Sierra 18-3517 Water Pump Kit for Mercruiser I/R/MR/Alpha Drives and Mercury/Mariner 65 HP-V6 Outboards

The Sierra 18-3517 Water Pump Kit is a repair kit for the water pump on Mercruiser I/R/MR/Alpha sterndrives and select Mercury/Mariner outboards. It is designed to restore proper cooling water flow to the engine by replacing the wearable components of the water pump assembly. This kit does not include the water pump base; it is intended for owners replacing the internal wear components rather than the full pump housing.

On Mercruiser applications, the 18-3517 fits I/R/MR/Alpha drives within serial number range 2495186 through 0D594568. On outboard applications, it fits Mercury/Mariner 65 hp (4 cylinder) through V-6 outboards equipped with short-vane impellers. Because the correct water pump component often differs by serial number break and drive type, confirming your unit's serial number against the ranges below helps ensure correct fitment before ordering.

The kit is built to match the fit, form, and function of the original equipment parts it replaces, including Mercury Marine 46-96148A5 and 46-60367A1, so it installs using the same hardware and procedure as the original.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3517
• Product Type: Water Pump Kit
• Weight: 0.77 pounds
• Included Components: Water pump kit components (does not include water pump base)
• OEM Cross Reference: 46-96148A5, 46-60367A1
• UPC: 030999315984

Fitment

• Mercruiser I/R/MR/Alpha drives, serial numbers 2495186 through 0D594568
• Mercury/Mariner 65 hp (4 cylinder) through V-6 outboards with short-vane impellers

Replaces (OEM)

• 46-96148A5
• 46-60367A1

Frequently Asked Questions

What drives does the Sierra 18-3517 water pump kit fit? The Sierra 18-3517 fits Mercruiser I/R/MR/Alpha drives within serial number range 2495186 through 0D594568.

Does the 18-3517 fit any outboard motors? Yes, it also fits Mercury/Mariner 65 hp (4 cylinder) through V-6 outboards that use short-vane impellers.

Does this kit include the water pump base? No. The Sierra 18-3517 kit does not include the water pump base; it covers the other components of the water pump assembly.

What OEM part numbers does the Sierra 18-3517 replace? It replaces Mercury Marine part numbers 46-96148A5 and 46-60367A1.

How much does the Sierra 18-3517 water pump kit weigh? The kit weighs 0.77 pounds.

How do I know if my Mercruiser drive uses the 18-3517? Check your drive's serial number; the 18-3517 applies to Mercruiser I/R/MR/Alpha drives with serial numbers between 2495186 and 0D594568.

Is the Sierra 18-3517 a direct replacement for the Mercury OEM water pump parts? Yes, the 18-3517 is built to match the fit and function of Mercury Marine 46-96148A5 and 46-60367A1 for direct installation.

What is included in the Sierra 18-3517 kit? The 18-3517 kit includes the water pump kit components used to service the pump, excluding the water pump base.

Will the 18-3517 work with any Mercury outboard horsepower? It is designed for Mercury/Mariner outboards from 65 hp (4 cylinder) up through V-6 models that use short-vane impellers, not all outboard horsepower ranges.

Can I use the 18-3517 if my drive has been retrofitted to an Alpha-style lower unit? Fitment for the 18-3517 is based on the original serial number range for I/R/MR/Alpha drives; confirm your specific drive configuration before ordering.

What brand manufactures the 18-3517 water pump kit? The 18-3517 water pump kit is manufactured by Sierra.

Is 18-3517 the correct part number to order for this kit? Yes, 18-3517 is the Sierra part number for this water pump kit.