35-805312 Air Filter Element for MerCruiser D2.8L D4.2L CMD D254 | JLM Marine

Air Filter Element – Fits MerCruiser D2.8L, D4.2L, CMD D254 Sterndrive & Inboard Engines

This air filter element is engineered to fit MerCruiser sterndrive and inboard engines, including the 2.8L Inline (D2.8L) and 4.2L (D4.2L, CMD D254) models. Designed for reliable filtration performance, this replacement ensures clean air intake for optimal engine combustion and longevity.

Direct Replacement for MerCruiser Part #35-805312 / 805312. This aftermarket air filter element provides dependable filtration for both sterndrive and inboard applications, helping protect your engine from contaminants.

• Compatible with MerCruiser 2.8L and 4.2L diesel engines
• Fits both sterndrive and inboard configurations
• Direct-fit replacement for OEM part number 35-805312

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

Your package includes:

• 1 × Air Filter Element

Installation Guide

1. Turn off the engine and allow it to cool completely before beginning work.
2. Locate the air filter housing on your MerCruiser engine (typically mounted near the intake manifold).
3. Remove the housing cover by loosening the retaining clamps or screws securing it in place.
4. Carefully lift out the old air filter element and inspect the housing for debris or contaminants.
5. Clean the inside of the air filter housing with a dry cloth to remove any dust or dirt buildup.
6. Position the new air filter element into the housing, ensuring it seats properly and aligns with the housing edges.
7. Reinstall the housing cover and secure it with the original clamps or screws, tightening evenly.
8. Double-check all connections and ensure the filter is seated correctly before starting the engine.
9. Start the engine and listen for any unusual sounds that might indicate improper installation.

Troubleshooting & FAQ

Q: How do I confirm this air filter fits my MerCruiser engine?
A: Check the compatible engine models table above and verify your engine is a 2.8L Inline (D2.8L) or 4.2L (D4.2L, CMD D254) sterndrive or inboard model. Cross-reference your current filter's part number (35-805312 or 805312) to ensure compatibility.

Q: How often should I replace my air filter element?
A: Air filter replacement intervals depend on operating conditions. For typical marine use, inspect the filter every 100 hours of operation or annually, and replace when visibly dirty or clogged. Engines operating in dusty or harsh environments may require more frequent replacement.

Q: What are the signs that my air filter needs replacement?
A: Common indicators include reduced engine performance, decreased fuel efficiency, black smoke from the exhaust, rough idling, or difficulty starting. A visual inspection showing dirt buildup or damage also signals it's time to replace the filter.

Q: Will this aftermarket filter perform like the OEM part?
A: Yes, this air filter is manufactured to meet or exceed OEM specifications using quality filtration media. It provides comparable filtration performance and durability to the original MerCruiser part at a more competitive price point.

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 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.