93210-86M38 Yamaha O-Ring | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Water Pump Housing O-Ring - Part Number: 93210-86M38

A genuine Yamaha large water-pump housing O-ring for selected 80HP to 250HP four-stroke and 100HP to 300HP two-stroke outboards.

The O-ring seals the pump housing or cartridge assembly to the lower-unit water-pump base, preventing cooling water from escaping around the housing.

⚙️ Key Features

• Genuine Yamaha OEM water-pump housing O-ring
• Correct Yamaha part number 93210-86M38
• Used on Yamaha large and V6 lower units
• Maintains cooling-water suction and discharge pressure

🚤 Compatibility

Commonly used on

• Yamaha V4 and V6 two-stroke water pumps
• Yamaha HPDI lower units
• Yamaha large four-stroke gearcases

Typically suits

• Engine models:
• Yamaha 100A
• Yamaha 115A, E115A, 115B and 115C
• Yamaha 130B
• Yamaha 140A and 140B
• Yamaha 150A, 150C, 150F and 150G
• Yamaha D150H
• Yamaha 175A, 175B, 175D and 175F
• Yamaha 200A, 200B, 200C, 200F and 200G
• Yamaha ProV 200
• Yamaha 220A
• Yamaha 225A, 225B, 225C, 225D, 225F and 225G
• Yamaha 250A, 250B and 250G
• Yamaha Z150, Z175, Z200, Z250 and Z300 HPDI
• Yamaha F80 through F250 four-stroke gearcases where specified
• HP Range: Approximately 80HP - 300HP
• Engine Type: Yamaha two-stroke, HPDI and four-stroke outboard
• Year Range: Approximately 1986 - 2019, dependent on water-pump housing

🔌 Function

The O-ring seals the pump housing against the lower water-pump base so the impeller can maintain cooling-water pressure.

⚠️ Common Signs of Failure

• Weak or intermittent tell-tale stream
• Water leaks around the pump housing
• Engine overheats after pump servicing
• O-ring becomes flattened, cut or twisted
• Pump housing will not seat evenly against the base

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 93210-86M38 current Yamaha OEM service reference

OEM / Related Numbers

• 93210-86M38
• 93210-86M38-00
• 9321086M3800
• 93210-37M67 related water-pump O-ring
• 61A-44311-series related water-pump housing
• 61A-W0078-series related water-pump kit

Aftermarket / Verified Equivalents

• Sierra: 18-7485
• Direct aftermarket water-pump housing O-ring: 93210-86M38

📦 Condition

• Genuine Yamaha part
• Brand new
• Supplied in original or equivalent packaging