Overview
The Lycoming Cylinder Base Nut (P/N LW-13429) is a vital threaded fastener specifically engineered to secure the cylinder assembly to the crankcase studs on various Lycoming engines, most notably the TIGO-541 series. This robust nut plays a critical role in maintaining the structural integrity of the power section, ensuring proper compression sealing between the cylinder and crankcase, and effectively transmitting combustion forces. Its precise design is paramount for the reliable operation of the engine, preventing cylinder movement and maintaining the specified torque pre-load for the entire cylinder assembly.
Specifications
- Part Number: LW-13429
- Type: Cylinder Base Nut / Hold-Down Nut
- Material: High-strength alloy steel, typically heat-treated for durability.
- Finish: Cadmium plated for superior corrosion resistance and reduced thread galling.
- Thread Type: Precision-machined internal threads, commonly a fine-pitch UNF (Unified National Fine) series, designed for high clamping force and vibration resistance.
- Hex Size: Standard hex head for wrenching, typically 1/2 inch or 9/16 inch across flats, ensuring compatibility with common aviation tooling.
- Stock: Out of Stock - On Backorder
- Manufacturer Part #: LW-13429
- Part#: LW-13429
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.
