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. 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 SOHC, 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 and at the same engine speeds. at 4,800 rpm 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 at 4,800 rpm at 2,400 rpm Nissan Cedric / Nissan Gloria Y32 & Y33 series 1993–1999 Nissan Laurel C34 - C35 series 1994–1999 RD28E at 4,800 rpm 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 SOHC turbodiesel at 4,400 rpm at 2,400 rpm Nissan Safari Spirit series Y60 2-door soft-top 1996–1997 Nissan Civilian Bus RD28ETi1 electronically controlled turbodiesel with an intercooler at 4,000 rpm at 2,000 rpm Nissan Safari Spirit series Y61 2-door soft-top 1997–1999 (automatic transmission) RD28ETi2 electronically controlled turbodiesel with an intercooler at 4,000 rpm at 2,000 rpm See also List of Nissan engines References RD Diesel engines by model Straight-six engines