Not every driver can afford to visit the car service for every occasion. So, you need to know, how to perform a minor repair yourself. Example, how to unscrew the crankshaft pulley.
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Before twisting something, you need to know, where this part is located and what functions it performs. so, in very simple words, crankshaft pulley - a special wheel, which is located outside the engine.
He is wearing a timing belt, generator, pumps, air conditioning compressor, etc.. If otherwise, a crankshaft pulley is required for this, that from the engine it was possible to operate the hinged equipment and the mechanism of gas distribution.
Without a pulley it is impossible to work the engine and the movement of the car, since the torque from the clone itself will not be sent to other engine components. When looking for this part under the hood of the car, should focus on the generator. The object you are looking for will be at the bottom.
It is mounted on the protruding part of the crankshaft and is kept from turning with a key. Fastened with a nut (less often fastening is made by means of a bolt). In that, how to unscrew the crankshaft pulley bolt, and is the main problem.
There are several types of crankshaft pulley:
- V-belt pulley. This type is present in any Soviet-made car (including, in trucks and buses). It has an all-welded or solid cast design with a groove, which completely repeats the profile of the V-belt.
- Gear pulley. Used on many modern engines after that, as a chain of the timing mechanism was replaced in order to facilitate the entire design of the timing belt. This belt has teeth on its inner surface. In accordance, teeth are made on the outer rim of the pulley.
- Damping pulley. Occurs on many light-duty vehicles, as well as by minibus. This pulley consists of two parts: external working disk and internal holder. A rubber damping gasket is placed between them.
This is done for that, to reduce impulse mechanical impact, which experiences the timing mechanism and the timing belt during engine start and a sharp change in crankshaft speed. A side effect in this case is the relatively short life of the pulley, as well as that, that the part requires increased attention from the driver or mechanic.
After getting acquainted with the detail itself, you can consider the situation, in which it is necessary to unscrew a nut of a pulley of a cranked shaft or fixing its bolt.
When it is necessary to remove the crankshaft pulley
By and large, you will have to remove this part in two cases:
- Disassembly of the entire engine or any repair (example, replacement of crankshaft seals).
- Replacement of the pulley itself. Reasons, for which it is necessary to perform this action, almost always associated with the wear of the part itself.
We also recommend reading the article about it, how to set the timing belt when replacing. In this article you will learn about the features and nuances in the process of self-replacement of the drive belt of the timing mechanism.
The degree of wear is determined experimentally, but this is a topic for a separate article. The point is, that the pulley must be removed in any case. And this process cannot be called simple, although with certain skills and tools, the operation can be performed with your own hands.
How to unscrew and remove the crankshaft pulley
The most difficult action, usually, it is possible to consider unscrewing of fixing nuts or a bolt. It has to do with that, that the direction of the thread coincides with the torque of the crankshaft. In other words, reverse thread. By the way, this fact is the answer to the question, in which direction unscrew the crankshaft pulley bolt. This is done clockwise.
As a result, the self-tightening effect occurs during engine operation. in addition, corrosion and fermentation are often present, which complicates the process. For this reason, it is advisable to use the well-known WD-40 or other similar fluid before starting work., to rust a little sour.
Procedure for unscrewing a bolt or nut
- Install the car on the manhole (if, Of course, do not remove the engine completely), lock the wheels.
- Remove the alternator belt. To do this, loosen the generator locking bolt and tension. If the car is equipped with a power steering with a separate belt, then you still have to remove the belt of this mechanism, unscrewing the bolt of its tension (here you will need a key on 14).
The presence of a pneumatic wrench can facilitate the task of unscrewing the bolt or nut of the pulley. If there is no such tool, then you need to continue the process to unscrew the nut.
- You will need to remove the armor from the ignition distributor, to avoid starting the engine.
- Then you need to take a socket wrench (usually, on 19) with elongated lever (this can be done by trimming the pipe). The length should be enough for that, so that the key rested on the floor. Throw it on the head of the nut or bolt, leaning the lever against the floor.
- In the car cab, briefly turn the ignition key to the "Start" position. Bolt or nut under action on one side of the starter, and on the other hand, fixed wrench, "Breaks" from the place and unscrews.
- Note, that often the first attempt to do so will not work. Therefore, you need to turn the key in the lock several times.
As a result
As described above, you can unscrew the pulley bolt as on a car with a manual transmission, and unscrew the crankshaft pulley on the machine. After unscrewing the mount, you can start shooting the pulley itself. It will be much easier to tighten the nut or bolt when replacing this part.
We also recommend reading the article about it, how to replace the timing chain yourself. In this article you will learn about the features of replacing the drive chain of the timing mechanism.
It is strongly recommended to use a torque wrench and make only effort, prescribed in the manual for repair and operation of a particular car model. The point is, that from the correct moment of tightening will depend not only reliability of fixing and integrity of all elements, but also the ease of unscrewing next time.