{"product_id":"sierra-18-9794-gear-lube-adapter-replaces-mercury-91-883704q03-fits-nissan-yamaha-honda-tohatsu-outboards-metric-8-1-25-thread","title":"Sierra Gear Lube Adapter 18-9794, Replaces Mercury 91-883704Q03, Fits Nissan Yamaha Honda Tohatsu Outboards","description":"\u003cp\u003eThe Sierra 18-9794 Gear Lube Adapter is a tapered, unthreaded hose end fitting that lets you fill an outboard lower unit with gear lube using a Sierra quart pump or a lower unit fill tube. It is designed for use with Sierra's 18-9600-5, 18-9620-5, and 18-9650-5 quart pumps, giving you a secure, drip-resistant connection between the pump hose and the lower unit fill port. The adapter is built with a metric 8-1.25 thread to match the fill port thread pattern on compatible outboards, and it replaces Mercury part number 91-883704Q03, making it a direct-fit swap when servicing lower units that call for that Mercury adapter. It is intended for use on Nissan, Yamaha, Honda, and Tohatsu outboard lower units, covering a wide range of common outboard brands serviced in the field or in the shop. Because the fitting is tapered and unthreaded at the hose end, it seats into the pump hose without requiring additional clamps or threading, simplifying routine gear lube changes and reducing spill risk during service. This adapter is a small but essential accessory for anyone performing regular lower unit maintenance, and it is sized to work alongside standard Sierra quart pump equipment already used in most marine service bays.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-9794\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Gear Lube Adapter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Style:\u003c\/strong\u003e Tapered, unthreaded hose end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e Metric 8-1.25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e Sierra 18-9600-5, 18-9620-5, and 18-9650-5 quart pumps, or lower unit fill tubes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.6 inches L x 2 inches W x 0.5 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNissan outboards\u003c\/li\u003e\n\u003cli\u003eYamaha outboards\u003c\/li\u003e\n\u003cli\u003eHonda outboards\u003c\/li\u003e\n\u003cli\u003eTohatsu outboards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 91-883704Q03\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-9794 Gear Lube Adapter used for?\u003c\/strong\u003e It connects a Sierra quart pump or lower unit fill tube to an outboard's gear lube fill port, letting you add or change lower unit gear lube without spilling or having to thread a separate fitting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich outboard brands does the 18-9794 fit?\u003c\/strong\u003e This adapter is designed for Nissan, Yamaha, Honda, and Tohatsu outboard lower units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercury part number does the 18-9794 replace?\u003c\/strong\u003e The Sierra 18-9794 replaces Mercury part number 91-883704Q03, so it can be used as a direct substitute where that Mercury adapter is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does this gear lube adapter have?\u003c\/strong\u003e The 18-9794 uses a metric 8-1.25 thread to match the fill port on compatible outboard lower units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the hose end threaded or unthreaded on the 18-9794?\u003c\/strong\u003e The hose end of the 18-9794 is tapered and unthreaded, so it seats into the pump hose without needing extra clamps or threading.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Sierra pumps does the 18-9794 adapter work with?\u003c\/strong\u003e It is designed for use with Sierra's 18-9600-5, 18-9620-5, and 18-9650-5 quart pumps, as well as standard lower unit fill tubes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-9794 adapter weigh?\u003c\/strong\u003e The Sierra 18-9794 Gear Lube Adapter weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-9794?\u003c\/strong\u003e The adapter measures 0.6 inches long by 2 inches wide by 0.5 inches high.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-9794 fit Suzuki lower units?\u003c\/strong\u003e No, the 18-9794 is designed for Nissan, Yamaha, Honda, and Tohatsu lower units; Suzuki lower units use the separate Sierra 18-9795 adapter with a metric 10-1.25 thread.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many adapters come in the package?\u003c\/strong\u003e Each Sierra 18-9794 order includes one gear lube adapter (package quantity of 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-9794 an OEM or aftermarket part?\u003c\/strong\u003e The 18-9794 is a Sierra-branded adapter engineered to replace Mercury 91-883704Q03, offering equivalent fit and function to the original Mercury adapter.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988437381339,"sku":"SIE-18-9794","price":6.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-9794_lg__08259.1558132878.500.750.jpg?v=1785188923","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-9794-gear-lube-adapter-replaces-mercury-91-883704q03-fits-nissan-yamaha-honda-tohatsu-outboards-metric-8-1-25-thread","provider":"Good Vibes Marina","version":"1.0","type":"link"}