Engine Bearings
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- Sealed Power®Crankshaft Main BearingCrankshaft Main Bearing by Sealed Power®. Designed utilizing the latest technology, this product by Sealed Power features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Direct replacementManufactured to strict engineering quality standards$40.40 - $366.12
- Enginetech®Crankshaft Main BearingCrankshaft Main Bearing by Enginetech®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...Rigorously tested to withstand years of abuseDesigned with innovative manufacturing techniques$12.51 - $194.72
- Sealed Power®A-Series Main BearingA-Series Main Bearing by Sealed Power®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...A-Series bi-metal aluminum alloyGreater seizure resistance than tri-metal material$18.53 - $232.47
- ACDelco®Genuine GM Parts™ Crankshaft Main BearingGenuine GM Parts™ Crankshaft Main Bearing by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$4.12 - $157.92
- Mopar®Crankshaft Main Bearing SetCrankshaft Main Bearing Set by Mopar®. Want your prized possession to look and perform the way it was designed to? Then top-of-the-line Mopar automotive parts and accessories are for you. Made using the latest manufacturing technology...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$1.17 - $1,361.96
- DNJ Engine Components®Crankshaft Main BearingCrankshaft Main Bearing by DNJ Engine Components®. If you crave for the finest replacement for your worn out parts, look no further than this superior bearing set that is built with the same quality and durability as your OE parts. It...Designed to provide reliable performance within your vehicle's engineMade from top-grade materials with utmost care to ensure long-lasting service$19.23 - $96.09
- King Engine Bearings®SI-Series Main Bearing SetSI-Series Main Bearing Set by King Engine Bearings®. This King Engine Bearings product is professionally and meticulously designed to provide superior durability you are looking for. The company does not accept compromises when it is...High quality at an affordable priceExpertly made from premium materials$27.94 - $91.81
- Taiho®Crankshaft Main BearingCrankshaft Main Bearing by Taiho®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$28.61 - $79.93
- Genuine®Crankshaft Main BearingCrankshaft Main Bearing by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using state-of-the-art...Made with precision and quality in mindDesigned to meet your specific needs$19.13 - $307.28
- Mahle®Crankshaft Main BearingCrankshaft Main Bearing by Mahle®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$22.31 - $150.42
- Original Equipment®Main BearingMain Bearing by Original Equipment®. Looking for high-quality replacement parts to restore the performance of your vehicle? Then Original Equipment automotive parts are for you. They are manufactured from the finest materials according...Perfect replacement for your damaged or worn out original partMade using high-grade materials for long-lasting dependability$183.86 - $242.51
- ITM Engine®Crankshaft Main Bearing SetCrankshaft Main Bearing Set by ITM Engine®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$18.18 - $140.47
- Professional Parts Sweden®Main Bearing SetMain Bearing Set by Professional Parts Sweden®. If you need premium-quality yet affordable replacement parts for your Volvo or SAAB, Professional Parts Sweden hits the spot. Top-of-the-line Professional Parts Sweden products are made...Direct replacement for your factory partEngineered to meet exact OEM standards$90.04 - $256.40
- Clevite®A Series Crankshaft Main BearingsA Series Crankshaft Main Bearings by Clevite®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$17.53 - $177.88
- Clevite®AL Series Main BearingsAL Series Main Bearings by Clevite®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit...Expertly crafted from premium materialsDesigned to match rigorous quality standards$23.22 - $103.56
- Clevite®Crankshaft Main Bearing SetCrankshaft Main Bearing Set by Clevite®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...Expertly crafted from premium materialsDesigned to match rigorous quality standards$13.98 - $161.68
- Clevite®H Series Crankshaft Main Bearing SetH Series Crankshaft Main Bearing Set by Clevite®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Expertly made from premium materialsHigh crush for better seating and retention.$111.25 - $264.97
- Clevite®P Series Crankshaft Main Bearing SetP Series Crankshaft Main Bearing Set by Clevite®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Expertly crafted from premium materialsDesigned to match rigorous quality standards$23.49 - $270.29
- Clevite®Replacement Crankshaft Main BearingsReplacement Crankshaft Main Bearings by Clevite®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Expertly crafted from premium materialsDesigned to match rigorous quality standards$51.30 - $123.80
- Crown®Crankshaft Main BearingCrankshaft Main Bearing by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck! This product is...Developed to improve your driving experienceConstructed to ensure ultimate operation$17.39 - $202.35
- Eurospare®Crankshaft Main BearingCrankshaft Main Bearing by Eurospare®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$5.23 - $37.29
- King Engine Bearings®AM-Series Connecting Rod Bearing SetAM-Series Connecting Rod Bearing Set by King Engine Bearings®. This King Engine Bearings product is professionally and meticulously designed to provide superior durability you are looking for. The company does not accept compromises...High quality at an affordable priceExpertly made from premium materials$13.35 - $46.91
- King Engine Bearings®AM-Series Main Bearing SetAM-Series Main Bearing Set by King Engine Bearings®. This King Engine Bearings product is professionally and meticulously designed to provide superior durability you are looking for. The company does not accept compromises when it is...High quality at an affordable priceExpertly made from premium materials$19.92 - $127.97
