Question 1

What is an Engine Serial Number (ESN)?

Accepted Answer

An Engine Serial Number (ESN) is a unique identifier stamped on every diesel engine during manufacturing. It encodes the manufacturer, engine series, and production sequence. Each manufacturer uses a different format — for example, Detroit Diesel ESNs start with "06R" for Series 60 engines, while Cummins uses alphanumeric codes that indicate displacement and configuration.

Question 2

How do I find my diesel engine serial number?

Accepted Answer

The ESN is typically stamped on a metal plate or directly on the engine block. For Detroit Diesel engines, check the valve cover or block near the oil filter. Cummins engines have the ESN on the dataplate on the rocker cover. Caterpillar engines display it on the information plate on the valve cover. Enter the ESN into the Heavi ESN Lookup tool to instantly identify your engine.

Question 3

What diesel engine brands does this ESN lookup support?

Accepted Answer

The Heavi ESN Lookup supports six major heavy-duty diesel engine manufacturers: Detroit Diesel (Series 60, DD13, DD15, DD16), Cummins (ISX, ISB, ISL, X15), Caterpillar (C13, C15, 3406), Navistar (DT466, MaxxForce), Mack/Volvo (MP7, MP8, D13), and PACCAR (MX-13, MX-11).

ESN Lookup

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Supported Manufacturers