For maintenance managers, fleet operators, and parts professionals working with Caterpillar, Clark, Hyster, Jungheinrich, or Mitsubishi forklifts, the 4G64 is not an obscure engine — it is the engine. This guide covers everything you need to know: Mitsubishi 4G64 engine specifications, fuel type, compatible equipment, how the 4G64 compares to its sibling, the 4G63, and where to source quality aftermarket parts.
Mitsubishi 4G64 Engine Specifications
The 4G64 is built on a cast-iron cylinder block — the same fundamental architecture as the 4G63 — but with a taller deck height of 235 mm, a longer stroke crankshaft, and a larger bore to achieve the additional 350 cc of displacement. The result is an engine optimised for low-end torque, the defining characteristic that makes it so well-suited to forklift and material handling applications. It is a water-cooled, four-valve-per-cylinder inline-four that uses a timing belt-driven valvetrain and, on most versions, Mitsubishi Motors balance shafts for smoother operation.
Depending on application, the 4G64 is available with different compression ratios and fuel system combinations, including multi-point fuel injection and GDI on some variants. Fuel type also varies by use case: gasoline is standard for automotive and many industrial applications, while LPG and CNG versions are common in forklifts.
| Specification | Details |
|---|---|
| Engine Family | Mitsubishi Sirius (4G6 series) |
| Also Known As | G64B (early designation) |
| Production Years | 1983 – present |
| Configuration | Inline-4, naturally aspirated |
| Displacement | 2,351 cc (143.5 cu in) |
| Cylinder Bore | 86.5 mm (3.41 in) |
| Piston Stroke | 100 mm (3.94 in) |
| Deck Height | 235 mm |
| Cylinder Block Material | Cast iron with balance shafts |
| Cylinder Head Material | Aluminium alloy |
| Valvetrain | SOHC 16V (standard) / DOHC 16V (GDI variant) |
| Connecting Rod Length | 150 mm |
| Compression Ratio | 8.5:1 – 11.5:1 (varies by variant) |
| Power Output | 112–150 HP (84–112 kW) depending on variant |
| Torque Output | 184–225 Nm (136–166 lb·ft) |
| Fuel Types | Gasoline, LPG, CNG (forklift applications) |
| Fuel System | Multi-point fuel injection / GDI (variant) |
| Ignition | Distributor (early) / Coil-on-plug (later) |
| Timing System | Belt-driven SOHC (replacement interval: 60,000 miles / 90,000 km or every 4,000 hours in forklift service) |
| Engine Oil Capacity | 4.0 L (4.2 qt) |
| Recommended Engine Oil | 10W-30 / 10W-40 (forklift); 5W-30 / 5W-40 (automotive) |
| Cooling System | Water-cooled with integrated water pump |
| Engine Weight | Approx. 150–160 kg (330–350 lbs) |
| Crankshaft Weight | 15.8 kg |
| Service Life (forklift) |
8,000–12,000+ operating hours (with proper maintenance) |
Forklift & Industrial Equipment Applications
| Brand | Model Series | Capacity Range | Fuel Type | Notes |
|---|---|---|---|---|
| Caterpillar (CAT) | GC20, GC25, GC30, GC35, GP20, GP25, GP30 | 4,000–7,000 lb | LPG / Gasoline | 1993–2005 production; non-balanced block standard |
| Mitsubishi | FG30, FG35A, FG30K, FG35K | 6,000–7,000 lb | Gasoline / LPG | OEM application; original 4G64 installation |
| Clark | GC25, GC30, GC32, GCX25, GCX30 | 5,000–6,500 lb | LPG / Gasoline / CNG | Balanced block version in some Clark models |
| Hyster | H40-60XM, H50-60XMS, H50FT, H60FT | 4,000–6,000 lb | LPG / Gasoline | Verify the serial number for the correct engine spec |
| Jungheinrich | ETFG25, ETFG30, TFG25, TFG30 | 5,000–6,600 lb | LPG | European market models; emission-compliant variant |
| Yale | GLP040, GLP050, GLP060 | 4,000–6,000 lb | LPG / Gasoline | Shares platform with Hyster XM-series |
4G64 vs 4G63: Key Differences
| Specification | 4G63 | 4G64 |
|---|---|---|
| Displacement | 1,997 cc (2.0L) | 2,351 cc (2.4L) |
| Bore | 85.0 mm | 86.5 mm (+1.5 mm) |
| Stroke | 88.0 mm | 100.0 mm (+12 mm) |
| Deck Height | 229 mm | 235 mm (+6 mm taller) |
| Balance Shafts | No | Yes (on most variants) |
| Piston Oil Squirters | Yes (turbo versions) | No |
| Power (stock NA) | 120–145 HP | 112–150 HP |
| Torque characteristic | Higher revving | More low-end torque |
| Turbo capability | Factory turbocharged (4G63T) | Naturally aspirated only (factory) |
| Primary use | Performance vehicles, forklifts (smaller) | Medium forklifts, commercial vehicles |
| Head gaskets | Different thickness | Different thickness – not interchangeable |
| Pistons | Shorter compression height | 35 mm compression height |
Key Maintenance Intervals for the 4G64 (Forklift Service)
| Service Item | Interval | Notes |
|---|---|---|
| Engine oil & filter | Every 250 hours | 10W-30 recommended for forklift duty; more frequent in dusty environments |
| Timing belt | Every 4,000 hours or 3–4 years | Critical: 4G64 is an interference engine — belt failure causes valve-piston contact |
| Water pump | Replace with timing belt | Driven by the same belt; replacement cost is minimal vs. labour cost of second service |
| Air filter | Every 500 hours | More frequently in high-dust warehouse or outdoor environments |
| Fuel filter (LPG) | Every 1,000 hours | LPG vapour filters accumulate oil mist from the regulator |
| Spark plugs | Every 1,000 hours | Platinum or iridium plugs extend interval; standard copper plugs require shorter intervals |
| Coolant flush | Every 2,000 hours or 2 years | Aluminium cylinder head is susceptible to corrosion from depleted coolant additives |
| Valve clearance | Not required (hydraulic lifters) | All 4G64 variants use hydraulic lash adjusters — no periodic adjustment needed |
What cars use the 4G64 engine?
The 4G64 engine has been used in Mitsubishi Galant models and other Mitsubishi Motors applications, as well as in various forklifts and industrial machines from brands such as Caterpillar, Clark, Hyster, Jungheinrich, and Yale.
Is the 4G64 an interference engine?
Yes. The 4G64 is an interference engine, so timing belt failure can cause valve-to-piston contact. That is why regular timing system service and water pump replacement are so important.
How much horsepower can a 4G64 handle?
In stock form, the 4G64 typically produces about 112–150 HP depending on the variant. Its low-end torque and durable bottom end make it suitable for heavy-duty use, but output depends on the specific application and fuel system.
PARTS & ASSEMBLIES · WORLDWIDE SHIPPING
Need a 4G64 Engine Assembly or Parts?
SINOCMP stocks the complete Mitsubishi 4G64 2.4L engine assembly for Caterpillar, Mitsubishi, Clark, Hyster, and Jungheinrich forklifts — quality-inspected, ready to ship via DHL, FedEx, and UPS with a 1-12 month warranty. Send us your machine model or engine nameplate for a fast compatibility check.
