21903975 Flange | Genuine Volvo Penta Part

🔧 Product Description

Machined connecting flange for the Volvo Penta pipe or housing assembly that specifies 21903975. Bolt pattern, pilot diameter and sealing face maintain alignment and contain the system pressure or exhaust flow.

🚤 Compatibility

Typically suits:

• Volvo Penta IPS15-C
• Volvo Penta D8A2-A MP
• Volvo Penta D8A4-A MP
• Volvo Penta IPS15-B
• Volvo Penta IPS15-A
• Volvo Penta D8A8-A MP

• Engine Family: IPS, D

⚙️ Key Features

• Machined sealing face and pilot register
• Factory bolt pattern and port diameter
• Maintains pipe/housing alignment
• Designed for the specified gasket or O-ring
• Suitable for the assigned pressure and temperature
• 2 used per assembly

🔌 Function

Joins and aligns two system components while providing the machined surface required for a pressure-tight seal.

⚠️ Common Signs of Failure

• Leakage or soot tracking at joint
• Warped or damaged sealing face
• Corroded bolt holes
• Misalignment stressing adjoining components

🛠️ Service Notes

• Clean both mating faces back to clean metal and check them for flatness and for burrs or old gasket left in the sealing area; a face pulled up around a stud hole will not seal however hard it is tightened
• Always fit a new gasket, seal or O-ring where the joint uses one, and only use a jointing compound if the workshop manual for your engine calls for one at that joint
• Draw the fasteners up evenly in stages, working across the flange rather than round it, and finish to the tightening sequence and figures given for your engine
• Inspect studs, nuts and threads while the joint is apart and renew anything corroded, stretched or seized — exhaust-side fasteners rarely come out twice
• Re-check the joint for leaks once the engine has been up to working temperature and cooled again

📦 Condition

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