{"id":328,"date":"2026-05-14T15:28:54","date_gmt":"2026-05-14T15:28:54","guid":{"rendered":"https:\/\/www.preludemarketplace.com\/?p=328"},"modified":"2026-05-14T15:28:54","modified_gmt":"2026-05-14T15:28:54","slug":"a-critical-check-when-replacing-crank-seals","status":"publish","type":"post","link":"https:\/\/www.preludemarketplace.com\/?p=328","title":{"rendered":"A CRITICAL Check When Replacing Crank Seals!"},"content":{"rendered":"\n

When replacing the front main seal on your Prelude, be very careful to make sure the old seal has not worn a groove in the nose of the crankshaft. The later Acura Integra B-series engines are famous for this with the rear main seal, and if the groove is not covered with a metal sleeve before the new seal is installed, it will tear up the new seal and start a nasty leak. Ask me how I know\u2014it happened to me on my \u201998 Integra! I am not sure how prone the A-series Preludes are to this vis-\u00e0-vis the front main seal, but it\u2019s definitely worth checking carefully and maybe even buying a front main seal that already comes with a sleeve. As for rear main seals, trust me, it is NO FUN taking a transmission off a second time to get at a new seal that has been ruined!<\/p>\n\n\n\n

\"\"
The rear main seal of a Honda B18 from my Acura. These photos are of course not of Preludes, but just a reference to make the issue more clear.<\/figcaption><\/figure>\n\n\n\n
\"\"
Look carefully and you will see the groove worn in the crankshaft. The old seal and the groove were well mated and so there was no leak yet. But the new seal got torn up quickly and I had a nasty new leak in no time. <\/figcaption><\/figure>\n\n\n\n
\"\"
The solution I found. It had to be modified with a Dremel to fit correctly, but it worked.<\/figcaption><\/figure>\n\n\n\n
\"\"
The sleeve being test fit before final installation. It worked great – haven’t had a leak since 2019 when this was done.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

When replacing the front main seal on your Prelude, be very careful to make sure the old seal has not […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","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":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[26],"tags":[],"class_list":["post-328","post","type-post","status-publish","format-standard","hentry","category-how-to-guides"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=\/wp\/v2\/posts\/328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=328"}],"version-history":[{"count":1,"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=\/wp\/v2\/posts\/328\/revisions"}],"predecessor-version":[{"id":333,"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=\/wp\/v2\/posts\/328\/revisions\/333"}],"wp:attachment":[{"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.preludemarketplace.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}