{"id":1009,"date":"2025-04-03T15:14:59","date_gmt":"2025-04-03T07:14:59","guid":{"rendered":"https:\/\/hengoseal.com\/?p=1009"},"modified":"2025-06-04T11:22:01","modified_gmt":"2025-06-04T03:22:01","slug":"crankshaft-oil-seal-replacement","status":"publish","type":"post","link":"https:\/\/hengoseal.com\/th\/crankshaft-oil-seal-replacement\/","title":{"rendered":"\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19\u0e40\u0e1e\u0e25\u0e32\u0e02\u0e49\u0e2d\u0e40\u0e2b\u0e27\u0e35\u0e48\u0e22\u0e07: \u0e2d\u0e32\u0e01\u0e32\u0e23 \u0e01\u0e32\u0e23\u0e40\u0e1b\u0e25\u0e35\u0e48\u0e22\u0e19\u0e0b\u0e35\u0e25 \u0e41\u0e25\u0e30\u0e15\u0e31\u0e27\u0e40\u0e25\u0e37\u0e2d\u0e01\u0e17\u0e35\u0e48\u0e14\u0e35\u0e17\u0e35\u0e48\u0e2a\u0e38\u0e14"},"content":{"rendered":"<p>Noticed oil puddles under your car or stains near the engine? It might be a leaking <strong>\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19\u0e40\u0e1e\u0e25\u0e32\u0e02\u0e49\u0e2d\u0e40\u0e2b\u0e27\u0e35\u0e48\u0e22\u0e07<\/strong>\u2014a small part that can cause major engine problems if ignored.<\/p>\n<p>Crankshaft oil seals play a crucial role in keeping oil inside the engine while blocking dirt and debris from entering. But with constant heat and rotation, they eventually wear out.<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hengoseal.com\/wp-content\/uploads\/2025\/04\/Split-Opening-Skeleton-Oil-Seal.jpg\" alt=\"placeholder_image\" \/><\/p>\n<p>In this guide, I\u2019ll explain what crankshaft seals do, how to recognize failure signs, when to replace front vs rear seals, and how to select the right aftermarket replacement.<\/p>\n<h2>What does a crankshaft oil seal do?<\/h2>\n<p>A crankshaft oil seal is a rubber or polymer ring located at either end of the crankshaft. It prevents oil from escaping the crankcase while allowing the crankshaft to rotate freely.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0e1e\u0e34\u0e21\u0e1e\u0e4c<\/th>\n<th>\u0e17\u0e35\u0e48\u0e15\u0e31\u0e49\u0e07<\/th>\n<th>\u0e04\u0e33\u0e2d\u0e18\u0e34\u0e1a\u0e32\u0e22<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0e0b\u0e35\u0e25\u0e40\u0e1e\u0e25\u0e32\u0e02\u0e49\u0e2d\u0e40\u0e2b\u0e27\u0e35\u0e48\u0e22\u0e07\u0e2b\u0e19\u0e49\u0e32<\/td>\n<td>\u0e1b\u0e01\u0e43\u0e01\u0e25\u0e49\u0e40\u0e27\u0e25\u0e32<\/td>\n<td>\u0e0b\u0e35\u0e25\u0e40\u0e1e\u0e25\u0e32\u0e2b\u0e21\u0e38\u0e19\u0e17\u0e35\u0e48\u0e1b\u0e25\u0e32\u0e22\u0e23\u0e2d\u0e01<\/td>\n<\/tr>\n<tr>\n<td>\u0e0b\u0e35\u0e25\u0e2b\u0e25\u0e31\u0e01\u0e14\u0e49\u0e32\u0e19\u0e2b\u0e25\u0e31\u0e07<\/td>\n<td>Between engine &amp; gearbox<\/td>\n<td>Seals crankshaft at transmission end<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Both are critical to engine performance. At Hengoseal, we supply crankshaft seals in <strong>\u0e40\u0e2d\u0e47\u0e19\u0e1a\u0e35\u0e2d\u0e32\u0e23\u0e4c<\/strong> \u0e41\u0e25\u0e30 <strong>\u0e40\u0e2d\u0e1f\u0e40\u0e04\u0e40\u0e2d\u0e47\u0e21<\/strong>, designed to meet or exceed OEM standards.<\/p>\n<p>Looking for a reliable fit? Try our <a href=\"https:\/\/hengoseal.com\/th\/product\/toyota-oil-seal\/\" target=\"_blank\">\u0e15\u0e31\u0e27\u0e40\u0e25\u0e37\u0e2d\u0e01\u0e0b\u0e35\u0e25\u0e02\u0e49\u0e2d\u0e40\u0e2b\u0e27\u0e35\u0e48\u0e22\u0e07\u0e02\u0e2d\u0e07\u0e42\u0e15\u0e42\u0e22\u0e15\u0e49\u0e32<\/a> or read our <a href=\"https:\/\/hengoseal.com\/th\/toyota-oil-seal-replacement\/\" target=\"_blank\">\u0e04\u0e39\u0e48\u0e21\u0e37\u0e2d\u0e01\u0e32\u0e23\u0e40\u0e1b\u0e25\u0e35\u0e48\u0e22\u0e19\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19\u0e02\u0e2d\u0e07\u0e42\u0e15\u0e42\u0e22\u0e15\u0e49\u0e32<\/a> for application tips.