The 129685-22090 4TNV86 Piston Assy is a high-quality, precision-engineered component essential for the optimal functioning of Yanmar 4TNV86 series diesel engines. Designed to meet stringent industrial standards, this piston assembly ensures robust performance, exceptional durability, and efficient power delivery in various heavy-duty applications. Manufactured with superior materials and advanced techniques, it provides a perfect fit and reliable operation, contributing significantly to the longevity and efficiency of your engine.
Our commitment to quality guarantees that each piston assembly enhances engine compression, reduces friction, and maintains stable combustion, leading to improved fuel economy and reduced emissions. Trust this genuine replacement part for seamless integration and uncompromised engine performance.
| Parameter | Value |
|---|---|
| Part Number | 129685-22090 (also 729685-22090) |
| Applicable Engine Model | Yanmar 4TNV86 Series (e.g., 4TNV86-TK, 4TNV86CT) |
| Number of Cylinders | 4 |
| Bore x Stroke | 86 mm x 90 mm |
| Displacement | 2.09 L (128 cu in) |
| Combustion System | Direct Injection |
| Compression Ratio | Typically 19.1 or 19.2 |
Superior Durability: Constructed from high-strength alloys, engineered to withstand extreme pressures and temperatures, ensuring a longer service life and reduced wear.
Optimal Engine Performance: Guarantees precise compression and efficient combustion, leading to maximized power output and smoother engine operation.
Enhanced Fuel Efficiency: Designed for an exact fit within the cylinder bore, minimizing blow-by and optimizing fuel consumption.
Reduced Emissions: Contributes to cleaner exhaust by promoting complete fuel combustion, aligning with modern environmental standards.
Reliable Operation: Critical for maintaining engine health, preventing common issues like low compression, and ensuring consistent power delivery in demanding environments.
Perfect Compatibility: Specifically designed for Yanmar 4TNV86 series engines, ensuring hassle-free installation and factory-level performance.
The 129685-22090 4TNV86 Piston Assy is suitable for a wide range of equipment powered by Yanmar 4TNV86 diesel engines, known for their versatility and reliability across various industries:
Construction Equipment: Essential for compact excavators, mini excavators, skid steers, and other heavy machinery requiring consistent power and durability on job sites.
Agricultural Machinery: Powers tractors, harvesters, tillers, and rice driers, ensuring strong torque at low RPMs for demanding farm work.
Industrial Applications: Found in various industrial machinery and commercial vehicles where robust and efficient diesel power is critical for continuous operation.
Generator Sets: Provides reliable power generation in both standby and prime power applications, ensuring stable electricity output even under varying loads.
Marine Applications: Utilized in small fishing boats, yachts, and other vessels, delivering dependable propulsion in diverse marine environments.
Refrigeration Units: Integrated into specific refrigeration equipment (e.g., those using 4TNV86-TKHA engines) for consistent cooling performance.
Consider a compact excavator operating on a construction site. The Yanmar 4TNV86 engine, equipped with the 129685-22090 Piston Assy, consistently provides the necessary power for digging, lifting, and maneuvering. In such demanding environments, the piston assembly's ability to maintain high compression and withstand heavy loads is crucial. Its robust design prevents premature wear, ensuring the excavator can operate for long hours without loss of power or increased fuel consumption. Similarly, in agricultural tractors, this piston assembly ensures that the engine delivers strong, reliable torque for plowing and harvesting, even in challenging soil conditions. The engine's thermal stability, supported by high-quality components like this piston, allows for sustained operation without overheating, a critical factor for productivity in diverse climates.
To maintain and optimize your Yanmar 4TNV86 engine, consider these related and similar products:
Yanmar 4TNV86 Overhaul Gasket Kit: Essential for complete engine overhauls, ensuring all seals and gaskets are replaced for leak-free performance. Applicable for full engine rebuilds in all 4TNV86 applications.
Cylinder Liners: Provide the optimal surface for piston movement, crucial for maintaining proper compression and reducing wear. Suitable for engines showing cylinder wall wear.
Main and Rod Bearings: Critical for smooth crankshaft and connecting rod rotation, reducing friction and supporting high loads. Applicable for engines experiencing bearing wear or during rebuilds.
Intake and Exhaust Valves: Regulate gas flow in and out of the combustion chamber. Necessary replacements for engines with valve train issues or during cylinder head servicing.
Connecting Rod Assembly: Connects the piston to the crankshaft, converting reciprocating motion into rotational motion. Replaced if bent, cracked, or excessively worn.
Fuel Injectors: Deliver precise amounts of fuel into the combustion chamber. Important for maintaining fuel efficiency and reducing emissions. Applicable for engines with poor fuel atomization or misfires.
Proper installation and regular maintenance are crucial for the longevity and performance of your 129685-22090 4TNV86 Piston Assy and the entire engine. Here are common issues and their solutions:
Issue: Low Compression.
Often caused by improperly sealed piston rings, worn piston rings, or damaged valve seats. If compression is low (e.g., around 400psi vs. healthy 600psi for Yanmar diesel), the engine may be difficult to start or lack power.
Solution: Ensure piston rings are correctly installed and seated. Check for valve wear or damage and replace if necessary. Inspect cylinder liners for scoring. Always use new piston rings when replacing the piston assembly.
Issue: Engine Burn-in / Rod Metal Wear.
Typically due to insufficient lubrication, prolonged use of contaminated engine oil, or clogged oil filters, leading to increased friction and eventual component failure, including piston interference with the cylinder head.
Solution: Adhere strictly to manufacturer-recommended oil change intervals and use only specified lubricants and filters. Regularly inspect oil pressure and ensure no blockages in the lubrication system. Address any abnormal oil pressure drops immediately.
Issue: White Smoke from Exhaust.
Can indicate unburnt fuel, insufficient compression, or coolant leaking into the combustion chamber. Piston assembly issues, especially poorly sealing rings, contribute to low compression.
Solution: Verify fuel injection timing and injector condition. Check for proper piston ring seal and ensure no coolant leaks. A compression test can diagnose if piston rings are the culprit.
Issue: Premature Wear / Damage to Components.
Incorrect installation, failure to clean engine components thoroughly before assembly, or using non-OEM parts can lead to premature wear of the piston, rings, or cylinder walls.
Solution: Always ensure a clean environment during assembly. Lubricate all moving parts during installation. Use torque wrenches for precise fastening according to factory specifications. Use only high-quality, compatible replacement parts.
Regular maintenance, including timely oil and filter changes, fuel system checks, and monitoring engine performance indicators, will significantly extend the life of your 129685-22090 Piston Assy and your Yanmar 4TNV86 engine.
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