Volvo Penta Saildrive Propeller Shaft Sealing Ring 3593663
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Volvo Penta 3593663 is a saildrive propeller shaft sealing ring used behind the propeller to help protect the saildrive gearbox from water intrusion. Current Volvo Penta dealer references show 3593663 has been replaced by 24940252, the current sealing ring reference. This seal is commonly used in pairs at the propeller shaft seal location on supported Volvo Penta saildrive and reverse gear assemblies.
Key Features
- Volvo Penta saildrive propeller shaft sealing ring
- Current replacement reference: 24940252
- Previous Volvo Penta reference: 3593663
- Used behind the propeller to help protect the gearbox from water ingress
- Common service note: two sealing rings are required at the prop shaft seal location
- Common supplier weight reference: approximately 0.02–0.07 lb
- Also shown as diagram reference #16 in supported lower gear / saildrive parts groups
Engine Compatibility
This sealing ring is primarily saildrive / reverse gear specific, not engine-displacement specific. Current replacement reference 24940252 is listed for Volvo Penta saildrive and gear applications including 120S, 120S-B, 120S-D, 120S-E, 130S, 130S-B, 130S-C, 130S-D, 130SR, 130SR-A, 130SR-B, 130SR-C, 130SR-D, 150S, 150S-B, 150S-C, 150S-D, 150SR, 150SR-B, 150SR-C, 150SR-D, MS2B-A, MS25S-A, MS25SR, and MS25SR-A depending on serial number and assembly. It is also shown across engine families such as 2001, 2002, 2003, MD11, MD17, MD2010, MD2020, MD2030, MD2040, MD22, and TMD22 where the matching saildrive or gear assembly calls for this seal.
Serial Number Fitment Notice
Sealing ring fitment depends on the exact Volvo Penta saildrive, reverse gear, propeller shaft arrangement, lower gear assembly, and serial number range. Always confirm compatibility using the Volvo Penta engine or saildrive serial number and the current parts diagram before ordering, especially where older 3593663 has been replaced by 24940252.
When This Part Needs Replacement
Replace these sealing rings during propeller shaft seal service, when there is water contamination in the gear oil, visible seal damage, fishing-line damage at the prop shaft, oil leakage, hardened seal lips, or any sign that water may be entering the saildrive gearbox.
Installation Notes
Inspect the propeller shaft surface, seal bore, bearing housing, gear oil condition, and related O-rings while the assembly is apart. These seals are commonly installed as a pair, so confirm quantity before service. Press the seals in squarely and to the correct orientation for the specific saildrive or gear assembly, then pressure/vacuum test where required before returning the boat to service.
Alternate/Superseded Part Numbers
- 3593663
- Volvo Penta 3593663
- 24940252
- Volvo Penta 24940252
- 851979
- 873108
- REC3593663
Parts Desk Insight
This is one of those saildrive seals where quantity matters as much as the part number. The common setup uses two sealing rings behind the prop, so it is worth confirming the full seal stack before starting the job rather than replacing only one seal and reopening the lower gear later.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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