Overview
The **Valve Stem Seal (Lycoming P/N 17F19357)** is a critical engine component engineered to regulate the amount of lubricating oil that enters the valve guide from the rocker arm area. Installed directly on the valve stem, typically at the top of the valve guide, this seal plays a vital role in preventing excessive oil consumption and reducing exhaust emissions by controlling oil flow into the combustion chamber. It is an integral part of the valve train system within Lycoming O-320 series engines, ensuring optimal lubrication of the valve stem while preventing oil from being drawn into the cylinder during intake strokes or pushed out during exhaust strokes.Specifications
- Part Number: 17F19357
- Manufacturer: Lycoming Engines
- Type: Valve Stem Seal
- Weight: 0.27 lb (approximately)
- Dimensions:
- Length: 3.25 inches
- Width: 1.15 inches
- Height: 0.85 inches
- Material: Typically a high-temperature resistant synthetic rubber or elastomer compound, often Viton or similar fluorocarbon material, designed for resilience against engine oils and operating temperatures.
- Color/Finish: Commonly black or brown, consistent with elastomer materials.
- Function: Prevents excessive oil passage down the valve guide into the combustion chamber.
Aircraft Compatibility
This Lycoming Valve Stem Seal, P/N 17F19357, is specifically designed for installation in various models of the Lycoming O-320 series aircraft engines. Its primary application includes:- Lycoming O-320-D3G engines
- Other Lycoming O-320 series engines, including but not limited to:
- O-320-A series
- Stock: Out of Stock - On Backorder
- Manufacturer Part #: 17F19357
- Part#: 17F19357
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.
