Sierra 18-3150 Water Pump Impeller Kit with Housing Body for MerCruiser Alpha Bravo I II III GLM Engines

Rebuild kit for plastic body seawater pumps on Bravo drives

Restore your MerCruiser raw water cooling system to factory-spec performance with the Sierra 18-3150 Water Pump Impeller Kit. Engineered specifically for MerCruiser Alpha One and Bravo I/II/III stern drives with one-piece impeller housings, this comprehensive kit includes every component needed for a complete pump rebuild no hunting for missing hardware or making multiple trips to the parts counter. The kit contains a new 1-piece plastic housing, 8-vane rubber impeller, stainless steel wear plate, O-rings, and mounting bolts, all manufactured to meet or exceed OEM specifications.

Sierra Impellers are individually molded to precise tolerances and inspected for proper bonding and performance prior to leaving the factory, ensuring a reliable fit that minimizes installation labor. An exact match to MerCruiser OEM part number 46-807151A14 (also interchangeable with 807151A7), the 18-3150 is also cross-referenced with GLM 12088 and Mallory 9-48350. With over 50 years supplying OEM-equivalent marine parts to engine manufacturers and boat builders, Sierra delivers the quality assurance that professional technicians and DIY boaters depend on.

Backed by Sierra's industry-leading lifetime limited warranty, this kit is the smart choice for routine impeller service or emergency cooling system repair.

Key Features

• Meets or exceeds manufacturer specifications
• Complete kit provides all you will need to rebuild water pump
• Compatible with MerCruiser Bravo drives
• Backed by SeaStar Solutions Limited Two-Year Warranty

The Sierra Engine Parts Selector

In addition to water pump kits, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.

Sierra 18-3150 comes complete with NEW 1-Piece Plastic Housing, Impeller, Stainless Steel Plate, O-Rings, and Bolts. Sierra Impellers are molded to maintain high-quality standards and have been inspected and tested for proper bonding and performance. Exact fit minimizes labor required for installation. All components are manufactured from premium materials and held to stringent quality standards to ensure long-lasting performance Replaces: Mercury/MerCruiser Stern Drive 46-807151A14, 807151A7, and GLM 12088

Sierra Limited Lifetime Warranty