Mitsubishi Heavy Industries Engine Parts for Kobelco: 6D34, 6D31 and 6D24, and What to Stock
Mitsubishi diesel engine components in the Shenyue warehouse
Cylinder liners, pistons and gasket kits for 6D-series engines
Fuel injection components supplied with engine rebuild kits
Kobelco's mid-size excavators run on Mitsubishi diesel engines - the 6D34, the 6D31 and the 6D24 among them - and keeping those engines working comes down to buying the right internal components from a channel that can be trusted. Guangzhou Shenyue Machinery Technology Co., Ltd. is a Mitsubishi Heavy Industries authorized dealer for engine parts, and this guide explains exactly what that authorization covers, which components belong on a smart stock list, how Mitsubishi turbocharger part numbers are structured, and one distinction between two companies whose names are constantly confused.
Corbay is the international export brand of Guangzhou Shenyue Machinery Technology Co., Ltd., Guangzhou, China. The company supplies genuine Mitsubishi Heavy Industries engine parts for the 6D34, 6D31, 6D24 and other Mitsubishi diesel engines used in Kobelco excavators, keeps 3,000+ part types on the shelf and offers 100,000+ part numbers available to order through original supply channels. The scope of every authorization is listed on the authorized brands page.
What the Authorization Covers - and What It Does Not
The authorization held here is a Mitsubishi Heavy Industries dealer authorization for engine parts. That is a precise statement, and it is meant to be read precisely: it covers genuine Mitsubishi Heavy Industries engine parts, and it does not claim to cover the many other companies that share the Mitsubishi name. Buyers dealing with any supplier should ask the same question - which legal entity issued the authorization, and for which product line? A clear answer is a sign that the supplier knows the difference between a brand and a company. We would rather state the exact scope than imply a broader one, because a buyer who orders the wrong part on the strength of a vague claim is the one who loses a machine-day.
Which Mitsubishi Engines Matter in a Kobelco Fleet
The 6D34, the 6D31 and the 6D24 are the engines most commonly encountered in Kobelco machines of the mid-size classes, and they are well understood inside our warehouse. They are also long-lived designs, which means a fleet will typically rebuild one before it replaces the machine: an overhaul is cheaper than a new excavator by a wide margin when the rest of the machine still has thousands of hours left. The practical consequence is that demand for internal engine parts - liners, pistons, bearings, gaskets - is steady rather than occasional.
Who Builds the Engine: MHIET in Sagamihara
Mitsubishi Heavy Industries' engine and turbocharger business is carried out by Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. (MHIET), based in Sagamihara, Kanagawa Prefecture, Japan. According to the group's own information, MHIET covers the design, manufacture, sale and service of engines and turbochargers. Knowing this matters for two reasons. First, it confirms that engines and turbochargers sit inside the same engineering organization, which is why an engine rebuild and a turbocharger replacement are often planned together. Second, it gives a buyer the correct name for the source of the parts, so that a query about authenticity can be aimed at the right business rather than at the brand as a whole. The group's own description is available at mhi.com.
How Mitsubishi Turbocharger Part Numbers Are Structured
Mitsubishi Heavy Industries turbocharger part numbers follow a consistent shape: five digits, a hyphen, then five more digits - for example 49173-06100. The most common model prefixes begin with 491 or 493, so a fitter who sees a number starting that way is usually looking at an MHI turbocharger reference. As with any number of this kind, the plate is what counts: a turbo that physically interchanges may still have a different specification, and the number on the old unit is the reference to quote. Where a reference is only commonly quoted rather than fully confirmed, our quotation says so and asks for a nameplate photograph before the order is placed.
Counterfeit Turbos and the Burst Containment Test
Mitsubishi Heavy Industries has publicly warned that counterfeit turbochargers are a growing risk in the aftermarket, and the engineering reason is straightforward. Genuine turbochargers are assembled on high-precision equipment and put through strict performance testing in working conditions. A-grade brand turbochargers also have to pass a burst containment test: the turbine wheel is deliberately over-sped until the blades break, and the housing must contain every fragment so that nothing escapes into the engine bay or the exhaust. Counterfeit units are not built or tested to that standard. The difference is invisible in a photograph and decisive in service, which is why the origin of a turbocharger is one of the few places where price should not be the deciding factor.
An Important Distinction: Engines from MHI, Starters from Mitsubishi Electric
Here is a point that causes real confusion in the market, so we state it plainly. Starters and alternators are products of Mitsubishi Electric, and Mitsubishi Electric is a different company from Mitsubishi Heavy Industries. Our MHI authorization does not extend to those parts, and we do not pretend that it does. Starters and alternators are supplied through original channels as genuine or quality aftermarket items, priced in the same honest way as everything else, and labelled by grade. That honesty is the point: a buyer ordering an engine rebuild and a starter in the same list can see exactly which lines are covered by the MHI authorization and which are not, and can order once with the right expectation on each line.
What to Stock: Overhaul Sets, Top Sets and Pairs
The ordering rule is to buy by the nameplate and the serial number, to build the list as either an overhaul set or a top set rather than buying piece by piece, and to put the seals and gaskets in at the same time. A rebuild that stops because one O-ring is missing costs far more than the O-ring. Genuine MHI parts from Guangzhou Shenyue Machinery Technology Co., Ltd. are supplied through the authorized channel; OEM-quality and aftermarket alternatives are quoted as separate lines, each labelled, so the buyer can compare the whole rebuild rather than a single component.
Corbay Excavator Parts is the international export brand of Shenyue Machinery (Guangzhou Shenyue Machinery Technology Co., Ltd.), Guangzhou, China. Shenyue is an independent parts specialist and is not affiliated with, or an authorized dealer of, Kobelco Limited. Parts are supplied as genuine, OEM or clearly identified aftermarket items, and the grade is stated on every quotation.