Sierra 18-3570 Water Pump Kit - Replaces Mercury Marine 817275A1, 817275A2 - Fits MerCruiser Alpha I Generation II & Vazer

The Sierra 18-3570 Water Pump Kit is a complete rebuild kit for MerCruiser Alpha I Generation II and Vazer outdrives, serial number 0D494569 and above. Rather than sourcing individual water pump components separately, the kit bundles every part needed for a full water pump service into a single part number: a face seal and installation tool, impeller, impeller plate, O-ring, and the full set of gaskets required for reassembly, including the seal ring gasket, drain screw gasket, water pump gasket, and cover gasket. This kit cross-references to the Mercury Marine 817275A1 and 817275A2 water pump assembly, making it a direct match for boaters replacing a worn or failing pump on covered Alpha I Generation II and Vazer drives.

The impeller included in the kit is the Sierra 18-3056, engineered to move cooling water through the drive and engine to prevent overheating. A worn impeller is one of the most common causes of overheating and reduced cooling flow, and Sierra recommends replacing the entire pump kit together so that the impeller, seals, and gaskets are refreshed as a set rather than individually. Each Sierra part is built to meet or exceed the quality of the original equipment part it replaces. The kit is finished in white and weighs 1.55 pounds as packaged.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3570
• Product Type: Water Pump Kit
• Weight: 1.55 pounds
• Color: White
• Kit Contents: 18-2599 Face Seal and Tool, 18-3056 Impeller, 18-3122 Impeller Plate, 18-7420 O-Ring, 18-2944 Seal Ring Gasket, 18-2945 Drain Screw Gasket, 18-2564 Water Pump Gasket, 18-2566 Cover Gasket
• Fitment: MerCruiser Alpha I - Generation II & Vazer, serial number 0D494569 and above
• OEM Cross-Reference: Mercury Marine 817275A1, 817275A2
• UPC: 808282112905

Fitment

• MerCruiser Alpha I - Generation II & Vazer, serial number 0D494569 and above

Replaces (OEM)

• 817275A1 (Mercury Marine)
• 817275A2 (Mercury Marine)

Frequently Asked Questions

What does the Sierra 18-3570 Water Pump Kit include? The kit includes a face seal and installation tool (18-2599), impeller (18-3056), impeller plate (18-3122), O-ring (18-7420), seal ring gasket (18-2944), drain screw gasket (18-2945), water pump gasket (18-2564), and cover gasket (18-2566).

What MerCruiser drives does the 18-3570 fit? It fits MerCruiser Alpha I - Generation II and Vazer drives with serial number 0D494569 and above.

Is the 18-3570 a direct replacement for Mercury Marine 817275A1? Yes, the Sierra 18-3570 Water Pump Kit cross-references to Mercury Marine 817275A1 and 817275A2 and is built to meet or exceed the original equipment part it replaces.

How much does the Sierra 18-3570 Water Pump Kit weigh? The kit weighs 1.55 pounds.

What color is the Sierra 18-3570 kit finished in? The Sierra 18-3570 Water Pump Kit is finished in white.

Does the 18-3570 kit include the impeller? Yes, the kit includes the Sierra 18-3056 impeller as one of its components.

Does the kit come with a face seal for installation? A face seal and installation tool, part number 18-2599, is included in the 18-3570 kit.

What gaskets are included in the 18-3570 water pump kit? Four gaskets are included: the 18-2944 seal ring gasket, 18-2945 drain screw gasket, 18-2564 water pump gasket, and 18-2566 cover gasket.

Is Sierra 18-3570 a genuine Sierra part or an aftermarket copy? It is a genuine Sierra part, manufactured to meet or exceed the quality of the original equipment component it replaces.

What is the UPC for the Sierra 18-3570 Water Pump Kit? The UPC for the 18-3570 kit is 808282112905.

Does the 18-3570 kit include an O-ring? Yes, an 18-7420 O-ring is included as part of the 18-3570 water pump kit.

What serial number range does the 18-3570 cover on Alpha I Generation II drives? The 18-3570 kit covers MerCruiser Alpha I - Generation II and Vazer drives with serial number 0D494569 and above.