MERCURY 392-2940 Nos Plate Commutator Assy. 45-90HP O/b

( Part Type: Plate ), ( Manufacturer Part Number: 392-2940 ), ( Country/region Of Manufacture: United States )

Review MERCURY Nos Plate Assy. Commutator 45-90hp O/b fits MERCRUISER 1967–1982

Introducing the Mercury 392-2940 NOS (New Old Stock) Plate Commutator, specifically designed for outboard Mercruiser engines with a power output ranging from 45 to 90 horsepower, and manufactured between the years 1967 and 1982. This essential component is crucial for the proper functioning of your Mercury outboard engine.

The Mercury 392-2940 NOS Plate Commutator is an electromechanical device that converts alternating current (AC) generated by the engine's stator into direct current (DC) required by the ignition system. The plate commutator consists of a series of insulated copper plates, arranged in a circular pattern, which are separated by insulating material. These plates are connected to the rotor, which rotates inside the commutator housing.

When the engine is running, the rotor, driven by the crankshaft, rotates inside the commutator housing. As the rotor rotates, it makes contact with the stationary plates, creating sparks that ignite the fuel-air mixture in the engine's cylinders. The precise timing and duration of these sparks are crucial for efficient combustion and optimal engine performance.

This NOS Mercury 392-2940 Plate Commutator is in new, unopened condition and comes individually packaged. Each plate is meticulously engineered to provide excellent conductivity and wear resistance. The insulating material between the plates is designed to maintain a consistent gap and prevent short circuits. The overall construction is robust and reliable, ensuring that it can withstand the harsh marine environment.

Installing the Mercury 392-2940 NOS Plate Commutator is a straightforward process that can be done by a skilled mechanic or a knowledgeable do-it-yourselfer. The replacement process involves removing the old commutator, cleaning and inspecting the commutator housing, and carefully installing the new plate commutator. Proper installation is crucial for the longevity and effectiveness of the new component.

In summary, the Mercury 392-2940 NOS Plate Commutator is an essential replacement part for outboard Mercruiser engines with a power output ranging from 45 to 90 horsepower, manufactured between the years 1967 and 1982. This high-quality, new component is designed to provide excellent conductivity, wear resistance, and reliable performance, ensuring that your engine runs efficiently and effectively.

Mercury 392-2940 series commutator plates are used in the alternators of MerCruiser outboard motors, specifically those with an output power range of 45 to 90 horsepower and manufactured between 1967 and 1982. When considering the purchase of a new Mercury 392-2940 series commutator plate, there are several pros and cons to take into account.

1. Improved efficiency: A new Mercury 392-2940 series commutator plate can result in increased charging system efficiency, leading to better battery charging and longer engine life.

2. Reliability: A new commutator plate can help ensure the reliability of the charging system, reducing the likelihood of electrical issues and potential engine damage.

3. Cost-effective solution: Replacing a worn-out or faulty commutator plate with a new one is often a more cost-effective solution compared to purchasing an entirely new alternator.

1. Availability: Mercury 392-2940 series commutator plates may not be easily available from local marine parts suppliers, requiring you to order from an online retailer or through the Mercury dealer network.

2. Installation complexity: The installation process of a new commutator plate can be complex, especially if you are not experienced with electrical systems or outboard motor repairs.

3. Cost: The cost of a new Mercury 392-2940 series commutator plate can vary depending on the source and availability. Be sure to compare prices from multiple retailers and consider the shipping costs.

In conclusion, purchasing a new Mercury 392-2940 series commutator plate for your MerCruiser outboard motor can offer several benefits, including improved efficiency, reliability, and cost-effectiveness. However, it may come with challenges such as availability, installation complexity, and cost. If you are confident in your ability to install the part yourself or have access to a professional mechanic, and if you can find a reliable and affordable source for the part, then a new Mercury 392-2940 series commutator plate may be a worthwhile investment for your outboard motor.

Recommendation: Before purchasing a new Mercury 392-2940 series commutator plate, make sure to confirm that it is the correct part for your specific MerCruiser model and year by consulting your owner's manual or contacting a Mercury dealer or authorized service center. Always shop from a reputable supplier to ensure the authenticity and quality of the part. Additionally, consider the cost-effectiveness of the new part against the potential repair or replacement costs of the entire alternator. If you are unsure about the installation process, it may be best to have a professional mechanic handle the job for you.

part # 3922940 prices

• $29.40-$59.17

specifications dorycontrol:

• for models: Mercruiser
• for makes: Mercury
• for years: 1967-1982
• part type: Plate
• manufacturer part number: 392-2940
• country/region of manufacture: United States

returns dorycontrol:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

payments dorycontrol:

• credit card: Diners-club
• other
• wallet: Paypal

general dorycontrol:

• condition: New other see details
• Parts Accessories > Boat Parts > Controls Steering

offer dorycontrol:

• availability: In Stock
• sold: 0
• started: September 6, 2025
• options: Ship-to-home
• quantity: 1

shipping dorycontrol:

• service: USPS Ground Advantage, USPS Priority Mail
• class: Standard, Expedited
• type: Calculated
• cost: $0.00
• transit: 4-9 Days
• carrier: USPS

seller dorycontrol:

• rating: 99.9%
• # reviews: 1643

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