Lower Unit Gasket Seal Kit – Fits Volvo Penta DP-S/DP-SM/DP-SMTD & OMC Sterndrive 4.3-8.2L (Replaces 3856002, 0769577)

Lower Unit Gasket Seal Kit – Fits Volvo Penta DP-S/DP-SM/DP-SMTD & OMC Sterndrive 4.3-8.2L

This lower unit gasket and seal kit is designed for specific Volvo Penta Duo-Prop sterndrives and OMC V6 & V8 Sterndrive engines manufactured between 1996 and 1998. It provides the necessary components to reseal the lower gearcase unit, preventing water intrusion and oil leaks.

This kit is a direct replacement for Volvo Penta part number 3856002 and OMC part numbers 3856002 and 0769577, ensuring compatibility with the specified models.

• Installation Type: Direct replacement for OEM components.
• Application: Designed for Volvo Penta dual-prop and OMC sterndrive lower units.
• Fuel Compatibility: Suitable for gasoline engines.

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 Applications

OMC Applications

Technical Specifications

Package Contents

• 2 x Sealing Rings (Replaces 851407, 18-0558)
• 2 x Sealing Rings (Replaces 853807, 18-2100)
• 2 x Sealing Rings (Replaces 853808)
• 2 x O-Rings (Replaces 946438)
• 1 x O-Ring (Replaces 955981)
• 1 x O-Ring (Replaces 3852866)
• 1 x O-Ring (Replaces 3852959)
• 1 x O-Ring (Replaces 3854624)
• 2 x O-Rings (Replaces 3854625)
• 1 x Water Tube Seal (Replaces 3852315, 18-32882)
• 1 x Seal (Replaces 3854595)

Installation Guide

1. Drain the gear lube completely from the lower unit by removing the drain and vent plugs.
2. Disconnect any external components, such as the speedometer tube or shift linkage.
3. Remove the bolts securing the lower unit to the upper sterndrive housing.
4. Carefully separate and lower the unit, watching for the driveshaft and water tube.
5. Systematically remove all old gaskets, seals, and O-rings that are being replaced by this kit.
6. Thoroughly clean all mating surfaces, ensuring they are free of old sealant, corrosion, and debris.
7. Apply a light coat of marine grease to the new seals and O-rings before installation.
8. Carefully press the new seals into place, ensuring they are seated squarely without damage.
9. Position the new gaskets on the cleaned surfaces.
10. Raise the lower unit, carefully aligning the driveshaft, shift shaft, and water tube.
11. Tighten the mounting bolts to the manufacturer's specified torque in the correct sequence.
12. Reconnect all external components and refill the gearcase with fresh, recommended gear lube.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific sterndrive model?

A: First, check the "Compatible Engine Models" section on this page. This kit fits Volvo Penta DP-S, DP-SM, and DP-SMTD drives from 1996-1998, and specific OMC V6 & V8 engines from the same period. The most reliable method is to cross-reference your original part number with those listed: Volvo Penta 3856002 or OMC 0769577.

Q: What are the signs that my lower unit gasket kit needs replacement?

A: The most common sign of a failed seal is finding water in your gear lube, which gives it a milky or cloudy appearance. Other symptoms include visible oil leaks from the lower unit housing or seeing cracks and deterioration on the old seals during a physical inspection.

Q: Is this kit suitable for a Bravo drive or is it only for Duo-Prop models?

A: This kit is specifically designed for Volvo Penta Duo-Prop applications (like the DP-S and DP-SM series) and OMC Sterndrive V6/V8 engines. It is not intended for use with MerCruiser Bravo or Alpha drives.

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 ISO9001-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.