- King Engine Bearings®Duratec High Performance Main BearingDuratec High Performance Main Bearing by King Engine Bearings®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$78.97
- King Engine Bearings®HP-Series Main Bearing SetHP-Series Main Bearing Set by King Engine Bearings®. This King Engine Bearings product is professionally and meticulously designed to provide superior durability you are looking for. The company does not accept compromises when it is...High quality at an affordable priceExpertly made from premium materials$86.22 - $146.16
- King Engine Bearings®Main BearingMain Bearing by King Engine Bearings®. This King Engine Bearings product is professionally and meticulously designed to provide superior durability you are looking for. The company does not accept compromises when it is going about...High quality at an affordable priceExpertly made from premium materials$22.45 - $325.65
- King Engine Bearings®PMaxKote Main BearingPMaxKote Main Bearing by King Engine Bearings®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$72.26 - $244.13
- King Engine Bearings®XP-Series Main Bearing SetXP-Series Main Bearing Set by King Engine Bearings®. This King Engine Bearings product is professionally and meticulously designed to provide superior durability you are looking for. XP-Series is a unique tri-metal structure for race...High quality at an affordable priceExpertly made from premium materials$51.82 - $245.22
- Glyco®Crankshaft Main BearingCrankshaft Main Bearing by Glyco®. Is your vehicle feeling down on power? Do you see dark puddles on the ground when you park? Is your CHECK ENGINE light on? Your engine may be in need of repair, but before you waste your time and gas...OE quality fluids from top original equipment and aftermarket manufacturersThe finest quality at a great price$32.67 - $425.66
- Glyco®Intermediate Shaft BearingIntermediate Shaft Bearing by Glyco®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$17.75
There are many different kinds of bearings used on automobiles, including ball and roller bearings, needle bearings, and tapered roller bearings, but the bearings that are commonly used inside the engine are called plain bearings. These bearings are either cylindrical or are made of two inserts that form an enclosure. Components like the crankshaft and camshaft rotate on plain bearings supported by a film of oil. Oil is supplied under pressure by the engine oil pump.
Bearing construction varies according to intended use: stock, high-performance, and racing, and there are too many variations for an in-depth discussion here. In general, there are bi-metal and tri-metal bearings. Both have the lining material applied to a rigid and supportive steel backing. Bi-metal bearings have an aluminum alloy lining. The alloy may be strengthened with other metals, and the latest alloys contain silicone, which significantly increases surface hardness. Aluminum alloys with silicone are highly resistant to seizure. Tri-metal bearings have an intermediate layer of copper bearing alloy and an overlay of lead-tin-copper alloy. They have the strength, fatigue resistance and embedability (the ability to embed hard particles like dirt and debris that would otherwise become lodged between the bearing and journal, causing wear to the journal) that is the right combination for many applications.
Bores in the cylinder block are precision machined to accept the engine bearings. The camshaft and balance shaft bearings are cylindrical and pressed into the bores. The main and connecting rod bearing bores are split, with the bottom half of the bore known as the cap. Main and connecting rod bearings are called inserts that fit into bearing “saddles” formed by the top half of the bores in the block and connecting rods, and the caps. Where required, bearings have oil holes that must align with oil passages in the block, and some may have oil grooves. The thrust main bearing is flanged where it contacts the crankshaft thrust surface. Bearing halves for the crankshaft and connecting rods have a certain amount of material that extends above the bore parting line when placed in the saddle, which is known as bearing “crush”. This ensures that the bearings will be fully seated in the bores when the caps are torqued to specification.
For optimal performance and long life, engine bearings must have the right amount of oil clearance. This clearance is the difference between the shaft diameter and the diameter of the installed bearing, and is typically between 0.001” and 0.0035”. Main and connecting rod bearing clearance can be checked with the crankshaft installed using Plastigage, but a more precise measurement can be achieved by measuring the journal diameter with a micrometer and the installed bearing diameter with a bore gauge, and subtracting the micrometer dimension from the bore gauge dimension. If the clearance is excessive and the crankshaft is worn, it can be ground undersize and the appropriate undersize bearings used. However, the main or connecting rod housing bores could also be larger than specifications, requiring the block to be aligned honed or the big ends of the connecting rods reconditioned.
Although there are some performance bi-metal bearings, most performance bearings are of tri-metal construction. Many performance bearings also come with a proprietary dry film coating to reduce friction, provide startup protection, and increase strength and heat resistance. In addition to superior materials, they also have design features better suited to high power output engines. The eccentricity of performance bearings are tailored to the engine block and connecting rod bore characteristics of performance engine components to help maintain proper oil clearance, and they have higher crush for improved bearing retention. Performance bearings may be narrower than stock or chamfered to allow for the larger fillet radiuses of performance crankshafts, and they may have enlarged oil holes and/or grooves to improve lubrication.
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Engine Assemblies
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