Lycoming

Cylinder Deck Hex Nut 383-B

P/N 383-B

Condition disclosed

Condition as listed — Condition disclosed — is shown up front on this listing, along with the exact price, current availability, and what certification paperwork ships with the part, so you can confirm fit and airworthiness before you buy. Full specifications and answers to common questions are below.

Stocked & sold by AAP

$8.00

In stock

UOM EA · MOQ 1

Paperwork shown up front · 30-day returns · secure checkout

Request certification documents (8130-3 / EASA Form 1 / C of C)

Description

Overview

The Lycoming Oil Pump Drive Gear (P/N 383-B) is a fundamental component within the engine's intricate lubrication system. This gear is responsible for transmitting rotational power from the engine's crankshaft or an accessory drive shaft directly to the oil pump, ensuring continuous circulation of lubricating oil throughout the engine. Its proper function is absolutely critical for maintaining adequate oil pressure, cooling, and the overall longevity of the engine's internal moving parts. Without the reliable operation of the 383-B, the engine's vital lubrication circuit would fail, leading to severe damage.

Specifications

Detailed physical specifications for the Lycoming Oil Pump Drive Gear, part number 383-B, are primarily found within the comprehensive Lycoming engine overhaul manuals, as this component is integral to the engine assembly. Specific weight, precise dimensions, and material composition are typically not cataloged as standalone part specifications but are engineered to meet the exact requirements of the Lycoming O-320 and AEIO-320 series engines. Users should consult the relevant Lycoming overhaul and parts catalogs for engine-specific data regarding the 383-B.

Aircraft Compatibility

This Lycoming Oil Pump Drive Gear, P/N 383-B, is designed for a range of Lycoming direct-drive, air-cooled, horizontally opposed piston aircraft engines. Its application extends to several variants of the O-320 and AEIO-320 series, encompassing both carbureted and fuel-injected configurations.

Applicable Engine Models include:

Lycoming O-320-D3G (as specified in Parts Catalog PC-203-D3G)

AI disclosure: this product description and its specifications were generated with AI assistance from the manufacturer's Illustrated Parts Catalog.

Specifications

Part number	383-B
Manufacturer	Lycoming
Condition	—
Airworthiness	Condition disclosed
Country of origin	—
Lead time	days

Frequently asked

Does the Cylinder Deck Hex Nut 383-B include certification paperwork?

This item is supplied as "Condition disclosed" rather than with full 8130-3 traceability — normal for some condition codes, and it does not mean the part is unusable, only that the paperwork profile differs. Check the listing for exactly what documentation is included, and request any available records before you purchase if your installation requires them.

What condition is this part?

This part is listed in condition as listed — Condition disclosed. Condition codes describe how a part reached its current state (for example new, overhauled, serviceable, repaired, or as-removed) and directly affect what paperwork ships with it and how it should be installed. See the Glossary for the full definition of every condition code we use.

How fast does it ship?

This item is in stock and ships promptly, usually the same or next business day once your order and payment are confirmed. Exact transit time depends on your shipping method and destination and is shown at checkout. If your aircraft is grounded, AOG expedited handling is available on request — no phone tree required.

Can I return it?

You may return this item within 30 days of delivery if it is unopened, uninstalled, and in its original packaging. Items that have been installed, powered on, opened hazmat, or separated from an attached 8130-3 tag are non-returnable because their airworthiness status can no longer be confirmed once removed from the part. See our Returns policy for the full process.