91251-ZY6-003 Honda Marine Water Seal 23x36mm | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Vertical Shaft Water Seal 23 × 36 × 8 mm - Part Number: 91251-ZY6-003

A genuine Honda 23 × 36 × 8 mm vertical-shaft water seal for the ZY6/ZVT inline-four gearcase family. It seals the driveshaft opening beneath the water pump and is commonly installed as part of a paired lower-unit sealing arrangement.

⚙️ Key Features

• Genuine Honda radial vertical-shaft seal
• Nominal dimensions: 23 × 36 × 8 mm
• Correct heavy-section sealing lip for the later inline-four gearcase
• Quantity and lip orientation must follow the model-specific service manual

🚤 Compatibility

Commonly used on

• Honda BF115D
• Honda BF115J
• Honda BF135A
• Honda BF135D
• Honda BF140A
• Honda BF150A
• Honda BF150D

Typically suits

• HP Range: 115-150 HP
• Engine Type: 2.4-litre inline four-cylinder EFI four-stroke outboard lower unit
• Year Range: Approximately 2004 onward, model dependent
• Serial / Identification Range: Confirm the complete frame serial, gearcase revision and 23 × 36 × 8 mm dimensions. Earlier gearcases can use the thinner 91251-ZW1-B04 seal.

🔌 Function

Prevents water entering the gearcase and gear lubricant escaping along the vertical driveshaft.

⚠️ Common Signs of Failure

• Milky gear lubricant
• Oil leakage beneath the water pump
• Seal lip is damaged, hardened or installed backwards
• Vertical shaft is pitted or grooved at the sealing surface

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 91251-ZY6-003 - current verified Honda service reference
• No later direct Honda supersession confirmed

OEM / Related Numbers

• 91251-ZY6-003
• 91251ZY6003

Aftermarket / Verified Equivalents

• No verified direct branded aftermarket equivalent

📦 Condition

• Genuine Honda Marine OEM part
• Brand new
• Supplied in genuine Honda or equivalent protective packaging