9-74002 Lower Unit Seal Kit for Honda BF35AM BF40A BF40AW BF40AX BF45AM BF50A BF50AW BF50AX | JLM Marine

Lower Unit Seal Kit for Honda BF35AM BF40A BF40AW BF40AX BF45AM BF50A BF50AW BF50AX

This Lower Unit Seal Kit is precision-engineered to fit Honda Marine outboard motors ranging from 35 HP to 50 HP, including the BF35AM, BF40A, BF40AW, BF40AX, BF45AM, BF50A, BF50AW, and BF50AX models. Designed to restore and maintain the integrity of your lower unit, this seal kit ensures proper lubrication retention and prevents water intrusion.

This kit directly replaces Honda Marine Part 14ZV50M, Mallory Part 9-74002, and Sierra Part 18-8362-1, offering a reliable aftermarket solution for lower unit maintenance and repair.

• Complete seal kit for comprehensive lower unit service
• Fits Honda Marine 35 HP - 50 HP outboard motors
• Ensures proper sealing to prevent gear oil leaks and water contamination

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 package includes the following components:

• 1 × Lower Unit Seal Kit

Installation Guide

1. Disconnect the battery and tilt the outboard motor to access the lower unit. Drain the gear oil completely and inspect for metal shavings or water contamination.
2. Remove the propeller, cotter pin, and propeller shaft hardware. Set aside all components in a clean workspace.
3. Detach the lower unit from the mid-section by removing the mounting bolts. Carefully lower the unit and disconnect the shift linkage.
4. Disassemble the lower unit housing to expose the propeller shaft, drive shaft, and water pump assembly. Take note of the orientation of all seals.
5. Remove all old seals, O-rings, and gaskets from the housing, shafts, and bearing carriers. Clean all surfaces thoroughly with solvent and a soft brush.
6. Inspect bearing surfaces and shaft splines for wear or damage. Replace bearings if necessary before installing new seals.
7. Lubricate each new seal with gear oil before installation. Carefully press seals into position using the appropriate seal driver to avoid damage.
8. Reassemble the lower unit components in reverse order, ensuring proper alignment of the drive shaft and shift linkage. Torque all fasteners to manufacturer specifications.
9. Reinstall the lower unit onto the mid-section, reconnecting the shift linkage and water tube. Secure with mounting bolts and torque to spec.
10. Refill the lower unit with the manufacturer-recommended gear oil through the fill hole until oil appears at the vent hole. Install both drain and vent plugs with new washers.
11. Reinstall the propeller shaft hardware and propeller, securing with the cotter pin. Rotate the propeller by hand to ensure smooth operation.
12. Reconnect the battery, lower the motor, and perform a water test to verify proper shifting, cooling, and seal integrity. Check for leaks after initial operation.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Honda outboard?
A: Verify your engine model number (stamped on the mounting bracket or swivel) matches one of the compatible models listed: BF35AM, BF40A, BF40AW, BF40AX, BF45AM, BF50A, BF50AW, or BF50AX. You can also cross-reference the OEM part number 14ZV50M with your service manual.

Q: How often should I replace the lower unit seals?
A: Replace seals whenever you perform lower unit service, experience gear oil leaks, or notice milky oil indicating water intrusion. Typically, seals are replaced during major lower unit rebuilds or every 3-5 years depending on usage and operating conditions.

Q: What are the signs that my lower unit seals are failing?
A: Common symptoms include gear oil leaking from the propeller shaft area, milky or contaminated gear oil during regular checks, difficulty shifting gears, or unusual noise from the lower unit. Inspect seals immediately if any of these signs appear.

Q: Can I install this seal kit without special tools?
A: While basic hand tools suffice for disassembly, proper seal installation requires seal drivers or appropriately sized sockets to avoid damaging the new seals. A service manual with torque specifications and alignment procedures is highly recommended for successful installation.

Q: Does this kit include all the seals needed for a complete lower unit rebuild?
A: This kit contains the essential seals for lower unit service. Verify the contents against your service manual's parts diagram to ensure all required seals for your specific rebuild are included, as some applications may require additional gaskets or O-rings sold separately.

Q: Is this an OEM part or 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.