{"id":122047,"date":"2026-02-17T09:52:13","date_gmt":"2026-02-17T07:52:13","guid":{"rendered":"https:\/\/vetus.com\/?page_id=122047"},"modified":"2026-03-19T11:20:03","modified_gmt":"2026-03-19T09:20:03","slug":"blog-m-line-maintenance-guide-part-2","status":"publish","type":"page","link":"https:\/\/vetus.com\/fr\/blog\/blog-m-line-maintenance-guide-part-2\/","title":{"rendered":"Blog: M-LINE maintenance guide part 2"},"content":{"rendered":"\n<section class=\"section  \">\n    \n\n<section id=\"section-text-block-block_494ed23339596a17033d43490cd15921\" class=\"section text-block \">\n                    <div class=\"section section__body\">\n            <div class=\"text-block\">\n                <div class=\"container\">\n                    <div class=\"row\">\n                        <div class=\"col-lg-8 offset-lg-2\">\n                                                            <div class=\"section__content single__content hentry\">\n                                    <p data-start=\"289\" data-end=\"545\">Regular maintenance is essential to keep your VETUS marine diesel engine running reliably. In this guide, we explain how to service three critical components of your engine\u2019s cooling and drive systems: the <strong data-start=\"495\" data-end=\"507\">impeller<\/strong>, the <strong data-start=\"513\" data-end=\"523\">V-belt<\/strong>, and the <strong data-start=\"533\" data-end=\"544\">coolant<\/strong>.<\/p>\n<p data-start=\"547\" data-end=\"681\">Routine inspection and replacement of these parts helps prevent overheating, loss of charging power, and unexpected breakdowns on the water.<\/p>\n                                <\/div>\n                            \n                                                            <div class=\"section__actions text-block__actions actions\">\n                                    <div class=\"btn-group d-flex flex-wrap justify-content-center\">\n                                                                                    <a href=\"https:\/\/webshop.vetus.com\/en\/products\/spare-parts\/engine-spare-parts\" class=\"btn btn-primary\" title=\"\" target=\"\">\n                                                <span>View VETUS engine service kit<\/span>\n                                            <\/a>\n                                        \n                                                                            <\/div>\n                                <\/div>\n                                                    <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n        <\/div>\n    <\/section><\/section>\n\n<section class=\"section section--colored bg-light content-blocks bg-light   \">\n    \n\n<section id=\"section-text-block-block_7e2a6a5d59d29f7c885c1d7102473192\" class=\"section text-block \">\n                    <div class=\"section section__body\">\n            <div class=\"text-block\">\n                <div class=\"container\">\n                    <div class=\"row\">\n                        <div class=\"col-lg-8 offset-lg-2\">\n                                                            <div class=\"section__content single__content hentry\">\n                                    <h4 data-start=\"688\" data-end=\"724\">Why this maintenance is important<\/h4>\n<p data-start=\"726\" data-end=\"826\">Your marine diesel engine depends on proper cooling and belt-driven systems to function efficiently:<\/p>\n<ul data-start=\"828\" data-end=\"1057\">\n<li data-start=\"828\" data-end=\"902\">\n<p data-start=\"830\" data-end=\"902\">The <strong data-start=\"834\" data-end=\"846\">impeller<\/strong> ensures seawater circulates through the cooling system.<\/p>\n<\/li>\n<li data-start=\"903\" data-end=\"986\">\n<p data-start=\"905\" data-end=\"986\">The <strong data-start=\"909\" data-end=\"919\">V-belt<\/strong> drives essential components such as the alternator and water pump.<\/p>\n<\/li>\n<li data-start=\"987\" data-end=\"1057\">\n<p data-start=\"989\" data-end=\"1057\">The <strong data-start=\"993\" data-end=\"1004\">coolant<\/strong> regulates engine temperature and prevents corrosion.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1059\" data-end=\"1160\">Failure in any of these areas can lead to overheating, reduced performance, or serious engine damage.