Description
Technical Overview & Product Details
The push rod operates under high cyclic compressive loads. During each engine cycle, it is pushed upward by the camshaft/tappet assembly to actuate the rocker arm. This component must possess the perfect balance of longitudinal stiffness (to prevent buckling under load) and low mass (to minimize reciprocating inertia).
- Compatible Engine Type: Yanmar 6N18 (A)L-V series marine propulsion and auxiliary engines.
- Part Number / Designation: 146673-14400.
- Component Type: Valve Train Push Rod.
- Material: High-tensile, heat-treated alloy steel, precision-hardened at the contact ends.
- Application: Located between the valve tappet and the rocker arm.
Key Features & Performance
- High Column Strength: Specifically engineered to resist flexing and buckling under high-RPM operation, ensuring that valve timing remains precise and consistent.
- Precision-Hardened Ball Ends: The contact surfaces are induction-hardened to resist wear and galling at the interface with the tappet and the rocker arm adjusting screw, maintaining lash settings over long service intervals.
- Dimensional Accuracy: Manufactured to exacting straightness tolerances to prevent lateral vibration and excessive wear on the push rod guide or cylinder head passages.
- Optimal Mass: Designed for the specific inertial requirements of the 6N18 valve train to reduce spring surge and ensure the valve follows the camshaft lobe profile accurately.
Why Source from Heybeli Marine?
A bent or worn push rod is a frequent cause of “ticking” noises, inconsistent valve clearance, and eventual loss of power. Heybeli Marine protects your engine with:
- Strict OEM Interchangeability: Our 146673-14400 rods are manufactured to meet Yanmar’s exact specifications, guaranteeing that the push rod length and hardened-end geometry are perfect for your engine.
- Global Strategic Logistics: We maintain a ready-to-ship inventory of essential valve train components, ensuring that your parts are dispatched quickly to any vessel or shipyard globally.
- Quality Assurance: Every push rod is checked for straightness and surface hardness, ensuring that it will withstand the high-impact environment of a marine diesel engine.
- Comprehensive Overhaul Support: We supply these push rods alongside rocker arm components, valve springs, and rotators to ensure your engine’s top-end performs like new.
Technical Maintenance Note:
During a cylinder head overhaul or valve adjustment, always remove the push rods and inspect them for straightness. A simple test is to roll the push rod on a perfectly flat surface; any wobble indicates a bent rod that must be replaced. Additionally, inspect the ball ends for any signs of pitting, “blueing” (due to overheating), or scoring. If a push rod is removed, ensure it is reinstalled in its original position or replaced as a complete set. Always verify that the oil passage through the center of the push rod (if applicable to your specific engine lubrication circuit) is clear of any debris or sludge.