Engine Piston MD304847 For MITSUBISHI 4D56-T L200 Pajero Triton Delica L300 — Verified OEM Direct Fit, 91.1mm STD Alfin Cooling Gallery Diesel Piston

The Engine Piston with OEM number MD304847 is a verified direct-fit replacement for MITSUBISHI 4D56-T (2.5L turbo diesel) engines. This piston is a critical reciprocating component responsible for converting combustion pressure into crankshaft rotation and managing thermal load within the cylinder. The 4D56-T is a 2,477 cc water-cooled inline-4 SOHC 8-valve turbocharged diesel engine with a 91.1 mm bore and 95.0 mm stroke, widely used in MITSUBISHI L200, Pajero, Triton, Delica, and L300 models from the late 1980s through the 2000s.

This piston features an Alfin insert at the ring-land area for ring-groove reinforcement, an internal cooling gallery for crown temperature management, and tin coating for improved break-in characteristics and scuff resistance. The piston is supplied in standard (STD) 91.10 mm size, with oversize options (+0.50 mm / 91.60 mm and +1.00 mm / 92.10 mm) available for worn cylinder bores.

• Dimensional Verification: Piston diameter 91.10 mm (STD), compression height 48.70 mm, total length 88.70–88.80 mm, pin diameter 29 mm, pin length 75 mm, recess depth 2.8 mm — verified against TIK, TEIKIN, and Starkmeister technical specifications for the 4D56-T platform.
• Ring Groove Geometry: Ring grooves sized 2.5 mm (top, Half Keystone/HK) / 2.0 mm (second, Half Keystone/HK) / 4.0 mm (oil control) — matched to OEM 4D56-T piston ring specifications.
• Material & Construction: Manufactured from high-grade aluminum alloy with Alfin insert for ring-land reinforcement, cooling gallery for crown temperature management, and tin coating for improved break-in. Surface treatment verified by TIK piston catalog listing (Tin coating, MD304847).
• Weight Verified: 2.750 kg gross weight per piston assembly — verified by Made-in-China supplier specification for MD304847.
• OEM Cross-Reference Verified: Replaces MD304847, MD304846, MD304848, MD304850, MD304853, MD304842, MD050009, MD050430, MD103648, MD168963, ME016895, ME013312. International brand cross-references include TEIKIN 43661A / 43661STD / 43661A050, TIK 01M91160 / 01M91106, TOTO M9110VXT, 43173STD.
• Multi-Platform Application: Confirmed compatible with MITSUBISHI L200 (K14T, K34T, K60T, K64T), Pajero (L049G, V24W, V44W), Delica (P25W), L300 (P0V, P1V, P2V, P1T), Pajero Sport, Triton IV (KA, KB), and Space Gear.

• Loss of engine compression: Worn or stuck piston rings reduce cranking pressure, causing hard starting and noticeable power loss under load — particularly noticeable on the 4D56-T under turbo boost.
• Excessive exhaust smoke (blue/white/black): Indicates oil passing rings or incomplete combustion — piston and ring replacement often resolves it.
• Increased oil consumption: Glazed bores or tired ring packs allow oil to enter the combustion chamber, raising operating costs.
• Piston scoring or scuffing: Visible skirt wear or liner wall scoring caused by thermal expansion, insufficient lubrication, or turbo-related heat stress — requires immediate replacement to prevent catastrophic engine failure.
• Knocking or tapping noise: Piston slap or bearing wear requires inspection before further engine operation.

Confirmed Fitment Sources: Partsouq confirms MD304847 as "PISTON & PIN ASSY" for STRADA K34T (09.1993–05.1997) with grade STD B. Takora confirms fitment for Delica 2.5 4D56T P25W (1994–1996), L200 2.5 4D56 K14T/K34T (1995–1998), and Pajero 2.5 4D56T L049G/V24W/V44W. Auto parts catalogs confirm L200 K60T, Triton IV (KA, KB), Pajero Sport, Pajero L040, L200 Mk2, L300 Minibus, Space Gear, and L400 Van applications.

• Piston Grade: MD304847 corresponds to STD grade B per Partsouq catalog. Grades A, B, and C indicate matched piston-to-bore tolerance. During engine rebuild, all four pistons should use the same grade for consistent clearance.
• Confirm engine variant: 4D56-T (turbocharged, 91.1 mm bore) vs. 4D56 (naturally aspirated, same bore). Both use the same piston, but always verify against the engine tag.
• Oversize Options: For worn cylinder bores, +0.50 mm (91.60 mm) and +1.00 mm (92.10 mm) pistons are available — specify at inquiry.
• Piston rings are NOT included unless specified — confirm package contents at the time of inquiry.
• Always verify OEM number against the engine tag or vehicle documentation before ordering.

Manufacturing conforms to ISO/TS16949 and ISO9001 quality management system standards. Each piston undergoes 100% quality inspection before packaging.

1. Verify fitment: Confirm piston diameter (91.10 mm), compression height (48.70 mm), and ring groove dimensions (2.5HK / 2.0HK / 4.0 mm) against removed OEM piston. Verify piston grade (A/B/C) matches original.
2. Check piston-to-bore clearance: Measure cylinder bore and piston skirt diameter; compare against manual specification. If cylinder bore wear exceeds OEM limits, select appropriate oversize piston (+0.50 / +1.00 mm) and bore/hone accordingly.
3. Ring installation: Install rings with correct orientation (top ring marking up); use a ring expander to avoid breaking rings. Stagger ring end gaps at 120° intervals.
4. Check ring end gap: Insert each ring into its cylinder and measure end gap with a feeler gauge. Compare against manual specification.
5. Pin & clip installation: Lubricate pin bore and install piston pin (29 × 75 mm); secure with new circlips (included).
6. Connecting rod torque: Follow manual sequence — always confirm against the specific engine variant manual.
7. Lubricate: Coat rings and cylinder walls with clean engine oil before piston installation. Use a ring compressor for piston insertion.
8. Check liner protrusion: Verify liner protrusion meets specification before final assembly.

• 4D56-T engine oil capacity: approximately 5.5–6.0 L including filter. Replace engine oil every 5,000–10,000 km or 12 months, whichever comes first.
• Oil type: MITSUBISHI-approved 10W-30 or 15W-40 API CF/CD (or higher).
• Inspect compression and oil consumption at every 50,000 km or annually.
• Replace piston rings and inspect pistons during any top-end overhaul.
• Monitor turbocharger boost pressure and EGT — excessive heat degrades piston crown integrity over time.

• Standard packing: Neutral packaging / corrugated carton; 4 pcs (one set) per box; wooden pallet available for bulk orders.
• Set options: Standard size (STD 91.10 mm), +0.50 mm (91.60 mm), +1.00 mm (92.10 mm) — specify at inquiry. Piston-only or piston set with pin & circlips available.
• Suitable for: Engine rebuild workshops, fleet maintenance departments, spare parts distributors, and export wholesalers.
• Related parts available: Piston ring set (2.5HK + 2.0HK + 4.0 mm), piston pin (29 × 75 mm), circlips, cylinder liner kit (91.1 mm), and full 4D56-T overhaul kit.