Crankshaft pulley screw broke off

Crankshaft pulley screw broke off

When operating a car, an unpleasant breakdown may occur - a broken generator pulley screw, which is attached to the crankshaft of the car engine.
The main reason for this malfunction is a poor-quality screw, or its tightening when installing the pulley.
Crankshaft pulley screw broke off

You can repair this problem yourself. This will require some effort. In rare cases, it is possible to turn a crimp by hitting a small chisel with a hammer. Most often it is necessary to drill along the axis of the broken screw. Let's look at repairs using the example of a VAZ engine.

Tools and materials


To dismantle the broken generator pulley screw, we will need some tools:
  • electric or hand drill (wrench);
  • metal drills with a diameter of 3-5-7 mm;
  • conical extractor with left-hand thread;
  • core;
  • flat screwdriver;
  • liquid for removing rust and scale (WD-40).

Repair stages


It is necessary to inspect the end part of the break, remove the burrs with a screwdriver and treat the circumference of the broken screw with a special liquid for removing rust and scale (WD-40). This will make it easier to remove the screw shaft later.
Let's determine the approximate drilling depth by comparing the broken part (head) of the screw with the new screw. As a rule, it does not exceed 1.5 cm.
Crankshaft pulley screw broke off

Next, we determine the condition of the end of the crease. It is desirable to have a flat surface perpendicular to the axis of the screw. If the surface is inclined, you need to select the appropriate drill and work with it a little. This will make the surface level and make drilling easier.
Crankshaft pulley screw broke off

We mark the drilling point of the broken screw. Using a hardened, durable metal drill with a diameter of 3 mm (preferably domestically produced), we begin to drill out the broken screw to its entire depth.
Crankshaft pulley screw broke off

In some cases, such drilling is sufficient. All that remains is to change the drill to a conical extractor with a left-hand thread, screw it into the hole and unscrew the remaining screws.
Crankshaft pulley screw broke off

Crankshaft pulley screw broke off

If the broken screw cannot be removed, it is necessary to repeat its drilling with a drill of a larger diameter. Such drilling greatly weakens the crease, and at a certain stage its removal is not difficult. Its thin walls can simply be destroyed without harming the threads in the crankshaft. After removing the crease, it is necessary to carefully remove all remaining metal from the crankshaft.
Crankshaft pulley screw broke off

conclusions


A small number of tools and skills in working with them made it possible to carry out a rather complex type of repair - breaking off the screw connecting the generator pulley to the crankshaft.

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Comments (4)
  1. Guest Vladimir
    #1 Guest Vladimir Guests 27 February 2019 18:08
    0
    Everything is basically correct, except for one thing - THIS IS NOT A SCREW, BUT A BOLT!
    1. ive
      #2 ive Guests 28 February 2019 15:38
      1
      The differences between a bolt and a screw are as follows: first of all, the bolt holds the parts together by passing through them and, on the other hand, a nut is screwed onto the bolt. That is, a bolt and a nut are two parts of the whole. The screw also serves to connect two parts, but is screwed into a special thread that is found on the second part. Therefore the screw comes without a nut.
      1. Boris
        #3 Boris Guests 1 March 2019 22:59
        1
        A screw is a type of fastener used to secure elements and mechanisms. It is for fixing and not fastening. And wraps it with a screwdriver. Its task is akin to that of a cotter pin, dowel, or pin.
  2. Boris Khanin
    #4 Boris Khanin Guests 1 March 2019 22:52
    1
    The crankshaft pulley is a crankshaft pulley and not a generator!