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  3. SIERRA 815919A

SIERRA 815919A Alpha Shaft Lower Gearcase 1991-UP

fits model: Mercruiser.

815919a Sierra Mercruiser Alpha I Gen Ii Shift Shaft Lower Gearcase 1 1991-up

( Brand: Sierra ), ( Manufacturer Part Number: 815919A ), ( Part Type: Shaft ), ( Replaces: 18-2320, 21031, 9-72477 )

Review SIERRA Alpha Gen Shift Shaft Lower Gearcase 1991 Up fits MERCRUISER

The Sierra 815919A Mercruiser Alpha One-Piece Lower Gearcase is a crucial component of your MerCruiser outboard engine, designed for use on boats manufactured from 1991 and onwards. This lower gearcase is a key element of the Alpha One propulsion system, responsible for transmitting power from the engine to the propeller.

Measuring 13.5 inches long, 13.5 inches wide, and 16 inches high, this lower gearcase is meticulously crafted from high-strength materials to ensure durability and reliability. It features a one-piece design that eliminates the need for separate gearcase halves, resulting in improved sealing and reduced maintenance requirements.

The lower gearcase is equipped with a heavy-duty, precision-machined aluminum gearbox that delivers efficient power transfer. The gears are engineered to handle the rigors of continuous use in marine environments, ensuring optimal performance and longevity. The lower unit also includes a robust, corrosion-resistant fiberglass exterior that shields the internal components from the harsh effects of water, sunlight, and saltwater.

Additionally, this lower gearcase comes with a built-in oil cooler that maintains the optimal operating temperature of the gearcase oil, ensuring consistent performance and extended component life. The oil cooler is designed to be easily accessible for routine maintenance, allowing you to keep your engine running at its best.

The Sierra 815919A Mercruiser Alpha One-Piece Lower Gearcase is compatible with a wide range of MerCruiser outboard engines, including models with Alpha One, Bravo One, and Bravo Three drives. It is essential to note that the upper gearcase, drive shaft, and other related components will also need to be compatible with your specific engine configuration.

In conclusion, the Sierra 815919A Mercruiser Alpha One-Piece Lower Gearcase is an essential component of your MerCruiser outboard engine, designed to deliver reliable, efficient power transfer to the propeller. Its durable construction, precision machining, and corrosion-resistant design ensure optimal performance and extended component life, making it an excellent investment for boat owners seeking high-performance and dependable propulsion systems.

Buying a Sierra Mercruiser Alpha Gen Shaft Lower Gearcase for a Mercruiser outboard motor, specifically model 815919A, can be a significant investment for boat owners. Here are some pros and cons to consider before making a purchase.

Pros:

1. OEM Part: This lower gearcase is an original equipment manufacturer (OEM) part, ensuring a perfect fit and compatibility with your Mercruiser outboard motor.

2. Durability: The Sierra Mercruiser Alpha Gen Shaft Lower Gearcase is engineered to withstand the harsh marine environment, offering long-lasting performance.

3. Reliability: As a replacement part, it can help restore the performance and reliability of your outboard motor, allowing for a smoother and more efficient operation.

Cons:

1. Cost: The price of the Sierra Mercruiser Alpha Gen Shaft Lower Gearcase can be quite high, which may be a deterrent for some boat owners.

2. Availability: Depending on the location and availability, it may take some time to source and receive the part, potentially causing downtime for your boat.

3. Installation: Installing this lower gearcase requires specialized tools and knowledge, which may necessitate hiring a professional mechanic or service center.

In conclusion, the decision to buy the Sierra Mercruiser Alpha Gen Shaft Lower Gearcase 815919A depends on individual circumstances. If you prioritize OEM quality, durability, and reliability, and have the necessary budget, this part can be an excellent investment in maintaining the performance of your Mercruiser outboard motor. On the other hand, if cost is a significant concern, or if you're comfortable with aftermarket alternatives, you may want to explore other options. Ultimately, it's essential to weigh the pros and cons carefully before making a purchase.

Recommendation: If you decide to proceed with purchasing the Sierra Mercruiser Alpha Gen Shaft Lower Gearcase 815919A, ensure you obtain it from a reputable dealer or distributor to guarantee authenticity and quality. Additionally, consider having it installed by a professional mechanic or service center to ensure proper installation and avoid any potential complications.

Details:

Manufacturer PN: 815919A We answer questions quickly. Below the price of item. Alpha Gen II.

HAZARDOUS PRODUCTS HAZMAT: 1 Carriers charge extra to ship packages with products they consider hazardous, such as oils, paints, and primers. Condition: New. Mercruiser Alpha I Gen II Shift Shaft Lower Gearcase 815919A 1 1991 Up Sierra: Thumbnails to: PRODUCT SPECIFICATIONS: Brand: Sierra. Replaces: 18-2320, 21031, 9-72477.

part #: 815919a prices

  • $42.62-$75.49

specifications intengster:

  • for models: Mercruiser
  • brand: Sierra
  • mpn: 815919a
  • part type: Shaft
  • replaces: 18-2320, 21031, 9-72477

payments intengster:

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

offer intengster:

  • sold: 0
  • options: Ship-to-home
  • started: May 4, 2026
  • availability: In Stock
  • quantity: 2

shipping intengster:

  • service: USPS First Class, USPS Priority Mail, UPS Ground, USPS Priority Mail Express
  • cost: $8.13
  • transit: 4-11 Days
  • class: Standard, Expedited
  • carrier: USPS, UPS
  • type: Calculated

returns intengster:

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

general intengster:

  • Boat Parts > Sterndrive Motors Components > Internal Engine Parts
  • condition: New

seller intengster:

  • # reviews: 78330
  • city: Hollywood, Florida
  • rating: 99.5%
for models: mercruiser, part type: shaft, replaces: 18-2320, 21031, 9-72477,
category: boat parts > sterndrive components > internal engine parts, sku: 2410381997019603,
Sierra 815919A Is Similar To:
intengster logo
5 offers $42.62–$75.49 USD
  • New. Offer #1 priced at $75.49 + $12.00 shipping estimate = $87.49* total. +$12.00 shipping
  • New. Offer #2 priced at $43.87 + $5.78 shipping estimate = $49.65* total. +$5.78 shipping
  • New. Offer #3 priced at $42.62 + $5.78 shipping estimate = $48.40* total. +$5.78 shipping
  • Neu. Offer #4 priced at $43.93 + $6.40 shipping estimate = $50.33* total. II) 1991-1995 - 0D469859 THRU 0F679999 ALPHA ONE (GEN.II) 1996-1997 - 0F680000 THRU 0K999999 ALPHA ONE (GEN.II) 1998 AND UP - 0L100040 & Up PACKAGE 1 x Shift Shaft For MERCURY MERCRUISER Engine . Brand New Aftermarket Shift Shaft 1 SIMILAR ITEM NUMBER: Mercury No.: 8M0127949 Sierra No.: 18-2320 GLM No.: 21031 Mallory No.: 9-72477 Fits on: Mercury Mercruiser Alpha l Gen ll, Stern Drive ALPHA ONE (GEN.+$6.40 shipping
  • New. Offer #5 priced at $62.43 + $8.13 shipping estimate = $70.56* total. (3) Paint and chemicals. Shift Shaft Lower Gearcase.+$8.13 shipping

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