<\/p>\n<h2>What are the symptoms of a bad crankshaft seal?<\/h2>\n<p>A worn or broken crankshaft oil seal often shows signs that shouldn\u2019t be ignored:<\/p>\n<ul>\n<li>Oil dripping from the front or rear of the engine  <\/li>\n<li>Dark oil stains under the car or near the bell housing  <\/li>\n<li>Smell of burning oil while driving  <\/li>\n<li>Visible oil on the crankshaft pulley or flywheel  <\/li>\n<li>Gradual decrease in oil levels  <\/li>\n<li>Increased engine vibration or noise<\/li>\n<\/ul>\n<p>Catching these early can prevent transmission removal if the rear main seal is the issue.<\/p>\n<h2>How do you replace a crankshaft oil seal?<\/h2>\n<p>Here\u2019s what you need for a basic replacement:<\/p>\n<p><strong>Tools:<\/strong><\/p>\n<ul>\n<li>Pulley puller or flywheel tool  <\/li>\n<li>Seal puller or flat-head screwdriver  <\/li>\n<li>Oil seal installer or mallet  <\/li>\n<li>Socket set, rags, sealant<\/li>\n<\/ul>\n<p><strong>\u0e02\u0e31\u0e49\u0e19\u0e15\u0e2d\u0e19:<\/strong><\/p>\n<ol>\n<li>Disconnect battery and drain oil  <\/li>\n<li>Remove the pulley (front) or transmission (rear)  <\/li>\n<li>Extract the old seal carefully  <\/li>\n<li>Clean and inspect the seal groove  <\/li>\n<li>Lubricate and press the new seal evenly  <\/li>\n<li>Reinstall components  <\/li>\n<li>Add new oil and check for leaks<\/li>\n<\/ol>\n<p>If it\u2019s the rear main seal, consider getting help\u2014transmission removal is tricky. Need part confirmation? Our <a href=\"https:\/\/hengoseal.com\/th\/oil-seal-cross-reference-chart\/\" target=\"_blank\">\u0e15\u0e32\u0e23\u0e32\u0e07\u0e2d\u0e49\u0e32\u0e07\u0e2d\u0e34\u0e07\u0e44\u0e02\u0e27\u0e49\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19<\/a> helps identify correct replacements.<\/p>\n<h2>Can I use aftermarket crankshaft oil seals?<\/h2>\n<p>Yes. In fact, aftermarket seals like ours offer premium features at a better price:<\/p>\n<ul>\n<li>OEM-level precision fit  <\/li>\n<li>FKM (heat-resistant) and NBR (cost-effective) materials  <\/li>\n<li>Models compatible with TOYOTA, HONDA, NISSAN, etc.  <\/li>\n<li>Support for small batch and bulk orders<\/li>\n<\/ul>\n<p>We also have a <a href=\"https:\/\/hengoseal.com\/th\/skeleton-oil-seal-guide\/\" target=\"_blank\">\u0e04\u0e39\u0e48\u0e21\u0e37\u0e2d\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19\u0e42\u0e04\u0e23\u0e07\u0e01\u0e23\u0e30\u0e14\u0e39\u0e01<\/a> to explain seal structure and performance.<\/p>\n<h2>Should you replace both crankshaft seals at once?<\/h2>\n<p>Only if you're already doing major engine work.<\/p>\n<p>Replace both seals during:<\/p>\n<ul>\n<li>Full engine rebuilds  <\/li>\n<li>Clutch or flywheel replacement  <\/li>\n<li>Timing belt or chain replacement<\/li>\n<\/ul>\n<p>Otherwise, it\u2019s fine to just fix the leaking seal. For full replacements, check our <a href=\"https:\/\/hengoseal.com\/th\/product\/mitsubishi-oil-seal\/\" target=\"_blank\">MITSUBISHI crankshaft oil seals<\/a>.<\/p>\n<p>Not sure what fits your crankshaft? Just send your shaft size or OEM number\u2014we\u2019ll match it fast.<\/p>\n<h2>\u0e1a\u0e17\u0e2a\u0e23\u0e38\u0e1b<\/h2>\n<p>A faulty crankshaft oil seal can turn a small leak into a major repair. By spotting symptoms early and replacing with high-quality aftermarket seals, you\u2019ll save time and protect your engine.