Also known as: td27, td27t, td25, td42, qd32, qd323, zd30, zd30ddti, nissan truck diesel, td23, bd25, bd30, td27eti, qd32eti
Nissan's commercial diesels — the TD27, QD32 and ZD30 — in the Navara, Terrano, Patrol and Urvan.
The TD and QD are indirect-injection with mechanical pumps and have the durability that implies: slow, unstressed, and repairable far from a dealer. The ZD30 is direct-injection and is a different engine to diagnose despite sitting in the same vehicles.
⚑ The ZD30's reputation is the thing to know. In its earlier electronically-controlled form it has a well-documented pattern of melted or holed pistons, and the accepted causes are boost and fuelling drifting out of specification — a sticking variable-geometry turbocharger, a blocked intercooler, or an EGR left to carbon up. On a Patrol or Navara with one, boost and exhaust temperature are not routine checks.
On the TD and QD the recurring items are old-diesel wear: glow plugs, injection pump timing that drifts with the belt, and injector nozzles that carbon up and knock at idle.
The YD25 that succeeded them is common-rail and has its own page here.
Cars fitted with this engine
5 generations, across 1 make. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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