861851 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta O-ring from the Lubricating and Oil System group, listed for 37 applications across the D and MD series. A second O-ring listed here, 861897, also covers 37 applications on the same engines but sits in the Engine group, so the system group is what separates the two.

🚤 Compatibility

• Engine Family: D, MD
• HP Range: 13-75 HP

Full model list at the end of this description.

⚙️ Key Features

• From the Lubricating and Oil System group
• 37 applications across D and MD engines
• O-ring 861897 is the Engine-group equivalent
• Quantity varies by assembly, most commonly two

🔌 Function

Squeezes into its groove to seal the joint against oil pressure, taking up the small movement between the parts.

⚠️ Common Signs of Failure

• Oil weeping from the joint
• Ring hardened, flattened or nipped when removed
• Ring found twisted or displaced from its groove
• Leak returning shortly after the joint is retightened

🛠️ Service Notes

• Neither this ring nor 861897 has a published weight, so order by the system group and part number
• Fit a new ring each time the joint is broken and lubricate it so it seats without twisting

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D2-55, D2-55B, D2-55C, D2-55D, D2-55E, D2-55F, D2-50F, D2-75, D2-75B, D2-75C, D2-75F, D2-60F
• Volvo Penta D1-30, D1-30B, D1-30F, D1-13, D1-13B, D1-13F, D1-20, D1-20B, D1-20F
• Volvo Penta MD2010, MD2010B, MD2010-C, MD2010-D
• Volvo Penta MD2020, MD2020B, MD2020-C, MD2020-D
• Volvo Penta MD2030, MD2030B, MD2030-C, MD2030-D
• Volvo Penta MD2040, MD2040B, MD2040-C, MD2040-D