Nissan RD engine

The Nissan RD engine series is basically a Nissan RB engine design, except that it is only a single overhead cam six-cylinder diesel engine. It was the successor to the Nissan LD and SD six-cylinder engines and was joined by the six-cylinder Nissan TD engine.

From 1997 onwards the turbocharged versions were fitted with electronic fuel injection. The turbodiesel version known as the RD28T (or RD28ET with electronic fuel injection) and were also fitted to the Nissan Safari (also known as the Nissan Patrol) off-road vehicle.

Since the Nissan RD engine is based on the Nissan RB engine, they have many similarities and many parts are interchangeable. The engine block was similar to the RB30 engine except it had more material, was heavier and had 85mm bore vs the 86mm bore of the RB30 and a 83mm stroke vs 85mm stroke. One issue is that the stronger vibrations from the diesel engine can loosen the crank/harmonic balancer bolt (originally from the RB engines) and in turn become loose or fall off causing major engine damage. It is recommended to use thread locking fluid when installing.

The cylinder head was of a non-crossflow design, meaning that the exhaust and intake ports were on one side of the cylinder head.

RD28

 * 2826 cc SOHC, 85 mm bore

RD28 Series 1

 * 12 valves (two per cylinder). When originally introduced, JIS gross were used rather than JIS net, meaning that early information claims 100 PS and 18.5 kgm at the same engine speeds.

94 PS at 4,800 rpm 18 kgm at 2,400 rpm


 * Nissan Skyline R31 series 1985–1987
 * Nissan Laurel C32 ~ C34 series 1986–1993
 * Nissan Cedric / Nissan Gloria Y30 ~ Y32 series 1985–1993
 * Commercial (taxi) Nissan Cedric / Nissan Gloria Y31 series sedan 1987–1999
 * Nissan Crew K30 series 1993–1999
 * Nissan Cefiro A31 series 1988–1993

No PCV on the tappet cover.

RD28 Series 2
100 PS at 4,800 rpm 18.2 kgm at 2,400 rpm


 * Nissan Cedric / Nissan Gloria Y32 & Y33 series 1993–1999
 * Nissan Laurel C34 - C35 series 1994–1999

RD28E
100 PS at 4,800 rpm 18.2 kgm at 2,400 rpm


 * Commercial (taxi) Nissan Cedric Y31 series sedan 1999.08-2002
 * Nissan Laurel C35 series 1999–2001
 * Nissan Crew K30 series 1999-2009

Vacuum pump located on tappet cover.

RD28T
125 PS at 4,400 rpm 26 kgm at 2,400 rpm
 * 2826 cc SOHC turbodiesel

Nissan Safari Spirit series Y60 2-door soft-top 1996–1997

Nissan Civilian Bus

RD28ETi1
135 PS at 4,000 rpm 29.3 kgm at 2,000 rpm
 * Electronically controlled turbodiesel with an intercooler

Nissan Safari Spirit series Y61 2-door soft-top 1997–1999 (automatic transmission)

RD28ETi2
145 PS at 4,000 rpm 26.6 kgm at 2,000 rpm
 * Electronically controlled turbodiesel with an intercooler