955991 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta o-ring listed for 124 applications across the AQD, TMD, AQ, AD, AQAD and D families. It carries no build note and no supersession history, so it is ordered by number against the assembly it seals.

🚤 Compatibility

• Engine Family: AQD, TMD, AQ, AD, AQAD, D, TSK, MD, TAMD, THAMD, B, BB, DP, SP, HS, DPX, KAD, KAMD

Full model list at the end of this description.

⚙️ Key Features

• 124 applications across six engine families
• No supersession history
• No build restriction listed
• Order by part number

🔌 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 seeping at the joint
• Ring flattened, hardened or shiny
• Nicks or splits from assembly damage
• 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

Aftermarket / Verified Equivalents

• SLP: OR-991

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 500A, 501A, 501B, 570A, 740A, 430A, 431A, 230A, 230B, 250A, 250B, 251A, 290A, 500B, 571A
• Volvo Penta TAMD31L, TAMD31L-A, TAMD31M, TAMD31M-A, TAMD31P, TAMD31P-A, TAMD31S, TAMD31B, TAMD31D, TAMD31P-B
• Volvo Penta DP-C, DP-C1, DP-D, DP-D1, DP-A, DP-A1, DP-B, DP-B1
• Volvo Penta TAMD41B, TAMD41H-A, TAMD41H-B, TAMD41M-A, TAMD41P-A, TAMD41P, TAMD41P-B, TAMD41A
• Volvo Penta AD31, AD31B, AD31D, AD31D-A, AD31L-A, AD31P-A, AD31XD
• Volvo Penta AD41P-B, AD41B, AD41L-A, AD41P-A, AD41, AD41A, AD41BJ
• Volvo Penta AQD70B, AQD70BL, AQD70CL, AQD70D, AQD70C
• Volvo Penta B230, B230E, B230F, B230FB, B230FX
• Volvo Penta SP-C, SP-C1, SP-A, SP-A1
• Volvo Penta TAMD70B, TAMD70E, TAMD70C, TAMD70D
• Volvo Penta AQ151A, AQ151B, AQ151C
• Volvo Penta D41, D41B, D41L-A
• Volvo Penta MD70B, MD70BK, MD70C
• Volvo Penta TMD31B, TMD31D, TMD31L-A
• Volvo Penta TMD41A, TMD41B, TMD41L-A
• Volvo Penta TSK DP-E, TSK DP-G, TSK DP-S
• Volvo Penta AQ131B, AQ131C
• Volvo Penta AQ171A, AQ171C
• Volvo Penta AQ200D, AQ200F
• Volvo Penta AQ225D, AQ225F
• Volvo Penta AQ271A, AQ271C
• Volvo Penta AQ311A, AQ311B
• Volvo Penta KAD42A, KAD42B
• Volvo Penta THAMD70C, THAMD70B
• Volvo Penta TMD70C, TMD70B
• Volvo Penta AQ145B
• Volvo Penta AQ175A
• Volvo Penta AQ205A
• Volvo Penta AQ211A
• Volvo Penta AQ231A
• Volvo Penta AQ260A
• Volvo Penta AQ290A
• Volvo Penta AQAD30A
• Volvo Penta AQAD40B
• Volvo Penta BB740A
• Volvo Penta DPX
• Volvo Penta HS1A
• Volvo Penta KAMD42B
• Volvo Penta MD31A
• Volvo Penta TAMD42B