LYCOMING 742355 Idler Shaft P/n

( Brand: Lycoming ), ( Manufacturer Part Number: 742355 ), ( Part Type: Idler Shaft )

Review LYCOMING Idler Shaft P/n

The **Lycoming 742355 Idler Shaft** is a precision-engineered component designed exclusively for Lycoming aircraft engines, serving as a critical element in the valve train mechanism of models such as the O-320, O-360, and IO-540 series. Crafted from high-grade, heat-treated alloy steel, this idler shaft is forged to exacting tolerances to ensure durability, smooth operation, and long-term reliability under the demanding conditions of aviation applications. Its primary function is to maintain proper valve timing and clearance by transmitting motion between the camshaft and the rocker arms, thereby preventing excessive wear on the cam lobes and ensuring consistent engine performance. The shaft features a polished, hardened surface to minimize friction and reduce the risk of galling or seizing, while its machined splines or keyways are precision-ground to fit seamlessly with the engine s existing components, including the rocker arm studs and the camshaft drive. Engineered to withstand the high-stress environments of flight, this idler shaft is designed for easy installation, requiring only basic tools and a minimal amount of adjustment once positioned. Whether used in a rebuild, maintenance overhaul, or as a direct replacement for a worn or failed component, the **742355 Idler Shaft** exemplifies Lycoming s commitment to quality and performance, delivering the reliability aviators depend on for safe and efficient operation.

### **Pros and Cons of buying a Lycoming 742355 Idler Shaft (P/N)**

1. **Direct OEM Replacement** This part is a genuine Lycoming idler shaft, meaning it is designed to fit and function exactly as the original equipment manufacturer intended. This reduces the risk of compatibility issues with aftermarket alternatives.

2. **Reliability and Durability** Lycoming engines are known for their robust construction, and using an OEM part ensures that the idler shaft meets the same high standards in terms of material quality and machining precision. This can extend the life of the engine if installed correctly.

3. **Warranty Coverage** Purchasing from an authorized Lycoming dealer or distributor may include warranty protection, providing peace of mind in case of defects or premature failure.

4. **Easier Maintenance and Replacement** Since it is an original part, mechanics familiar with Lycoming engines will likely have experience working with it, simplifying installation and troubleshooting.

5. **Compatibility with Other Systems** The idler shaft is part of the valve train, and using an OEM part ensures proper alignment with the camshaft, rocker arms, and other components, reducing the risk of binding or improper valve timing.

6. **Resale Value Preservation** If you plan to sell or trade in the aircraft later, having OEM parts installed can make the aircraft more attractive to buyers who prefer complete, unmodified systems.

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1. **Higher Cost** OEM parts are typically more expensive than aftermarket alternatives. The Lycoming 742355 idler shaft may cost significantly more than a comparable aftermarket part, which could impact your budget.

2. **Longer Lead Times** Depending on the supplier, OEM parts may have longer lead times for delivery, especially if you need the part urgently. Aftermarket options often have faster availability.

3. **Limited Customization** Since it is an OEM part, you cannot modify its design or specifications to suit specific performance needs. If you require a non-standard configuration, you may need to explore aftermarket solutions.

4. **Potential Overkill for Minor Repairs** If the idler shaft is only slightly worn or damaged, an OEM replacement might be more than necessary. In some cases, a refurbished or reconditioned part could suffice at a lower cost.

5. **Depreciation Risk** Aircraft parts, even OEM, may depreciate over time, especially if the aircraft is not frequently flown. The value of the part may not recover if you decide to sell it separately.

6. **Installation Complexity** While OEM parts are reliable, improper installation can still lead to issues. If the mechanic lacks experience with Lycoming engines, there is a risk of mistakes during assembly, which could void warranties or cause further damage.

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The Lycoming 742355 idler shaft is a high-quality, reliable OEM part that ensures proper fitment and performance in a Lycoming-powered aircraft. It is the best choice if you prioritize durability, warranty coverage, and long-term reliability, even at a higher cost. However, if budget constraints or urgency are concerns, aftermarket or refurbished alternatives may be worth considering provided they meet the same quality and safety standards.

For most owners, the peace of mind and performance benefits of an OEM part justify the investment, especially in critical components like an idler shaft. If you are unsure, consult with a Lycoming-certified mechanic to confirm whether this is the best option for your specific engine and application.

- You need a guaranteed OEM replacement for optimal performance and reliability.

- You are willing to pay the premium for a part that matches the original specifications exactly.

- You plan to keep the aircraft long-term and want to preserve its value and integrity.

- You are on a tight budget and can find a high-quality aftermarket or refurbished part that meets Lycoming s specifications.

- You need the part urgently and can source it faster from another supplier.

- The damage is minor, and a less expensive solution (e.g., a reconditioned shaft) would suffice.

Ultimately, weigh the cost against the long-term benefits of using an OEM part, and ensure the supplier is reputable to avoid counterfeit or substandard items.

Details:

Lycoming Idler Shaft Part Number 742355.

part #: 742355 prices

• $30.00-$73.00

specifications engineaviatio:

• brand: Lycoming
• mpn: 742355
• part type: Idler Shaft

general engineaviatio:

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

payments engineaviatio:

• other
• wallet: Paypal
• credit card: Mastercard

shipping engineaviatio:

• class: Standard
• service: USPS Ground Advantage
• transit: 4-8 Days
• carrier: USPS
• cost: $8.10
• type: Calculated

offer engineaviatio:

• sold: 0
• quantity: 2
• options: Ship-to-home
• started: February 20, 2026
• availability: In Stock

seller engineaviatio:

• rating: 100.0%
• # reviews: 7981
• city: Cincinnati, Ohio

returns engineaviatio:

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

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