Volvo Penta - Shaft O-Ring - 3852565
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The Volvo Penta Shaft O-Ring 3852565 is an OEM-style sealing ring used on compatible Volvo Penta sterndrive shaft, U-joint, and bearing carrier assemblies. This O-ring helps seal the joint-shaft area to reduce the risk of water intrusion and lubricant leakage within the drive and transom assembly.
Key Features
- Genuine Volvo Penta shaft O-ring
- Part number: 3852565
- Fits compatible shaft, U-joint, and bearing carrier locations
- ID: 0.862" / 21.9 mm
- Thickness: 0.103" / 2.6 mm
- Designed for marine drive sealing applications
- Helps protect the drivetrain from water intrusion and seal failure
Drive Compatibility
Used on select Volvo Penta sterndrive applications, including SX, SX-M, DPS-A, DPS-B, DPS-B1, and Forward Drive configurations. Also cross-referenced with select OMC Cobra SX joint-era drive applications.
Fitment Notice
Verify fitment by drive serial number, transom shield/drive diagram, and original O-ring part number before ordering. O-rings can vary by shaft diameter, groove size, seal location, and drive generation.
When This Part Needs Replacement
Replace this O-ring if it is flattened, cracked, swollen, cut, hardened, missing, or disturbed during U-joint shaft, bearing carrier, or drive service.
Installation Notes
Clean the groove and mating surfaces before installation. Lightly lubricate the O-ring with the approved lubricant, seat it evenly without twisting, and inspect the shaft and carrier surfaces for corrosion, scoring, or pitting before reassembly.
Alternate/Superseded Part Numbers
Replaces or cross-references Volvo Penta 997368. Common related references include Mercury/MerCruiser 25-25439 and 25-20679, OMC 0911851, Chrysler/Force F53795-1, Sierra Marine 18-7153, and GLM Marine 81180.
Parts Desk Insight
O-rings are cheap, but they protect expensive drive components. If the drive is already apart, replacing the O-ring is usually smarter than reusing a flattened seal and risking water intrusion later.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.