Air Filter – Fits Mercury/MerCruiser CMD 2.8L Marine Engines (Replaces 879172)

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Air Filter – Fits Mercury/MerCruiser CMD 2.8L Marine Engines (Replaces 879172) is backordered and will ship as soon as it is back in stock.

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Delivery and Shipping

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If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This is a direct replacement Air Filter for Mercury/MerCruiser CMD 2.8L marine diesel engines (170 HP & 200 HP, 4-Stroke). It is designed for full compatibility with the original turbocharger and air filter assemblies, ensuring proper fit and engine performance.

It directly replaces OEM part numbers Mercury 35-879172 and Mercury 879172.

Engineered for direct, hassle-free installation.
Designed for use in marine diesel engine environments.
Meets or exceeds OEM specifications for filtration and airflow.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Mercury	35-879172
Mercury	879172

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This air filter is specifically designed for the following MerCruiser CMD 2.8L series diesel engines.

Brand	Model	Rated HP	Stroke	OEM Part No.	Notes
MerCruiser	CMD 2.8 EI	170	4-Stroke	35-879172	Turbocharger and Air Filter Assembly
MerCruiser	CMD 2.8 EI	200	4-Stroke	35-879172	Turbocharger and Air Filter Assembly
MerCruiser	CMD 2.8 ES	170	4-Stroke	35-879172	Turbocharger and Air Filter Assembly
MerCruiser	CMD 2.8 ES	200	4-Stroke	35-879172	Turbocharger and Air Filter Assembly
MerCruiser	CUMMINS/MERCRUISER DIESEL	2.8L-200/170	4-Stroke	35-879172	Turbocharger and Air Filter Assembly

Technical Specs

Product Type: Air Filter
Installation: Direct replacement
Fuel Type: Diesel
Dimensions: Length: 164.3 mm, Width: 120.5 mm, Height: 162.7 mm
Weight: 0.603 kg (1.33 lb)

What’s in the Box

1 x AIR FILTER (35-879172)

Installation Notes

Ensure the engine is off and cool before starting.
Locate the air filter housing. It is typically a plastic or metal box connected to the engine's air intake.
Release the clips, clamps, or remove the screws securing the housing cover.
Remove the cover and take out the old air filter. Note its orientation.
Clean the inside of the housing with a cloth or vacuum to remove any dirt or debris.
Insert the new air filter, making sure it is seated correctly and facing the right direction.
Replace the housing cover and secure it firmly.

Troubleshooting & FAQ

How do I know if this air filter fits my engine?

This filter is specifically for Mercury/MerCruiser CMD 2.8L diesel engines. The best way to confirm fitment is to check the part number on your old filter. It should match 35-879172 or 879172. Also, verify your engine model is listed in the compatibility table.

What are the signs of a dirty or failing air filter?

Common signs include reduced engine power, increased black smoke from the exhaust, lower fuel efficiency, and the engine running rough. A visual inspection showing the filter is clogged with dirt is the most definitive sign.

How often should I replace the air filter on my marine diesel engine?

Replacement intervals can vary based on operating conditions (e.g., dusty or salty environments). As a general rule, inspect the filter annually and replace it if it appears dirty or clogged, or as recommended in your engine's service manual.

Can I clean and reuse this air filter?

This is a disposable filter and is not designed to be cleaned and reused. Attempting to clean it can damage the filter media, reducing its effectiveness and potentially allowing harmful contaminants into your engine.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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