Sierra Cover Assembly 18-4750, Replaces OMC 337778, Fits OMC Cobra & V6 Sterndrives 100-225 HP (1993)

The Sierra 18-4750 Cover Assembly is a direct-fit replacement cover for OMC Cobra and V6 sterndrive units, designed to restore proper protection and sealing to the drive assembly it mounts to. It is built to the same specification as the original equipment part it replaces, so it installs using the same mounting points and hardware locations as the OEM cover it is designed to replace. The cover measures 17 inches long by 8 inches wide by 2.75 inches high and is finished in white.

This cover is intended for OMC sterndrive powerheads rated 100, 120, 125, 140, 150, 175, 200, and 225 horsepower, specifically the OMC Cobra and V6 platform for the 1993 model year. Boat owners and marine technicians use this part to replace a cracked, corroded, or missing cover assembly during routine drive maintenance or after removing the original for service access. Because it carries the Sierra part number 18-4750 and cross-references directly to OMC 337778, it can be ordered with confidence that it matches the original part number stamped on the drive.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4750
• Replaces (OEM): 337778
• Fitment: OMC Cobra & V6, 100, 120, 125, 140, 150, 175, 200, 225 HP (1993)
• Color: White
• Dimensions: 17 x 8 x 2.75 inches
• Weight: 0.59 pounds

Fitment

• OMC Cobra & V6 sterndrives, 100, 120, 125, 140, 150, 175, 200, 225 HP (1993)

Replaces (OEM)

• 337778

Frequently Asked Questions

What does the Sierra 18-4750 Cover Assembly fit? It fits OMC Cobra and V6 sterndrives rated 100, 120, 125, 140, 150, 175, 200, and 225 horsepower for the 1993 model year.

Is Sierra 18-4750 the same as OMC part number 337778? Yes, the 18-4750 Cover Assembly is a direct replacement for OMC 337778 and cross-references to that number.

What color is this cover assembly? It is finished in white.

What are the dimensions of the 18-4750 cover? 17 inches long by 8 inches wide by 2.75 inches high.

How much does the 18-4750 Cover Assembly weigh? 0.59 pounds.

Will this cover fit any OMC sterndrive, or only specific horsepower ratings? It is designed specifically for OMC Cobra and V6 sterndrives in the 100 through 225 horsepower range for 1993, not for other OMC sterndrive lines.

Is the 18-4750 an OEM part or an aftermarket replacement? It is a Sierra-manufactured replacement built to match the fit and function of OMC 337778.

Does the 18-4750 cover include mounting hardware? The listing covers the cover assembly itself, part number 18-4750; no separate hardware kit is specified.

Can I use the 18-4750 Cover Assembly on a 1993 OMC Cobra 200 HP unit? Yes, the 200 HP rating is included in the fitment range for the 18-4750 on OMC Cobra & V6 sterndrives (1993).

What part number should I search for if I only know my old cover part is stamped 337778? Look for Sierra 18-4750, which replaces OMC 337778 directly.