<\/p>\n                                <\/div>\n                            \n                                                    <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n        <\/div>\n    <\/section><\/section>\n\n\n<section class=\"section  \">\n    \n<section id=\"content-block-1-block_8a974df1225f2ecf5fb32d1fcc51adf5\" class=\"section content-block content-block--image \">\n    <div class=\"container\">\n        <div class=\"row d-flex align-items-center flex-md-row-reverse\">\n\n            <div class=\"col-md-6 col-lg-7 offset-lg-1\">\n                                    <div class=\"content-block__visuals\">\n                        <div class=\"content-block__media media--clipped media ratio\">\n                            <div class=\"media__wrapper\">\n                                <img decoding=\"async\" width=\"690\" height=\"388\" src=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-690x388.png\" class=\"media__source img-fit\" alt=\"\" srcset=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-690x388.png 690w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-300x169.png 300w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-768x432.png 768w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-210x118.png 210w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-330x186.png 330w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-431x242.png 431w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-507x285.png 507w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-530x298.png 530w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-930x523.png 930w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314-1170x658.png 1170w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h30m45s314.png 1280w\" sizes=\"auto, (max-width: 575.98px) 431px, (max-width: 767.98px) 530px, (max-width: 991.98px) 330px, (max-width: 1279.98px) 530px, (max-width: 1899.98px) 690px, 930px\" loading=\"lazy\" \/>                            <\/div>\n                        <\/div>\n                    <\/div>\n                            <\/div>\n\n            <div class=\"col-md-6 col-lg-4\">\n                <div class=\"content-block__body\">\n                    \n                    \n                                            <h4 data-start=\"1167\" data-end=\"1194\">Servicing the impeller<\/h4>\n<p data-start=\"1196\" data-end=\"1328\">The impeller is a wearable rubber component inside the seawater pump. Over time, the vanes can become brittle, cracked, or deformed.<\/p>\n<h5 data-start=\"1330\" data-end=\"1358\">When to check or replace<\/h5>\n<ul data-start=\"1359\" data-end=\"1502\">\n<li data-start=\"1359\" data-end=\"1387\">\n<p data-start=\"1361\" data-end=\"1387\">At least once per season<\/p>\n<\/li>\n<li data-start=\"1359\" data-end=\"1387\">\n<p data-start=\"1361\" data-end=\"1387\">After winter storage<\/p>\n<\/li>\n<li data-start=\"1388\" data-end=\"1412\">\n<p data-start=\"1390\" data-end=\"1412\">If the engine overheats<\/p>\n<\/li>\n<li data-start=\"1413\" data-end=\"1440\">\n<p data-start=\"1415\" data-end=\"1440\">If reduced cooling water flow is visible from the exhaust<\/p>\n<\/li>\n<\/ul>\n<h5 data-start=\"1504\" data-end=\"1529\">Step-by-step overview<\/h5>\n<ol data-start=\"1531\" data-end=\"2031\">\n<li data-start=\"1531\" data-end=\"1594\">\n<p data-start=\"1534\" data-end=\"1594\"><strong data-start=\"1534\" data-end=\"1594\">Turn off the engine and close the seawater intake valve.<\/strong><\/p>\n<\/li>\n<li data-start=\"1595\" data-end=\"1630\">\n<p data-start=\"1598\" data-end=\"1630\">Remove the pump cover carefully.<\/p>\n<\/li>\n<li data-start=\"1631\" data-end=\"1690\">\n<p data-start=\"1634\" data-end=\"1690\">Extract the impeller using pliers or an impeller puller.<\/p>\n<\/li>\n<li data-start=\"1691\" data-end=\"1787\">\n<p data-start=\"1694\" data-end=\"1706\">Inspect for:<\/p>\n<ul data-start=\"1710\" data-end=\"1787\">\n<li data-start=\"1710\" data-end=\"1738\">\n<p data-start=\"1712\" data-end=\"1738\">Cracked or missing vanes<\/p>\n<\/li>\n<li data-start=\"1742\" data-end=\"1768\">\n<p data-start=\"1744\" data-end=\"1768\">Hard or brittle rubber<\/p>\n<\/li>\n<li data-start=\"1772\" data-end=\"1787\">\n<p data-start=\"1774\" data-end=\"1787\">Deformation<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"1788\" data-end=\"1848\">\n<p data-start=\"1791\" data-end=\"1848\">Lubricate the new impeller with glycerine or soapy water.<\/p>\n<\/li>\n<li data-start=\"1849\" data-end=\"1919\">\n<p data-start=\"1852\" data-end=\"1919\">Insert the new impeller while rotating it in the correct direction.<\/p>\n<\/li>\n<li data-start=\"1920\" data-end=\"1974\">\n<p data-start=\"1923\" data-end=\"1974\">Reinstall the cover with a new gasket if necessary.<\/p>\n<\/li>\n<li data-start=\"1975\" data-end=\"2031\">\n<p data-start=\"1978\" data-end=\"2031\">Reopen the seawater intake valve and test the system.<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"2033\" data-end=\"2120\">&#x1f4a1; <em data-start=\"2036\" data-end=\"2042\">Tip:<\/em> Always check that no broken impeller blades remain inside the cooling system.