The Lycoming Rocker Arm Bushing (P/N 2-8-18) is an essential component situated within the valve train mechanism of various Lycoming O-320, IO-320, and LIO-320 series aircraft engines. This precisely machined cylindrical bearing provides a low-friction pivot point for the rocker arm on its shaft, facilitating the accurate transfer of motion from the pushrod to the valve stem. Its critical role ensures proper valve timing, minimal wear on associated components, and efficient engine operation.
Specifications
- Part Number: 2-8-18
- Material: Bronze Alloy, typically SAE 660 (CDA 932) or equivalent bearing bronze, chosen for its wear resistance and lubrication properties.
- Inner Diameter (ID): 0.6250 inches (5/8 inch) nominal, precision-honed for shaft fit.
- Outer Diameter (OD): 0.7500 inches nominal, designed for press-fit into the rocker arm bore.
- Length: 0.500 inches nominal.
- Weight: Approximately 0.02 lbs (9 grams) per unit.
- Finish: Machined and deburred, often with a light oil coating for corrosion protection and initial lubrication.
- Configuration: Solid sleeve bushing, typically without oil grooves, relying on splash lubrication and the inherent porosity of bronze.
Aircraft Compatibility
The Lycoming Rocker Arm Bushing, P/N 2-8-18, is designed for broad applicability across the Lycoming O-320, IO-320, and LIO-320 engine families. This component is a standard part of the valve train assembly for these four-cylinder, horizontally opposed engines, ensuring consistent performance across numerous aircraft types utilizing these powerplants.
Technical Detail
Specifically, this bushing is compatible with:
- Lycoming O-320 Series: All
- Stock: Out of Stock - On Backorder
- Manufacturer Part #: 2-8-18
- Part#: 2-8-18
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.
