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630393 – Continental Motors OEM Push Rod Assembly
Available now on the Airparts.aero Marketplace.
Overview
The Continental Motors 630393 is a genuine OEM, flight-critical push rod assembly for the valve train of Continental's renowned 470, 520, and 550 series large-displacement piston engines. This component performs two simultaneous and equally vital functions. First, as a structural link, it transmits the precise lifting motion from the camshaft and hydraulic lifter up to the rocker arm, which in turn opens the intake or exhaust valve. Second, its hollow construction serves as the primary conduit for delivering clean, pressurized engine oil from the lifter gallery to the rocker arm bushings, valve stems, and valve guides in the cylinder head.
This push rod is an assembly of a high-strength chromoly steel tube with precision-ground, case-hardened steel ball ends press-fit and brazed in place. It is engineered to act as a rigid column, resisting the compressive forces of the valve springs and the dynamic loads of high-RPM operation without bending or buckling. The integrity of the push rod is essential for correct valve timing, proper engine breathing, and the complete lubrication of the upper cylinder head—making it a non-negotiable component for engine reliability and safety.
Key Features
Genuine Continental Motors Part: A factory-new, OEM component, guaranteeing absolute conformity to the materials, heat treatment, dimensions, and quality standards of the original engine.
Dual-Function Design: Serves as both a structural compressive link for valve actuation and a hollow conduit for critical oil flow to the upper valve train.
High-Strength Chromoly Construction: The tube is fabricated from high-strength 4130 chromoly (chromium-molybdenum) steel for an exceptional strength-to-weight ratio and resistance to buckling.
Hardened Steel End Fittings: The ball ends are precision-formed from a case-hardened alloy steel to provide an ultra-durable, low-friction pivot point against the lifter and rocker arm.
Precision Manufactured: Engineered to an exact length and held to a tight straightness tolerance, which is critical for maintaining correct valve geometry and clearances.
Technical Specifications
Part Number: 630393
Component Type: Valve Train Push Rod Assembly
OEM Manufacturer: Continental Motors
Tube Material: 4130 Chromoly (Chromium-Molybdenum) Steel
End Fitting Material: Case-Hardened Alloy Steel
Design: Hollow tube for oil passage.
Aircraft Compatibility
The 630393 push rod is the specified assembly for a wide range of Continental's most successful large-displacement engines, including but not limited to:
Engine Models: O-470, IO-470, IO-520, TSIO-520, IO-550, TSIO-550, and their various sub-models.
Common Aircraft Applications: This encompasses a vast fleet of high-performance single and twin-engine aircraft, such as the Beechcraft Bonanza and Baron, Cessna 182/185/206/210/310/400-series, Mooney M20 series, and many others.
Note: This is a flight-critical engine component. The specific engine Illustrated Parts Catalog (IPC) for a given engine serial number is the final and absolute authority for determining part applicability.
Applications
Valve Actuation: Transmits the precise lift profile from the camshaft to the rocker arm to open and close the engine's intake and exhaust valves.
Upper-End Lubrication: Delivers the sole supply of pressurized oil from the main engine galleries up to the rocker arms, valve stems, valve guides, and valve springs.
Why Choose 630393?
The push rod is one of the most dynamically stressed components in a piston engine. A failure of a push rod—either by bending, buckling, or a tip failure—will cause an immediate and catastrophic engine failure as the valve train comes apart. Using a non-certified, "will-fit" part is an extreme risk. An inferior part may be made from the wrong material, have an improper heat treatment on the ends leading to rapid wear, or be of an incorrect length, which will disrupt valve timing and can cause piston-to-valve contact. The genuine Continental 630393 is the only part guaranteed to meet the stringent material, manufacturing, and quality control standards required to survive in this environment for a full TBO.
The engineering design of the 630393 push rod is a study in column mechanics. As a slender component loaded in compression, its primary potential failure mode is buckling. Its ability to resist this is defined by Euler's column formula,
Note: The 630393 is a flight-critical engine component. It must be installed by a certified A&P/IA mechanic, typically during a cylinder or engine overhaul. Before installation, each push rod must be inspected for straightness by rolling it on a perfectly flat surface (e.g., a surface plate) and its oil passage must be verified to be clear and unobstructed. Proper hydraulic lifter dry tappet clearance must be set upon assembly in strict accordance with the Continental Motors Overhaul Manual.
Documentation
No public-facing OEM documentation was located for this specific part number. All authoritative technical data, installation procedures, and inspection criteria are contained within the proprietary Continental Motors Standard Practice Maintenance and Overhaul Manuals for the 470, 520, and 550 series engines.