<\/p>\n                    \t\t\t\t\t\n                                    <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/section><\/section>\n\n<section class=\"section section--colored bg-light content-blocks bg-light   \">\n    \n<section id=\"content-block-1-block_0ef4f08f21b5c0482ab96754f42e7ba3\" class=\"section content-block content-block--image \">\n    <div class=\"container\">\n        <div class=\"row d-flex align-items-center\">\n\n            <div class=\"col-md-6 col-lg-7\">\n                                    <div class=\"content-block__visuals\">\n                        <div class=\"content-block__media media--clipped media ratio\">\n                            <div class=\"media__wrapper\">\n                                <img decoding=\"async\" width=\"690\" height=\"388\" src=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-690x388.png\" class=\"media__source img-fit\" alt=\"\" srcset=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-690x388.png 690w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-300x169.png 300w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-768x432.png 768w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-210x118.png 210w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-330x186.png 330w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-431x242.png 431w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-507x285.png 507w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-530x298.png 530w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-930x523.png 930w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411-1170x658.png 1170w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h33m56s411.png 1280w\" sizes=\"auto, (max-width: 575.98px) 431px, (max-width: 767.98px) 530px, (max-width: 991.98px) 330px, (max-width: 1279.98px) 530px, (max-width: 1899.98px) 690px, 930px\" loading=\"lazy\" \/>                            <\/div>\n                        <\/div>\n                    <\/div>\n                            <\/div>\n\n            <div class=\"col-md-6 col-lg-4 offset-lg-1\">\n                <div class=\"content-block__body\">\n                    \n                    \n                                            <h4 data-start=\"2127\" data-end=\"2167\">Inspecting and adjusting the V-Belt<\/h4>\n<p data-start=\"2169\" data-end=\"2342\">The V-belt transfers power from the crankshaft to components such as the alternator and water pump. A worn or loose belt can reduce charging capacity and cooling efficiency.<\/p>\n<h5 data-start=\"2344\" data-end=\"2361\">Signs of wear<\/h5>\n<ul data-start=\"2362\" data-end=\"2462\">\n<li data-start=\"2362\" data-end=\"2381\">\n<p data-start=\"2364\" data-end=\"2381\">Cracks or fraying<\/p>\n<\/li>\n<li data-start=\"2382\" data-end=\"2409\">\n<p data-start=\"2384\" data-end=\"2409\">Glazing or shiny surfaces<\/p>\n<\/li>\n<li data-start=\"2410\" data-end=\"2444\">\n<p data-start=\"2412\" data-end=\"2444\">Squealing noise during operation<\/p>\n<\/li>\n<li data-start=\"2445\" data-end=\"2462\">\n<p data-start=\"2447\" data-end=\"2462\">Excessive slack<\/p>\n<\/li>\n<\/ul>\n<h5 data-start=\"2464\" data-end=\"2488\">How to Check Tension<\/h5>\n<p data-start=\"2490\" data-end=\"2670\">Press the belt midway between pulleys. It should deflect slightly under firm thumb pressure (typically 10\u201315 mm, depending on the engine model \u2014 always consult your engine manual).<\/p>\n<h5 data-start=\"2672\" data-end=\"2707\">Replacing or Adjusting the Belt<\/h5>\n<ol data-start=\"2709\" data-end=\"2895\">\n<li data-start=\"2709\" data-end=\"2781\">\n<p data-start=\"2712\" data-end=\"2781\">Loosen the mounting bolts of the driven component (e.g., alternator).<\/p>\n<\/li>\n<li data-start=\"2782\" data-end=\"2814\">\n<p data-start=\"2785\" data-end=\"2814\">Adjust tension until correct.<\/p>\n<\/li>\n<li data-start=\"2815\" data-end=\"2850\">\n<p data-start=\"2818\" data-end=\"2850\">Tighten mounting bolts securely.<\/p>\n<\/li>\n<li data-start=\"2851\" data-end=\"2895\">\n<p data-start=\"2854\" data-end=\"2895\">Recheck tension after initial engine run.<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"2897\" data-end=\"2970\">&#x26a0;&#xfe0f; An overtightened belt can damage bearings. Too loose, and it may slip.<\/p>\n                    \t\t\t\t\t\n                                    <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/section><\/section>\n\n\n<section class=\"section  \">\n    \n<section id=\"content-block-1-block_383275d8564ea6c4b58e31b8bb10f4ed\" class=\"section content-block content-block--image \">\n    <div class=\"container\">\n        <div class=\"row d-flex align-items-center flex-md-row-reverse\">\n\n            <div class=\"col-md-6 col-lg-7 offset-lg-1\">\n                                    <div class=\"content-block__visuals\">\n                        <div class=\"content-block__media media--clipped media ratio\">\n                            <div class=\"media__wrapper\">\n                                <img decoding=\"async\" width=\"690\" height=\"388\" src=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-690x388.png\" class=\"media__source img-fit\" alt=\"marine diesel engine maintenance guide\" srcset=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-690x388.png 690w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-300x169.png 