Sierra 18-3047 Impeller Kit, Neoprene, Fits Crusader 305, 350 & 454 CID Engines

The Sierra 18-3047 Impeller Kit is a neoprene water pump impeller kit built to circulate raw cooling water through the engine's water pump on Crusader 305, 350, and 454 CID engines. The kit includes the 18-3061 impeller, a 12-fin neoprene component engineered to maintain consistent water flow and prevent overheating during operation. Neoprene construction offers strong resistance to heat, oil, and wear from continuous pump cycling, making it a durable choice for regular replacement intervals or as a spare kept onboard.

This impeller is interchangeable with common OEM and aftermarket cross-reference numbers, giving boat owners a reliable option when the original part number is not readily available. Installation follows standard water pump service procedures: the impeller seats inside the pump housing and its flexible fins draw and push water through the cooling circuit as the engine runs. Regular impeller replacement helps prevent dry-running damage and keeps engine temperatures within normal operating range.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3047
• Product Type: Impeller Kit
• Includes: 18-3061 Impeller
• Material: Neoprene
• Number of Fins: 12
• Fitment: Crusader 305, 350, & 454 CID engines
• Weight: 0.5 pounds
• Number of Items: 1
• UPC: 808282243784
• OEM Cross Reference: GLM 89621, Jabsco 18948-0001, Mallory 9-45706, Sherwood 10615K, Volvo Penta 835874

Fitment

Crusader 305, 350, & 454 CID engines.

Replaces (OEM)

GLM 89621, Jabsco 18948-0001, Mallory 9-45706, Sherwood 10615K, Volvo Penta 835874

Frequently Asked Questions

What engines does the Sierra 18-3047 impeller kit fit? The Sierra 18-3047 impeller kit fits Crusader 305, 350, and 454 CID engines.

What is included in the 18-3047 kit? The kit includes the 18-3061 neoprene impeller, ready to install in the engine's water pump.

How many fins does the impeller have? The impeller has 12 fins, which draw and circulate raw water through the cooling system.

What material is the 18-3047 impeller made from? It is made from neoprene, chosen for its resistance to heat, oil, and repeated flexing during pump operation.

Is the Sierra 18-3047 a genuine OEM part or an aftermarket replacement? Sierra 18-3047 is an aftermarket impeller kit manufactured to meet or exceed the performance of the original equipment part it replaces.

Which OEM part numbers does 18-3047 cross-reference with? It is interchangeable with GLM 89621, Jabsco 18948-0001, Mallory 9-45706, Sherwood 10615K, and Volvo Penta 835874.

Does the Sherwood 10615K impeller cross to the Sierra 18-3047? Yes, Sherwood 10615K is listed as an interchangeable cross-reference for the Sierra 18-3047 impeller kit.

How much does the 18-3047 impeller kit weigh? The Sierra 18-3047 impeller kit weighs 0.5 pounds.

How many impellers come in one 18-3047 kit? One 18-3047 kit contains a single 18-3061 neoprene impeller.

Will this impeller work with a Volvo Penta 835874 pump? Yes, the Sierra 18-3047 is listed as interchangeable with Volvo Penta 835874.

How do I know when to replace the impeller in my water pump? A worn or cracked impeller reduces raw water flow and can lead to engine overheating; the Sierra 18-3047 kit provides a direct replacement impeller for Crusader 305, 350, and 454 CID engines when service is due.

Is the Sierra 18-3047 impeller compatible with Mallory 9-45706 applications? Yes, Mallory 9-45706 is one of the OEM cross-reference numbers for the Sierra 18-3047 impeller kit.