{"product_id":"sierra-18-3357-water-pump-insert-cup-replaces-oem-646-44322-00-00","title":"Sierra Water Pump Plate 18-3357 for Yamaha 2 HP Outboards","description":"\u003cp\u003eThe Sierra 18-3357 is a water pump plate designed as a replacement component within the water pump assembly of Yamaha 2 HP outboard motors. This plate sits within the lower unit water pump housing and works alongside the impeller, cup, and seal to maintain proper water flow for engine cooling. Keeping this plate in good condition, along with the rest of the water pump components, helps ensure the impeller seats and seals correctly against the housing so the pump can draw and circulate cooling water as intended.\u003c\/p\u003e\u003cp\u003eThis plate is identified by Sierra part number 18-3357 and is built to fit Yamaha 2 HP outboards from the 1984-87 and 1988-02 model years. It is a lightweight component at 0.03 pounds, sized specifically for the water pump assembly on these outboards. When servicing a water pump on a compatible Yamaha 2 HP motor, this plate is typically replaced together with the associated impeller, cup, and seal to restore full cooling performance.\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 18-3357\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Water Pump Plate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282226701\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Yamaha 2 HP outboards, 1984-87 and 1988-02\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha 2 HP outboards, model years 1984-87\u003c\/li\u003e\n\u003cli\u003eYamaha 2 HP outboards, model years 1988-02\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3357 plate used for?\u003c\/strong\u003e The Sierra 18-3357 is a water pump plate that fits within the water pump assembly of Yamaha 2 HP outboards, working with the impeller, cup, and seal to support proper cooling water circulation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich outboards does the 18-3357 plate fit?\u003c\/strong\u003e This plate fits Yamaha 2 HP outboards from the 1984-87 model years as well as Yamaha 2 HP outboards from the 1988-02 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3357 plate fit Yamaha outboards other than the 2 HP model?\u003c\/strong\u003e No, the 18-3357 plate is specified for Yamaha 2 HP outboards only, covering the 1984-87 and 1988-02 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3357 water pump plate weigh?\u003c\/strong\u003e The Sierra 18-3357 water pump plate weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the water pump plate be replaced along with the impeller?\u003c\/strong\u003e Yes, when servicing the water pump on a compatible Yamaha 2 HP outboard, the 18-3357 plate is typically replaced together with the impeller, cup, and seal to restore full cooling performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3357 a Sierra part number or an OEM Yamaha number?\u003c\/strong\u003e 18-3357 is the Sierra part number used to identify this water pump plate for Yamaha 2 HP outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3357 plate come with a full water pump kit?\u003c\/strong\u003e No, the 18-3357 is the individual plate component; it is sold on its own and is not the same as a complete water pump kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the water pump plate do inside the pump housing?\u003c\/strong\u003e Within the water pump housing on a Yamaha 2 HP outboard, the 18-3357 plate helps the impeller and related components seat and seal properly so the pump can draw and circulate cooling water.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3357 a genuine Sierra part?\u003c\/strong\u003e Yes, the 18-3357 water pump plate is a Sierra-branded marine part made for Yamaha 2 HP outboard water pump service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my Yamaha 2 HP outboard needs this plate replaced?\u003c\/strong\u003e If the water pump on a Yamaha 2 HP outboard (1984-87 or 1988-02) is being serviced due to reduced cooling water flow, the plate, along with the impeller, cup, and seal, should be inspected and replaced as part of the repair.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988144664795,"sku":"SIE-18-3357","price":2.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3357_lg__43778.1558125937.500.750.jpg?v=1785329192","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3357-water-pump-insert-cup-replaces-oem-646-44322-00-00","provider":"Good Vibes Marina","version":"1.0","type":"link"}