{"id":42466,"date":"2022-09-15T06:43:00","date_gmt":"2022-09-15T13:43:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=42466"},"modified":"2024-06-15T01:37:10","modified_gmt":"2024-06-15T08:37:10","slug":"what-are-rod-bearings-causes-symptoms-of-failure-explained","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/what-are-rod-bearings-causes-symptoms-of-failure-explained\/","title":{"rendered":"What are Rod Bearings? Causes &#038; Symptoms of Failure Explained"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_70c8ed-03 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_70c8ed-03 > .kt-inside-inner-col,.kadence-column_70c8ed-03 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_70c8ed-03 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_70c8ed-03 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_70c8ed-03 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_70c8ed-03 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_70c8ed-03{position:relative;}@media all and (max-width: 1024px){.kadence-column_70c8ed-03 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_70c8ed-03 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_70c8ed-03 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-5907a7  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-a7212a\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_259c2d-00, .wp-block-kadence-advancedheading.kt-adv-heading_259c2d-00[data-kb-block=\"kb-adv-heading_259c2d-00\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_259c2d-00 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_259c2d-00[data-kb-block=\"kb-adv-heading_259c2d-00\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_259c2d-00 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_259c2d-00[data-kb-block=\"kb-adv-heading_259c2d-00\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_259c2d-00 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_259c2d-00\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>An engine rod bearing refers to a split-sleeve type bearing that holds the crankshaft and connecting rod in place as they rotate.<\/li><li>Lack of lubrication, dirt build-up, and corrosion can damage an engine rod bearing.<\/li><li>Overlay fatigue can also wear out your ride&rsquo;s rod bearing. Using sab-par oil and assembly errors can also cause a rod bearing to fail.<\/li><li>Aside from an illuminated check engine light, expect to hear a rapping noise in your engine once this bearing fails.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Think your car&rsquo;s <a href=\"https:\/\/www.carparts.com\/rod-bearing\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"rod bearings\">rod bearings<\/a> are shot? In this article, we&rsquo;ll talk about what rod bearings are, including the causes and symptoms of their failure in this article.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is a Rod Bearing?<\/h2>\n\n\n\n<p>An engine rod bearing is a split-sleeve type of bearing (meaning it has two separate semicircular halves or shelves) that keeps the crankshaft and connecting rod in place as they rotate. The bearing&rsquo;s top half has a pinhole that keeps the crankshaft lubricated, allowing it to spin freely inside the bearing without generating excessive heat. Each piston and connecting rod assembly inside your engine has a rod bearing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rod Bearings vs. Main Bearings<\/h2>\n\n\n\n<p>The crankshaft spins in the main bearings and each piston&rsquo;s connecting rod, with its bearings, is connected to the crank throws, each one like a crank &ldquo;handle&rdquo; that provides the power to turn the crankshaft.<\/p>\n\n\n\n<p>But because rod bearings and <a href=\"https:\/\/www.carparts.com\/main-bearing\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"main bearings\">main bearings<\/a> are both located near the engine and crankshaft, it can be hard to tell them apart. Here&rsquo;s how to differentiate the two:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/rod-bearing-and-main-bearing-1024x324.png\" alt=\"rod bearing and main bearing\" class=\"wp-image-73927\" width=\"1024\" height=\"324\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/rod-bearing-and-main-bearing-1024x324.png 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/rod-bearing-and-main-bearing-300x95.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/rod-bearing-and-main-bearing-768x243.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/rod-bearing-and-main-bearing-150x47.png 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/rod-bearing-and-main-bearing.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Because rod bearings and main bearings are both located near the engine and crankshaft, it can be hard to tell them apart.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Location<\/h3>\n\n\n\n<p>Rod bearings sit between the connecting rods and crankshaft while main bearings are positioned between the crankshaft and engine block.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Attachment<\/h3>\n\n\n\n<p>A rod bearing&rsquo;s upper half is linked to the connecting rod&rsquo;s bigger end while its lower half is connected to the rod bearing cap. In the case of the main bearing, its upper half is attached to the engine block while its lower half is connected to the main bearing cap.