3856002 Lower Unit Gearcase Seal Kit for Volvo Penta DP-S DP-S1 DP-SM DP-SMTD DP-SMTD1 | JLM Marine

Lower Unit Gearcase Seal Kit for Volvo Penta DP-S DP-S1 DP-SM DP-SMTD DP-SMTD1

This Gearcase O-ring Seal Kit is designed specifically for Volvo Penta stern drive models including DP-S, DP-S1, DP-SM, DP-SMTD, and DP-SMTD1. Engineered to provide reliable sealing for lower unit gearcase assemblies, this kit ensures optimal performance and protection against fluid leaks in demanding marine environments.

Direct Replacement for: Volvo Penta part number 3856002 and Johnson Evinrude part number 0769577. This aftermarket seal kit delivers comparable quality to OEM components at competitive pricing.

• Complete seal kit for Volvo Penta DP-series stern drives
• Ensures proper gearcase sealing and fluid retention
• Direct-fit replacement for multiple OEM part numbers

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.

Technical Specifications

Package Contents

This kit includes the following component:

• 1 × Gearcase Seal Kit

Installation Guide

1. Disconnect the stern drive from the engine and secure the unit in a stable work position. Ensure all power sources are disconnected before beginning.
2. Drain all gearcase oil completely and inspect for metal shavings or contamination. Clean the gearcase housing thoroughly.
3. Remove the old seals and O-rings from the gearcase, taking care not to damage sealing surfaces. Inspect all mating surfaces for scoring or damage.
4. Clean all sealing surfaces with a degreaser and wipe dry with a lint-free cloth. Ensure no debris or old seal material remains.
5. Lightly coat new seals and O-rings with marine-grade grease or gearcase oil before installation. This ensures proper seating and prevents pinching.
6. Install new seals and O-rings according to the manufacturer's assembly diagram, ensuring correct orientation. Press seals firmly into position.
7. Reassemble the gearcase components following factory torque specifications for all fasteners. Do not over-tighten.
8. Refill the gearcase with the correct type and quantity of lower unit oil as specified by Volvo Penta. Check for proper fluid level.
9. Inspect all seal areas for proper seating and signs of leakage before reinstalling the drive unit. Wipe clean and observe.
10. Reinstall the stern drive onto the engine following manufacturer procedures and torque specifications. Ensure all connections are secure.
11. Run the engine in a test tank or on the water and monitor for leaks around all seal areas. Check fluid levels after initial operation.
12. Perform a final inspection after the first few hours of use to confirm all seals are functioning properly. Top off gearcase oil if necessary.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Volvo Penta stern drive?
A: Verify your drive model matches one of the compatible models listed: DP-S, DP-S1, DP-SM, DP-SMTD, or DP-SMTD1. Cross-reference the OEM part number 3856002 with your service manual or parts diagram to ensure proper fitment before ordering.

Q: How often should I replace the gearcase seals?
A: Replace gearcase seals whenever you perform lower unit service, notice oil leaks, or experience water contamination in the gearcase oil. Most manufacturers recommend inspecting seals annually and replacing them every 2-3 years or during major lower unit overhauls.

Q: What are the signs that my gearcase seals are failing?
A: Common symptoms include visible oil leaks around the gearcase, milky or contaminated gearcase oil indicating water intrusion, difficulty shifting, or unusual noises from the lower unit. Inspect seals immediately if any of these issues occur.

Q: Can I reuse old seals during reassembly?
A: No, always replace seals with new components during gearcase service. Reusing old seals can result in improper sealing, oil leaks, and water contamination, leading to costly damage to internal gearcase components.

Q: What is the difference between this aftermarket kit and the OEM version?
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.