Hydraulic Trim Oil Line – Fits OMC/Volvo Penta SX-M (Replaces 3857523)
Hydraulic Trim Oil Line – Fits OMC/Volvo Penta SX-M (Replaces 3857523) 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
Hydraulic Trim Oil Line – Fits OMC/Volvo Penta SX-M (Replaces 3857523)
Product Details
This aftermarket Hydraulic Trim Oil Line is a direct-fit replacement for OMC and Volvo Penta SX-M sterndrives from 1994 and newer. It is designed specifically for systems with a Port Down trim circuit and fore connections, connecting the trim cylinder to the manifold assembly.
It serves as a direct replacement for Volvo Penta part number 3857523 and OMC part number 3857523.
- Installation Position: Port Down with Fore Connections
- Connects: Trim Cylinder to Manifold Assembly
- Included: One complete oil line assembly
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3857523 |
| OMC | 3857523 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta Owners: Primarily fits SX-M models manufactured from 1994 onward that use a Port Down hydraulic circuit.
For OMC Owners: Fits SX-M sterndrive models from 1994 and newer equipped with a Port Down circuit and fore connections.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | SX-M | 4-Stroke | 1994–Up | 3857523 | Port Down with Fore Connections | |
| OMC | SX-M | 4-Stroke | 1994–Up | 3857523 | Port Down with Fore Connections |
Technical Specs
- Product Type
- Hydraulic Trim Oil Line
- Installation
- Port Down with Fore Connections
- Connection
- Trim Cylinder to Manifold Assembly
- Housing Material
- Metal
- Housing Color
- Silver and Black
- Fitting Type
- Standard Hydraulic Trim Fittings
- Recommended Fluid
- Compatible with Volvo Penta hydraulic trim fluid
- Warranty
- Varies by retailer (1-year typical for aftermarket)
What’s in the Box
- 1 x Oil Line (Replaces 3857523)
Installation Notes
- Ensure the engine is off and the drive is in the fully down position to minimize fluid loss.
- Place a drain pan under the hydraulic manifold and cylinder connections.
- Carefully disconnect the old hydraulic line fittings, preparing for some residual fluid spillage.
- Remove the old line completely from the vessel.
- Route the new oil line, ensuring it is clear of sharp edges, moving parts, or hot surfaces.
- Connect the new line to the trim cylinder and manifold assembly, tightening fittings to the manufacturer's recommended torque. Do not overtighten.
- Refill the hydraulic trim fluid reservoir to the correct level using the recommended fluid type.
- Cycle the trim system up and down several times to bleed any air from the system.
- Re-check the fluid level and top it off as needed. Carefully inspect all connections for leaks before operation.
Troubleshooting & FAQ
How do I identify if this is the correct line for my boat?
This line is specifically for the Port (left) side on a "Down" hydraulic circuit with fore connections on OMC and Volvo Penta SX-M drives (1994+). Always verify your existing system configuration and part numbers before ordering.
What are the signs of a failing hydraulic trim line?
Common signs include visible fluid leaks around the fittings or hose, a spongy or slow trim response, or the sterndrive failing to hold its position and "drifting" down over time.
Can I use regular automotive hydraulic fluid?
No. You must use a fluid specifically formulated for marine hydraulic trim systems to prevent seal damage and ensure proper operation in a marine environment. Check your owner's manual for the exact fluid specification.
Is this a high-pressure or low-pressure line?
This component is part of the high-pressure hydraulic circuit responsible for lifting and lowering the heavy sterndrive unit. Ensure all fittings are properly torqued to prevent dangerous leaks.
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.
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