Volvo Penta Bellows Kit 21132674

Volvo Penta Bellows Kit – Part Number 21132674

The Volvo Penta Bellows Kit (OEM Part No. 21132674) is a genuine OEM replacement bellows kit for Volvo Penta sterndrive systems. This kit seals and protects the drive shaft, U-joints, and gimbal assembly from water intrusion — one of the most critical maintenance items on any sterndrive-equipped vessel. A failed bellows is one of the leading causes of catastrophic sterndrive damage.

Part Details

• Part Number: 21132674
• Brand: Volvo Penta
• Official Product Type: Bellows Kit / Sterndrive Boot Kit
• MPN: 21132674
• System: Sterndrive / Transom Sealing System

Kit Contents

• Bellows / boot assembly
• Mounting clamps and hardware
• All components required for a complete bellows replacement

Compatible Applications

• Volvo Penta sterndrive systems – confirm fitment using your drive model, serial number, and the Volvo Penta parts diagram before ordering
• Designed for gimbal and transom assemblies on Volvo Penta sterndrives
• Protects drive shaft, U-joint, and CV joint areas from water intrusion
• Serial number requirements may apply — verify your drive model and serial number break to ensure this kit is correct for your application

System & Diagram Position

This bellows kit is part of the sterndrive transom sealing system. It appears in the Volvo Penta sterndrive and transom assembly diagram. Refer to your drive's parts diagram to confirm the correct diagram position and verify all bellows locations for your specific drive configuration.

Parts Desk Insights

Best use case: This kit is the correct replacement when your bellows show any cracking, tearing, softening, or collapse — or as a proactive replacement during annual drive service. Bellows should be inspected every season and replaced at the first sign of deterioration. This is one of the highest-value preventive maintenance items on a sterndrive boat: a $200 bellows kit can prevent a multi-thousand-dollar drive repair.

Common issues: Customers often discover a failed bellows only after water has already entered the drive housing, causing corrosion or U-joint damage. Bellows deteriorate from UV exposure, ozone, and heat cycling — even if the boat isn’t used heavily. Age is as much a factor as hours. If your bellows are more than 3–5 years old, replacement is strongly recommended regardless of appearance.

Service Interval

Inspect bellows at every annual haul-out or drive service. Volvo Penta recommends replacing bellows every 3 years or sooner if any cracking, softening, tearing, or deformation is present. Do not delay replacement — a failed bellows can sink a boat or destroy a drive in a single outing.

Technical FAQ

Q: How do I know if this is the right bellows kit for my drive?
A: Cross-reference your drive model, serial number, and the Volvo Penta parts diagram. Bellows configurations vary by drive type and model year, so serial number verification is essential.

Q: Is this a genuine OEM kit?
A: Yes. This is a genuine Volvo Penta OEM bellows kit, not an aftermarket substitute. OEM bellows are recommended to ensure proper fit, material quality, and service life.

Q: What happens if I don’t replace worn bellows?
A: A failed bellows allows water to enter the drive housing, leading to corrosion, U-joint failure, and potentially catastrophic drive damage. In severe cases, water can enter the bilge through the transom. Bellows replacement is one of the most important preventive maintenance tasks on a sterndrive boat.

Q: Can I inspect the bellows myself?
A: Yes. With the drive trimmed down, you can visually inspect the bellows for cracking, tearing, or collapse. Any deterioration warrants immediate replacement. A qualified marine technician should perform the replacement to ensure proper sealing and clamp torque.