?unique=2f09a76)
J10778-16 – Lord Corporation Engine Shock Mount Kit
Available now through the AirParts Aero marketplace.
Overview Section
The Lord J10778-16 is a high-performance Engine Shock Mount Kit designed specifically for the vibration isolation of aircraft reciprocating engines. Lord Corporation is the industry leader in "Active and Passive Vibration Control," and the J10778 series is a foundational component for General Aviation aircraft powered by Lycoming and Continental engines.
The -16 kit includes the high-quality bonded rubber-to-metal sandwich mounts required to secure the engine to the airframe's dynafocal mount ring. These mounts are engineered to absorb the high-frequency vibrations produced by the combustion cycle and the mechanical rotation of the propeller, preventing harmonic resonance from transferring into the fuselage and cockpit.
Key Features Section
Superior Vibration Isolation: Engineered with a proprietary elastomer compound that effectively dampens engine-generated noise and airframe vibration, significantly reducing pilot fatigue.
Bonded Rubber-to-Metal Design: Features Lord’s signature bonding process, ensuring the rubber element stays permanently attached to the metal spacers and washers even under high torque.1
Dynafocal Alignment: Designed for "Type I" or "Type II" dynafocal mounts where the mount points are angled toward the engine's center of gravity for optimal stability.
Corrosion-Resistant Hardware: The metal components are plated to withstand the harsh environment of the engine compartment, including exposure to fuel, oil, and heat.
Service Life Longevity: Formulated to resist "set" or permanent deformation over time, ensuring the engine stays correctly aligned within the cowling.
Fail-Safe Architecture: The internal interlocking design ensures that even in the unlikely event of an elastomer failure, the engine remains mechanically attached to the airframe.
Technical Specifications Section
| Specification | Detail |
| Part Number | J10778-16 |
| Manufacturer | Lord Corporation |
| Component Type | Sandwich Style Vibration Isolator |
| Load Rating | Engineered for specific 4- and 6-cylinder engine weights |
| Installation Geometry | Dynafocal (Angled) |
| Material | Natural Rubber / High-Strength Alloy Steel |
| Set Contents | Typically includes 1 mount assembly (refer to IPC for quantities per engine) |
| Cross-Reference | Standard OEM replacement for various Lycoming and Continental mounts |
Aircraft Compatibility Section
The J10778-16 is a high-utilization part found in the maintenance logs of many popular airframes in the AirParts Aero inventory:
Cessna Series: Frequently used on the Cessna 182, 206, and 210 models.
Piper Aircraft: Common on the Piper PA-32 Saratoga and PA-28R Arrow configurations.
Beechcraft: Utilized on various Bonanza and Baron engine installations.
Mooney: Found on the M20 series high-performance singles.
Technical Applications & Safety
Engine mounts are "disposable" structural items. Over time, the rubber in the J10778-16 will lose its elasticity and begin to "sag." This causes the engine to sit lower in the cowling, which can lead to interference between the spinner and the nose bowl, or cause exhaust stacks to rub against the airframe.
Safety Warning: During Annual inspections, technicians must check for "sag" and rubber degradation (cracking or swelling due to oil exposure). If the engine can be moved excessively by hand, or if the rubber shows signs of "delamination" from the metal plates, the mounts must be replaced immediately to prevent structural damage to the mount ring.
Technical Engineering Insight
The engineering excellence of the Lord J10778-16 lies in its Hysteresis and Shear Spring Rate. Lord engineers the elastomer to have a specific damping ratio; it must be stiff enough to handle the 5-G loads of a hard landing while remaining soft enough to filter out the 2400 RPM vibration of the propeller.
The J10778-16 uses a Dual-Rate Elastomer. Under normal flight loads, it provides a "soft" spring rate for maximum comfort. Under high-torque scenarios (like takeoff), the mount becomes progressively stiffer to limit engine movement. Choosing genuine Lord mounts through AirParts Aero ensures your engine remains in the correct "thrust line," which is essential for maintaining the aircraft's trim characteristics and preventing unnecessary wear on control linkages and exhaust baffles.
Installation & Maintenance Addendum
Avoid Oil Contamination: Oil and fuel are the primary enemies of natural rubber. Ensure your engine has no active leaks that drip onto the J10778-16 mounts.
Torque Sequence: Always follow the airframe manufacturer’s specific torque sequence and values. Over-tightening can "crush" the internal spacers and ruin the damping effect.
Matched Sets: It is highly recommended to replace all engine mounts at the same time to ensure even weight distribution and consistent vibration damping.
