Air Filter – Fits Mercury Mariner Outboard 2.5L DFI 115-225 HP (Replaces 35-853333T, 18-7997)

Air Filter – Fits Mercury Mariner Outboard 2.5L DFI 115-225 HP (Replaces 35-853333T, 18-7997)

This high-quality aftermarket air filter is designed to fit Mercury Mariner 2.5L DFI V6 OptiMax outboard engines, covering a range from 115 to 225 HP, primarily mid-2000s models. It serves as a direct replacement component, ensuring your engine receives clean air for optimal performance and longevity.

Engineered to meet or exceed OEM specifications, this air filter is a reliable alternative to original parts, protecting your engine's sensitive Direct Fuel Injection (DFI) system from harmful airborne contaminants.

• Installation Type: Simple drop-in replacement that fits directly into the factory air box.
• Engine Compatibility: Specifically designed for 2-stroke DFI outboard engines.
• Direct Replacement: Replaces multiple OEM and aftermarket part numbers for broad application.

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

Package contents may vary depending on the selected manufacturer option.

• Standard Package: 1 x Air Filter (Replaces 35-853333T)
• Race-Guy Package Includes: 1 x Air Filter, 1 x Key Chain
• XLJOY Package Includes: 2 x Air Filters (Replaces 35-853333T)

Explosion Diagram

Installation Guide

1. Safety First: Ensure the engine is completely turned off and has had time to cool down.
2. Locate Air Filter Housing: Find the air filter cover on the engine.
3. Remove Cover: Unfasten any clips or screws securing the housing cover and remove it.
4. Remove Old Filter: Take out the old air filter. Note its orientation for correct placement of the new one.
5. Clean Housing: Wipe away any dust or debris from inside the air filter housing.
6. Install New Filter: Insert the new air filter, making sure it sits securely and creates a proper seal.
7. Secure Cover: Re-attach the housing cover and fasten it tightly.

Troubleshooting & FAQ

How do I confirm this filter fits my specific engine?
Start by checking your existing part for a number and matching it to our cross-reference list (e.g., 35-853333T or Sierra 18-7997). Then, verify your engine model and HP rating against the "Compatible Engine Models" table. This filter is for Mercury 2.5L DFI OptiMax engines from 115-225 HP.

What are the signs that my air filter needs to be replaced?
A dirty or clogged air filter can cause reduced engine performance, poor acceleration, and increased fuel consumption. A visual inspection showing excessive dirt, moisture, or physical damage is a clear indicator for replacement.

How often should I replace the air filter?
Replacement frequency depends on your operating environment. For engines used in dusty or debris-heavy conditions, more frequent checks are needed. We recommend inspecting the air filter as part of your regular maintenance schedule and replacing it at least once per season or when it appears dirty.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.