OMC Propeller Prop Shaft Stringer 389718 0387818 4CYL

( Part Type: Propeller Prop Shaft ), ( Manufacturer Part Number: 387818 )

Review OMC Propeller Prop Shaft Assembly Stringer 4cyl fits COBRA 400 1978-90

The OMC 387818, 389718, and 0387818 propeller prop shaft stringer, also known as the Cobra model, is a crucial component for marine applications, specifically for 4-cylinder, 400 HP outboard engines manufactured between 1978 and 1990. This stringer is designed to provide the necessary support and rigidity to the propeller shaft, ensuring efficient power transmission from the engine to the propeller.

This prop shaft stringer is fabricated from high-strength, marine-grade materials to withstand the harsh conditions of the marine environment. Its robust design makes it capable of handling the heavy loads and torque generated by high-performance engines. The stringer is specifically engineered for the OMC 4-cylinder, 400 HP engines, ensuring a precise fit and reliable performance.

The Cobra stringer features an open, "Cobra head" design at the engine end, which provides excellent clearance for the engine's lower unit. This design also allows for easy access to the propeller and the lower unit for routine maintenance and inspections. The stringer's closed-end design at the propeller end ensures a secure connection to the propeller and prevents unwanted vibrations.

The OMC 387818, 389718, and 0387818 propeller prop shaft stringer is designed for easy installation, ensuring that boat owners can replace their worn-out or damaged stringers with minimal downtime. The stringer comes with all necessary hardware for installation, including bolts and nuts.

In summary, the OMC 387818, 389718, and 0387818 propeller prop shaft stringer is a vital component for marine applications, specifically for 4-cylinder, 400 HP outboard engines manufactured between 1978 and 1990. Its robust design, made from high-strength, marine-grade materials, ensures efficient power transmission and reliable performance. Its open "Cobra head" design at the engine end provides easy access to the lower unit for maintenance, while its closed-end design at the propeller end ensures a secure connection. The stringer is easy to install, making it an excellent choice for boat owners in need of a replacement.

The OMC 387818/389718/0387818 propeller prop shaft stringer for Cobra 4cyl 400 engines produced between 1978 and 1990 is a crucial component in maintaining the performance and efficiency of the engine. This part is responsible for providing structural support to the propeller shaft and transmitting power from the engine to the propeller.

1. Enhanced durability: The OMC stringer is made of high-quality materials, ensuring long-lasting performance and resistance to corrosion.

2. Improved engine efficiency: A worn-out or damaged stringer can lead to a loss of power and decreased fuel efficiency. Replacing it with a new OMC stringer can help restore the engine's optimal performance.

3. Safety: A faulty propeller shaft stringer can pose a serious safety risk, potentially leading to engine failure or even capsizing. By investing in a new OMC stringer, you can ensure the safety of your vessel and its occupants.

4. Peace of mind: Knowing that you have a new, high-quality OMC stringer installed can provide you with peace of mind, allowing you to enjoy your boating experience without worrying about potential engine issues.

1. Cost: Replacing a propeller shaft stringer can be an expensive investment, especially for older models.

2. Installation complexity: Installing a new stringer requires specialized knowledge and tools, making it a potentially challenging task for some boat owners.

3. Availability: Finding a genuine OMC stringer for older models can be a challenge, as they may no longer be in production.

In conclusion, while the cost and installation complexity of the OMC 387818/389718/0387818 propeller prop shaft stringer for Cobra 4cyl 400 engines produced between 1978 and 1990 may be a concern, the benefits of improved engine efficiency, enhanced durability, safety, and peace of mind make it a worthwhile investment. If you are unsure about the installation process, consider seeking the assistance of a professional mechanic to ensure a proper installation.

Recommendation: If you own a Cobra 4cyl 400 engine produced between 1978 and 1990 and suspect that your propeller shaft stringer may be worn out or damaged, consider investing in a new OMC 387818/389718/0387818 stringer to restore optimal engine performance, ensure safety, and enjoy peace of mind while boating.

Details:

OMC 387818 / 0387818 Lower Unit Gear case Propeller Shaft Found on Stringer 4cyl 400 Series Cobra 1978-1990. OMC 389718 0387818 Propeller Prop Shaft Assembly Stringer Cobra 4cyl 400 1978-90: Item Details. Could be used on Johnson Eventide V4 outboards 1979-1982 as well. The compatibility statements or suggestions in this listing is my best guess based on the quick research we did for item.

Overall Good Condition, please see the pictures for best idea of condition. Part Numbers Included. These are used parts. OMC 387818 / 0387818 Propeller Shaft Assembly Stamped 389718.

This is a later version of this part as the spline end for propeller continues full length shaft, but functionally equivalent to earlier types. Used parts may have cosmetic issues scratches, missing paint, faded plastic, pitting, rust, minor dents dings, etc. The condition of this item is as described in the and visible picture.

part #: 387818 prices

• $34.99-$55.00

specifications vesselveep:

• for models: 400, Cobra
• for makes: Omc
• for years: 1978-90
• part type: Propeller Prop Shaft
• manufacturer part number: 387818

payments vesselveep:

• credit card: Mastercard
• wallet: Google-pay
• other

seller vesselveep:

• rating: 100.0%
• city: Byron Center, Michigan
• # reviews: 5839

general vesselveep:

• condition: Used
• Parts Accessories > Boat Parts > Other

returns vesselveep:

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

offer vesselveep:

• sold: 0
• quantity: 1
• availability: In Stock
• started: May 13, 2026
• options: Ship-to-home

shipping vesselveep:

• transit: 2-6 Days
• carrier: USPS
• type: Fixed
• cost: $11.85
• class: Standard, Expedited
• service: USPS Ground Advantage, USPS Priority Mail

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