Sierra 18-3098 Neoprene Impeller with 6 Fins, Replaces Mercury Marine 47-16154-3, Fits Mercury/Mariner 3.3-6hp Outboards

The Sierra 18-3098 is a neoprene water pump impeller with 6 fins, built as a direct replacement for the water pump impeller in select Mercury/Mariner outboard motors. The impeller is the wear component inside the outboard's water pump housing that drives raw water through the cooling system to keep the powerhead running at a safe operating temperature; a worn, cracked, or missing fin on the impeller is one of the most common causes of outboard overheating. This impeller is designed as a like-for-like replacement, matching the original Mercury Marine part in fin count and fit so the water pump housing and wear plate seal correctly once it is installed.

Sierra manufactures this impeller for Mercury/Mariner shiftable 3.3hp outboards from 1993 and up, Mercury/Mariner 4/5hp 2-cycle outboards from 1987 and up, and Mercury/Mariner 4/5/6hp 4-Stroke outboards from 1999 and up. Because water pump impellers are wear items, Sierra recommends replacing this part on the manufacturer's recommended service interval, or any time the outboard shows signs of reduced water flow or overheating, to protect the engine from cooling system failure.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3098
• Material: Neoprene
• Fin Count: 6 Fins
• Color: White
• Weight: 0.04 pounds
• Unit Count: 1
• UPC: 808282101176
• OEM Cross Reference: MERCURY MARINE 47-16154-3

Fitment

• Mercury/Mariner shiftable 3.3hp, 1993 & Up
• Mercury/Mariner 4/5hp 2-cycle, 1987 & Up
• Mercury/Mariner 4/5/6hp 4-Stroke, 1999 & Up

Replaces (OEM)

• MERCURY MARINE 47-16154-3

Frequently Asked Questions

What outboard motors does the Sierra 18-3098 impeller fit? The Sierra 18-3098 fits Mercury/Mariner shiftable 3.3hp outboards from 1993 and up, Mercury/Mariner 4/5hp 2-cycle outboards from 1987 and up, and Mercury/Mariner 4/5/6hp 4-Stroke outboards from 1999 and up.

What OEM part number does the Sierra 18-3098 replace? It replaces Mercury Marine part number 47-16154-3, so it is a direct equivalent for that original impeller.

What material is the Sierra 18-3098 impeller made from? It is made from neoprene, the standard rubber compound used for outboard water pump impellers because it flexes against the pump housing to move cooling water.

How many fins does the Sierra 18-3098 impeller have? This impeller has 6 fins, matching the fin count of the original Mercury/Mariner impeller it replaces.

How much does the Sierra 18-3098 impeller weigh? The Sierra 18-3098 weighs 0.04 pounds.

How do I know if my outboard's impeller needs to be replaced? Reduced water flow from the tell-tale (pee hole), the engine running hotter than normal, or an overheat alarm are common signs that the water pump impeller, such as the Sierra 18-3098, has worn or cracked fins and needs replacement.

Is the Sierra 18-3098 a genuine Mercury part or aftermarket? The Sierra 18-3098 is a Sierra-branded aftermarket impeller manufactured as a direct replacement for Mercury Marine part 47-16154-3.

What color is the Sierra 18-3098 impeller? The Sierra 18-3098 impeller is white.

Does the Sierra 18-3098 come as a complete water pump kit? No, the Sierra 18-3098 is the impeller itself, sold as a single unit.

Will the Sierra 18-3098 fit a 2-cycle and a 4-stroke Mercury outboard? Yes, Sierra lists this same impeller for Mercury/Mariner 4/5hp 2-cycle outboards from 1987 and up as well as Mercury/Mariner 4/5/6hp 4-Stroke outboards from 1999 and up.

Is the Sierra 18-3098 covered by a warranty? Yes, the Sierra 18-3098 is covered under Sierra's manufacturer warranty against defects.