Daihatsu 6DL-20 Piston Set of 6

New OEM Daihatsu 6DL-20 Piston Assembly

The new OEM Daihatsu 6DL-20 Piston is a high-specification combustion-chamber component precision-engineered for the Daihatsu 6DL-20 medium-speed, four-stroke marine diesel engine platform. This critical spare part is designed to withstand structural and thermal cycling inside heavy-duty auxiliary generator sets and main propulsion configurations operating on high-viscosity Heavy Fuel Oil (HFO) or Marine Diesel Oil (MDO).

Constructed as a premium monolithic trunk-type assembly or matching high-tensile composite architecture, this standard-bore piston features optimized thermal properties and precision ring-land configurations. It ensures a gas-tight seal, eliminates combustion blow-by, minimizes crankcase oil contamination, and maintains targeted mean effective pressure under heavy cyclic load profiles.

Technical Details: 6DL-20 Piston

Features

1. Engineered for Heavy Fuel (HFO): Features induction-hardened, hard-chromed piston ring grooves designed to mitigate micro-welding, acid corrosion, and abrasive carbon-particle wear from high-sulfur residual fuel oils.
2. Internal Shake-Cooling Gallery: Utilizes a forced continuous-flow lubrication cooling loop that regulates the crown area, preventing thermal stress fracturing and localized hot spots.
3. Optimized Combustion Bowl Profile: Precision-machined crown topography maximizes air-fuel homogenization, reducing soot formation and satisfying IMO Tier II NOx emission criteria.
4. High-Stability Skirt Geometries: The structural skirt design ensures lateral stability within the cylinder liner, minimizing friction coefficients and eliminating liner cavitation or scuffing.
5. Exact OEM Specification Allocations: Sourced through official production pipelines, ensuring strict compliance with factory dimensional tolerances, structural balances, and weight distributions.

Applications

• Marine Auxiliary Gensets: Serving critical generator prime movers running continuous electrical base-loads across merchant vessel classes.
• Main Propulsion Machinery: Installed on coastal vessels, tugs, and offshore support vessels running Daihatsu DL-20 platform propulsion blocks.
• Stationary Power Plants: Industrial land-based distributed generation facilities utilizing heavy-duty medium-speed multi-cylinder auxiliary engines.

Compatible Equipment Models

• Daihatsu 6DL-20 Marine Auxiliary Diesel Generator Engine
• Daihatsu 6DL-20S Structural Auxiliary Block Variants
• Daihatsu DL-20 Engine Configurations (6-cylinder setups)

Part Number Cross-References

• Primary System Blueprint Code: 111-01 (Piston Sub-Group)
• Base Manufacturer Designation: DL20-11101A
• Marine Industry Component Identifier: DH-DL20-PST-NEW

Stock Supply Condition

Condition: New (Genuine / OEM): Completely unused in stock.

Lead Time & Shipping Info

• Dispatch Lead Time: Ships within 2 to 4 business days from our worldwide spare-parts depot locations.
• Logistics Framework: Global forwarding supported via Express Air Freight.

Installation Guide by Ndmarinetech:

1. Piston Ring Vertical Clearance Inspections: Prior to final insertion of the new piston assembly into the honed cylinder liner, calculate the vertical ring-land clearance using a set of calibrated feeler gauges. For the top compression ring groove, ensuring the clearance does not deviate from the initial design tolerances is paramount. Excessive axial clearance creates an unwanted “pumping effect” that moves engine lubricating oil into the combustion bowl, driving up oil consumption and increasing carbon deposits.
2. Piston Cooling Channel Verification: Always double-check the mechanical alignment and clarity of the connecting rod’s internal drilling and the matching small-end piston pin oil passages. A restricted or misaligned oil passage starves the piston’s internal shake-cooling gallery, raising crown temperatures beyond material threshold values and causing early thermal cracking or skirt seizure.