{"product_id":"yanmar-cover-gasket-129795-49551-4jh-series","title":"Yanmar Cover Gasket 129795-49551 — 4JH Series Marine Diesel Engine","description":"\u003ch2\u003eYanmar Cover Gasket 129795-49551\u003c\/h2\u003e\u003cp\u003eThis genuine Yanmar OEM cover gasket seals the inspection or timing cover on 4JH series marine diesel engines. Replacing this gasket during any cover removal is essential — reusing a compressed gasket is one of the most common causes of post-service oil leaks. The OEM part ensures exact material composition, thickness, and cut dimensions for a leak-free seal against Yanmar's machined mating surfaces.\u003c\/p\u003e\u003ch3\u003ePart Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 129795-49551\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Yanmar\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Engine Sealing \/ Cover Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM \/ Aftermarket:\u003c\/strong\u003e Genuine OEM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Family:\u003c\/strong\u003e Yanmar 4JH Series Marine Diesel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYanmar 4JH series marine diesel engines\u003c\/li\u003e\n\u003cli\u003eVerify fitment using your engine model number and serial number against the Yanmar parts diagram for your specific variant (4JH2, 4JH3, 4JH4, 4JHE, 4JH-TE, 4JH-HTE, 4JH-DTE)\u003c\/li\u003e\n\u003cli\u003eConsult your Yanmar service manual parts diagram to confirm cover position and gasket part number before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eService Interval\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eReplace any time the cover is removed — never reuse a previously compressed gasket\u003c\/li\u003e\n\u003cli\u003eInspect for oil seepage at every scheduled service interval (250 hours or annually)\u003c\/li\u003e\n\u003cli\u003eReplace immediately if oil weeping or seepage is observed at the cover joint\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eRelated Parts\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yanmar-oem-bonnet-gasket-valve-cover-121450-11310\"\u003eYanmar OEM Bonnet Gasket Valve Cover 121450-11310\u003c\/a\u003e — valve cover gasket for Yanmar diesel engines\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yanmar-oem-cover-gasket-3jh-series-123325-35140\"\u003eYanmar OEM Cover Gasket 3JH Series 123325-35140\u003c\/a\u003e — cover gasket for 3JH series engines\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yan-114\"\u003eYanmar Gasket Set 728171-92601\u003c\/a\u003e — complete gasket set for full engine service\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yanmar-oil-filter-4jh-129150-35170\"\u003eYanmar Oil Filter 4JH — OEM Part 129150-35170\u003c\/a\u003e — OEM oil filter for 4JH series service\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yanmar-oem-coolant-filler-cap-2ym-3ym-3jh-4jh-series-129673-44131\"\u003eYanmar OEM Coolant Filler Cap — 4JH Series 129673-44131\u003c\/a\u003e — cooling system service item for 4JH engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I reuse this gasket if the cover was only briefly removed?\u003c\/strong\u003e\u003cbr\u003eA: No. Cover gaskets compress and conform to surface irregularities on first installation. Even brief removal breaks that seal. Always install a new gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Do I need sealant with this gasket?\u003c\/strong\u003e\u003cbr\u003eA: Yanmar OEM gaskets are typically installed dry. Do not add RTV or sealant unless specifically called out in your Yanmar service manual for this cover position.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What torque spec should I use?\u003c\/strong\u003e\u003cbr\u003eA: Follow the torque sequence and values in your Yanmar 4JH service manual. Uneven torquing is a leading cause of gasket failure and cover warping.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this is the right gasket for my engine?\u003c\/strong\u003e\u003cbr\u003eA: Cross-reference your engine model and serial number with the Yanmar parts diagram for your specific 4JH variant. The serial number determines which sub-variant and parts revision applies.\u003c\/p\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThis gasket comes up most often during timing cover or inspection cover service on 4JH engines — typically when a mechanic is in the engine for a belt service, injector work, or investigating an oil seep at the front of the engine. The most common mistake we see is customers trying to reuse the old gasket or using a generic cut gasket that doesn't match the bolt pattern exactly. Always replace with OEM. If you're seeing a slow oil weep at the cover and the fasteners are already at spec, the gasket has likely taken a set and needs replacement — retorquing won't fix it. If you're doing a full service, consider ordering the complete gasket set alongside this part to cover everything in one visit.\u003c\/p\u003e","brand":"YAN","offers":[{"title":"Default Title","offer_id":43564307873828,"sku":"129795-49551","price":5.18,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/129795-49551.png?v=1771183113","url":"https:\/\/marisolmarine.com\/products\/yanmar-cover-gasket-129795-49551-4jh-series","provider":"Marisol Marine Company","version":"1.0","type":"link"}