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Oil Flow<\/h3>\n\n\n\n<p>To keep the crankshaft lubricated, oil must first pass through the main bearing before it reaches the rod bearing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material<\/h3>\n\n\n\n<p>Both rod and main bearings are usually made from nonferrous metals (a metal that doesn&rsquo;t contain iron). Examples of bearing materials include aluminum and bronze.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Quantity<\/h3>\n\n\n\n<p>The total number of rod bearings an engine has depends on its cylinders. A vehicle typically has at least two main bearings located on each end of the <a href=\"https:\/\/www.carparts.com\/crankshaft\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"crankshaft\">crankshaft<\/a>. The number of main bearings can also be increased to improve engine stability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Purpose<\/h3>\n\n\n\n<p>Rod bearings are perfectly sized, two-piece laminated shells that fit in the large end of each piston&rsquo;s connecting rod, consisting of several layers of metal to provide a replaceable wear surface. Lawn mower engines typically don&rsquo;t have rod or main bearings. Each bearing has a small &ldquo;tang&rdquo;<\/p>\n\n\n\n<p>Lube oil from the crankcase is pumped by the engine <a href=\"https:\/\/www.carparts.com\/oil-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oil pump\">oil pump<\/a> under pressure through specially drilled holes in the crankshaft to keep the bearings and crankshaft journals from grinding and galling, which always happens when lube oil pressure is lost.<\/p>\n\n\n\n<p>There is some normal wear, and when the rod and main bearings begin to wear, some of the oil pressure is lost at high temperature. And while overhead <a href=\"https:\/\/www.carparts.com\/camshaft\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"camshafts\">camshafts<\/a> can wear their cam saddles and caps and cause lost oil pressure, cam-in-the-block engines have circular one-piece bearings that can wear and cause the same problem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Causes Rod Bearing Failure?<\/h2>\n\n\n\n<p>There are several reasons why rod bearings fail. Here are some of the most common ones:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lack of Lubrication<\/h3>\n\n\n\n<p>Lack of lubrication is the number one cause of rod bearing failure. The root cause of the issue could be anything from a low oil level to a faulty oil pump. Clogged oiling passages can also lead to isolated bearing failures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Misassembly<\/h3>\n\n\n\n<p>Assembly errors such as improper shim installation, reversed bearing caps and halves, misaligned bearing oil holes, and unnested locating lugs are some factors that contribute to premature bearing failure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Using Sub-Par Oil<\/h3>\n\n\n\n<p>Engine oils come with a set of additives that protect bearings from rubbing together under extreme heat and pressure. Using a sub-par engine oil or one that doesn&rsquo;t match your vehicle&rsquo;s specifications may result in bearing failure, as it won&rsquo;t have the right set of additives to protect your vehicle&rsquo;s bearings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Overlay Fatigue<\/h3>\n\n\n\n<p>Overloading the rod bearing may result in overlay fatigue, which is the formation of fine cracks along its surface. Once the cracks form, overlay material will fill in the cracks and relieve the bearing&rsquo;s load concentration.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dirt Build-Up<\/h3>\n\n\n\n<p>Dirt build-up is a common cause of bearing failure. Dust, road debris, and metal particles can get trapped inside the oil, damaging the bearing lining and reducing its service life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Corrosion<\/h3>\n\n\n\n<p>Pitting in the bearing surface may occur due to the accumulation of harmful acids in the crankcase. Although corroded bearings are more common in diesel engines due to the presence of high sulfur fuel, this can also happen to gas cars if the motor oil is not changed periodically.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/2007-chevy-cobalt-bearings-1024x922.png\" alt=\"2007 chevy cobalt bearings\" class=\"wp-image-73929\" width=\"1024\" height=\"922\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/2007-chevy-cobalt-bearings-1024x922.png 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/2007-chevy-cobalt-bearings-300x270.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/2007-chevy-cobalt-bearings-768x692.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/2007-chevy-cobalt-bearings-150x135.png 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/2007-chevy-cobalt-bearings.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>These photos are from a 2007 Chevy Cobalt. All the engine&rsquo;s bearings are susceptible to failure if lubrication is lost.<br><br>The top left illustration is the lower half of a heat-cooked connecting rod due to an oil pan breach and loss of all the engine oil from hitting a piece of rebar on the highway. The top right illustration is the bearing from this rod, and the bottom left illustration is the rod journal from the crankshaft.