Nissan TB42 / TB45 / TB48

Nissan's big petrol straight-six — the 4.2 TB42, 4.5 TB45 and 4.8 TB48 — in the Patrol.

It is an iron-block, unstressed engine designed for a vehicle expected to work far from a dealer, and its reputation follows: simple, tolerant, and thirsty in a way that is design rather than fault.

The TB48DE is the one people modify — twin-cam, 4.8 litres, and widely turbocharged — so a stamped code on a rebuilt Patrol engine may not describe what is inside it.

On a standard engine the recurring items are age: a distributor or coil pack that fails with heat, an idle control valve that carbons up, and inlet gaskets that harden and leak unmetered air.

In many markets the Patrol was sold with the RD28 or ZD30 diesel instead, and those have their own pages here — the badge on the car says nothing about which is fitted.