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Fan fixed andfloating bearingarrangement

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.

Non locatingbearing

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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.

Craft Split Roller Bearings, in all shaft sizes and series, are manufactured in two types—held and float (non-expansion and expansion).  They are manufactured as separate bearings to solve the problem of some applications needing to allow for shaft axial movement (parallel to the shaft) and others needing to be able to hold the shaft in a fixed axial position.Â

Held Bearing (HD)              The held bearing accepts both radial (perpendicular to the shaft) and axial (parallel to the shaft) loads. The main purpose of the held bearing is to “anchor” a shaft in position, to prevent shaft drift during operation, and absorb thrust or “side” load imposed by the equipment in operation. The held bearing is normally mounted on the drive side, or drive end of a piece of equipment, directing shaft expansion away from the drive. In applications where a high thrust load is expected or realized, please contact our technical department for advice on proper bearing selection.

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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The float or “expansion” bearing is designed to take radial (perpendicular) load only. It is designed to allow for thermal growth of a shaft during operation.  The floating bearing is normally mounted opposite the drive end of a shaft and used in conjunction with a held or fixed bearing when both bearings are mounted on a common shaft section.

Floating bearingturbo

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.

Floating bearingarrangement

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We combine our years of expertise with exceptional customer service and the highest quality products. All this assures you of the best experience from start to finish.

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At Bearing Centre, bearings are the core of our business and automotive bearings are no exception. Contact us today if you have any thrust bearing concerns, or need some expert sales advice.

Bearinglayout

Floating bearingvs fixedbearing

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.

Built under strict quality control standards; Tested for impact| wear and fatigue to ensure quality and durability; Manufactured in ISO9002 Certified facility.

In most applications, one of each type bearing is mounted to each solid shaft section. In the instance of long line shafting, one held bearing is normally used with the rest being floating type. Exact placement of the bearings can vary.  When using both floating and held type Craft bearings in an application, be sure to maintain individual bearing components of each type separately as they are shipped.  Bearing parts are not interchangeable, and individual bearing components are manufactured—and matched—at our plant for proper internal clearance and fit.  Mixing components during installation may cause less than desirable performance or premature failure.