MD304859 4D56T Piston STD 91.1mm with Pin for Mitsubishi Triton L200 Pajero Diesel Engine Parts

Product Details

Product Overview

This high-performance diesel engine piston is specifically engineered for the Mitsubishi 4D56 and 4D56T engine platforms, which power a wide range of popular commercial and off-road vehicles including the Mitsubishi Triton, L200, Pajero, L300, and Montero. The piston is manufactured to the standard (STD) size of 91.1mm in diameter, ensuring a precise factory-fit replacement for engines requiring no oversize bore correction.

Identified by the OEM reference number MD304859, this component is a direct cross-reference for part numbers MD103301 and MD367352. Each piston is supplied complete with a piston pin, providing a ready-to-install solution for engine rebuilders and maintenance professionals. The design features an Al-fin or Wave combustion chamber configuration, optimized for diesel combustion efficiency and thermal management.

Key Features & Benefits

• OEM-Grade Fitment: Manufactured to the exact 91.1mm STD specification, this piston guarantees a precise fit within factory tolerances for 4D56/4D56T engines without the need for cylinder boring.
• Advanced Aluminum Alloy Construction: Crafted from high-strength AlSi12CuMgNi aluminum alloy, this piston offers superior thermal conductivity and wear resistance, ensuring longevity under high-compression diesel operation.
• Surface Treatment for Durability: Features an anodized top ring groove for reduced wear and a tin-plated skirt to minimize friction and scuffing during cold starts and break-in periods.
• Complete Kit Ready: Supplied with the matching piston pin, this unit simplifies parts procurement and ensures correct pin-to-piston clearance for reliable assembly.
• Combustion Efficiency: The Al-fin / Wave combustion chamber profile is designed to optimize fuel-air mixing, contributing to smoother power delivery and reduced emissions in turbocharged diesel applications.
• Rigorous Quality Control: Each piston undergoes outgoing inspection with a video report provided, and a machinery test report is available to verify dimensional and material integrity.

Technical Specifications

OEM Cross-Reference

This piston is a direct replacement for the following original equipment manufacturer (OEM) part numbers. Always verify your existing part number before ordering to ensure compatibility.

• Mitsubishi OEM: MD304859
• Cross Reference 1: MD103301
• Cross Reference 2: MD367352

Compatibility

This product is commonly used for the following engine and vehicle applications. Fitment should be verified against your specific engine serial number and cylinder bore condition.

• Engine Applications: Mitsubishi 4D56, 4D56T (Turbocharged)
• Vehicle Applications: For Mitsubishi Triton, L200, Pajero, L300, Montero

Note: This is a standard-size (STD) piston. It is intended for engines with cylinder bores within factory service limits. Do not use in engines requiring oversize pistons (e.g., 0.50mm, 1.00mm).

Global Supply & Distribution

We maintain a robust global supply chain capable of fulfilling orders for workshops, distributors, and fleet operators worldwide. Our export experience covers major markets including:

• North America: Reliable shipping to ports in Los Angeles, Houston, and New York for distribution across the USA, Canada, and Mexico.
• Europe: Fast delivery to Rotterdam, Hamburg, and Antwerp for European Union buyers.
• Asia-Pacific: Strategic logistics hubs serving Japan, Australia, New Zealand, and Southeast Asian markets.
• Middle East & Africa: Efficient routing to Dubai, Jeddah, and major African ports.
• South America: Regular shipments to Santos, Buenos Aires, and Callao.

All international trade documentation is provided to ensure smooth customs clearance. We offer flexible shipping options including air freight for urgent requirements and sea freight for cost-effective bulk orders.

Quality Assurance

Every piston is manufactured in ISO-compliant facilities in Guangdong, China, with strict adherence to material specifications and dimensional tolerances. Quality control measures include:

• Material Verification: Spectrometer analysis of the AlSi12CuMgNi alloy to confirm chemical composition.
• Dimensional Inspection: Precision measurement of skirt diameter, pin bore, ring groove height, and compression height using calibrated instruments.
• Testing Reports: A machinery test report is available upon request to validate performance characteristics.
• Outgoing Inspection: Video documentation of final inspection can be provided for order transparency.
• Warranty: Backed by a 6 to 12-month warranty (subject to order terms) covering manufacturing defects.

FAQ

Q: How do I confirm if this STD piston fits my engine?
A: First, verify your engine model is a 4D56 or 4D56T. Then, measure the cylinder bore diameter. The STD piston requires a bore diameter of 91.1mm within factory service limits. If your bore is worn beyond specification or has been previously machined to an oversize, this STD piston will not fit. We recommend measuring the bore at multiple points (top, middle, bottom) to check for taper and out-of-roundness before ordering.

Q: Does this piston come with rings and a pin?
A: This product includes the piston and the piston pin only. Piston rings are not included in this listing. You will need to order piston rings separately, ensuring they are for a 91.1mm STD bore and compatible with the 4D56/4D56T engine. We recommend using new rings and bearings during any piston replacement.

Q: What is the recommended installation procedure for this piston?
A: Before installation, clean the piston and lubricate the pin bore, ring grooves, and skirt with engine oil. Use a proper ring compressor to install the piston into the cylinder. Ensure the arrow or notch on the piston crown is oriented towards the front of the engine (timing chain/belt side). Torque the connecting rod bolts to the manufacturer’s specifications. After assembly, rotate the crankshaft by hand to ensure smooth movement before starting the engine. A proper break-in procedure is recommended for new pistons and rings.