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Replacing the valve seals

March 20, 2021

Due to the nature of the design, large amounts of oil can accumulate in the cylinder head and would have entered the combustion chamber – if not for the valve seals. It is they that protect the cylinder-piston group from the destructive reactions associated with such ingress, increase engine efficiency and ensure oil consumption without exceeding the standard values. But with time they also wear out and fail, and then replacement of valve seals is required. You can do it yourself – if you have some skills. Replacing valve seals becomes pointless after serious damage to the vehicle (e.g., after an accident). If you find yourself in this situation, don’t feel bad. The car can be recycled, and for good money: https://scrapcar.cash.

Signs that the valve seals need replacing

In order to understand that it’s time to change the oil seals, it is not necessary to go to the service station. There are a number of characteristic signs, noticeable and without the use of additional equipment. In particular, these are:

sharp increase in oil consumption,
loss of car power,
appearance of smoking when warming up a cold engine (smoke in such cases comes from the muffler),
problems with starting a hot engine,
increase of fuel consumption.
At occurrence of such problems it is worth to show the car to a specialist at service station. But if for some reason you can not do it, you can try to replace the valve seals with your own hands.

How do I remove the oil seals?

Removing the oil seals is done in stages:

First, you need to remove the cover of the timing gear.
With the use of the marks expose the crankshaft and camshaft, after which the camshaft is removed, and the tensioner is loosened.
If we are talking about a model with a chain-driven timing system, it is also necessary to remove the drive pinion.
The valve tappets are removed, then the camshaft bed is removed from the cylinder head.
The old caps are pulled out carefully, using round pliers.
It is necessary to remove the oil seals themselves starting from the edges, which is due to the design features. Such work is done most often with the use of special pullers. But it is not necessary to remove the cylinder head. And it is not necessary to touch the engine at that. In general, the less will be disassembly work – the better. The purpose of precision equipment like pullers is to avoid it.

One more important point – all dismantled parts, and especially fasteners should be placed so that they could be easily found later. It is recommended to put the fasteners in some container, so that such small parts are not lost.

How to install new oil seals

Before starting work, it is also worth watching a video with an example of how this is done. The algorithm of actions will be as follows:

First you need to remove the valve springs.
Then the stuffing box is installed in the mandrel, it is necessary to drop a little lubricating fluid on the stem.
Put the oil caps on the intended places. Do not forget about the springs. New caps are pressed carefully, using a suitable tube. During the procedure for replacing the oil seals and installing the springs, it is recommended to cover the engine with a rag. In general, this moment requires the utmost accuracy and assembly.
The rest of the valve accessories are installed. It is recommended that the valve cover be previously washed of contaminants. Generally, from time to time it is necessary to do this even without replacing the glands.
Different models may have their own peculiarities. It is clear that VAZ products in this regard differ from European or Asian brands, but in general, the algorithm is the same.

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