11991 Gasket | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta gasket 11991, a small sealing washer-type gasket used within the fuel system on a wide span of Volvo Penta marine and industrial engines. It seals the mating joint at fuel system connections so the assembly remains leak-free and air-tight, and it is intended to be renewed whenever the joint is disturbed. This part number supersedes the earlier references 20277 and 876216.

🚤 Compatibility

• Engine Family: AQ, AQD, MD, D, BB, THD, TD, TAMD, B, DH, TAD, THAMD, TMD, MB, KAD, KAMD
• HP Range: 13-190 HP
• Year Range: Approximately 1970s - 2010s

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 11991
• Supersedes earlier part numbers 20277 and 876216
• Associated with the Fuel System group through its superseded reference
• Fits D1, D2, D3, MD, AQ, BB, TD, TAMD, THD, TAD, DH and KAD/KAMD series engines
• Single-use sealing component to be replaced each time the joint is opened
• Engine type: Volvo Penta 1- to 6-cylinder marine diesel
• Quantity varies by assembly, most commonly one

🔌 Function

The gasket forms a static seal between two mating faces at a fuel system joint, preventing fuel leakage and stopping air being drawn into the system. It compresses on assembly to take up minor surface irregularities and maintain a tight connection.

⚠️ Common Signs of Failure

• Fuel weeping, seepage or staining around the joint
• Hardened, flattened or cracked gasket material on inspection
• Air drawn into the fuel system causing hard starting, rough running or stalling
• Loss of sealing after the joint has been disturbed and the original gasket reused
• Visible fuel odour or residue in the engine bay near the connection

🛠️ Service Notes

• Fit a new gasket every time the joint is disturbed — a gasket takes a permanent set once it has been torqued and will not seal reliably a second time
• Scrape both faces back to clean bare metal, keeping the blade at a shallow angle so it lifts the old material without gouging the surface, and use a plastic scraper on aluminium castings
• Check the faces for flatness, cracks and corrosion pitting, and make sure no old gasket, carbon or hardened sealant is left in the corners or around the bolt holes
• Fit the gasket dry unless the workshop manual for your engine calls for a sealant, and then only the type it specifies — surplus sealant squeezes out into oil, coolant and fuel passages
• Draw the fasteners down progressively in the sequence and to the torque given in the manual for your engine, and recheck after the first heat cycle where the manual asks for it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 11991 → Supersedes 20277

OEM / Related Numbers

• 876216 earlier number superseded by this part
• 20277 earlier number superseded by this part
• 861841 referenced in the part notes
• 944988 related fuel-system washer

Aftermarket / Verified Equivalents

• Orbitrade: 22078 fuel-system gasket kit containing 11991
• Orbitrade: 22185 KAD300 fuel-system gasket kit containing 11991

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D2-40, D2-40B, D2-40F, 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 D3-130A-A, D3-160A-A, D3-190I-A, D3-110I-A, D3-130I-A, D3-160I-A
• Volvo Penta AQ130C, AQ130D, AQ130A, AQ130B
• Volvo Penta DH10A, DH10A 285, DH10A 360, DH10A Rail
• 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
• Volvo Penta AQ170B, AQ170C, AQ170A
• Volvo Penta BB115A, BB115B, BB115C
• Volvo Penta BB170B, BB170C, BB170A
• Volvo Penta D70B, D70B K, D70B PP
• Volvo Penta MB20A, MB20B, MB20C
• Volvo Penta MD5A, MD5B, MD5C
• Volvo Penta THD102KB, THD102KD, THD102K-KB
• Volvo Penta AQ115A, AQ115B
• Volvo Penta AQ200C, AQ200B
• Volvo Penta AQ225B, AQ225C
• Volvo Penta AQD70B, AQD70BL
• Volvo Penta MD11C, MD11D
• Volvo Penta MD17C, MD17D
• Volvo Penta MD70B, MD70BK
• Volvo Penta 100S, 110S
• Volvo Penta TAD940GE, TAD940VE
• Volvo Penta TAD941VE, TAD941GE
• Volvo Penta AQ165A
• Volvo Penta AQD2B
• Volvo Penta AQD21A
• Volvo Penta B20
• Volvo Penta BB165A
• Volvo Penta KAD300-A
• Volvo Penta KAMD300-A
• Volvo Penta MD1B
• Volvo Penta MD2B
• Volvo Penta MD21A
• Volvo Penta MD3B
• Volvo Penta TAD942VE
• Volvo Penta TAD943VE
• Volvo Penta TAD950VE
• Volvo Penta TAD951VE
• Volvo Penta TAD952VE
• Volvo Penta TAMD70B
• Volvo Penta TD70B
• Volvo Penta THAMD70B
• Volvo Penta TMD70B