11997880 Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta screw (part number 11997880) for the MD22, TMD22 and TAMD22 series marine diesel engines. This is a small threaded fastener supplied as a single item, weighing approximately 0.014 kg. Using the correct original fastener helps maintain proper clamping force and assembly integrity during service work.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD22A
• Volvo Penta TMD22B
• Volvo Penta TMD22P-C
• Volvo Penta TAMD22P-B
• Volvo Penta MD22A
• Volvo Penta MD22L
• Volvo Penta MD22P

• Engine Family: TMD, TAMD, MD
• HP Range: Approximately 50-78 HP
• Year Range: Approximately 1990s

⚙️ Key Features

• OEM Volvo Penta part number 11997880
• Net weight approximately 0.014 kg (13.6 g)
• Sold as an individual screw
• Fits MD22, TMD22 and TAMD22 series marine diesel engines
• Genuine replacement fastener for original assembly fit
• Engine type: Volvo Penta / Perkins-derived 2.0L inline 4-cylinder marine diesel

🔌 Function

Secures and clamps a component to its mounting point on the engine, maintaining correct alignment and preload. Correct fastener specification is essential for reliable joint integrity under engine vibration and thermal cycling.

⚠️ Common Signs of Failure

• Corrosion or pitting of the head or threads from saltwater exposure
• Stripped, galled or cross-threaded threads preventing correct torque
• Loosening or backing out under vibration, causing a loose component
• Rounded or damaged drive head that cannot be engaged by a tool
• Stretched or snapped shank after over-torquing or seizure

🛠️ Service Notes

• Clean the threads in the casting and check them for damage before fitting; a screw run into a dirty or pulled thread gives a false torque reading and will not hold its load
• Tighten to the torque given in the workshop manual for your engine rather than by feel, and follow the specified sequence where the joint has one
• Use the thread locking or sealing compound the manual calls for at that joint — some screws pass into oil, coolant or fuel space and have to seal as well as clamp
• Renew any screw that is stretched, corroded in the shank, or has damaged threads or a rounded head, and never reuse one that was tightened by a stretch or angle-tighten procedure
• A little marine-grade anti-seize helps later removal where the manual permits it, but keep it off threads that are meant to take a locking compound

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 859774 earlier water pump
• 861578 replacement water pump
• 21282005 later water pump
• 859779 related pulley
• 945358 related flange screw
• 946329 related flange screw

📦 Condition

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