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 for rugged, reliable performance in demanding conditions. Emissions compliance for its production period was met through mechanical fuel injection and basic exhaust aftertreatment, aligning with prevailing national standards of the early 1980s.
One documented concern is premature failure of the turbocharger, particularly in high-mileage or poorly maintained examples, which can lead to oil leaks and reduced boost. This issue, referenced in Nissan service documentation for the 160J platform, is often attributed to inadequate oil supply or contamination causing bearing wear.
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 SOHC design offers exceptional mechanical simplicity and durability, ideal for off-road use. The gear-driven timing system is virtually indestructible but produces more noise than a chain. The non-intercooled turbo provides a modest power boost but requires careful warm-up and cool-down cycles to prevent premature bearing failure. Using the correct high-detergent diesel oil is critical for protecting the turbo and injection pump.
Oil Specs: Requires SAE 15W-40 specification meeting API CC/CD (Nissan SM-SD33). Modern API CK-4 equivalents are recommended for improved protection.
Emissions: Pre-dates Euro standards; certified under national regulations (e.g., Japanese 1980 Emissions Law, UK pre-1992 standards).
Power Ratings: Measured under JIS D 1001 or DIN 70020 standards depending on market (Nissan Global Product Data 1983).
Nissan Service Manual (SM-SD33)
Nissan Technical Bulletin (TB-81-003)
Nissan EPC (SD33T)
EU Regulation (EC) No 715/2007 (for historical emissions context)
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.
Locate the engine code stamped on the flat machined surface on the left side of the cylinder block, near the front engine mount (Nissan SM-SD33). The 8th VIN digit often corresponds to the engine type for Nissan vehicles of this era. Visually, the SD33T can be identified by its long inline-six configuration, prominent mechanical fuel injection pump, and the turbocharger mounted at the rear of the engine. Differentiate from the naturally aspirated SD33 by the presence of the turbocharger and associated plumbing. Service parts are generally consistent across applications but verify part numbers against the specific chassis code (160, C80) as ancillary components may differ.
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.
Find answers to most commonly asked questions about NISSAN SD33T.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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