O-Ring Kit – Fits Volvo Penta SX/DPS Series Outdrives (Replaces 3855081, 3852045)

O-Ring Kit – Fits Volvo Penta SX/DPS Series Outdrives

This O-ring kit is a direct replacement for seals used in a wide range of Volvo Penta SX-M, SX-A, DPS-A, and DPS-B series inboard/outboard drives. It is designed to provide a reliable seal for the oil drainage, ventilation, and dipstick systems.

This kit directly replaces Volvo Penta part numbers 3855081 (for the vent/drain plugs) and 3852045 (for the dipstick). It is also a cross-reference for Sierra 18-7116, Sierra 18-7145, GLM 81100, Johnson/Evinrude 303067, 329381, 332584, and Mercury/Mariner 25-20633, 25-22174.

• Engineered for direct-fit installation.
• Provides essential seals for routine sterndrive maintenance.
• Kit includes o-rings for the dipstick, vent screw, and drain plug.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.

Volvo Penta Models

Mercury/OMC/Johnson/Evinrude Models

Technical Specifications

Package Contents

• 1 x Dipstick O-Ring (Replaces 3852045)
• 1 x Vent O-Ring (Replaces 3855081)
• 1 x Drain O-Ring (Replaces 3855081)

Installation Guide

1. Ensure the engine is turned off and the drive has had time to cool down.
2. Place an oil drain pan under the lower unit of the sterndrive.
3. Locate and remove the oil drain/fill plug, vent plug, and dipstick.
4. Carefully remove the old, worn o-rings from each plug and the dipstick. Be cautious not to scratch the sealing surfaces.
5. Clean the threads and sealing surfaces on the plugs and the sterndrive housing.
6. Lightly lubricate the new o-rings with fresh gear lube and install them onto the correct components.
7. Reinstall the plugs and dipstick, tightening them to the manufacturer's recommended torque specification. Do not overtighten.
8. Refill the sterndrive with the correct gear oil according to your owner's manual.
9. After a short period, check the plugs and dipstick for any signs of leakage.

Troubleshooting & FAQ

Q: How do I know if these O-rings will fit my outdrive?

A: This kit is specifically designed for Volvo Penta SX-M, SX-A, DPS-A, and DPS-B series drives. To ensure a correct fit, please review the "Compatible Engine Models" and "Part Number Cross-Reference" tables on this page. Matching your model and original part numbers (3855081, 3852045) is the best way to confirm compatibility.

Q: What are the signs that my old o-rings need replacing?

A: Common signs of failing o-rings include visible oil leaks around the drain plug, vent screw, or dipstick area. Upon inspection, old o-rings may appear brittle, cracked, flattened, or permanently compressed, which indicates they are no longer providing a proper seal.

Q: How often should I replace these o-rings?

A: It is best practice to replace the drain and vent plug o-rings every time you change your sterndrive's gear oil. This is typically done annually or after every 100 hours of operation, whichever comes first. The dipstick o-ring should be inspected regularly and replaced if it appears worn, damaged, or is not providing a tight seal.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.