<\/p>\n<h2>Need help with crankshaft oil seal replacement?<\/h2>\n<p>We stock OEM-quality seals for most brands, offer fast delivery, and support bulk orders.<\/p>\n<p>\ud83d\udce7 \u0e2d\u0e35\u0e40\u0e21\u0e25: info@hengoseal.com<br \/>\n\ud83d\udcde\u0e27\u0e2d\u0e15\u0e2a\u0e4c\u0e41\u0e2d\u0e1b: +86 17622979498<br \/>\nLet us match your seal by sample, photo, or dimensions.<\/p>\n<h2>Related topic<\/h2>\n<ul>\n<li><a href=\"https:\/\/hengoseal.com\/th\/blog\/how-to-choose-hydraulic-seal-kits-by-size\/\" target=\"_blank\">How to choose hydraulic seal kits by size<\/a>  <\/li>\n<li><a href=\"https:\/\/hengoseal.com\/th\/skeleton-oil-seal-guide\/\" target=\"_blank\">\u0e04\u0e39\u0e48\u0e21\u0e37\u0e2d\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19\u0e42\u0e04\u0e23\u0e07\u0e01\u0e23\u0e30\u0e14\u0e39\u0e01<\/a>  <\/li>\n<li><a href=\"https:\/\/hengoseal.com\/th\/toyota-oil-seal-replacement\/\" target=\"_blank\">\u0e04\u0e39\u0e48\u0e21\u0e37\u0e2d\u0e01\u0e32\u0e23\u0e40\u0e1b\u0e25\u0e35\u0e48\u0e22\u0e19\u0e0b\u0e35\u0e25\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19\u0e02\u0e2d\u0e07\u0e42\u0e15\u0e42\u0e22\u0e15\u0e49\u0e32<\/a>  <\/li>\n<\/ul>\n<style>\n.faq-question {\ncursor: pointer;\nfont-weight: bold;\npadding: 10px;\nbackground-color: #f1f1f1;\nborder: 1px solid #ddd;\nmargin-bottom: 5px;\ncolor: #0073aa;\n}\n.faq-answer {\ndisplay: none;\npadding: 10px;\nborder-left: 3px solid #0073aa;\nbackground-color: #f9f9f9;\nmargin-bottom: 10px;\n}\n<\/style>\n<p><script>\ndocument.addEventListener('DOMContentLoaded', function() {\nconst questions = document.querySelectorAll('.faq-question');\nquestions.forEach(question => {\nquestion.addEventListener('click', function() {\nconst answer = this.nextElementSibling;\nanswer.style.display = answer.style.display === 'block' ? 'none' : 'block';\n});\n});\n});\n<\/script><br \/>\n<!-- JSON-LD FAQ Schema --><br \/>\n<script type=\"application\/ld+json\">\n{\n\"@context\": \"https:\/\/schema.org\",\n\"@type\": \"FAQPage\",\n\"mainEntity\": [\n{\n\"@type\": \"Question\",\n\"name\": \"What&rsquo;s the best material for crankshaft seals?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"NBR is ideal for most engines; FKM is better for high heat and fuel exposure.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can I cross-reference a crankshaft seal by part number?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes. Use our <a href='https:\/\/hengoseal.com\/oil-seal-cross-reference-chart\/' target='_blank'>cross reference chart or send your part number.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Is the front crankshaft seal the same as the rear?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"No, they differ in location, size, and difficulty of installation.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"How long do crankshaft oil seals last?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Usually between 80,000 and 150,000 km depending on usage and material.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"What happens if I ignore a leaking seal?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"You risk oil loss, engine overheating, and internal damage.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can you help match a seal if I don&rsquo;t know the part number?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, just send us dimensions or a photo&mdash;we match parts daily.