Tool for replacing valve guide sleeves

Replacement of valve sleeves in the classic car

To replace the valve guide sleeves is quite rare, although it befalls most owners of cars VAZ classic family.

To begin with the purpose of these most bushings they, proceeding from the name, are intended to limit the spatial movement of valves in relation to the cylinder head, reducing it to reciprocating motion. Simply speaking, these are the bushings where the valves move.

Why do they have to be replaced?? The question is correct, but it is necessary to look at the root. The main indicator to the replacement is the wear of the sleeve (respectively increase in the inner diameter under the valve stem) of more than 0.15 mm and it can not be eliminated by replacing the valve for a new one. Also arising from this defect is a rapid wear of oil-repellent caps (valve seals in the name), in more complicated cases, frankly wobbly valve in a bushing tears gland. Accordingly, through a bad oil seal in the cylinder gets oil, blue smoke from the exhaust, the horror face and twitching eye of the owner There are also noises, as a result of the gap. But it is worth noting that valve sleeves have a service life approaching 300Km. These sleeves are not replaced at the first overhaul and (although this may not be a rule for you) are not replaced at the end of the service life of the valves.

The replacement of the valve guide bushings is naturally done with the cylinder head removed, the valves removed and desiccated.

Valve bushings for intake and exhaust valves are different! Inlet valve guides are shorter in length and have a radiator groove in them that goes halfway down the length of the guide to minimize oil contamination of the inlet manifold. Exhaust valve bushings are long by size, with a groove inside the bushing that runs the full length of the bushing. I read somewhere that bushings made of bronze are not bad.

To replace the valve guide sleeves, you will need the following tool:

Checkering tool to replace valve guide sleeves

You should start replacement with the old bushing, it’s pretty easy to do, you need to take a mandrel in your left hand and a hammer in your right and knock out the old bushing. This should be done on all the bushes. If you can not make or buy such a mandrel, you can use any rod of suitable diameter, but it is not desirable!, It is easier to give to a machinist.

When inserting the new guide bushings, you need to show ingenuity, and actually warm up the cylinder head to about 100 degrees, and put the bushes in the freezer for a day or two beforehand. That way, simply speaking, you can maximize the expansion of the seating hole and minimize the contraction of the guide bushing. Also, don’t forget that before inserting, you must put the retaining rings on the bushes.

It would seem and all? Yes almost, there is the most important part, we put the valves in, but they do not fit? All the matter is that when inserting bushes, they can slightly change their inner diameter, here reamers will help us.

About reamers should be noted separately, because quite often I met the expression that the reamer 8.028 (for the exhaust valve) is probably somewhat larger. The fact that the replacement of the valve guides in most cases involves countersinking of the valve seat, because the new bushing may give a small deflection, so that it is very difficult to achieve leak tightness. So in the process of lapping, especially if you do it with drill, the valve stem tends to rub on the inside diameter of the sleeve and in the end of lapping (and it can be not very fast) it turns out that the valve is loose in the new guide sleeve. To avoid that, it is advised to first punch a hole with a smaller reamer 8.022, and if the valve stem fits, then lapping with this hole. At the end of the process, the valve should move in the sleeve easily and naturally:), along with not dangling sideways (remember the 0.15mm).

I hope the information will be useful to you, if you have any questions, I will answer them in the Комментарии и мнения владельцев. In the following posts we will consider lapping the valves on a classic car.

Replacing the valve guide sleeves. assembling tools

Before replacing the valve guide sleeves, some preparation is necessary. Replacement of bushings on all cars is made approximately the same. There are slight differences in the engines of certain countries, for example, the order of work on the Russian and Japanese engines will be different. To perform this operation, you need a special mandrel, which can be ordered to any familiar turner, or you can go to a workshop.

Also before changing you need to prepare a standard set of tools: wrench, screwdrivers, drills, and similar things. It is worth noting that you will need to press the valve guide sleeves, it is a special tool. This device is now sold in stores, but you can also make it yourself. In this article we will not describe how to make this tool, but you can easily find information in other articles.

The guides can be pressed out with a puller or hammered out through a spacer. Each of these methods has its advantages and disadvantages, and peculiarities of one or another method. It is easier, of course, to knock out with a hammer, but you can damage the guide and it will break the seating hole; the puller will do its job accurately, but it is expensive enough to buy it for a single use, it is easier then to give it to the service station, they will do for the same money.

