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. <
AI disclosure: this product description and its specifications were generated with AI assistance from the manufacturer's Illustrated Parts Catalog.
- Stock: Out of Stock
- 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 only to customer-remorse returns and customer-initiated cancellations. If a problem is our fault (our cancellation, unavailability, wrong item, confirmed defect, or shipping damage) your refund is 100% with no fees.
- Return shipping: paid by buyer on customer-remorse returns; we pay return shipping when the problem is our fault.
- 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
We source products from manufacturers, authorized distributors, and established aviation suppliers as applicable. We are an independent reseller; we do not claim direct dealer or authorized-representative status for any brand. Documentation, source, and warranty eligibility vary by product and are confirmed 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.