300w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-768x432.png 768w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-210x118.png 210w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-330x186.png 330w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-431x242.png 431w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-507x285.png 507w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-530x298.png 530w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-930x523.png 930w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173-1170x658.png 1170w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-12-16h36m58s173.png 1280w\" sizes=\"auto, (max-width: 575.98px) 431px, (max-width: 767.98px) 530px, (max-width: 991.98px) 330px, (max-width: 1279.98px) 530px, (max-width: 1899.98px) 690px, 930px\" loading=\"lazy\" \/>                            <\/div>\n                        <\/div>\n                    <\/div>\n                            <\/div>\n\n            <div class=\"col-md-6 col-lg-4\">\n                <div class=\"content-block__body\">\n                    \n                    \n                                            <h4 data-start=\"2977\" data-end=\"3012\">Checking and replacing coolant<\/h4>\n<p data-start=\"3014\" data-end=\"3118\">Coolant plays a crucial role in maintaining stable engine temperature and preventing internal corrosion.<\/p>\n<h5 data-start=\"3120\" data-end=\"3147\">When to replace coolant<\/h5>\n<ul data-start=\"3148\" data-end=\"3292\">\n<li data-start=\"3148\" data-end=\"3212\">\n<p data-start=\"3150\" data-end=\"3212\">According to the engine service schedule (often every 2 years)<\/p>\n<\/li>\n<li data-start=\"3213\" data-end=\"3255\">\n<p data-start=\"3215\" data-end=\"3255\">If coolant appears dirty or contaminated<\/p>\n<\/li>\n<li data-start=\"3256\" data-end=\"3292\">\n<p data-start=\"3258\" data-end=\"3292\">If corrosion protection is reduced<\/p>\n<\/li>\n<\/ul>\n<h5 data-start=\"3294\" data-end=\"3322\">Coolant service overview<\/h5>\n<ol data-start=\"3324\" data-end=\"3591\">\n<li data-start=\"3324\" data-end=\"3353\">\n<p data-start=\"3327\" data-end=\"3353\">Ensure the engine is cool.<\/p>\n<\/li>\n<li data-start=\"3354\" data-end=\"3414\">\n<p data-start=\"3357\" data-end=\"3414\">Open the drain point and collect old coolant responsibly.<\/p>\n<\/li>\n<li data-start=\"3415\" data-end=\"3447\">\n<p data-start=\"3418\" data-end=\"3447\">Flush the system if required.<\/p>\n<\/li>\n<li data-start=\"3448\" data-end=\"3510\">\n<p data-start=\"3451\" data-end=\"3510\">Refill with the recommended VETUS-approved coolant mixture.<\/p>\n<\/li>\n<li data-start=\"3511\" data-end=\"3553\">\n<p data-start=\"3514\" data-end=\"3553\">Bleed air from the system if necessary.<\/p>\n<\/li>\n<li data-start=\"3554\" data-end=\"3591\">\n<p data-start=\"3557\" data-end=\"3591\">Run the engine and recheck levels.<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"3593\" data-end=\"3671\">&#x1f30a; Always dispose of old coolant according to local environmental regulations.<\/p>\n                    \t\t\t\t\t\n                                    <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/section><\/section>\n\n<section class=\"section section--colored bg-light content-blocks bg-light   \">\n    \n\n<section id=\"section-text-block-block_a53b7200fe2b5a58fa3277935bcec88e\" class=\"section text-block \">\n                    <div class=\"section section__body\">\n            <div class=\"text-block\">\n                <div class=\"container\">\n                    <div class=\"row\">\n                        <div class=\"col-lg-8 offset-lg-2\">\n                                                            <div class=\"section__content single__content hentry\">\n                                    <h4 data-start=\"3678\" data-end=\"3715\">Maintenance schedule recommendation<\/h4>\n<p data-start=\"3717\" data-end=\"3741\">For optimal performance:<\/p>\n<ul data-start=\"3743\" data-end=\"3940\">\n<li data-start=\"3743\" data-end=\"3780\">\n<p data-start=\"3745\" data-end=\"3780\">Inspect the <strong data-start=\"3757\" data-end=\"3769\">impeller<\/strong> annually<\/p>\n<\/li>\n<li data-start=\"3781\" data-end=\"3819\">\n<p data-start=\"3783\" data-end=\"3819\">Check <strong data-start=\"3789\" data-end=\"3807\">V-belt tension<\/strong> regularly<\/p>\n<\/li>\n<li data-start=\"3820\" data-end=\"3877\">\n<p data-start=\"3822\" data-end=\"3877\">Replace <strong data-start=\"3830\" data-end=\"3841\">coolant<\/strong> according to the service interval<\/p>\n<\/li>\n<li data-start=\"3878\" data-end=\"3940\">\n<p data-start=\"3880\" data-end=\"3940\">Follow your VETUS engine manual for model-specific details<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3942\" data-end=\"4036\">Preventative maintenance is significantly more cost-effective than emergency repairs offshore.