The presence of dirt and contaminants is damaging to every type of bearing, so it’s also an obvious cause of failure in thrust bearings. Make sure you have an effective maintenance schedule in place and that cleaning is performed with clean cloths and refined oil. Polishing the surface of the thrust surface, preferably with a polishing machine, is also important. If any grinding marks are left on the crankshaft face, they can act like wiper blades, removing the thrust bearing’s essential oil film.

CF4polar or nonpolar

Without proper care, cleaning and maintenance, the thrust bearing may become misaligned and begin grinding against a surface, causing sparking. This results in “hot spots” which can damage the overall operation. It’s important to maintain a thrust surface that is set at 90° to the crankshaft centre-line, producing a thrust face that is square to the axis of the main bearing journal.

CF4lone pairs

The molecular geometry of each molecule can be determined by the number of bonding and non-bonding electron pairs around the central atom.

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CF4hybridization

CF4 shapeand bond angle

Overloading is usually caused by either operator error or as the result of a distorted crankcase. In both instances, overloading will cause unnecessary wear and tear, as well as possible thrust bearing failure. To avoid overloading as an operator, it’s important not to idle excessively or attempt to “hot rod”. If the problem lies with the crankcase, try to remove any additional loads and repair the bearing using a 90º oil routine.

Deviations from the idealized bond angle are expected in NF3, OF2, and H2S. This is because the lone pairs of electrons around the central atom repel the bonding pairs, causing the bond angles to be less than the ideal angles. In a tetrahedral molecule like CF4, the ideal bond angle is @$\begin{align*}109.5^\circ\end{align*}@$. In NF3, the presence of a lone pair on the nitrogen atom will reduce the bond angle slightly. Similarly, in OF2 and H2S, the presence of two lone pairs on the central atom will reduce the bond angle from the ideal @$\begin{align*}109.5^\circ\end{align*}@$ to less than @$\begin{align*}109.5^\circ\end{align*}@$.

In an engine block, crankshaft thrust bearings are placed into grooves formed in the block’s webbing. Their purpose is to limit the crankshaft’s forward and backward movement by keeping the crankshaft within a specific area of motion. By controlling the majority of the forward and backward movements, tolerances within the entire rotating assembly can be preserved which, at high revolutions, is essential for maintaining the engine’s lifespan.

CF4bond angle

It’s not actually common for crankshaft thrust bearings to fail but when they do, the result can be catastrophic for the engine. Aside from the significant costs for repair, a thrust bearing failure can pose a serious safety threat to operators in the general area. So, what is the purpose of a crankshaft thrust bearing and why do they sometimes fail? Here we answer your questions and advise on how to prevent an engine disaster.

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