955990 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta o-ring for MD series engines, listed for 5 applications. It supersedes 969152. Its fitment is much narrower than the other o-rings in this group, so it belongs to a specific assembly rather than being a general-purpose seal.

🚤 Compatibility

Typically suits:

• Volvo Penta MD3B
• Volvo Penta MD11C
• Volvo Penta MD11D
• Volvo Penta MD17C
• Volvo Penta MD17D

• Engine Family: MD

⚙️ Key Features

• For MD series engines
• Supersedes 969152
• 5 applications listed
• Assembly-specific rather than general purpose

🔌 Function

Seals the joint between two faces, squeezed into its groove to hold pressure and keep fluid where it belongs.

⚠️ Common Signs of Failure

• Weeping or dripping at the joint
• Ring hardened, flattened or gone shiny
• Nicks or splits from being pinched on assembly
• Swelling or softening from the wrong fluid

🛠️ Service Notes

• Always fit a new O-ring — never refit one that has been removed, as it has already taken a set in its groove
• Clean the groove and both sealing faces and check them for nicks, scoring and corrosion pitting; a damaged groove will leak however good the new seal is
• Smear the ring with a little clean lubricant compatible with the fluid it seals, then roll it into place by hand so it sits untwisted and fully in its groove
• Never lever an O-ring over a sharp edge or thread with a screwdriver; use a blunt plastic tool and protect any edge the ring has to pass
• Assemble the joint squarely and tighten to the figure and sequence given in the workshop manual for your engine — over-tightening extrudes the ring and causes the very leak you were curing

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 955990 → Supersedes 969152

OEM / Related Numbers

• 969152 earlier number superseded by this part

Aftermarket / Verified Equivalents

• SLP: OR-990

📦 Condition

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