Overview
The **Lycoming Fuel Injector Nozzle Assembly (P/N 1853917)** is a precision component integral to the fuel injection system of Lycoming IO-720 series aircraft engines. This assembly is responsible for atomizing and directing the precisely metered fuel into the intake port of each cylinder, ensuring optimal fuel-air mixture distribution for efficient combustion. Its proper function is critical for engine power output, fuel economy, and smooth operation across all power settings, from idle to full throttle. This specific part, 1853917, plays a vital role in the engine's ability to achieve its rated performance and maintain consistent combustion, directly impacting flight safety and operational reliability.Specifications
While exact dimensions and material compositions can vary slightly between production batches or specific engine configurations, the Lycoming Fuel Injector Nozzle Assembly (P/N 1853917) typically exhibits the following characteristics:- Weight: Approximately 0.05 - 0.1 lbs (23 - 45 grams) per unit, designed for minimal contribution to engine weight.
- Overall Length: Typically 1.5 - 2.0 inches (38 - 51 mm), including the threaded portion and nozzle tip.
- Diameter (Body): Approximately 0.375 - 0.500 inches (9.5 - 12.7 mm).
- Material: Constructed from corrosion-resistant stainless steel and brass alloys for durability and resistance to fuel contaminants and high temperatures.
- Orifice Size: Precisely machined to specific flow rates, critical for engine calibration. This can vary by cylinder position or engine variant.
- Connection Type: Features a standardized AN-threaded fitting for connection to the fuel manifold lines.
- Finish: Natural metallic finish, free from coatings that could flake or contaminate the fuel system. <
- Stock: Out of Stock - On Backorder
- Manufacturer Part #: 1853917
- Part#: 1853917
Aircraft Fitment Finder
Returns & refund summary
- 30-day return window — with prior return authorization, unopened in original packaging.
- Restocking fee: 20% on unopened items, 30% on open-box items.
- Refund processing fee: 5.51% applies to all refunds (returns, cancellations, core-fee refunds) regardless of reason.
- Return shipping: paid by buyer.
- Non-returnable categories: installed/used parts, special-order or rebuilt items, programmed items (incl. ELTs), batteries, AOG-priority orders, international orders.
Full terms: Return Policy.
Authenticity & authorization
All parts sold by American Aviation Parts are genuine factory products sourced through authorized distribution channels. Our authorization status varies by brand — for some brands we are a direct authorized dealer; for others we are an independent reseller through authorized distribution. Either way, the part you receive is the same factory product, with standard documentation available on request.
See our full Manufacturer Authorizations page for the current per-brand status.
Need traceability paperwork?
If your installation requires FAA Form 8130-3, manufacturer Certificate of Conformance, or other traceability documentation, please call 1-877-722-8727 or email [email protected] before placing the order so we can confirm what is available for this part.
Shipping
Standard ground, expedited, and AOG shipping options are available at checkout. Full shipping-cost tiers and timelines are published on our Delivery Information page.
