Sierra 18-7997 Marine Air Filter, Replaces Mercury Marine 35-853333T, Universal Fit for Mercury and Mariner Outboards

The Sierra 18-7997 is a replacement air filter engineered for Mercury and Mariner outboard motors. It is designed as a direct equivalent to Mercury Marine part number 35-853333T, giving outboard owners a reliable option when the factory filter needs replacing. The filter has a rectangular shape and a white finish, and installs in place of the original equipment filter using the existing mounting hardware and housing.

As part of Sierra's line of outboard replacement components, the 18-7997 is built to perform to the same fit and function standards as the original Mercury filter it replaces, helping maintain proper airflow to the engine's fuel and air intake system. It ships as a single unit and is backed by Sierra's manufacturer warranty.

This is a universal-fit filter intended for Mercury and Mariner outboard motor applications using the 35-853333T filter.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7997
• Product Type: Air Filter
• Fit Type: Universal Fit
• Shape: Rectangular
• Color: White
• Number of Items: 1
• Weight: 0.06 pounds
• UPC: 808282227227
• Category: Mercury Outboard Cooling System

Fitment

Mercury and Mariner outboard motors using filter part number 35-853333T (universal fit within this application).

Replaces (OEM)

• 35-853333T

Frequently Asked Questions

What does the Sierra 18-7997 air filter fit? The Sierra 18-7997 is designed for Mercury and Mariner outboard motors and is a universal fit within that application.

Is the Sierra 18-7997 the same as the Mercury 35-853333T filter? Yes, the Sierra 18-7997 is built as a replacement for Mercury Marine part number 35-853333T.

What color is the Sierra 18-7997 air filter? It is white and rectangular in shape.

How much does the Sierra 18-7997 air filter weigh? The Sierra 18-7997 air filter weighs 0.06 pounds.

How many filters come in one Sierra 18-7997 order? One Sierra 18-7997 air filter is included per order (Number of Items: 1).

Is the Sierra 18-7997 an OEM Mercury part or an aftermarket replacement? The 18-7997 is a Sierra-manufactured replacement part, not an OEM Mercury Marine part, though it is designed to replace Mercury Marine 35-853333T.

Does the Sierra 18-7997 come with a warranty? Yes, the Sierra 18-7997 is backed by Sierra's manufacturer limited warranty.

Will the Sierra 18-7997 work on both Mercury and Mariner outboards? Yes, the Sierra 18-7997 is listed as a universal fit for both Mercury and Mariner outboard motors.

What is the shape of the Sierra 18-7997 filter? The Sierra 18-7997 is rectangular in shape.

How do I install the Sierra 18-7997 air filter? The Sierra 18-7997 installs in the same location as the original Mercury 35-853333T filter it replaces, using the existing outboard housing and hardware.