The third cylinder in a 2008 Versa with the 1.8L inline-four (QR18DE) is the third position from the front of the engine toward the firewall. In practical terms, cylinder 3 sits toward the back of the engine block when you’re looking at the valve cover from above.
Understanding the Versa’s cylinder layout
The Versa uses a four-cylinder inline engine. Cylinders are numbered 1 through 4 in a front-to-back sequence from the timing-gear end toward the firewall. This means cylinder 1 is closest to the timing components, and cylinder 4 is nearest the firewall. Cylinder 3 is the third position in that row, i.e., the second from the back.
How to physically locate Cylinder 3 in the engine bay
Use these practical methods to identify Cylinder 3 with confidence.
Method A: Front-to-back counting from the timing end
- With the hood up, locate the front of the engine (the end closest to the radiator). The cylinders run in a line from front to back.
- Start at the frontmost spark plug well or coil and count toward the firewall: 1, 2, 3, then 4.
- Identify the third position in that sequence—this is Cylinder 3. The spark plug or coil in that position corresponds to Cylinder 3.
- For extra certainty, compare with a diagram from the service manual or a labeled engine diagram for the QR18DE.
Using this method, Cylinder 3 is the third position from the radiator side, i.e., the second cylinder from the back in the row.
Alternatively, you can verify Cylinder 3 by looking for visual cues on the valve cover and coil layout.
Method B: Visual cues on the valve cover and coil packs
- Look for small numbers stamped or painted near each spark plug well or coil pack on the valve cover. Many engines mark the cylinders 1–4 in order from front to back.
- On the QR18DE, ignition coils are arranged along the valve cover. If the coils are labeled in order, the third coil corresponds to Cylinder 3.
- When in doubt, refer to the Nissan service diagrams or the owner’s manual for a labeled engine layout to confirm the cylinder order.
These cues provide a quick cross-check if you’re performing maintenance and want to avoid misidentifying cylinder 3.
Summary
Cylinder 3 on a 2008 Nissan Versa is the third cylinder in the front-to-back order of the inline-four engine, i.e., the second cylinder from the back toward the firewall. You can confirm its location either by front-to-back counting of the spark plug wells or by checking valve-cover markings and the coil layout, with official diagrams as a final reference.