Sierra Water Pump Repair Kit without Housing 18-3494, Replaces 6CJ-W0078-00-00, Fits Yamaha F70A (2010-17)

The Sierra 18-3494 Water Pump Repair Kit is a without-housing rebuild kit for Yamaha F70A outboards, designed to restore cooling system performance without requiring a full water pump housing replacement. The kit supplies the key wear and sealing components needed for a water pump service: an O-ring, a water pump housing cover, and a cup insert, giving the installer the parts most commonly worn or damaged during normal water pump servicing.

This kit cross-references directly to Yamaha OEM part number 6CJ-W0078-00-00 and is built to fit the Yamaha F70A (2010-17). Because it omits the housing itself, it is intended for rebuilds where the existing housing is still serviceable, letting the boat owner or technician replace only the components that typically fail first. Each included part is manufactured to match OEM fit and function, making this a straightforward drop-in service kit for routine water pump maintenance.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3494
• Product Type: Water Pump Repair Kit (without Housing)
• Material: Stainless Steel
• Weight: 0.7 pounds
• UPC: 808282376932
• Included Components: O-Ring (93210-59MG7, Qty 1); Cover, Water Pump Housing (18-9083, O.E. 63D-44312-00, Qty 1); Cup, Insert (18-3449)
• OEM Cross-Reference: 6CJ-W0078-00-00

Fitment

• Yamaha F70A (2010-17)

Replaces (OEM)

• 6CJ-W0078-00-00

Frequently Asked Questions

What does the Sierra 18-3494 water pump kit fit? This kit fits the Yamaha F70A (2010-17) outboard.

Is the 18-3494 kit equivalent to an OEM part number? Yes, Sierra 18-3494 cross-references directly to Yamaha OEM part number 6CJ-W0078-00-00.

Does this kit include the water pump housing? No, part number 18-3494 is a water pump repair kit without housing, so the housing itself is not included.

What parts are included in the box? The 18-3494 kit includes an O-ring (93210-59MG7), a water pump housing cover (18-9083, O.E. 63D-44312-00), and a cup insert (18-3449).

How much does the 18-3494 water pump kit weigh? The Sierra 18-3494 water pump repair kit weighs 0.7 pounds.

What material are the components made from? The components in the Sierra 18-3494 kit are made from stainless steel.

Why buy a kit without housing instead of a full water pump kit? A without-housing kit like the 18-3494 is meant for rebuilds where the existing housing is still in good condition, so only the wear components (O-ring, cover, and cup insert) need to be replaced.

Is the housing cover included in the 18-3494 kit reusable OEM equipment? The kit includes a new water pump housing cover, part 18-9083, which cross-references to Yamaha O.E. Number 63D-44312-00.

Will this kit work on any Yamaha outboard? The Sierra 18-3494 kit is specified to fit the Yamaha F70A (2010-17); it is not listed as fitting other Yamaha outboard models.

What is the cup insert (18-3449) used for in this kit? The cup insert, part 18-3449, is one of the components supplied in the Sierra 18-3494 water pump repair kit.