LYCOMING LW-15475 Flywheel Starter Ring Flywheel/

( Brand: Lycoming ), ( Manufacturer Part Number: LW-15475 ), ( Part Type: Ring Flywheel Starter )

Review LYCOMING Flywheel/ Starter Ring Support

The **Lycoming LW-15475 Flywheel/Starter Ring** is a precision-engineered, high-performance component designed exclusively for Lycoming aircraft engines, specifically tailored to the robust demands of aviation applications. This critical assembly combines the flywheel and starter ring into a single, integrated unit, ensuring seamless operation and optimal power transfer within the engine s crankshaft system. Crafted from high-grade, heat-treated steel, the flywheel is forged to exacting tolerances, delivering exceptional durability and resistance to wear, vibration, and thermal stress qualities essential for maintaining reliability in both general aviation and specialized flight operations. The starter ring, an integral part of this assembly, is meticulously machined to provide a precise interface with the engine s starter motor, facilitating smooth and efficient cranking during engine start-up while minimizing backlash and ensuring consistent torque delivery.

This component is engineered to meet or exceed the stringent specifications set by Lycoming, incorporating advanced manufacturing techniques such as CNC machining and dynamic balancing to eliminate any potential for imbalance or operational inefficiencies. The flywheel s robust design not only serves as a critical rotational mass to stabilize engine operation but also houses the magnetos, which are vital for generating the high-voltage ignition required to fire the engine s spark plugs. The starter ring, often overlooked but indispensable, ensures that the starter motor s engagement with the flywheel is both secure and repeatable, reducing the risk of premature wear on either component. Together, these elements form a harmonious unit that embodies the precision and reliability expected in aviation-grade power systems.

For aircraft owners, mechanics, and aviation enthusiasts, the **LW-15475 Flywheel/Starter Ring** represents a critical replacement part that upholds the integrity of the engine s mechanical systems. Whether installed in a classic piston-powered aircraft or a modern high-performance model, this component is designed to withstand the rigors of frequent use, varying altitudes, and environmental conditions, ensuring long-term performance without compromising safety. Its compatibility with Lycoming engines ranging from popular models like the O-320 to the more powerful IO-540 series makes it a versatile and indispensable part for maintaining the operational excellence of these engines. Proper installation, adherence to maintenance schedules, and the use of genuine Lycoming components like the LW-15475 are key to preserving the engine s efficiency, longevity, and the overall safety of the aircraft.

Buying a **Lycoming LW-15475 flywheel/starter ring gear assembly** (often referred to as a "starter ring gear" or "flywheel assembly") is a common repair for Lycoming engines, particularly in light aircraft. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying a New Flywheel/Starter Ring Gear Assembly**

1. **Reliability and Performance**

A new assembly ensures proper fit, alignment, and function, reducing the risk of mechanical failure. The starter ring gear must mesh correctly with the starter motor to engage the engine, and a worn or damaged unit can prevent reliable cranking.

2. **Prevents Engine Damage**

A failing starter ring gear can grind against the flywheel teeth, causing excessive wear or even damaging the flywheel itself. Replacing it proactively avoids costly repairs to the engine or starter system.

3. **OEM Quality (If Purchased from a Reputable Supplier)**

Many aftermarket suppliers offer high-quality replacements that meet or exceed OEM specifications. This ensures durability and compatibility with the engine s design.

4. **Simplified Installation**

Unlike rebuilding a flywheel (which requires machining and balancing), a new assembly is pre-machined, balanced, and ready to install. This reduces labor time and complexity for mechanics.

5. **Extended Engine Life**

A properly functioning starter ring gear reduces stress on the starter motor and ignition system, contributing to longer overall engine life.

6. **Warranty Coverage**

Reputable suppliers often provide warranties on their flywheel assemblies, offering peace of mind against defects.

7. **Compatibility with Modern Starter Motors**

Newer starter motors (especially those designed for modern aircraft engines) may require updated ring gear designs for optimal engagement. A new assembly ensures compatibility.

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### **Cons of Buying a New Flywheel/Starter Ring Gear Assembly**

1. **Cost**

A new flywheel/starter ring gear assembly typically ranges from **$500 to $1,200 **, depending on the supplier and whether it includes additional components (e.g., a new flywheel or starter motor). This can be a significant expense for aircraft owners, especially on older or less valuable aircraft.

2. **Labor Intensity**

- Removing the engine from the aircraft (or at least the cowling).

