Volvo Penta Shaft Seal Kit 3819725 – Fits 1.25" Shaft with 2.00" Stern Tube
Volvo Penta Shaft Seal Kit 3819725 – Fits 1.25" Shaft with 2.00" Stern Tube is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Volvo Penta Shaft Seal Kit 3819725 – Fits 1.25" Shaft with 2.0...
Product Details
This Volvo Penta Shaft Seal Kit 3819725 provides an effective watertight seal for inboard engines using a 1.25" (31.75mm) diameter propeller shaft with a 2.00" (50.8mm) stern tube outer diameter. The moulded rubber packing box is designed for reliable, low-maintenance operation.
It serves as a direct aftermarket replacement for Volvo Penta part numbers 3819725 and RM3819725.
- Features a compact design for simple, time-saving installation.
- Requires minimal maintenance—grease every 200 hours or once a year.
- Kit includes essential installation tools and grease for convenience.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3819725 |
| Volvo Penta | RM3819725 |
Engine & Model Compatibility
Confirm your component dimensions before ordering.
This seal kit is compatible with any Volvo Penta inboard engine setup that uses a 1.25" propeller shaft and a 2.00" stern tube. Compatibility is determined by these shaft and stern tube dimensions, not by a specific engine model.
Technical Specs
- Product Type
- Rubber Shaft Seal Kit
- Installation
- Mechanical compression fit
- Housing Material
- Rubber
- Housing Color
- Black
- Dimensions
- Shaft Diameter: 1.25" (31.75mm), Stern Tube Diameter: 2.00" (50.8mm), A: 36mm, B: 75mm (76mm)
- Weight
- 0.37kg (0.82 lb)
- Fitting Type
- Compression fit
- Maintenance
- Grease every 200 hours or once a year
What’s in the Box
- 1 x Shaft Seal Kit (3819725)
- 1 x Installation Tools (included)
- 1 x Grease (included)
Installation Notes
The moulded rubber packing box provides effective lubrication and sealing with a simple, time-saving installation process. For effective lubrication at all speeds, ensure the packing box bearings are water-lubricated. The maximum distance between bearing points must not exceed 1500mm (59"). Requires minimal maintenance—grease every 200 hours or once a year.
Troubleshooting & FAQ
How do I know if this shaft seal will fit my boat?
This seal is designed for a specific size combination: a 1.25" (31.75mm) diameter propeller shaft and a 2.00" (50.8mm) stern tube outer diameter. Compatibility depends on these precise measurements, not your engine model. Always measure your shaft and stern tube before ordering to ensure a correct fit.
What are the signs of a failing shaft seal?
Common signs include excessive water leakage into the bilge around the propeller shaft, visible cracks or perishing of the rubber housing, or unusual vibrations from the shaft area. Regular inspection as part of your maintenance routine is key to early detection.
How often does the seal need to be greased?
The seal requires periodic maintenance to ensure longevity and performance. It should be greased every 200 hours of operation or at least once a year, whichever comes first, using a suitable marine-grade grease as included in the kit.
Does this kit include everything needed for installation?
Yes, the kit is comprehensive and includes the shaft seal itself, a tube of grease, and the necessary installation tools to facilitate a straightforward replacement.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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