Sierra 18-5874 Marine Stator, Mercury/Mariner 40 HP and 45 HP Jet Outboard Replacement

The Sierra 18-5874 is a replacement stator for Mercury and Mariner outboard motors, supplying the AC charge coil output that feeds the ignition and charging system. It is built with an aluminum construction and finished in white to match OEM appearance under the flywheel. This stator is designed as a direct fit for a specific set of Mercury/Mariner outboard applications identified by horsepower and engine serial number, so confirming your outboard's serial number against the fitment list below is the surest way to order the correct part. It is intended for gasoline-fueled, 4 stroke outboard engines using transom mounting, including outboards commonly used on inflatable boats. The stator functions as a wear-and-tear electrical component, and installing a correctly fitted replacement restores reliable spark and charging performance when the original unit fails or weakens with age. Because it is engineered to meet or exceed the performance of the original equipment part it replaces, it is a straightforward swap for the OEM stator on the applications listed, using the same mounting points and electrical connections as the components it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5874
• Weight: 3.83 pounds
• Material: Aluminum
• Color: White
• Engine Type: 4 Stroke
• Mounting Type: Transom Mount
• Fuel Type: Gasoline
• Maximum Horsepower: 50 Horsepower
• Recommended Uses For Product: For Inflatable Boats
• OEM Cross Reference: CDI 174-832075K1, Mallory 9-28810, Mercury 398-832075A20, 398-832075A14, 398-5454A25, 398-5454A21, 398-5919A6, 398-5919A8, 398-5919A2, 398-545A63, 398-818535A15

Fitment

• Mercury/Mariner 40 HP, 3 cylinder electric start (Belgium), engine serial number 9973100 and up
• Mercury/Mariner 40 HP, 4 cylinder electric start, engine serial number C159200 through D055047
• Mercury/Mariner 40 HP Jet, electric start, engine serial number T178500 and up
• Mercury/Mariner 45 HP Jet, electric models, engine serial number G590000 through T129554

Replaces (OEM)

• CDI 174-832075K1
• Mallory 9-28810
• Mercury 398-832075A20
• Mercury 398-832075A14
• Mercury 398-5454A25
• Mercury 398-5454A21
• Mercury 398-5919A6
• Mercury 398-5919A8
• Mercury 398-5919A2
• Mercury 398-545A63
• Mercury 398-818535A15

Frequently Asked Questions

What outboards does the Sierra 18-5874 stator fit? The Sierra 18-5874 stator fits Mercury/Mariner 40 HP 3 cylinder electric start outboards (Belgium-built, engine serial number 9973100 and up), 40 HP 4 cylinder electric start outboards (engine serial number C159200 through D055047), 40 HP Jet electric start outboards (engine serial number T178500 and up), and 45 HP Jet electric models (engine serial number G590000 through T129554).

How do I know if this stator is the right fit for my motor? Check your Mercury/Mariner outboard's engine serial number against the ranges listed for the 18-5874 stator, since fitment for this part is determined by horsepower, cylinder count, and specific serial number ranges rather than by model year alone.

What OEM part numbers does the Sierra 18-5874 stator cross-reference? The 18-5874 stator is interchangeable with CDI 174-832075K1, Mallory 9-28810, and Mercury numbers 398-832075A20, 398-832075A14, 398-5454A25, 398-5454A21, 398-5919A6, 398-5919A8, 398-5919A2, 398-545A63, and 398-818535A15.

What material is the Sierra 18-5874 stator made of? It is made of aluminum and finished in white to match the appearance of the original equipment stator on Mercury/Mariner outboards.

How much does the Sierra 18-5874 stator weigh? The Sierra 18-5874 stator weighs 3.83 pounds.

Is the Sierra 18-5874 a genuine Sierra part or an aftermarket copy? It is a genuine Sierra-manufactured replacement part, built to meet or exceed the performance of the original equipment component it replaces rather than being a generic aftermarket substitute.

What does a stator do on a Mercury outboard? A stator generates the AC current used by the ignition and charging system, and on the applications listed for the 18-5874, a failing stator is the typical reason for a replacement being needed.

What is included when I order the Sierra 18-5874? The order includes one Sierra 18-5874 stator unit for installation on the listed Mercury/Mariner outboard applications.

What fuel type and engine type is the Sierra 18-5874 stator designed for? The 18-5874 stator is designed for gasoline-fueled, 4 stroke outboard engines using transom mounting.

Can the Sierra 18-5874 stator be used on inflatable boat outboards? Yes, it is suited for outboards used on inflatable boats, in addition to the specific Mercury/Mariner horsepower and serial number applications it is built for.

Does the Sierra 18-5874 stator come with a warranty? Yes, the 18-5874 stator is backed by Sierra's standard limited warranty.