<br><br>The bottom right photo is the camshaft saddle in the head that was damaged on the same vehicle. Most overhead camshafts don&rsquo;t have split bearings. The camshaft just spins between its caps and saddles on the head while receiving pressurized lube oil through a port in the head gasket. But in the case of lost lubrication, that tends to damage the cylinder head. Furthermore, wear at the cam saddles can actually cause a loss in oil pressure, which leads to reduced effectiveness of oil pressure driven timing chain tensioners. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Symptoms of Faulty Rod Bearings<\/h2>\n\n\n\n<p>Two of the most common symptoms that point to a faulty rod bearing are rod knock and illuminated warning lights.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rod Knock<\/h3>\n\n\n\n<p>A damaged or worn-out connecting rod bearing may result in excessive rod knock, which is a rapping noise produced by the engine. This means that the clearance between the connecting rod and crankshaft has changed, hence the knocking sound.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"WHAT ROD BEARING KNOCK SOUNDS LIKE\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/CyxTNuW4apo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Illuminated Warning Lights<\/h3>\n\n\n\n<p>The oil light on the dashboard may illuminate due to <a href=\"https:\/\/www.carparts.com\/blog\/low-oil-pressure-symptoms-and-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"low oil pressure\">low oil pressure<\/a> caused by a loose rod bearing, leading to increased clearance between internal engine parts. The <a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light\">check engine light<\/a> may also illuminate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Factors to Consider When Getting a Rod Bearing Replacement<\/h2>\n\n\n\n<p>Always consider your vehicle&rsquo;s year, make, and model when buying any car part to ensure that the product has the right specifications for easy installation. You should also consider getting replacement rod bearings t from a brand you trust. If you&rsquo;re working on a tight budget, it&rsquo;s a good idea to look into aftermarket replacements.<\/p>\n\n\n\n<p>Aftermarket rod bearings are made from the same high-quality materials as original equipment manufacturer (OEM) bearings but without the hefty price tag. These are made by more than one manufacturer, which makes them easier to source than their OEM counterparts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Much Do Rod Bearings Cost?<\/h2>\n\n\n\n<p>Rod bearings can cost anywhere <strong>between $25 and $80 plus labor costs<\/strong>, depending on your vehicle&rsquo;s year, make, and model. Other factors that may affect the price include the brand, quantity, and size.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get New Rod Bearings for Your Vehicle<\/h2>\n\n\n\n<p>It&rsquo;s best to stop driving when your vehicle&rsquo;s rod bearings are damaged. They could lead to engine malfunction or damage, which are some of the most expensive repairs to make. Luckily, rod bearing sets that fit your car are easy to find with CarParts.com.<\/p>\n\n\n\n<p>You don&rsquo;t even have to leave the comforts of your home to get new rod bearing sets. Use your phone or laptop to navigate <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>, and use our vehicle selector to input your car&rsquo;s year, make, and model to find compatible parts. We source our parts from the most trusted manufacturers in the industry, so you know you&rsquo;re getting replacement rod bearings that last. Additionally, our warehouses are strategically scattered across the US, meaning you&rsquo;ll get your order in a matter of days.<\/p>\n\n\n\n<p>Don&rsquo;t wait until your rod bearings break before replacing them. Check out our wide selection of quality <a href=\"https:\/\/www.carparts.com\/rod-bearing-set\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"rod bearing sets\">rod bearing sets<\/a> now at CarParts.com.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Think your car&rsquo;s rod bearings are shot? In this article, we&rsquo;ll talk about what rod bearings are, including the causes&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/what-are-rod-bearings-causes-symptoms-of-failure-explained\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":42468,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3747],"tags":[3080,1950],"ppma_author":[2607,2985],"class_list":{"0":"post-42466","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-engine","9":"tag-rod-bearing","10":"tag-rod-bearing-set","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What are Rod Bearings? Causes &amp; Symptoms of Failure Explained - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Get to know how rod bearings work and the symptoms that indicate the need for a replacement.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/what-are-rod-bearings-causes-symptoms-of-failure-explained\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are Rod Bearings? 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