- Disconnecting the starter motor and related components.

- Aligning and securing the new assembly with proper torque settings.

- Reconnecting the starter, ignition, and electrical systems.

This is a **multi-hour labor job**, adding to the total cost.

3. **Potential for Misalignment or Installation Errors**

- Difficulty cranking the engine.

- Excessive wear on the starter motor.

- Vibration or noise during operation.

Proper alignment and torque specifications must be followed.

4. **Weight Considerations**

Some aftermarket assemblies may be slightly heavier than the original, which could affect the engine s balance or vibration characteristics. However, this is usually negligible unless the aircraft is highly tuned for performance.

5. **Limited Customization**

Unlike a custom-machined flywheel, a new assembly does not allow for modifications (e.g., adjusting tooth profile for better starter engagement). Most aftermarket units are designed to fit standard Lycoming engines.

6. **Supplier Quality Variability**

Not all suppliers are equal. Some may use lower-grade materials or poor manufacturing processes, leading to premature failure. It s critical to purchase from a **reputable, FAA-approved supplier** (e.g., Lycoming Parts, Aircraft Spruce, or specialized aviation suppliers).

7. **Starter Motor Compatibility Issues**

If the existing starter motor is old or damaged, replacing just the ring gear may not solve cranking problems. In some cases, a **new starter motor** is also required, adding to costs.

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### **Conclusion**

Buying a new **Lycoming LW-15475 flywheel/starter ring gear assembly** is generally the **best long-term solution** for most aircraft owners when this component fails or shows excessive wear. The benefits reliability, reduced risk of engine damage, and simplified installation outweigh the drawbacks for the average owner. However, the **cost and labor requirements** make it a significant investment, so it should be weighed against alternatives like rebuilding a flywheel (if feasible) or upgrading the starter motor system.

- **Severity of wear** (if the ring gear is severely damaged, replacement is necessary).

- **Starter motor condition** (if the starter is failing, it may be more cost-effective to replace both).

- **Supplier reputation** (always choose a trusted, FAA-approved source).

- **Labor availability** (ensure the mechanic has experience with Lycoming engines).

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### **Recommendation**

1. **If the ring gear is visibly worn, pitted, or cracked**, replace it with a **new OEM or high-quality aftermarket assembly** from a reputable supplier (e.g., **Lycoming Parts, Aircraft Spruce, or a specialized aviation parts dealer**).

- **Best choice:** A **complete flywheel/starter ring gear assembly** (e.g., **Lycoming Part # 15475-1 or equivalent**) to ensure proper fit and balance.

2. **If the starter motor is also failing**, consider replacing it at the same time to avoid future issues. Some mechanics recommend upgrading to a **modern starter motor** (e.g., **Bendix, Slick, or Continental**) for better reliability.

- **Rebuilding the flywheel** (if the ring gear can be machined back to spec).

- **Purchasing a used assembly** (from a trusted source) to reduce cost (though this carries higher risk).

- **Checking for FAA-approved used parts** (some suppliers offer inspected used assemblies at a discount).

4. **Always have the work performed by a certified Lycoming engine specialist** to ensure proper installation, alignment, and torque settings.

**Final Verdict:** For most cases, **replacing the flywheel/starter ring gear assembly is the safest and most reliable option**, provided the supplier and installer are trusted. The long-term benefits of avoiding engine damage and ensuring reliable starts justify the cost for the average aircraft owner.

Details:

No cracks,rings gear is good. This ring gear support is used and shows signs of wear. I would assume its for a place with ac. Its has 2 belt pulleys.

part #: lw15475 price

• $500.00

specifications engineaviatio:

• brand: Lycoming
• mpn: Lw-15475
• part type: Ring Flywheel Starter

offer engineaviatio:

• quantity: 1
• best offers: True
• options: Ship-to-home
• availability: In Stock
• started: April 15, 2026
• sold: 0

shipping engineaviatio:

• service: USPS Ground Advantage
• type: Calculated
• cost: $14.58
• class: Standard
• transit: 3-9 Days
• carrier: USPS

returns engineaviatio:

• policy: No Returns

seller engineaviatio:

• rating: 100.0%
• city: Lakeland, Florida
• # reviews: 640

payments engineaviatio:

• other
• credit card: Visa
• wallet: Paypal

general engineaviatio:

• Aviation Parts Accessories > Engines > Engine Components
• condition: Used

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