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Do you offer crankshaft seals for trucks?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Absolutely. We cover both commercial trucks and passenger vehicles.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Do you support custom packaging for crankshaft seals?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes. OEM\/ODM options are available with low minimum order quantity.\"\n}\n}\n]\n}\n<\/script><\/p>\n<h2>\u0e1c\u0e39\u0e49\u0e04\u0e19\u0e22\u0e31\u0e07\u0e16\u0e32\u0e21<\/h2>\n<div class=\"faq-container\">\n<div class=\"faq-question\">1. What\u2019s the best material for crankshaft seals?<\/div>\n<div class=\"faq-answer\">NBR is ideal for most engines; FKM is better for high heat and fuel exposure.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">2. Can I cross-reference a crankshaft seal by part number?<\/div>\n<div class=\"faq-answer\">\u0e43\u0e0a\u0e48 \u0e43\u0e0a\u0e49\u0e02\u0e2d\u0e07\u0e40\u0e23\u0e32 <a href=\"https:\/\/hengoseal.com\/th\/oil-seal-cross-reference-chart\/\" target=\"_blank\">cross reference chart<\/a> or send your part number.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">3. Is the front crankshaft seal the same as the rear?<\/div>\n<div class=\"faq-answer\">No, they differ in location, size, and difficulty of installation.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">4. How long do crankshaft oil seals last?<\/div>\n<div class=\"faq-answer\">Usually between 80,000 and 150,000 km depending on usage and material.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">5. What happens if I ignore a leaking seal?<\/div>\n<div class=\"faq-answer\">You risk oil loss, engine overheating, and internal damage.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">6. Can you help match a seal if I don\u2019t know the part number?<\/div>\n<div class=\"faq-answer\">Yes, just send us dimensions or a photo\u2014we match parts daily.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">7. Do you offer crankshaft seals for trucks?<\/div>\n<div class=\"faq-answer\">Absolutely. We cover both commercial trucks and passenger vehicles.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">8. Do you support custom packaging for crankshaft seals?<\/div>\n<div class=\"faq-answer\">Yes. OEM\/ODM options are available with low minimum order quantity.<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Noticed oil puddles under your car or stains near the engine? It might be a leaking crankshaft oil seal\u2014a small [&hellip;]<\/p>","protected":false},"author":1,"featured_media":1010,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[32,54],"tags":[],"class_list":["post-1009","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oil-seal","category-selection-guide"],"_links":{"self":[{"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/posts\/1009","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/comments?post=1009"}],"version-history":[{"count":0,"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/posts\/1009\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/media\/1010"}],"wp:attachment":[{"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/media?parent=1009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/categories?post=1009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hengoseal.com\/th\/wp-json\/wp\/v2\/tags?post=1009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}