The guides are located on top of the cylinder head, which means they must be knocked out of the combustion chamber. To hammer it out, you need a mandrel a little narrower than the bushing’s outside diameter. For convenience the edge of the mandrel should be hewn to the size of the inner diameter of the bushing, so that the inner part of the mandrel fits into the hole of the guide and the outer part fits into its end. That way this construction won’t slide off anywhere.

It is desirable to take a heavier hammer for reaming, then the guide will come out with one blow. In order to reduce the interference, the head can be heated up slightly, e.g. with an electric hotplate; the different coefficients of linear expansion of the steel (bushing material) and aluminum (head material) reduce the interference and less force is required. The disadvantage of this method can be a splayed sleeve on one side, which will not go through the hole and thus damage the head.

tool, replacing, valve, guide, sleeves

Pressed out in a similar way, only instead of hitting with a hammer, the force of the puller will be applied. The puller looks as follows: a stud of about the same diameter as the inner hole is passed through the guide bushing, it is secured with a nut on the combustion chamber side, on the reverse side a stop is made, through which the stud will be pulled together with the bushing. Then a nut is screwed on the stud, the distance is reduced and the sleeve comes out of the seating hole. If with a lot of force the sleeve did not go, it should be torn by tapping on the puller from the side of the combustion chamber. From here on everything will go like clockwork.

How to replace the valve guides. step by step master class how to replace the guides with your own hands correctly (95 photos)

The fact is that the valve sleeve guides are not only made for aluminum cylinder blocks. This detail is in every variant of the unit and it is made of the same material as the head block itself.

Sleeves at purchase are already included with the head in it, and they do not wear out very quickly. That is why not all car owners know about them.

However, all the same, replacement of valve guide bushings in any car, including models of VAZ 2109, 2114, 2107 and other cars is simply necessary.

Though, this kind of spare part usually has a service life of about 200, in some cases it becomes unusable before. The only possible cause of damage is surface abrasion due to external influences.

And as for the reasons for the failure of the part, there are several at once:

  • Not timely oil change and the choice of lubricant of poor quality.
  • Frequent engine overheating.
  • Bad fuel.
  • Improperly adjusted ignition system.

Because the part is worn, it does not rotate properly. This results in leaks and gaps, through which oil enters the internal combustion system.

And fuel leaks into the intake system where it shouldn’t be. Here you will definitely need a tool for replacement of valve guide bushings.

How to change the valve guide sleeves on VAZ by yourself

One of the advantages of cars, produced by domestic factories, is the ability to repair any nodes and units, up to complete disassembly of the engine. If the car owner has begun to master the repair of the cylinder head, it is necessary to understand how to replace the valve guide bushings. This procedure, compared to other manipulations, is not difficult, but it is essential to ensure the performance of the engine.

What the valve guide sleeve is for?

The components of the cylinder head play an important role in the engine’s stable operation. One should be particularly attentive to the condition of the valves, because the efficiency of filling the cylinders with combustible mixture and releasing it from the products of fuel combustion depend on them. This work is entrusted to the valves, which open and close the holes of the channels of fuel mixture and exhaust gases in a timely manner.

Each valve has a working part in the form of a disk (disc) that fits snugly on the seat and the stem. It is the piston rod that transmits the reciprocating motion necessary for the operation of the mechanism. The valve spindle is encased in a special sleeve to ensure that it moves axially at all times.

The valve guides are designed so that the valve does not have the ability to oscillate sideways. The lack of clearance between the surface of the rod and the inner surface of the sleeve also helps the valve packing protect the combustion chamber from the ingress of engine oil. Even taking into account the fact that very strong alloys are used for valves and guides, wear and tear is inevitable. That is why valve sleeves periodically need to be replaced.

The obvious signs of the need for such repair are:

  • ingress of engine oil into the combustion chamber (increased oil consumption, blue exhaust smoke);
  • typical noise from the cylinder head;
  • replacement of the valve guides with new ones;
  • replacing valves after they have been damaged (especially if the stem is bent);
  • overhaul of cylinder head.

Preparing the engine for replacement of valve guide bushings VAZ

Any work related to the repair of a car engine requires preparation. This is especially important when it comes to the timing mechanism. In the process of returning the engine to life you will not manage to do without a simple set of wrenches. The design of individual elements requires special devices.

