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Why did the Connecting Rod Break?

Burning of Connecting Rod Bearing

The following factors contribute to connecting rod bearing bush burning: high oil temperature (above water temperature), low oil pressure, harsh driving, power loss, black smoke, or even flameout; However, there is an unusual noise, and there is metal dust in the oil pan.

Reason: due to a lack of oil, an oil film cannot develop between the journal and the bearing bush, resulting in semi-dry or dry friction. As a result, the temperature rises significantly, leading the bearing bush alloy to melt and bite each other. Low oil volume, blocked oil passages or filters, and low oil pressure; bearing clearance is too small or too large; oil quality does not meet the requirements, such as oil that is too thin, low viscosity, or oil that contains impurities; the engine has been overloaded for a long time, the speed is low, the bearing bush pressure is increased, the oil supply is reduced, the journal and bearing bush are not uniformly worn, the axial wear is uneven; the engine has been overloaded for a long; Furthermore, after a cold engine is started at a low temperature without low-speed pre-heating, the accelerator is immediately increased to fast increase the crankshaft speed, resulting in a narrow contact area between the journal and the bearing bush and unevenly distributed contact points. The connecting rod bearing for Kubota v3300-t engine is selling well.

Connecting Rod

Broken Connecting Rod Bolt

Connecting rod bolts that break might cause serious mechanical problems. It is quite easy to produce cylinder crushing and tile burning mishaps if they are not identified and dealt with quickly. If the engine does not run smoothly, makes unusual noises, or does not catch fire and generates black smoke while in operation, it should be stopped immediately for an inspection. The connecting rod bolt of the diesel engine abruptly snapped after a driver pounded the gas pedal after starting the tractor, causing the cylinder block to rupture and damage to the crankshaft, pistons, and other parts, resulting in significant economic losses.

Reasons for cracking or breaking of connecting rod bolts: (1) During installation, the tightening tension is excessively high, exceeding the material’s strength and causing cracks. (2) Inadequate tightening torque, or one loosening and one tightening, loosening due to impact during work, and impact fatigue damage to bolts. (3) The diesel engine is overloaded for an extended period of time, over speed happens, tile burning occurs, and the body temperature is excessively high, making the bolts prone to fracture or break. (4) There is too much space between the connecting rod bolt and the mounting hole. (5) The manufacturing quality is poor, the heat treatment is ineffective, and the strength is inadequate. (6) The installation is wrong because the bolt head and fitting surface are not flat, causing a considerable bending moment and cracks. (7) The space between the crankshaft connecting rod journal and the bearing bush is too large, resulting in an increase in impact load and damage to the bolt. (8) The connecting rod bolts are unevenly strained and damaged due to the bending of the connecting rod.

Connecting Rod

Deformation of Connecting Rod

When the connecting rod is working, the swing and force are significant due to the connecting rod’s extension; when the engine is overloaded and knocked, the rod body is bent and twisted. In Landtopmall, the connecting rod for the Mitsubishi 6d16 engine for sale.

Reasons for connecting rod deformation: (1) Useful reasons The diesel engine is overheating, overloading at low speeds, or the fuel supply is arriving too soon. The connecting rod is prone to fatigue deformation even in normal operation due to severe compression and stress. (2) A mechanical failure. Flying cars, burning bushes, shafts, and piston expansion all occur in the operation of diesel engines, causing deformation of the connecting rods. (3) Repair and assembly reasons Because the distance between the cylinder liner and the piston is too narrow, the piston becomes stuck in the cylinder liner when heated, and the connecting rod breaks or bends. It is simple to bend the connecting rod during the repair procedure, such as drilling the connecting rod bush or gripping the connecting rod in the vice to tighten or unscrew the connecting rod nut. The centerline of the piston pin is not parallel to the centerline of the crankshaft connecting rod journal during installation, causing fatigue bending, or even breaking of the connecting rod.


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