Sierra 18-3147 Water Pump Kit, Replaces MerCruiser 817275T4, Fits Alpha One Generation II and Vazer

The Sierra 18-3147 Water Pump Kit is a replacement raw water pump kit built for MerCruiser Alpha One Generation II and Vazer sterndrive units with serial number 0D494569 and above. This kit restores proper raw water circulation through the cooling system, which is essential for keeping the engine and exhaust components running at safe operating temperatures. The pump housing and related components are constructed of cast iron for durability in a marine environment, standing up to constant exposure to raw water, salt, and vibration.

This kit is designed as a direct equivalent to the original equipment water pump components used on covered MerCruiser Alpha One Generation II and Vazer drives, and it is built to meet or exceed the quality of the original part it replaces. Because raw water pump performance is fit-specific, boat owners should confirm their drive unit and serial number against the fitment listed here before ordering to make sure the 18-3147 is the correct kit for their MerCruiser Alpha One Generation II or Vazer drive.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3147
• Product Type: Water Pump Kit
• Material: Cast Iron
• Weight: 1.69 pounds
• Fitment: MerCruiser Alpha One Generation II and Vazer, serial number 0D494569 and above
• OEM Cross Reference: Mallory 9-48315, MerCruiser 817275T4, MerCruiser 817275K05
• UPC: 808282112844
• Warranty: 90 days

Fitment

• MerCruiser Alpha One Generation II and Vazer, serial number 0D494569 and above

Replaces (OEM)

• Mallory 9-48315
• MerCruiser 817275T4
• MerCruiser 817275K05

Frequently Asked Questions

What does the Sierra 18-3147 Water Pump Kit fit? This kit fits MerCruiser Alpha One Generation II and Vazer sterndrive units with serial number 0D494569 and above. Confirm your drive's serial number before ordering since raw water pump fitment is serial-specific.

Is the Sierra 18-3147 the same as MerCruiser 817275T4? Yes, MerCruiser 817275T4 is a direct OEM cross reference for the Sierra 18-3147 Water Pump Kit, along with MerCruiser 817275K05 and Mallory 9-48315.

What is the Sierra 18-3147 Water Pump Kit made of? The 18-3147 Water Pump Kit is made of cast iron, chosen for its durability against constant raw water exposure and vibration in a marine drive.

How much does the Sierra 18-3147 Water Pump Kit weigh? The 18-3147 Water Pump Kit weighs 1.69 pounds.

Will the 18-3147 work on any MerCruiser Alpha One drive? No. The Sierra 18-3147 is specific to Alpha One Generation II and Vazer units with serial number 0D494569 and above; earlier serial ranges and other Alpha One configurations use different Sierra part numbers.

Is Sierra 18-3147 an aftermarket or genuine MerCruiser part? The 18-3147 is a Sierra-branded aftermarket water pump kit engineered to meet or exceed the quality of the original MerCruiser 817275T4 pump it replaces, not a MerCruiser-branded part.

What OEM part numbers does the Sierra 18-3147 cross reference to? The 18-3147 Water Pump Kit cross references to MerCruiser 817275T4, MerCruiser 817275K05, and Mallory 9-48315.

Does the 18-3147 kit come with a warranty? Yes, the Sierra 18-3147 Water Pump Kit carries a 90 day manufacturer warranty.

What is the UPC for the Sierra 18-3147 Water Pump Kit? The UPC for the Sierra 18-3147 Water Pump Kit is 808282112844.

Why does raw water pump fitment matter so much on MerCruiser drives? MerCruiser water pump components changed across serial number ranges and drive generations, so a kit like the 18-3147 that fits Alpha One Generation II and Vazer units at serial 0D494569 and above will not necessarily fit an earlier serial range or a different drive type.