Nissan ZD engine
The Nissan ZD30 engine family is a 3.0-litre (2,953 cc) inline-four cylinder diesel engine with a bore and stroke of 96 mm × 102 mm (3.78 in × 4.02 in), that replaced the Nissan QD, BD and TD engines. At Renault it also replaced the Sofim 8140 engine and is the only truck diesel engine which remained with Nissan Motors when they sold Nissan Diesel to Volvo trucks in 2007.
| Nissan ZD engine | |
|---|---|
| Overview | |
| Manufacturer | Nissan Motors |
| Production | 1999-present |
| Layout | |
| Configuration | Inline-4 |
| Valvetrain | DOHC 4 valves x cyl. |
| Combustion | |
| Turbocharger | on all but DD-engines |
| Fuel system | Direct injection |
| Management | Drive by wire |
| Fuel type | Diesel |
| Cooling system | Water-cooled |
| Output | |
| Power output | 77–130 kW (103–174 hp) |
| Torque output | 209–540 N⋅m (154–398 lbf⋅ft) |
It features a cast-iron crank case, which is horizontally divided in the crank shaft plane into a lower and an upper part. A set of gear driven balance shafts is located slightly higher than the crankshaft, the vacuum pump is placed on the gear cover and driven by the RH (intake side) balance shaft. The Gerotor oil pump is also located on the front side of the crankshaft. A Serpentine belt with hydraulic tensioner powers the a/c compressor, the water pump and (via a freewheeling pulley to reduce squeaking when engine decelerates) the alternator. A Dual-mass flywheel may be used with manual transmissions.
The aluminium-alloy Crossflow cylinder head houses two camshafts (DOHC) driven by a combined gear and chain drive operating 4 valves per cylinder (16 in total) by bucket tappets. Exhaust is on the LH side which makes an “exhaust forward” arrangement when the engine is installed transversally. Even the first series of “mechanical” engines have an ECU with Electronic throttle control (Drive by wire), MAF sensor (not for all engines with 96 kW and below), advanced lube oil monitoring etc. Turbocharged and intercooled engines have Swirl flaps incorporated into the intake manifold to improve combustion at low revs.
The original versions of this engine were introduced in 1999 (MY 2000) utilizing a VP44 distributor injection pump and represent the transition from the former naturally aspirated all mechanical ohv engines with swirl combustion chamber (except the truck engine BD30 with direct injection) to the later 2nd generation common rail DOHC design. The ECU's functionality has been improved during the life time of this first generation and with the introduction of the later Common Rail engines.