{"id":173,"date":"2026-07-17T16:18:49","date_gmt":"2026-07-17T16:18:49","guid":{"rendered":"https:\/\/oayachtservice.com\/knowledgebase\/?post_type=docs&#038;p=173"},"modified":"2026-07-17T16:18:50","modified_gmt":"2026-07-17T16:18:50","password":"","slug":"how-to-inspect-your-running-gear","status":"publish","type":"docs","link":"https:\/\/oayachtservice.com\/knowledgebase\/?docs=how-to-inspect-your-running-gear","title":{"rendered":"How to Inspect Your Running Gear"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cutlass Bearings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When your vessel is hauled for service, a thorough inspection of the <strong>running gear<\/strong> is essential to maintaining proper performance, efficiency, and reliability. One of the most critical components to inspect is the <strong>cutlass bearing<\/strong> (also known as a shaft bearing), which supports the propeller shaft and allows proper shaft rotation while maintaining alignment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Proper cutlass bearing condition is essential for minimizing vibration, protecting the shaft system, and preventing premature wear of related components.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Inspecting Cutlass Bearing Wear<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A common question is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cWhen should cutlass bearings be replaced?\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bearing replacement should be determined by measuring the actual clearance between the propeller shaft and the bearing material\u2014not simply by visual inspection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">During haul-out:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inspect the bearing for visible wear, cracking, distortion, or deterioration.<\/li>\n\n\n\n<li>Check shaft movement within the bearing by manually moving the shaft vertically and horizontally.<\/li>\n\n\n\n<li>Measure bearing clearance using a <strong>feeler gauge, dial indicator, or other appropriate measurement tool<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">As a general reference, a 2-inch diameter shaft may typically allow approximately <strong>0.010 inches of clearance<\/strong> between the shaft and bearing material. Actual allowable tolerances may vary depending on shaft diameter, vessel speed, bearing manufacturer recommendations, and operating conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signs That a Cutlass Bearing May Require Replacement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A cutlass bearing should be evaluated for replacement when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excessive shaft movement is detected.<\/li>\n\n\n\n<li>Shaft clearance exceeds acceptable tolerances.<\/li>\n\n\n\n<li>The rubber bearing surface shows significant wear.<\/li>\n\n\n\n<li>The water lubrication grooves are substantially worn.<\/li>\n\n\n\n<li>The bearing has lost approximately <strong>50% of the original water groove depth<\/strong>.<\/li>\n\n\n\n<li>Continuous vibration is present during operation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A worn bearing can allow excessive shaft movement, leading to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Propeller shaft vibration.<\/li>\n\n\n\n<li>Increased wear on shaft seals.<\/li>\n\n\n\n<li>Damage to shaft alignment.<\/li>\n\n\n\n<li>Premature wear of couplings, transmissions, and related running gear components.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Shaft Condition Must Also Be Evaluated<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing the cutlass bearing alone does not always correct the issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Over time, the propeller shaft itself may wear in the bearing contact area. A worn shaft can cause a new bearing to have excessive clearance immediately after installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Proper repairs may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shaft measurement and inspection.<\/li>\n\n\n\n<li>Shaft repair or replacement if wear exceeds acceptable limits.<\/li>\n\n\n\n<li>Verification of shaft alignment after repairs.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Restoring proper tolerances is essential to achieving smooth operation and preventing recurring vibration issues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vessel Speed Considerations<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Higher-speed vessels are generally more sensitive to running gear tolerances. Excessive cutlass bearing clearance can contribute significantly to vibration at cruising speeds.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lower-speed vessels may tolerate slightly greater clearances; however, all vessels should remain within manufacturer and service specifications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Shaft Bearing Lubrication<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cutlass bearings are designed to operate using <strong>water lubrication<\/strong> supplied through the bearing grooves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do <strong>not<\/strong> use petroleum-based grease or lubricants on water-lubricated shaft bearings.<\/li>\n\n\n\n<li>Petroleum products may damage the bearing material and reduce service life.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The recommended water flow rate through a cutlass bearing is approximately:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2 gallons per minute (GPM) per inch of shaft diameter<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Proper water flow ensures cooling, lubrication, and removal of debris from the bearing surface.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Running Gear Inspection Recommendations<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">During haul-out, inspect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Propeller condition and blade integrity.<\/li>\n\n\n\n<li>Propeller shaft condition.<\/li>\n\n\n\n<li>Shaft seals and dripless seal systems.<\/li>\n\n\n\n<li>Shaft couplings.<\/li>\n\n\n\n<li>Struts and strut bearings.<\/li>\n\n\n\n<li>Rudder bearings and hardware.<\/li>\n\n\n\n<li>Alignment and fastener condition.<\/li>\n\n\n\n<li>Any signs of corrosion or electrolysis.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Owner Best Practices<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Never operate the vessel with continuous or abnormal vibration.<\/li>\n\n\n\n<li>Investigate vibration immediately to prevent additional damage.<\/li>\n\n\n\n<li>Schedule running gear inspections during every haul-out.<\/li>\n\n\n\n<li>Maintain accurate records of shaft, bearing, and alignment measurements.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Important:<\/strong> Continuous vibration should never be considered normal operation. Early diagnosis can prevent costly repairs to shafts, transmissions, bearings, seals, and other running gear components.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><a href=\"mailto:service@eastcoastyachtgroup.com\">Contact our Service Department today<\/a><br>(954.530.2033)<br>To learn how we can help ensure safe and peak performance for your vessel.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><strong>East Coast Yacht Group<\/strong><br>2955 West State Road 84<br>Fort Lauderdale, FL 33312<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cutlass Bearings When your vessel is hauled for service, a thorough inspection of the running gear is essential to maintaining proper performance, efficiency, and reliability. One of the most critical components to inspect is the cutlass bearing (also known as a shaft bearing), which supports the propeller shaft and allows proper shaft rotation while maintaining &#8230; <a title=\"How to Inspect Your Running Gear\" class=\"read-more\" href=\"https:\/\/oayachtservice.com\/knowledgebase\/?docs=how-to-inspect-your-running-gear\" aria-label=\"Read more about How to Inspect Your Running Gear\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[9],"doc_tag":[],"class_list":["post-173","docs","type-docs","status-publish","hentry","doc_category-pro-tips"],"year_month":"2026-07","word_count":609,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"admin","author_nicename":"oaadmin","author_url":"https:\/\/oayachtservice.com\/knowledgebase\/?author=1"},"doc_category_info":[{"term_name":"Pro Tips","term_url":"https:\/\/oayachtservice.com\/knowledgebase\/?doc_category=pro-tips"}],"doc_tag_info":[],"_links":{"self":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs\/173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=173"}],"version-history":[{"count":1,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs\/173\/revisions"}],"predecessor-version":[{"id":174,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs\/173\/revisions\/174"}],"wp:attachment":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=173"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fdoc_category&post=173"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fdoc_tag&post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}