Engine Room Parts
Gaskets, Seals & Bearings
OEM sealing components and bearing systems for marine engines and propulsion
Request QuoteCritical Sealing & Bearing Solutions
Gaskets, seals, and bearings prevent fluid leaks, contamination, and mechanical wear in marine engines. Mercer Yachting supplies O-rings, lip seals, mechanical seals, gasket sheets and complete service kits in materials including NBR, Viton, and PTFE. We also stock shaft bearings, packing glands, and cutless bearings for propulsion systems. Each component is OEM-specified and material-matched for superyachts, cruise ships, and commercial vessels.
What We Supply
O-Rings
NBR, Viton, EPDM, and specialty O-rings in multiple sizes for fuel, oil, and hydraulic systems
Lip Seals & Shaft Seals
Double-lip and rotary shaft seals for propeller shaft and pump applications
Mechanical Seals
Balanced mechanical seals for pump and compressor applications in bilge systems
Gasket Sheets & Kits
Compressed asbestos-free sheets, elastomer gaskets, and OEM service kits
Shaft Bearings
Deep-groove ball bearings, tapered roller bearings, and cylindrical roller bearings
Packing & Glands
Braided packing for propeller shaft sterntubes and rudder bearings
Cutless Bearings
Rubber and polymer cutless bearings for propeller shaft seawater lubrication
Bearing & Seal Kits
Complete OEM-matched kits for overhaul and scheduled maintenance
How to Specify
Provide These Details
- Gasket/seal material requirement (NBR, Viton, EPDM, PTFE, FKM)
- Dimensions (ID, OD, width for O-rings; bore, diameter for bearings)
- Operating temperature and chemical exposure
- Pressure rating and service fluid (fuel, oil, coolant, saltwater)
- OEM engine or component make/model
- Bearing type and load rating if applicable
Common RFQs We Handle
Viton O-Ring AS568 Size
High-temperature elastomer O-rings for fuel and engine applications
Mechanical Seal Pump Kit
Balanced seal assembly for bilge or cooling water pumps
Gasket Sheet Asbestos-Free
0.5mm and 1.0mm compressed gasket material for flange applications
Cutless Bearing Replacement
Propeller shaft cutless bearing in standard and oversized diameters
Shaft Seal Kit Engine
Complete seal kit for main engine crankshaft or auxiliary pump
Deep Groove Ball Bearing
Engine accessory drive bearing in stainless or sealed configuration
Packing Gland Rope
Braided cooling water pump or propeller shaft sternline packing
Lip Seal Double-Acting
Rotary shaft seal for pump impeller or compressor drive
O-Ring Assortment Kit
NBR and Viton O-rings in 50-80 popular sizes for emergency spares
Tapered Roller Bearing
Propeller shaft thrust bearing in bronze or steel cage
Gasket Assortment Pack
Compressed and rubber gaskets for pump, cooler, and valve flange service
FKM Perfluoroelastomer O-Ring
Specialty elastomer for extended temperature and chemical compatibility
Bearing Housing Seal Kit
Complete seal assembly for thrust bearing housing or line shaft
Fuel Pump Gasket Set
OEM gasket kit for fuel injection pump rebuild
Cylindrical Roller Bearing
Accessory drive or alternator bearing in sealed configuration
Frequently Asked Questions
What is the difference between NBR and Viton O-rings?
NBR (Nitrile) is suitable for fuel and mineral oil, with good resistance to petroleum. Viton (FKM) offers superior high-temperature performance and chemical resistance for extended temperature ranges. Choose NBR for standard fuel/oil; choose Viton for extreme temperature or aggressive fluids.
How do mechanical seals prevent leakage in bilge pumps?
Mechanical seals use two polished faces (stationary and rotating) that maintain close contact, preventing fluid bypass. Springs keep the faces pressed together, absorbing pump vibration. They're more reliable than packing for high-speed pumps.
What is a cutless bearing and why is it needed?
Cutless bearings are seawater-lubricated polymer sleeves that support the propeller shaft where it exits the hull. They replace grease-lubricated bearings, reducing friction and heat while accommodating shaft deflection in rough seas.
Can asbestos gaskets still be used on marine vessels?
Most modern marine regulations restrict asbestos gaskets. Asbestos-free compressed gaskets offer equivalent sealing performance without health risks. Always specify asbestos-free unless your OEM specifically requires a legacy asbestos product.
How often should O-rings be replaced?
O-rings degrade over time due to UV, ozone, heat, and fluid exposure. Replace as part of scheduled maintenance, every 2-5 years depending on service conditions. Always replace if you observe cracks, shrinkage, or hardening.
What is PTFE and when is it used?
PTFE (Polytetrafluoroethylene, or Teflon) is a slippery, chemically inert polymer used in seals exposed to aggressive fluids like fuel or cleaning chemicals. It's often combined with other elastomers as a backup ring in dynamic seals.
What is packing and how does it differ from mechanical seals?
Packing is braided fiber rope compressed in a gland, allowing slight weeping for cooling and lubrication. Mechanical seals are precision faces that prevent all leakage. Packing is traditional and simpler; seals are more reliable for high-speed or corrosive applications.
How do I choose the right bearing type for my shaft?
Consider the load type: radial loads use deep-groove ball bearings; thrust loads use tapered roller bearings; combined radial and thrust use cylindrical roller bearings. Marine applications often use sealed or bronze-cage bearings for corrosion resistance.
Delivery Footprint
Mercer Yachting delivers across the Mediterranean — Malta, Antibes, Palma de Mallorca, Barcelona, Genoa, Athens, Split — and worldwide via our global logistics network. Emergency parts dispatched same-day from our Malta hub.
Ready to Specify Sealing Components?
Our marine specialists can source OEM gaskets, seals, and bearings for any engine or pump system. Contact us with material requirements, dimensions, and application details for a rapid quote.