ME133275 Piston Suit for Mitsubishi 6M60 Diesel Engine

Structural Features and Advantages

The ME133275 piston suit is a complete top-end rebuild kit engineered specifically for the Mitsubishi 6M60 diesel engine, a rugged 6-cylinder powerplant widely used in commercial vehicles and industrial equipment. This suit typically includes the piston body, piston rings (compression and oil control), piston pin (wrist pin), and retaining rings. The piston itself is manufactured from high-silicon aluminum alloy with a reinforced crown section to withstand peak cylinder pressures up to 180 bar. Its combustion bowl features a re-entrant design (omega-shaped) optimized for Mitsubishi’s common-rail injection system, promoting complete fuel-air mixing and soot reduction. The piston skirt is coated with a graphite-based friction-reducing layer and includes an offset pin bore to minimize slap noise during cold starts. Three ring grooves are machined with hard anodized surfaces: the top groove accepts a keystone-shaped compression ring for sealing under high thermal expansion, the second groove uses a tapered compression ring, and the third has a three-piece oil control ring with a coil expander. Key advantages of the ME133275 piston suit include improved oil consumption control (less than 0.5% of fuel consumption), reduced blow-by for better crankcase ventilation, and compatibility with both Euro 3 and Euro 4 emissions standards of the 6M60 engine.

Core Working Principle

The piston suit functions as the primary component of the combustion chamber converting chemical energy into mechanical work. During the intake stroke, the piston moves downward, drawing filtered air into the cylinder or, in turbocharged 6M60 versions, receiving compressed air from the turbocharger and intercooler. As the piston rises on the compression stroke, it compresses the air to temperatures exceeding 500°C. At the top dead center, the engine’s fuel injector sprays atomized diesel into the re-entrant combustion bowl, where auto-ignition occurs. The expanding gases force the piston downward on the power stroke, transmitting force through the connecting rod to the crankshaft. The precisely profiled ring pack (top ring sealing combustion pressure, second ring scraping oil from cylinder walls, and oil ring controlling lubrication) ensures minimal gas leakage and oil passage. The offset piston pin reduces thrust load on the cylinder wall, allowing the 6M60 engine to produce its rated torque (typically 580–700 Nm) with lower frictional losses. As the piston returns upward on the exhaust stroke, it pushes burnt gases out through the exhaust valves, ready for the next cycle.

Main Application Equipment

The ME133275 piston suit is used in Mitsubishi 6M60 diesel engines found in the following equipment:

• Heavy-duty trucks – Mitsubishi Fuso Super Great, Shogun, and Fighter models (payloads 15–30 tons).

• Medium-duty trucks – Mitsubishi Fuso Canter with 6M60 option (e.g., export markets).

• City and intercity buses – Mitsubishi Fuso Aero Star, Rosa (larger variants), and school buses.

• Construction machinery – Mitsubishi excavators (e.g., MS110, MS130 series), wheel loaders, and bulldozers.

• Industrial forklifts – Large capacity diesel forklifts (8–16 tons) for ports and heavy warehousing.

• Agricultural irrigation pumps and stationary generator sets powered by the 6M60 industrial platform.

• Marine auxiliary engines in smaller workboats where 6M60 is used as a generator driver.

Because the Mitsubishi 6M60 is a popular engine in Asia, Middle East, Africa, and South America, the ME133275 piston suit is a high-demand spare part for engine rebuilders and fleet maintenance workshops.

Common Failure Symptoms & Repair/Replacement Guidelines

Failure symptoms indicating a worn or damaged ME133275 piston suit in a 6M60 engine:

• High oil consumption – Blue smoke from the exhaust, especially when decelerating, and oil level dropping noticeably after a few hundred kilometers.

• Excessive blow-by – Visible smoke or pressure pulses from the oil fill cap or crankcase breather, often accompanied by oil leakage from seals.

• Knocking or tapping noise – Metallic sound that changes with engine speed (piston slap), most audible during cold start and diminishing as the engine warms.

• Low compression on one or more cylinders – Engine struggles to start cold, runs rough, or lacks power under load. A compression test reveals cylinder(s) below 25 bar (nominal is 35–40 bar).

• Fuel dilution of engine oil – Thin, diesel-smelling oil due to incomplete combustion bypassing worn rings.

• Carbon buildup in the combustion bowl – Detected via borescope; causes hot spots and potential piston crown melting in severe cases.

Repair and replacement points:

• Always inspect the cylinder liner (or bore) when replacing pistons. If the bore shows scoring, out-of-roundness (>0.05 mm), or excessive taper, it must be honed or the liner replaced with a matching oversize piston (if available).

• Use the complete ME133275 piston suit – mixing old rings with new pistons or reusing old pins is not recommended.

• Check connecting rod for straightness and small-end bushing wear. Replace the bushing if pin clearance exceeds 0.03 mm.

• When installing new piston rings, stagger the ring gaps 120° apart and verify ring end gap (typically 0.35–0.55 mm for top ring, 0.40–0.60 mm for second ring, and 0.25–0.45 mm for oil ring).

• Soak the piston and rings in clean engine oil before installation. Use a piston ring compressor to avoid ring breakage.

• Torque connecting rod bolts to factory specification: typically 95–105 Nm (plus 90° angle tightening for torque-to-yield bolts – use new bolts).

• After overhaul, perform a break-in procedure: run engine at 1200–1500 RPM with moderate load for 30 minutes, then change oil and filter. Avoid full throttle for the first 100 km.

Why Choose Rsolid Engine Parts for the ME133275 Piston Suit

Rsolid Engine Parts (www.rinjector.com) supplies premium-grade ME133275 piston suits for Mitsubishi 6M60 engines, manufactured to meet or exceed OEM material and dimensional specifications. Advantages of sourcing from Rsolid include:

• Original-equipment fitment – Each piston suit is machined to the exact compression height (pin center to crown), bowl volume, and ring groove dimensions of Mitsubishi genuine parts.

• High-quality ring sets – Rings are made from ductile cast iron (top ring with plasma moly coating) and stainless steel oil rings, offering long service life and immediate sealing after break-in.

• Rigorous quality control – 100% inspection of critical dimensions: skirt profile, pin bore roundness, ring groove parallelism, and weight matching (all pistons within ±5 grams for engine balance).

• Ready stock and fast dispatch – Large inventory for 6M60 pistons; express shipping worldwide via DHL/FedEx.

• Technical assistance – Free advice on ring gap calculation, liner selection, and torque procedures via WhatsApp.

• Competitive pricing – Lower cost than dealer parts, with volume discounts for workshops and rebuild centers.

Order the ME133275 piston suit for your Mitsubishi 6M60 overhaul project today. Contact WhatsApp: +8615975376778 or visit www.rinjector.com to check pricing and availability.