Bushings, packings and supports

Inboard Shaft Seals and Stern Glands: Reliability First

The shaft seal and stern gland (or stuffing box) are crucial components for the performance and safety of your inboard engine. A worn cutless bearing can generate excessive vibrations, abnormal noise, and, in the worst-case scenario, compromise shaft alignment, leading to more serious damage. The stern gland, on the other hand, is responsible for keeping water out of the hull, sealing the area around the propeller shaft. An inefficient stern gland can cause leaks and potential buoyancy problems.

Nautica Basile offers rubber cutless bearings and stern glands for inboard engines, suitable for various makes and models. Whether you are looking for specific packing material for your stuffing box or a replacement bearing, you will find the right component for your engine. We only offer high-quality spare parts, designed to withstand the stresses of the marine environment and ensure a long service life.

How to Choose the Right Packing Material for Your Stern Gland

The packing material is the fundamental sealing element within the stern gland (stuffing box). There are different types of packing, made with different materials such as graphite, Teflon, hemp, and synthetic materials. The choice of the most suitable marine packing depends on the type of stern gland, the shaft rotation speed, and the operating conditions. A quality packing ensures an effective seal, reduces friction, and prolongs the life of the shaft. Carefully consider the manufacturer's specifications before making your choice.

Useful Maintenance Tips

• Regular Inspection: Periodically check the condition of the bearings and stern gland for any signs of wear or damage.


• Preventive Replacement: Even in the absence of obvious problems, consider replacing the bearings and packing material every 2-3 years, or according to the engine manufacturer's recommendations.


• Adequate Lubrication: Some stern gland models require regular lubrication. Follow the manufacturer's instructions carefully to ensure optimal operation.


• Compatibility Check: Before purchasing any spare parts, always check compatibility with your engine model and the type of stern gland installed.

Are you also looking for inboard engine mounts? Visit our dedicated section to find the model that best suits your needs!

FAQ - Frequently Asked Questions

What is the main function of the shaft seal?

The shaft seal supports the propeller shaft inside the hull, reducing vibrations and ensuring correct alignment. A worn bearing can cause noise, vibration, and damage to the shaft.

How can I tell if my stern gland needs maintenance?

Signs of a stern gland that needs maintenance include excessive water leakage, overheating, and abnormal noises. Regular visual inspection can help identify any problems.

What are the most common materials used for packing material?

Stern gland packing is commonly made of graphite, Teflon, hemp, or synthetic materials. The choice of material depends on the type of stern gland, the shaft rotation speed, and the operating conditions.

How often should I check and/or replace the shaft seals?

It is recommended to visually inspect the cutless bearings at least once a year and replace them every 2-3 years, or according to the engine manufacturer's recommendations, even in the absence of obvious problems.

What happens if I ignore the signs of wear on the stern gland?

Ignoring the signs of wear on the stern gland can lead to water ingress into the hull, corrosion of the propeller shaft, and, in extreme cases, damage to the engine. Timely maintenance is essential to prevent more serious problems.

What is the main function of the shaft seal?

The shaft seal supports the propeller shaft inside the hull, reducing vibrations and ensuring correct alignment. A worn bearing can cause noise, vibration, and damage to the shaft.

How can I tell if my stern gland needs maintenance?

Signs of a stern gland that needs maintenance include excessive water leakage, overheating, and abnormal noises. Regular visual inspection can help identify any problems.

What are the most common materials used for packing material?

Stern gland packing is commonly made of graphite, Teflon, hemp, or synthetic materials. The choice of material depends on the type of stern gland, the shaft rotation speed, and the operating conditions.

How often should I check and/or replace the shaft seals?

It is recommended to visually inspect the cutless bearings at least once a year and replace them every 2-3 years, or according to the engine manufacturer's recommendations, even in the absence of obvious problems.

What happens if I ignore the signs of wear on the stern gland?

Ignoring the signs of wear on the stern gland can lead to water ingress into the hull, corrosion of the propeller shaft, and, in extreme cases, damage to the engine. Timely maintenance is essential to prevent more serious problems.