Lower Unit Seal Kit - Fits Volvo Penta DP-SM/DP-S/DP-S1 and OMC Sterndrive 4.3-8.2L V6/V8 (Replaces 3856002, 0769577)

Lower Unit Seal Kit – Fits Volvo Penta DP-SM/DP-S/DP-S1 and OMC Sterndrive 4.3-8.2L V6/V8

This lower unit seal kit provides the essential components for servicing sterndrive gearcases on select Volvo Penta and OMC models. It is designed to restore watertight integrity and prevent leaks in the lower gearcase unit.

This kit is a direct replacement for Volvo Penta part number 3856002 and OMC part numbers 3856002 / 0769577. It also replaces aftermarket parts Sierra RM3856002 and JLM Marine AM3856002.

• Compatible with Volvo Penta DP-SM, DP-S, and DP-S1 model stern drives.
• Fits 1996–1998 OMC sterndrive engines including 4.3L, 5.0L, 5.7L, 5.8L, 7.4L, and 8.2L V6/V8 models.
• Components are produced in an ISO9002 certified facility to meet or exceed OEM specifications.

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.

Volvo Penta

OMC

Technical Specifications

Package Contents

• 1 x Sealing Rings (851407)
• 1 x Sealing Rings (853807)
• 1 x Sealing Rings (853808)
• 1 x O-Rings (946438)
• 1 x O-Ring (955981)
• 1 x O-Ring (3852866)
• 1 x O-Ring (3852959)
• 1 x O-Ring (3854624)
• 1 x O-Rings (3854625)
• 1 x Water Tube Seal (3852315)
• 1 x Seal (3854595)

Explosion Diagram

Installation Guide

1. Drain the gearcase oil completely from the lower unit.
2. Carefully unbolt and remove the lower unit from the sterndrive assembly. Note all hardware positions.
3. Disassemble the necessary components (e.g., water pump housing, bearing carriers) to access the old seals.
4. Remove all old seals, gaskets, and O-rings. Thoroughly clean all mating surfaces, ensuring they are free of debris and old sealant.
5. Carefully install the new seals and O-rings from the kit. Ensure they are properly seated and lubricate them with marine grease where appropriate.
6. Reassemble all components in the reverse order of disassembly.
7. Reinstall the lower unit, making sure the driveshaft, shift shaft, and water tube are correctly aligned.
8. Torque all bolts to the manufacturer's specified values.
9. Refill the gearcase with the recommended type and amount of new gear lubricant.
10. Before operating, check for any signs of oil or water leaks.

Troubleshooting & FAQ

Q: How do I know if this seal kit fits my sterndrive?

A: This kit is designed for Volvo Penta DP-SM, DP-S, and DP-S1 models, as well as OMC sterndrives from 1996–1998 with 4.3L to 8.2L V6/V8 engines. Please cross-reference your original part number with the provided list (e.g., Volvo Penta 3856002, OMC 0769577) to ensure an exact match.

Q: What are the signs that my lower unit seals are failing?

A: Common signs of failing gearcase seals include milky or water-contaminated gear oil, visible oil leaks around the propeller shaft or lower unit housing, or a persistent loss of gearcase pressure.

Q: Does this kit contain everything for a standard lower unit service?

A: The package contains a comprehensive set of seals and O-rings for a typical lower unit reseal. Please review the detailed "Package Contents" list to confirm all parts you require are included for your specific job.

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.