Replacement of valve guide sleeves VAZ on all cars of the classic series is exactly the same because of the identical structure of engines. To perform this operation you need a special mandrel which can be ordered by a turner you know or bought in a store. It is made up of a handle and a working part. The working part is the rod with a diameter slightly less than the bushing outside diameter and a thinner part that goes freely into the bushing at the end.

In addition, it is necessary to prepare reamers. special long drills, which allow you to bring the inner diameter of the holes to the right caliber. The reamers need to be purchased at the store:

Of course, replacement of valve bushings of any car engine can only be done after the head is dismantled, the valves and other elements of the cylinder head are removed, and the studs near the cylinders and in the upper part are unscrewed (they prevent pressing in of bushings).

tool, replacing, valve, guide, sleeves

Valve Guide Repair Sleeves Demo Part2

Replacement of valve guide bushings. act sequentially

Before starting work, the cylinder head should be free of grease and dirt. Next, it should be placed on a workbench with good lighting. After that, the following operations should be performed:

  • inserting in turn the mandrel into the holes of the old bushings (on the side of the combustion chamber), carefully hammering on its end and knocking out the bushings;
  • clean the bushing seating with a rag and benzene or solvents, blow with compressed air;
  • The bushes must be kept in the freezer for about 2 days beforehand in order to shrink them;
  • heat the cylinder head on an electric stove to about 100 degrees Celsius (this will expand the seating channels);
  • put the retaining rings on the bushings, insert the bushings into the holes and carefully hammer them through the mandrel until they are fully seated.

replacement of the valve guides is completed by refining the holes in the bushings to the required diameter. This should be done when the head is completely cooled down. If the valve stem does not enter the bushing hole, it is bored out with reamers, which are used in turn from the smallest size with a field trial of each pass.

What to Know When Performing a Repair

In order to ensure that the replacement of valve sleeves VAZ made properly, in advance it is necessary to determine where to install the inlet and outlet valves, as well as to prepare the sleeves. It is difficult to confuse them. The intake valve sleeve is shorter and has lubrication grooves all the way down the middle of the sleeve. Exhaust valve sleeves are longer and have grooves all the way on the inside.

Repairs to the cylinder head

The cylinder head pressure test is performed before machining the plane or diagnosing the valve mechanism. The only operation performed before. technological washing. Pressing is a check of the cooling jacket for tightness. If damage is detected. Evaluate the possibility of further repair. Based on the results of the evaluation, a decision is made as to whether the cylinder head should be repaired. Pressing is also performed after the removal of nozzles, glow plug debris, replacement of seats and technological plugs, welding works carried out on the cylinder head (cylinder head).

Repair of the cylinder head also means work on the valve train. Valve lapping, valve seat replacement, valve sleeve replacement.

It is worth noting that the pressurization of the cylinder head is one of the services provided by the company “Motorinteh”. This technology is used in pressing:

We are ready to offer you a full range of services for diagnostics and repair of cylinder head. Thanks to our professionalism, vast experience and availability of all the necessary tools, we can identify all the existing problems and fix them effectively. We guarantee you a high quality of all work, including the repair of the cylinder head, as well as our staff will help you make a selection of liners.

Signs of failure of the valve guides

The wear of the valve guide sleeves is quickly and easily determined by the vehicle owner. The main symptom of this malfunction is the increase in consumption of engine oil.

The first thing to check when there is an increase in engine oil consumption is the car’s engine valves. Another sign of malfunction may become a characteristic noise of the motor in the area of the heads. The easiest way to check this is to open the hood of the car, start the engine and listen carefully. If in the background of the engine will be noticed a strange and unusual noise, it is worth to diagnose the valves and guide bushings.

Why do liners fail?

The main reason of failure of the guide bushings is their wear and tear. As a result, the consumption of lubricating fluid increases, as the backlash of parts leads to rapid failure of the oil cap and oil leaks into the combustion chamber. As a result, there is observed the formation of carbon deposits, violation of thermal conditions of the engine, an increase in the toxicity of exhaust gases and catalytic converter breakage (if the car has one).

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Worn valve sleeves VAZ 2106

Timely change of engine oil and correct exploitation of the car engine allows prolonging the life of bushings and replacing them every 180-200 thousand kilometers. However, due to the valve clearances and engine oil not meeting the recommended standards, lateral wear of bushings and decreased valve mobility along the piston rod axis due to increased radial load on it may occur. For this reason it is mandatory to correct the clearance of the guide bushings after changing the oil caps. If the gap is too big and play is detected, the bushings must always be replaced.

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