Connecting rod bearing replacement

Connecting rod bearing replacement
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The connecting rods connect the pistons and the crankshaft. They convert the reciprocating motion of the pistons in the cylinders into the rotary motion of the crankshaft, which is further transmitted to the wheels. The slide bearings fitted at the crankshaft base reduce the friction generated during the crankshaft rotation. If the bearings are not sufficiently lubricated or the lubricating oil is worn or contaminated, the bearings wear and fail as a result of excess friction. This may damage the journals and the crankshaft itself. When the bearings fail, you can hear a disturbing noise and clatter at idle speed.

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  • Regular oil and oil filter change reduces the wear of the bearings
  • Engine remanufacturing requires replacing the bearings
Range of services icon

Range of services

  • Removing parts of the engine
  • Removing the pistons and the connecting rods
  • Replacing the bearings with new ones
  • Refitting the previously removed elements
  • Changing the engine oil and the oil filter

Car workshops: Connecting rod bearing replacement

Service description

What are connecting rod bearings?

Connecting rods connect engine pistons to the crankshaft. The power generated by means of the combustion of the fuel-air mixture pushes down the pistons, which push the crankshaft webs causing its rotation. Connecting rods are attached to pistons by means of crank pins, and to the crankshaft by means of a connecting rod ends equipped with piston bearings.

When should piston bearings be replaced?

Piston bearings, which are slide bearings, wear out with time. A rhythmical engine clatter coming from the lower part of the engine when at idle speed is a sign of their malfunction. Malfunction of piston bearings may also be caused as a result of neglecting oil change or by oil thinning resulting from driving a car over short distances, when the engine does not reach the working temperature and the non-combusted fuel drips down to the sump thinning the oil.

How are piston bearings replaced?

Their replacement necessitates the removal of the sump located at the bottom of the engine. The bearings can be accessed after removing the connecting rod end. Some engines require removal of the cylinder head in order to remove the whole pistons with connecting rods through the cylinders.

What else to keep in mind?

The repair necessitates engine oil and filter change. In addition, the sump must be cleared off of contaminants and the oil pump strainer must be checked for patency.

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