The cylinders are numbered from the front of the engine to the rear in sequence 1 through 6, so the order is 1-2-3-4-5-6.
In Toyota's 2JZ-GTE and 2JZ-GE inline-six engines, this numbering is used across the board in diagrams, service manuals, and maintenance guides. The front-most cylinder (1) sits closest to the radiator and timing cover, while cylinder 6 sits at the rear near the firewall.
Cylinder numbering from front to back
The following positions show the cylinders in their front-to-back arrangement:
- 1 — Front-most cylinder (nearest the radiator and timing cover)
- 2 — Second from the front
- 3 — Middle-front cylinder
- 4 — Middle-rear cylinder
- 5 — Second from the rear
- 6 — Rear-most cylinder (nearest the firewall)
This front-to-back numbering is the standard reference used in factory diagrams, torque sequences, and parts catalogs for the 2JZ family.
Note on firing order
It’s important to distinguish cylinder numbering from firing order. The firing order specifies the sequence in which cylinders fire and can differ from the sequence of numbers. For exact firing order, consult the factory service manual for your specific 2JZ variant (2JZ-GTE or 2JZ-GE).
Summary
In short, the 2JZ engine’s cylinders are numbered 1 through 6 from front to back: 1, 2, 3, 4, 5, 6. This convention is used across official documentation to identify each cylinder’s position on the inline-six.