851287 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta o-ring from the Marine Propulsion group, listed for 38 applications across the MD, AQ, BB, B, MB and AQD series.

🚤 Compatibility

• Engine Family: MD, AQ, BB, B, MB, AQD

Full model list at the end of this description.

⚙️ Key Features

• 38 applications across six engine series
• Marine Propulsion group seal

🔌 Function

Seals the joint by being squeezed into its groove, keeping oil in and water out of the housing.

⚠️ Common Signs of Failure

• Oil weeping or dripping from the joint
• Milky or emulsified oil where water has got in
• Oil level dropping between checks
• Ring found nipped, split or flattened on removal
• Ring hardened so it no longer springs back

🛠️ Service Notes

• Sliding sleeve 850303 shares the same 38 application listing, so this ring is often disturbed in the same strip-down
• Lubricate the ring lightly and make sure it is not trapped as the housing pulls up

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta AQ130C, AQ130D, AQ130A, AQ130B
• Volvo Penta AQ170B, AQ170C, AQ170A
• Volvo Penta BB115A, BB115B, BB115C
• Volvo Penta BB170B, BB170C, BB170A
• Volvo Penta MB20A, MB20B, MB20C
• Volvo Penta MD5A, MD5B, MD5C
• Volvo Penta AQ115A, AQ115B
• Volvo Penta AQD21A, AQD21B
• Volvo Penta MD11C, MD11D
• Volvo Penta MD17C, MD17D
• Volvo Penta MD21B, MD21A
• Volvo Penta MD6A, MD6B
• Volvo Penta MD7B, MD7A
• Volvo Penta AQ165A
• Volvo Penta B20
• Volvo Penta BB165A
• Volvo Penta MD67C
• Volvo Penta 110S