The Nissan SD33T is a 3,298 cc, inline‑six turbo‑diesel engine produced between 1980 and 1986. It features a cast iron block and head, indirect injection via pre — combustion chambers, and a single overhead camshaft (SOHC). Output is modest, typically 85–90 kW (115–122 PS) and 265–280 Nm of torque, prioritising durability and low — end grunt for off — road and utility applications.
Fitted primarily to the 160J Patrol (160 series) and C80 Cabstar, the SD33T was engineered fo…
Production years 1980–1986 predate standardized Euro emissions regulations. Compliance was managed under individual national vehicle standards applicable at time of manufacture.
The Nissan SD33T is a 3,298 cc inline‑six turbocharged diesel engine engineered for off-road vehicles and light trucks (1980-1986). It combines a robust cast iron construction with indirect injection and a single turbocharger to deliver dependable, torque-rich performance. Designed for the emissions standards of its era, it prioritizes longevity and mechanical simplicity over peak output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,298 cc | |
Fuel type | Diesel | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 94.0 mm | |
Power output | 85–90 kW (115–122 PS) | |
Torque | 265–280 Nm @ 2,000 rpm | |
Fuel system | Indirect injection (pre-combustion chamber), mechanical injection pump | |
Emissions standard | Pre-Euro (National standards) | |
Compression ratio | 20.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single, non-intercooled (IHI or similar) | |
Timing system | Gear-driven | |
Oil type | SAE 15W-40 (API CC/CD) | |
Dry weight | 285 kg |
The Nissan SD33T was used across Nissan's 160/C80 platforms with longitudinal mounting. This engine received platform-specific adaptations-different intake manifolds and ancillary layouts for the Patrol versus the Cabstar. All adaptations are documented in OEM technical bulletins.
The SD33T's primary long-term reliability risk is turbocharger failure, with elevated incidence in engines subjected to heavy loads without proper warm-up/cool-down cycles. While not subject to modern failure statistics, Nissan workshop data from the early 1980s noted this as a common wear item. Infrequent maintenance and use of poor-quality oil accelerate bearing wear, making disciplined operating procedures critical.
Analysis derived from Nissan technical bulletins (1980-1986) and historical workshop service data. Repair procedures should follow manufacturer guidelines.
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Yes, the SD33T is renowned for its rugged simplicity and exceptional longevity. Its cast iron construction and mechanical systems are incredibly durable. The main long-term concerns are the turbocharger and fuel injection pump, which are serviceable items. With proper maintenance, disciplined operating procedures (warm-up/cool-down), and timely repairs, these engines can easily surpass 400,000 km.
The most frequent issues are failure of the turbocharger (causing oil leaks and power loss), failure of the mechanical fuel injection pump (causing hard starting/power loss), failure of glow plugs or their relay (causing cold start issues), and leaks in the radiator or cooling system hoses (leading to overheating).
The SD33T was primarily used in the 160 series Nissan Patrol (1980-1986) and the C80 series Nissan Cabstar (1982-1986). It was the turbocharged diesel option for these rugged utility and off-road vehicles.
Significant power gains are possible but require careful modification. Adjusting the injection pump timing and fuel delivery, installing a larger turbocharger, and adding an intercooler can yield substantial improvements. However, this increases stress on engine components and requires supporting upgrades to the cooling and fuel systems.
Fuel economy is moderate for its size and era. Expect around 10.0–12.0 L/100km (24–28 mpg UK) in mixed driving for a Patrol, depending heavily on the vehicle's weight, condition, driving style, and terrain. Its large displacement and turbocharging impact efficiency, but it offers strong torque for towing and off-road use.
No. The Nissan SD33T is generally considered a non-interference (or 'free-wheeling') engine. If the timing gears fail (which is extremely rare), the pistons will not contact the valves, preventing catastrophic internal damage, though the engine will stop running.
Nissan originally specified SAE 15W-40 diesel engine oil meeting API CC/CD standards. A good quality 15W-40 meeting modern API CK-4 specifications is highly recommended for better protection against soot and wear, especially for the turbocharger. Regular oil and filter changes (every 5,000–7,000 km) are crucial for longevity.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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