<\/p>\n                                <\/div>\n                            \n                                                    <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n        <\/div>\n    <\/section><\/section>\n\n\n<section class=\"section  \">\n    \n\n<section id=\"section-text-block-block_3f8cb494aeaeb735b9b64a9cf9cfb031\" class=\"section text-block \">\n                    <div class=\"section section__body\">\n            <div class=\"text-block\">\n                <div class=\"container\">\n                    <div class=\"row\">\n                        <div class=\"col-lg-8 offset-lg-2\">\n                                                            <div class=\"section__content single__content hentry\">\n                                    <h4><strong>Frequently asked questions (FAQ)<\/strong><\/h4>\n<h5 data-start=\"341\" data-end=\"405\">Can I replace the impeller without removing the entire pump?<\/h5>\n<p data-start=\"406\" data-end=\"579\">Yes, on most VETUS engines the impeller can be replaced by removing only the pump cover. However, access may vary depending on installation space in your engine compartment.<\/p>\n<h5 data-start=\"581\" data-end=\"633\">What should I do if impeller blades are missing?<\/h5>\n<p data-start=\"634\" data-end=\"815\">If vanes are missing, they may have entered the cooling system. It\u2019s important to locate and remove the fragments (often in the heat exchanger) to prevent blockages and overheating.<\/p>\n<h5 data-start=\"817\" data-end=\"866\">Can I tension a V-belt without special tools?<\/h5>\n<p data-start=\"867\" data-end=\"1039\">In most cases, no special tools are required \u2014 just standard spanners to loosen and adjust the alternator. However, always ensure proper alignment and avoid overtightening.<\/p>\n<h5 data-start=\"1041\" data-end=\"1090\">Can I top up coolant instead of replacing it?<\/h5>\n<p data-start=\"1091\" data-end=\"1260\">Topping up is fine if the level is slightly low, but it does not restore depleted corrosion inhibitors. Full replacement is required at the recommended service interval.<\/p>\n                                <\/div>\n                            \n                                                            <div class=\"section__actions text-block__actions actions\">\n                                    <div class=\"btn-group d-flex flex-wrap justify-content-center\">\n                                                                                    <a href=\"https:\/\/webshop.vetus.com\/en\/products\/spare-parts\/engine-spare-parts\" class=\"btn btn-primary\" title=\"\" target=\"\">\n                                                <span>View VETUS engine service kit<\/span>\n                                            <\/a>\n                                        \n                                                                            <\/div>\n                                <\/div>\n                                                    <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n        <\/div>\n    <\/section><\/section>\n\n\n<section class=\"section  \">\n    \n<section id=\"content-block-2-block_589a616e195c5bee2781ac8584ba63a5\" class=\"section content-block content-block--video \">\n    <div class=\"container\">\n        <div class=\"row d-flex align-items-center\">\n            <div class=\"col-md-6 col-lg-7\">\n\n                <div class=\"content-block__visuals\">\n                                            <div class=\"content-block__media media ratio\">\n                            <div class=\"media__wrapper\" x-data=\"video\">\n                                <div class=\"video-overlay video-overlay--cookies\" x-show=\"!cookiesAccepted\" x-cloak>\n                                    <span class=\"d-flex\">Please <a href=\"#\" class=\"mx-1\" @click.prevent=\"acceptCookies()\">accept<\/a> the advertisement cookie.<\/span>\n                                <\/div>\n                                <div class=\"video-overlay\" :class=\"{ 'is-hidden' : isPlaying }\" @click.prevent=\"playVideo\">\n                                    <button class=\"video-overlay__button btn btn-lg btn-outline-primary btn-icon-only\" type=\"button\">\n                                        <span class=\"sr-only\">Jouer la vid\u00e9o<\/span>\n                                        <i class=\"icon icon-play_arrow\"><\/i>\n                                    <\/button>\n                                    <img decoding=\"async\" width=\"690\" height=\"388\" src=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-690x388.png\" class=\"media__source img-fit\" alt=\"marine diesel engine maintenance guide\" srcset=\"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-690x388.png 690w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-300x169.png 300w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-768x432.png 768w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-210x118.png 210w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-330x186.png 