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Mitsubishi 2.5-liter 2477 cc inline-four turbocharged diesel engine 4D56GA0819 4D56KD6289
Basic Physical & Mechanical Specifications (Core Architecture)
| Major Category | Technical Parameter | Standard Value / Specification | Remarks |
|---|---|---|---|
| Engine Block | Cylinder Arrangement | Inline 4-Cylinder (Inline-4) | Cast Iron Block, highly durable and rigid. |
| Displacement | Exact Displacement | 2,477 cc (Commonly referred to as 2.5L) | Bore × Stroke: 91.1 mm × 95.0 mm. |
| Firing & Valves | Firing Order / Valves | 1-3-4-2 | Early models: SOHC 8-Valve; Late models: DOHC 16-Valve. |
| Fuel Type | Fuel Requirement | Light Diesel Oil | Fuel delivery evolved heavily across generations. |
| Valvetrain Drive | Drive Type | Timing Belt | Dual belt system containing both Timing Belt & Balance Shaft Belt. |
| Cooling & Oil | Cooling / Oil Capacity | Water-Cooled / Approx. 5.4L - 6.5L | Highly sensitive to heat; requires strict maintenance. |
Engine Overhaul Torque Specifications (Workshop Standard)
| Critical Component Fastener | Metric Torque (Nm) | Imperial Torque (ft-lbs) | Crucial Assembly Remarks |
|---|---|---|---|
| Cylinder Head Bolts | 118 Nm (Non-Throttle Body) or 29 Nm ＋ Turn 120° |
Approx. 87 ft-lbs | Critical failure point for 4D56. Tighten in 3 progressive steps in a crosswise pattern from inside out. |
| Main Bearing Caps | 78 - 85 Nm | 55 - 63 ft-lbs | Ensure assembly lube is applied to new bearing shells. |
| Connecting Rod Caps | 27 Nm ＋ Turn 90° - 94° | Approx. 20 ft-lbs + Angle | Torque-to-yield stretch bolts (plastic-region method). Replacing with brand-new bolts is highly recommended. |
| Crankshaft Pulley Bolt | 265 - 275 Nm | Approx. 133 ft-lbs | Must be fully torqued; loose bolts can cause the harmonic balancer/pulley to shearing off under load. |
| Flywheel Bolts | 130 Nm | 96 ft-lbs | Apply medium-strength thread-locking compound (e.g., Loctite) to the bolt threads. |
Procurement & Wear-and-Tear Component Cross-Reference (BOM Selection Guide)
| Component Name | Key Specifications & Differences | Purchasing & Sourcing Tips |
|---|---|---|
| Cylinder Head Assembly | 1. Recessed-Valve Type (Valves sit below head surface) 2. Flush-Valve Type (Valves sit flush with head surface) |
GA (Older) is mostly 8-Valve recessed or flush type. KD (Newer) is strictly 16-Valve DOHC. They are absolutely NOT interchangeable! |
| Pistons & Piston Rings | 1. Piston Pin Diameter (varies between 29mm and 32mm) 2. Crown/Combustion Bowl profile differences |
Common Rail pistons (KD) feature a distinct "crater-like" direct injection combustion bowl. They cannot be replaced by mechanical IDI (GA) pistons. |
| Timing Belt Kit | 1. Main Timing Belt Tooth Count: 163 teeth / 154 teeth etc. 2. Balance Shaft Belt: Typically 99 teeth |
When servicing, always replace both the main timing belt and the smaller balance shaft belt. If the balance shaft belt snaps, it frequently tangles into the main belt, causing bent valves. |
| Cylinder Head Gasket | Thickness Grades: Grade A (Thinnest), Grade B (Medium), Grade C (Thickest) | Match the grade based on piston protrusion height above the block surface (indicated by notches or small holes on the edge of the gasket). |
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