The Nissan SD33 is a 3,246 cc, inline‑six naturally aspirated diesel engine produced between 1980 and 1986. It features a SOHC 12‑valve design with indirect injection and a cast — iron block, delivering outputs of 63 kW (85 PS) and 188 Nm. Its robust, simple architecture provided dependable torque for Nissan's utility vehicles and light trucks.
Fitted to models such as the Patrol 160 and Safari, the SD33 was engineered for rugged reliability and ease of maintenance in deman…
Production years 1980–1986 meet applicable Japanese and Australian emissions standards for respective markets (JIS D 1001, ADR 27A).
The Nissan SD33 is a 3,246 cc inline‑six naturally aspirated diesel engine engineered for utility vehicles and light trucks (1980-1986). It combines indirect fuel injection with a durable SOHC valvetrain to deliver strong, low-RPM torque and exceptional mechanical reliability. Designed to meet period-specific Japanese and Australian standards, it prioritizes durability over emissions sophistication.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,246 cc | |
Fuel type | Diesel | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 93.0 mm | |
Power output | 63 kW (85 PS) @ 4,000 rpm | |
Torque | 188 Nm @ 2,400 rpm | |
Fuel system | Indirect injection (mechanical rotary pump) | |
Emissions standard | JIS D 1001 / ADR 27A | |
Compression ratio | 21.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Gear-driven | |
Oil type | Nissan 15W-40 (API CC/CD) | |
Dry weight | 245 kg |
The Nissan SD33 was used across Nissan's 160 platform with longitudinal mounting and was not licensed to other manufacturers. This engine received platform-specific adaptations-reinforced engine mounts in the Patrol and revised cooling systems in the Safari-and from 1983 the facelifted Patrol models adopted a revised injection pump drive gear, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The SD33's primary reliability risk is mechanical fuel injection pump drive gear wear, with elevated incidence in vehicles subjected to heavy towing or off-road use. Nissan TSB NTB82-018 documents this concern, while general owner feedback indicates glow plug failures and coolant leaks are also common. Neglecting scheduled oil changes can accelerate internal wear, making adherence to the maintenance schedule critical.
Analysis derived from Nissan technical bulletins (1980-1986) and owner-reported failure data. Repair procedures should follow manufacturer guidelines.
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The SD33 is renowned for its exceptional long-term reliability and durability, thanks to its simple SOHC design and robust cast-iron construction. Its main weakness is the injection pump drive gear under heavy load. With regular oil changes and timely gear replacement, it can easily exceed 400,000 km. Its non-interference design also provides a safety net against timing gear failure.
The most frequent issues are injection pump drive gear wear (causing running problems), glow plug failures (causing cold-start difficulties), and coolant leaks from the water pump. Rear main seal oil leaks are also common as the engine ages. These are well-documented in Nissan service information.
The SD33 engine was used in the Nissan Patrol 160 (1980-1986) and the Nissan Safari Y60 (1980-1983). It was the naturally aspirated diesel option, offering rugged simplicity compared to the turbocharged SD33T.
Modest power gains are possible. As a mechanically injected engine, it responds well to injection pump calibration adjustments and performance nozzles. More significant gains require adding a turbocharger (converting it to SD33T specs), which is a complex but well-documented modification for enthusiasts.
Moderate for its size and era. Official figures for the Nissan Patrol are around 12.5 L/100km (23 mpg UK). Real-world driving, especially off-road or while towing, typically yields 14.0-16.0 L/100km (18-20 mpg UK), reflecting its large displacement and focus on torque over economy.
No. The SD33 is a non-interference engine. If the timing gears were to fail or jump, the pistons would not collide with the valves. This design provides a significant safety margin against catastrophic engine damage.
Nissan originally specified a 15W-40 viscosity grade diesel engine oil meeting API CC or CD standards. Modern equivalents meeting API CK-4 or higher are also suitable and recommended. Change intervals should not exceed 10,000 km or 6 months.
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