Sierra Impeller Kit 18-3016-1 for MerCruiser Bravo and Inboard Brass Sea Water Pumps

The Sierra 18-3016-1 Impeller Kit is a brass, round-profile impeller kit built to restore water flow in MerCruiser brass sea water pumps. It is designed for Bravo and inboard drives fitted with a brass pump body, covering units with serial number 0M100001 and above, as well as MCM 45L MPI and 2000 and newer MCM V-6 and V-8 (305, 350 and 496 cid) engines equipped with the brass sea water pump. The impeller is the wear component inside the raw water pump that circulates cooling water through the engine, and it should be replaced on a regular service interval or whenever cooling performance drops, since a worn or cracked impeller can lead to overheating.

This kit includes the impeller along with the matching gasket needed for the reinstall, so the pump housing can be resealed properly during the service. The brass construction and round shape match the original equipment brass pump design, making this a straightforward, direct-fit service part rather than a full pump housing replacement. Sierra manufactures this part to meet or exceed the performance of the original equipment component it replaces, and it is built for the demands of marine cooling systems.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3016-1
• Product Type: Impeller Kit
• Included Components: Impeller and gasket
• Material: Brass
• Shape: Round
• Weight: 0.27 pounds
• UPC: 808282199937

Fitment

• MerCruiser Bravo and inboard engines with a brass pump body, serial number 0M100001 and above
• MerCruiser MCM 45L MPI
• 2000 and newer MerCruiser V-6 and V-8 (305, 350 and 496 cid) engines equipped with the brass sea water pump

Frequently Asked Questions

What engines does the Sierra 18-3016-1 impeller kit fit? The 18-3016-1 kit fits MerCruiser Bravo and inboard drives equipped with a brass pump body, serial number 0M100001 and above, as well as MCM 45L MPI and 2000 and newer MCM V-6 and V-8 (305, 350 and 496 cid) engines that use the brass sea water pump.

Does this kit include a gasket? Yes, the Sierra 18-3016-1 Impeller Kit includes the impeller along with the matching gasket needed to reseal the pump housing during installation.

What material is the 18-3016-1 impeller made from? This is a brass impeller kit, with a round-shaped impeller matching the original equipment brass pump design.

How much does the 18-3016-1 impeller kit weigh? The Sierra 18-3016-1 Impeller Kit weighs 0.27 pounds.

Will this impeller work on a plastic pump body? No. The 18-3016-1 is designated for brass pump body applications; MerCruiser units with a plastic pump body use a different Sierra part number.

Is the 18-3016-1 a genuine Sierra part or aftermarket equivalent? It is a genuine Sierra part, manufactured to meet or exceed the performance of the original equipment sea water pump impeller it replaces.

How do I know if my MerCruiser has the brass sea water pump this kit is designed for? The 18-3016-1 impeller kit is intended for MerCruiser Bravo and inboard engines with a brass pump body, serial number 0M100001 and above; checking your engine's serial number and pump body material will confirm compatibility.

What is included in the Sierra 18-3016-1 kit? The kit contains one brass, round impeller and the corresponding gasket for reinstallation on the sea water pump.

Does the 18-3016-1 fit the MCM 45L MPI engine? Yes, the Sierra 18-3016-1 Impeller Kit is listed as fitting the MCM 45L MPI engine along with 2000 and newer MCM V-6 and V-8 (305, 350 and 496 cid) engines using the brass sea water pump.

When should the impeller in a MerCruiser sea water pump be replaced? The impeller is a wear item inside the sea water pump, and the 18-3016-1 kit is used to replace it during routine service or when reduced cooling water flow is noticed, since a worn impeller can contribute to engine overheating.

Is the 18-3016-1 a complete water pump or just the impeller? The 18-3016-1 is an impeller kit consisting of the impeller and gasket, not a full water pump housing assembly.