Sierra 18-3348 Complete Water Pump Kit, Replaces OMC 984461, Fits All OMC Cobra Drives 2.3-7.5

The Sierra 18-3348 is a complete water pump kit built for All OMC Cobra Drives, covering displacements from 2.3 through 7.5. This kit is the full-service solution for restoring cooling system performance on OMC Cobra stern drives, supplying the components needed to rebuild the water pump section in one go rather than sourcing parts individually. It includes impeller 18-3058, the wear component most responsible for raw water circulation and the part most likely to fail first from dry-running or age-related cracking.

Because this is a complete kit rather than a housing-only kit, it is suited to a full water pump rebuild where the impeller is being replaced alongside the housing hardware, rather than a housing-only repair. It replaces OEM number 984461, giving owners of aging OMC Cobra drives a direct source for a part number that is no longer readily available from the original manufacturer.

Fitment spans multiple OMC Cobra Drive engine sizes and model years: 2.3 (1987-90), 2.5 (1986), 3.0 (1986-93), 4.3 (1986-93), 4.6 (1989), 5.0 (1986-93), 5.7 (1986-93), 5.8 (1989-93), and 7.5 (1987-89). Confirm your drive's engine size and model year against this list before ordering, since OMC Cobra water pump hardware varies by displacement and year.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3348
• Product Type: Complete Water Pump Kit
• Includes: Impeller 18-3058
• Weight: 0.79 pounds
• OEM Cross Reference: 984461
• UPC: 808282180416
• Fitment: All OMC Cobra Drives 2.3 (1987-90), 2.5 (1986), 3.0 (1986-93), 4.3 (1986-93), 4.6 (1989), 5.0 (1986-93), 5.7 (1986-93), 5.8 (1989-93), 7.5 (1987-89)

Fitment

• All OMC Cobra Drives 2.3 (1987-90)
• All OMC Cobra Drives 2.5 (1986)
• All OMC Cobra Drives 3.0 (1986-93)
• All OMC Cobra Drives 4.3 (1986-93)
• All OMC Cobra Drives 4.6 (1989)
• All OMC Cobra Drives 5.0 (1986-93)
• All OMC Cobra Drives 5.7 (1986-93)
• All OMC Cobra Drives 5.8 (1989-93)
• All OMC Cobra Drives 7.5 (1987-89)

Replaces (OEM)

• 984461

Frequently Asked Questions

What does the Sierra 18-3348 water pump kit include? This kit is a complete water pump rebuild kit for OMC Cobra Drives and includes impeller 18-3058 along with the housing hardware needed to rebuild the pump section.

Does the 18-3348 kit replace OMC part number 984461? Yes, Sierra 18-3348 directly replaces OMC 984461.

Which OMC Cobra Drive engines does 18-3348 fit? It fits All OMC Cobra Drives across displacements 2.3, 2.5, 3.0, 4.3, 4.6, 5.0, 5.7, 5.8, and 7.5.

What model years does the 18-3348 kit cover? Coverage varies by engine size: 2.3 (1987-90), 2.5 (1986), 3.0 (1986-93), 4.3 (1986-93), 4.6 (1989), 5.0 (1986-93), 5.7 (1986-93), 5.8 (1989-93), and 7.5 (1987-89), all for OMC Cobra Drives.

How much does the 18-3348 water pump kit weigh? The Sierra 18-3348 complete water pump kit weighs 0.79 pounds.

What is the difference between 18-3348 and 18-3349? 18-3348 is the complete water pump kit that includes impeller 18-3058, while the water pump housing kit is a separate part number covering the housing hardware without the impeller. Buyers doing a full rebuild need the complete kit; those only replacing housing components would need the housing-only kit.

Is impeller 18-3058 included in the 18-3348 kit? Yes, impeller 18-3058 is included as part of the Sierra 18-3348 complete water pump kit.

Is the Sierra 18-3348 an OEM or aftermarket part? Sierra 18-3348 is an aftermarket replacement kit manufactured to replace OMC part number 984461.

Will 18-3348 fit any OMC Cobra Drive regardless of engine size? It fits All OMC Cobra Drives, but only within the listed displacements and model years (2.3 through 7.5); confirm your specific engine size and year before ordering.

Does the 18-3348 kit come with a housing gasket or just the pump components? The 18-3348 is sold as a complete water pump kit for OMC Cobra Drives; it includes the impeller (18-3058) and the housing kit components needed for the rebuild.