Crankshaft Check On Used Cars

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Crankshaft Check On Used Cars




The crankshaft functions to change the rising and falling motion of the piston to become rotary motion. The pressure on combustion is very large, therefore it is the crankshaft that will withstand the considerable pressure resulting from the explosion of the combustion.

Therefore the crankshaft can cause bending. In addition, bending of the crankshaft can also cause wear, because the crankshaft also rotates. Wear also occurs in the crank journal and also the crank pin which is part of the crank shaft.

The crank journal is the part of the crankshaft that rests on the cylinder block. And the crank pin is the part of the crankshaft that is related to the connecting rod or often called the piston handlebar. So for the overall check of the crankshaft, i.e. checking for flexion and also checking for wear.

Crankshaft bending check:
Place the crankshaft on the V block as shown in the picture
  1. Pemeriksaan kebengkokkan crankshaft:


  2. Then place/install the gauge dial in the middle of the crankshaft which is part of the most central crank journal.
  3. After that rotate the crankshaft slowly up to 1 360 degree rotation. While looking at the results of the measurements on the gauge dial.
  4. Compare the results of the curvature measurement on the gauge dial with the standardized curvature limit. For an example taken from a famous car brand with a curvature limit of 0.03mm.
  5. If the measurement exceeds the limit of 0.03 mm. It means the crankshaft is very bent. And the cranshaft must be replaced. If it does not exceed 0.03 mm, it means that the crankshaft is still fairly straight or not bent.

        Wear check for crank pin

        1. First measure the center line (diameter) of the crankpin using a micrometer.
        2. Then record the results of the measurements on all crank pins. If the engine is 4 cylinders means there are 4 crank pins.
        3. After that compare the results of the measurements and service limits, for each vehicle has a different service limit. For that I use the example of the crank pin limit in one of the Toyota vehicle types:

        For standard 47,988 – 48,000 (mm)

        0.25 = 47.738 - 47.750 (mm)

        0.50 = 47.488 – 47.500 (mm)

        0.75 = 47,238 – 47,250 (mm)

        Pemeriksaan keausan crank pin

        Check for wear on the crank journal

        1. First measure the diameter of the crank journal using a micrometer.
        2. Then record the results of these measurements in all crank journals. And for a 4 cylinder engine it has 5 crank journals.
        3. After that compare the results of the measurement with the service limit. For the following example (mm units):

        Standard = 49,976 – 50,000
        0.25 = 49.733 – 49.743
        0.50 = 49.483 – 49.493


        Based on the results of measurements on the crank journal and also the crank pin, it can be seen the level of wear in that section. If the conditions before the crank journal and crankpin are still at the standard, then the size limit or range must be in accordance with the data above.


        For example, if the size of the crank pin is 49,950 mm and the crank journal is 49,900. It can be concluded that the crank pin and crank journal are worn out.


        Because the service limit of the standard crank pin size is 47,988 – 48,000 mm and the service limit of the crank journal size is 49.976 – 50,000 mm, so the result is smaller than the service limit, aka worn.


        Therefore, the crankshaft must be undersized or grinding to reduce its size. In addition, the metal crankshaft must be replaced according to the size of the undersize.




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        Crankshaft Check On Used Cars

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        Crankshaft berfungsi untuk merubah gerak naik dan turunnya piston untuk menjadi gerak putar. Tekanan pada pembakaran sangatlah besar, oleh karena itu
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        The crankshaft functions to change the rising and falling motion of the piston to become rotary motion. The pressure on combustion is very large, therefore it is the crankshaft that will withstand the considerable pressure resulting from the explosion of the combustion.

        Therefore the crankshaft can cause bending. In addition, bending of the crankshaft can also cause wear, because the crankshaft also rotates. Wear also occurs in the crank journal and also the crank pin which is part of the crank shaft.

        The crank journal is the part of the crankshaft that rests on the cylinder block. And the crank pin is the part of the crankshaft that is related to the connecting rod or often called the piston handlebar. So for the overall check of the crankshaft, i.e. checking for flexion and also checking for wear.

        Crankshaft bending check:
        Place the crankshaft on the V block as shown in the picture
        1. Pemeriksaan kebengkokkan crankshaft:


        2. Then place/install the gauge dial in the middle of the crankshaft which is part of the most central crank journal.
        3. After that rotate the crankshaft slowly up to 1 360 degree rotation. While looking at the results of the measurements on the gauge dial.
        4. Compare the results of the curvature measurement on the gauge dial with the standardized curvature limit. For an example taken from a famous car brand with a curvature limit of 0.03mm.
        5. If the measurement exceeds the limit of 0.03 mm. It means the crankshaft is very bent. And the cranshaft must be replaced. If it does not exceed 0.03 mm, it means that the crankshaft is still fairly straight or not bent.

              Wear check for crank pin

              1. First measure the center line (diameter) of the crankpin using a micrometer.
              2. Then record the results of the measurements on all crank pins. If the engine is 4 cylinders means there are 4 crank pins.
              3. After that compare the results of the measurements and service limits, for each vehicle has a different service limit. For that I use the example of the crank pin limit in one of the Toyota vehicle types:

              For standard 47,988 – 48,000 (mm)

              0.25 = 47.738 - 47.750 (mm)

              0.50 = 47.488 – 47.500 (mm)

              0.75 = 47,238 – 47,250 (mm)

              Pemeriksaan keausan crank pin

              Check for wear on the crank journal

              1. First measure the diameter of the crank journal using a micrometer.
              2. Then record the results of these measurements in all crank journals. And for a 4 cylinder engine it has 5 crank journals.
              3. After that compare the results of the measurement with the service limit. For the following example (mm units):

              Standard = 49,976 – 50,000
              0.25 = 49.733 – 49.743
              0.50 = 49.483 – 49.493


              Based on the results of measurements on the crank journal and also the crank pin, it can be seen the level of wear in that section. If the conditions before the crank journal and crankpin are still at the standard, then the size limit or range must be in accordance with the data above.


              For example, if the size of the crank pin is 49,950 mm and the crank journal is 49,900. It can be concluded that the crank pin and crank journal are worn out.


              Because the service limit of the standard crank pin size is 47,988 – 48,000 mm and the service limit of the crank journal size is 49.976 – 50,000 mm, so the result is smaller than the service limit, aka worn.


              Therefore, the crankshaft must be undersized or grinding to reduce its size. In addition, the metal crankshaft must be replaced according to the size of the undersize.


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