The Nissan RD28 is a 2,826 cc, inline‑six naturally aspirated diesel engine produced between 1988 and 1999. It features a cast iron block and head, indirect injection, and a single overhead camshaft (SOHC) valvetrain. This robust engine was designed for durability and high torque output in Nissan's commercial and off — road vehicles.
Fitted to models such as the Patrol (Y60/Y61), Navara (D21), and Caravan (E24/E25), the RD28 was engineered for reliable performance unde…
Production years 1988–1999 meet applicable Japanese emissions standards for their respective model years (Nissan Technical Bulletin NTB-90-015).
The Nissan RD28 is a 2,826 cc inline‑six naturally aspirated diesel engine engineered for SUVs, trucks, and vans (1988-1999). It combines a robust cast iron construction with indirect injection and SOHC valvetrain to deliver reliable, high-torque performance. Designed to meet emissions standards of its era, it prioritizes durability and serviceability for demanding applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,826 cc | |
Fuel type | Diesel | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 81.0 mm | |
Power output | 70–75 kW (95–102 PS) | |
Torque | 206–217 Nm @ 2,200 rpm | |
Fuel system | Indirect injection, mechanical rotary pump | |
Emissions standard | Japanese 1990s standards | |
Compression ratio | 21.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 15W-40 (API CD/CE) | |
Dry weight | 265 kg |
The Nissan RD28 was used across Nissan's Y60/Y61, D21, and E24/E25 platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts for the Patrol and different accessory brackets for the Caravan-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
The RD28's primary reliability risk is cylinder head gasket failure, with elevated incidence in pre-1993 models or vehicles subjected to overheating. Nissan service data indicates head gasket repairs are common on early builds, while owner reports frequently cite injector pump issues. Vehicles used for towing or in hot climates make cooling system maintenance critical.
Analysis derived from Nissan technical bulletins (1988-1999) and owner workshop manual data. Repair procedures should follow manufacturer guidelines.
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The RD28 is renowned for its exceptional mechanical durability and long-term reliability when properly maintained. Its simple, overbuilt design allows it to handle high mileage with ease. With regular oil changes, timely cooling system maintenance, and addressing the head gasket issue on early models, these engines can easily surpass 400,000 km. It's a favorite for off-road and commercial use due to its robustness.
The most frequent issues are cylinder head gasket failure (especially on pre-1993 models), wear in the mechanical fuel injection pump, glow plug system failures causing hard cold starts, and coolant leaks from aging hoses or the radiator. These are well-documented and relatively straightforward to fix with OEM parts.
The RD28 was used in the legendary Nissan Patrol (Y60/Y61), the rugged Navara/Pickup (D21), and the Caravan/Urvan van (E24/E25) during the late 1980s and 1990s. It was the go-to diesel engine for those needing torque and reliability in SUVs, trucks, and commercial vans.
Yes, the RD28 responds well to tuning. Common upgrades include adjusting the mechanical injection pump for more fuel delivery, installing a performance exhaust, and adding a turbocharger (converting it to an RD28T). Significant power gains are possible, and its robust bottom end can handle the increased stress. Many owners successfully turbocharge their naturally aspirated RD28 engines.
Fuel economy is moderate for a large diesel. Expect around 10.0-12.0 L/100km (24-28 mpg UK) in mixed driving for a Patrol. The lighter Navara pickup will be slightly more economical, around 9.0-11.0 L/100km (26-31 mpg UK). Fuel consumption will increase significantly when towing or off-roading.
No. The RD28 is a non-interference engine. If the timing chain were to fail or jump, the pistons will not contact the valves. This means a timing failure will cause the engine to stop running but will not result in catastrophic internal damage, making it very forgiving for a high-compression diesel.
Nissan originally specified SAE 15W-40 oil meeting API CD/CE standards. A good quality 15W-40 diesel engine oil meeting API CK-4 or CI-4 specifications is highly recommended today. This provides the necessary detergents and anti-wear additives for high-compression diesel engines.
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