330w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-431x242.png 431w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-507x285.png 507w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-530x298.png 530w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-930x523.png 930w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-1170x658.png 1170w, https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png 1280w\" sizes=\"auto, (max-width: 575.98px) 431px, (max-width: 767.98px) 530px, (max-width: 991.98px) 330px, (max-width: 1279.98px) 530px, (max-width: 1899.98px) 690px, 930px\" loading=\"lazy\" \/>                                <\/div>\n                                <div class=\"video video--youtube\" data-video=\"YP6bm9WBf24\"><\/div>\n                            <\/div>\n                        <\/div>\n                                    <\/div>\n            <\/div>\n\n            <div class=\"col-md-6 col-lg-4 offset-lg-1\">\n                <div class=\"content-block__body\">\n                                            <h3 class=\"content-block__title\">\n                            Discover all the details in our video                        <\/h3>\n                    \n                    \n                                            <p>Want to see the full process in action? Watch our complete step-by-step video tutorial.<\/p>\n<p><em><strong data-start=\"247\" data-end=\"286\">Technical validation and execution: <\/strong>Geert-Jan: Instructor &amp; Technical Trainer at VETUS<\/em><\/p>\n                    \n                    \n                <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/section><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":26,"featured_media":0,"parent":59197,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"tpl-blog-large-header.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-122047","page","type-page","status-publish","hentry"],"acf":{"image":{"ID":122031,"id":122031,"title":"vlcsnap-2026-02-16-13h51m03s945","filename":"vlcsnap-2026-02-16-13h51m03s945.png","filesize":1064185,"url":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","link":"https:\/\/vetus.com\/fr\/blog\/blog-m-line-maintenance-guide-part-2\/vlcsnap-2026-02-16-13h51m03s945-2\/","alt":"marine diesel engine maintenance guide","author":"26","description":"","caption":"","name":"vlcsnap-2026-02-16-13h51m03s945-2","status":"inherit","uploaded_to":122047,"date":"2026-02-17 07:36:55","modified":"2026-02-17 07:37:39","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/vetus.com\/wp-includes\/images\/media\/default.png","width":1280,"height":720,"sizes":{"thumbnail":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-150x150.png","thumbnail-width":150,"thumbnail-height":150,"medium":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-300x169.png","medium-width":300,"medium-height":169,"medium_large":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-768x432.png","medium_large-width":768,"medium_large-height":432,"large":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","large-width":1024,"large-height":576,"1536x1536":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","1536x1536-width":1280,"1536x1536-height":720,"2048x2048":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","2048x2048-width":1280,"2048x2048-height":720,"210w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-210x118.png","210w-width":210,"210w-height":118,"330w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-330x186.png","330w-width":330,"330w-height":186,"431w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-431x242.png","431w-width":431,"431w-height":242,"507w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-507x285.png","507w-width":507,"507w-height":285,"530w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-530x298.png","530w-width":530,"530w-height":298,"690w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-690x388.png","690w-width":690,"690w-height":388,"930w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-930x523.png","930w-width":930,"930w-height":523,"1170w":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945-1170x658.png","1170w-width":1170,"1170w-height":658,"gform-image-choice-sm":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","gform-image-choice-sm-width":300,"gform-image-choice-sm-height":169,"gform-image-choice-md":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","gform-image-choice-md-width":400,"gform-image-choice-md-height":225,"gform-image-choice-lg":"https:\/\/vetus.com\/wp-content\/uploads\/vlcsnap-2026-02-16-13h51m03s945.png","gform-image-choice-lg-width":600,"gform-image-choice-lg-height":338}},"introduction":"A step-by-step guide to VETUS marine diesel engine maintenance\r\n","person":false,"title":"How to service your marine diesel engine"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - 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