Guides

How to Find Your Engine Number (and Why It Is the Key to the Right Part)

By the Agroparts engine specialists · Last updated: 6 July 2026

Your engine number is the code stamped on the engine block or on a plate fixed to it. It identifies the exact build of your engine, not just the machine model. Read it, photograph it, and send it to Agroparts. Our specialists cross-reference it against OEM codes to confirm the correct part before you order.

What an engine number is and why it beats guessing by model

The engine number identifies the specific build of your engine. One machine model can leave the factory with several engine variants over its production run, and a mid-life engine swap changes it again. The number ties the part to the hardware in front of you, so you skip the guesswork that model-year matching leaves you with.

You will often see two numbers on a machine. The machine or chassis serial identifies the tractor, loader or harvester, whether it wears a Massey Ferguson, New Holland, JCB or Case IH badge. The engine number identifies the diesel unit inside it, which might be a Perkins, Cummins, FPT or Ford. For parts that touch the engine, the engine number is the one that matters, because two identical-looking machines can run different pistons, gaskets or injection components.

Guess by model and you risk the wrong part. A liner cut for a different bore, a head gasket for another build, or an injector for another calibration will not fit or will fail early. Start from the engine number and a specialist follows the exact build, then cross-references it to the correct component.

Agroparts works from this number every day. We cross-reference more than 13,000 OEM codes against over 4,300 Emmark parts, so once you give us the engine number, we trace it to the right part rather than the closest-looking one.

How to find your engine number on the machine

Look on the engine block first. Most diesel engines carry the number on a smooth stamped area machined into the block, often on the side, or on a metal number plate riveted or screwed to the block. The stamped area is a flat surface with the characters pressed straight into the metal, so wipe it clean before you read it. On makes such as Perkins, Cummins, Lister and David Brown the exact spot moves from one engine family to the next, so check a few likely faces of the block.

If the block is dirty or painted over, clean the area and hold a torch at a low angle. Stamped characters throw a shadow under angled light, which makes worn or paint-filled digits far easier to read. A wire brush lifts paint off a covered surface; use it gently so you do not damage the stamping.

Check the machine parts book and the operator manual too. They usually show where the engine number sits for that unit and how the code reads, which helps you tell it apart from the machine serial, the casting number and any part number cast into the block. Send us the make and model as well and we can point you toward the usual location for that engine.

Write the full code exactly as stamped, including letters, spaces and any prefix or suffix. One transposed character can point to a different build. When in doubt, record everything you see on the number plate and let a specialist separate the engine number from the surrounding markings.

What to do if the engine number is worn or unreadable

Worn stampings are common on machines that have spent years in the field. If corrosion, repainting or a past rebuild has erased part of the number, do not force a best guess. This is where a specialist who has rebuilt the engine, not just sold parts for it, earns their keep. Agroparts' engine specialists rebuilt hundreds of diesel engines with Emmark parts and have been an authorized Emmark distributor since 2018, so we identify an engine by the metal in front of us the way a general parts seller cannot.

We read the engine from its own hardware. The shape and markings of the head gasket point to a family. A clear photo and a few key dimensions of a piston narrow it further. The codes stamped on the bearing shells often pin down the exact build on their own, and general photos of the engine tie the rest together. Depending on the engine, we ask for whichever of these settles it, then cross-reference from there to the correct replacement.

So send us what you have. Any legible part of the engine number, even a partial one, is worth including. Then add measurements of the worn component: for a cylinder liner, the bore, the outer diameter, the flange height and the overall length; for a bearing, the width and any codes stamped on the shell; for a gasket, the overall dimensions. Photograph the old part, its markings and its mounting, and photograph the engine itself. Measurements and clear pictures together are usually enough for us to confirm a match.

Bring the machine parts book into it too. It lists the components fitted to that unit and their OEM part numbers, and an OEM code is something we can cross-reference directly. Between the parts book, your photos and your measurements, we confirm the correct part without a fully legible engine number more often than not.

How to send your engine number to Agroparts for confirmation

Send the engine number to export@agroparts.ro or on WhatsApp at +40 758 366 275. Type the code out in full and attach a clear photo of the stamped area or plate so we can check it against your reading. If you have an OEM part number from the parts book, include that as well.

Our engine specialists confirm the correct part by engine number or OEM code before you order, so you commit only once the match is verified. We check each item per part, so ask us to confirm availability on everything you need and we will. Approved resellers see prices on our B2B platform.

Once the part is confirmed, we ship. Orders within Romania arrive in 24 to 48 hours through GLS. Across Europe we ship tracked with FedEx, and we confirm the shipping quote before dispatch. Every part carries a 12-month warranty and a 365-day return window, and we hold around 7,600 parts in our Oradea warehouse ready to go.

Give us the engine number, an OEM code or clear photos, and we do the cross-referencing. Your number in, the confirmed part out, before any money changes hands.

Frequently asked questions

Where is the engine number on a diesel engine?

It usually sits on a smooth stamped area machined into the engine block or on a metal plate fixed to the block. Clean the area and use angled light to read the stamped characters. The machine parts book or operator manual shows the exact spot for your engine, and the location varies by engine make such as Perkins, Cummins or Ford. Send us the make and model and we can point you to the usual place.

What is the difference between the engine number and the machine serial number?

The machine serial identifies the whole tractor or machine, the New Holland, JCB or Massey Ferguson it is fitted to. The engine number identifies the diesel engine inside it. For engine parts, the engine number is the one that matters, because the same machine model can be built with different engine variants.

Can Agroparts find the part if my engine number is worn off?

Often, yes. Because our specialists rebuilt diesel engines with Emmark parts for years before selling their first one, we can identify an engine from its own hardware. Send any legible part of the number, clear photos of the old part and the engine, and measurements such as bore and outer diameter on a liner or the codes stamped on a bearing shell. We cross-reference those against our OEM catalogue to confirm the correct part.

How do I send my engine number to Agroparts?

Email export@agroparts.ro or message WhatsApp +40 758 366 275 with the full code and a clear photo of the stamped area or plate. Add an OEM part number if you have one. Our specialists confirm the exact part before you order, and you can ask them to check availability on each item.