting work, take care to protect the saddles from all kinds of accidental damage.

Some helpful tips

Video (click to play).

When installing a sports camshaft, it is necessary to replace the valve springs with springs that are specially designed for the specific shaft. In the case of using bronze guide bushings, you should opt for those with Teflon seals. In the event of increased pressure in the exhaust system of the formed engines, they will prevent oil from entering the channels.

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