8M0149929 Maintenance Kit for Mercury Quicksilver V6 3.4L V8 4.6L | JLM Marine

8M0149929 Maintenance Kit for Mercury Quicksilver V6 3.4L V8 4.6L | JLM Marine

This comprehensive maintenance kit is engineered for Mercury Quicksilver V6 (3.4L) and V8 (4.6L) outboard motors rated from 175 HP through 300 HP. Designed for the 100-hour engine maintenance interval, this kit delivers essential filtration and sealing components to keep your outboard running at peak performance.

Direct replacement for Mercury OEM part number 8M0149929, this kit provides a complete service solution in one package, streamlining your scheduled maintenance routine.

• Includes premium oil filter, low-pressure fuel filter, and gear case drain seals
• Fits Mercury Quicksilver outboards 175–300 HP (V6 3.4L & V8 4.6L engines)
• Complete 100-hour maintenance interval service kit

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.

Technical Specifications

Package Contents

This maintenance kit includes the following components:

• 1× Oil Filter (35-8M0123025)
• 1× Fuel Filter, Low Pressure (35-8M0106635)
• 6× Gear Case Drain Seals

Installation Guide

1. Ensure the engine is off and cool before beginning any maintenance work. Gather all necessary tools and have a drain pan ready.
2. Locate the oil filter housing on your Mercury V6 or V8 outboard engine. Use an appropriate filter wrench to remove the old oil filter.
3. Apply a thin film of clean engine oil to the gasket of the new oil filter (35-8M0123025). Install the new filter and tighten by hand until snug, then turn an additional 3/4 turn.
4. Locate the low-pressure fuel filter assembly. Relieve fuel system pressure and disconnect fuel lines, capturing any residual fuel in your drain pan.
5. Remove the old fuel filter and install the new low-pressure fuel filter (35-8M0106635), ensuring the flow direction arrow matches the fuel flow direction. Reconnect fuel lines securely.
6. Inspect the gear case drain and fill plugs. Remove both plugs and allow old gear oil to drain completely into your drain pan.
7. Remove the old drain seal from the drain plug. Install a new gear case drain seal from the kit, ensuring it seats properly in the plug groove.
8. Reinstall the drain plug with new seal and torque to manufacturer specifications. Fill the gear case with fresh gear lubricant from the bottom (drain hole) until oil appears at the top (vent/fill hole).
9. Install a new seal on the vent/fill plug and reinstall, torquing to specification. Wipe away any excess lubricant.
10. Start the engine and check for leaks around the oil filter, fuel filter, and gear case plugs. Allow the engine to reach operating temperature.
11. Shut down the engine and recheck the oil level. Top off if necessary and inspect all service points once more for leaks.
12. Record the maintenance date, engine hours, and service performed in your engine logbook for future reference.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Mercury outboard?
A: Verify that your engine is a Mercury Quicksilver V6 (3.4L) or V8 (4.6L) model rated between 175 HP and 300 HP. Cross-reference your current maintenance kit part number with 8M0149929. You can also use the Mercury Serial Number Guide and Parts Catalog linked above to confirm compatibility based on your engine's serial number.

Q: How often should I perform this maintenance service?
A: Mercury recommends this maintenance kit be used every 100 hours of operation or annually, whichever comes first. Regular servicing ensures optimal engine performance, fuel efficiency, and longevity. Always consult your owner's manual for specific maintenance intervals based on operating conditions.

Q: Can I reuse the old gear case drain seals?
A: No, gear case drain seals are single-use components. Reusing old seals can result in improper sealing, leading to gear oil leaks and potential lower unit damage. Always install fresh seals from the kit during each service interval.

Q: What are signs that my oil or fuel filter needs replacement?
A: Common indicators include reduced engine performance, hard starting, rough idling, decreased fuel efficiency, or visible contamination in old filters upon removal. Adhering to the 100-hour maintenance schedule prevents these issues before they affect engine operation.

Q: Is this an OEM or aftermarket kit?
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.