Water Pump O-Ring – Fits Yamaha Outboard 15HP-220HP (Replaces 93210-37M67, 18-7483, 84300)

Product Details

This Water Pump O-Ring is an aftermarket replacement designed for Yamaha outboard engines ranging from 15HP to 220HP, spanning model years from the mid-1980s through the early 1990s. It provides a precise seal for fuel system and water pump assemblies across a wide range of Yamaha outboards and WaveRunner models.

This O-ring directly replaces Yamaha OEM 93210-37M67, Sierra 18-7483, and GLM 84300.

• Constructed from durable rubber for wear-resistant, long-lasting sealing
• Direct drop-in replacement for factory O-rings
• Compatible with both outboard fuel systems and WaveRunner fuel tanks

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Material

Rubber

OEM Reference

93210-37M67

Sierra Reference

18-7483

GLM Reference

84300

Compatibility

Yamaha Outboard 15HP–220HP

What's in the Box

• 1× Water Pump O-Ring

Installation Notes

1. Disconnect the fuel line and relieve any residual pressure before beginning work.
2. Remove the lower unit or fuel system cover to access the O-ring location.
3. Carefully extract the old O-ring, noting its orientation and seating groove.
4. Clean the seating surface thoroughly to remove old lubricant, debris, or corrosion.
5. Lightly lubricate the new O-ring with marine grease or manufacturer-recommended lubricant.
6. Install the new O-ring by hand, ensuring it seats evenly without twisting or pinching.
7. Reassemble the lower unit or fuel system cover, torquing all fasteners to specification.
8. Reconnect the fuel line and inspect for leaks before returning the engine to service.

Troubleshooting & FAQ

How do I know if my O-ring needs replacement?

Look for visible cracking, hardening, flattening, or fuel/water seepage around the seal area. If you detect a fuel odor or notice dripping after shutdown, the O-ring is likely compromised.

Can I reuse the old O-ring during reassembly?

Reusing O-rings is not recommended. Even if they appear intact, compression set and micro-tears can cause leaks. Always install a fresh O-ring during service.

What lubricant should I use when installing?

Use a thin film of marine grease or the lubricant specified in your engine's service manual. Avoid petroleum-based products that may degrade rubber over time.

Will this O-ring fit my specific Yamaha model?

Cross-reference your engine model and year against the compatibility table above. If your engine uses OEM part 93210-37M67, this O-ring is a direct fit.

How often should I replace this O-ring?

Replace the O-ring whenever you service the water pump or fuel system, typically every 2–3 years or per your engine manufacturer's maintenance schedule.

What's the difference between OEM and aftermarket O-rings?

This listing is an aftermarket replacement, not OEM. Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Can I install this O-ring myself?

Yes, if you have basic mechanical experience and the proper tools. Follow your service manual's torque specifications and reassembly steps. If unsure, consult a qualified marine technician.

What are the shipping speed & cost?

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Is this O-ring covered by warranty?

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.