Nissan BD30

Nissan BD30The Nissan BD30 is a 3.0 l (2,953 cc, 180.2 cu·in) straight-four, water-cooled naturally aspirated diesel engine from Nissan BD family. The engine was used on Nissan trucks from 1990 to 1995

The Nissan BD30 has a cast-iron cylinder block, a cylinder head with OHV (overhead valves with single camshaft), two valves per cylinder (8 in total) and a direct fuel injection system.

The cylinder bore is 96.0 mm (3.78 in) and the piston stroke is 103.0 mm (4.06 in). This engine produced 100 PS (74 kW; 99 HP) at 3,800 rpm of horsepower and 216 N·m (22 kg·m, 159.2 ft·lb) at 2,000 rpm of torque.

The breakdown of the engine code is as follows:

  • BD – Engine Family
  • 30 – 3.0 Liter Displacement

General information

Engine Specifications
Engine codeBD30
LayoutStraight-4, vertical
Fuel typeDiesel
Production1990-1995
Displacement3.0L, 1,974 cc (120.45 cu in)
Fuel systemDirect injection system
Power addernone
Max. Horsepower100 PS (74 kW; 99 HP) at 3,800 rpm
Torque output216 N·m (22 kg·m, 159.2 ft·lb) at 2,000 rpm
Firing order1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The Nissan BD30 motor has a cast-iron cylinder block with a five-bearings supported system and an aluminum alloy piston for high strength, lightweight and good heat conductivity; two compression and one oil control rings. The cylinder bore is 96.0 mm (3.78 in), piston stroke is 103.0 mm (4.06 in).

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:
Cylinder bore:96.0 mm (3.78 in)
Piston stroke:103.0 mm (4.06 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter:96.025-96.070 mm (3.7805-3.7823 in)
Piston skirt diameter95.950-95.960 mm (3.7776-3.7779 in)
Piston ring side clearance:Top0.060-0.100 mm (0.0024-0.0039 in)
Second0.040-0.080 mm (0.0016-0.0031 in)
Oil0.020-0.060 mm (0.0008-0.0024 in)
Piston ring end gap:Top0.300-0.450 mm (0.0118-0.0177 in)
Second0.200-0.350 mm (0.0079-0.0138 in)
Oil0.150-0.350 mm (0.0059-0.0138 in)
Piston pin outer diameter29.993-30.000 mm (1.1808-1.1811 in)
Connecting rod center distance156.975-157.025 mm (6.1801-6.1821 in)
Crankshaft main journal diameter:70.907-70.920 mm (2.7916-2.7921 in)
Crankpin diameter:56.913-56.926 mm (2.2407-2.2412 in)
Crankshaft center distance:51.5 mm (2.03 in)

Main bearing cap bolts tightening procedure and torque specs:

  • 167-177 Nm; 17.0-18.0 kg·m; 123-130 ft·lb

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing nut

  • 78-83 Nm; 8.0-8.5 kg·m; 58-61 ft·lb

Crankshaft pulley

  • 294-324 Nm; 30.0-33.0 kg·m; 217-239 ft·lb

Flywheel fixing bolts

  • 147-167 Nm; 15.0-17.0 kg·m; 108-123 ft·lb

Cylinder head

The engine has OHV design with a single camshaft and two valves per cylinder (8 valves in total). Intake valves are 43.5 mm (1.71 in) in diameter, and the exhaust valves are 38.0 mm (1.50 in).

Cylinder head
Valve Arrangement:OHV
Valves:8 (2 valves per cylinder)
Valve head diameter:INTAKE43.4-43.6 mm (1.7087-1.7165 in))
EXHAUST37.9-38.1 mm (1.4921-1.5 in)
Valve length:INTAKE117.0 mm (4.6063 in)
EXHAUST117.0 mm (4.6063 in)
Valve stem diameter:INTAKE7.962-7.977 mm (0.3135-0.3141 in)
EXHAUST7.945-7.960 mm (0.3128-0.3134 in)
Valve spring free length:INTAKE53.4 mm (2.1024 in)
EXHAUST53.4 mm (2.1024 in)
Camshaft cam height:INTAKE41.733 mm (1.643 in)
EXHAUST41.900 mm (1.6496 in)

Maintenance data

Valve clearance (HOT)
Intake valve0.35 mm (0.0138 in)
Exhaust valve0.35 mm (0.0138 in)
Compression pressure
Standard30 kg/cm2 (29.4 bar, 426 psi) / 200 rpm
Minimun25 kg/cm2 (24.5 bar, 356 psi) / 200 rpm
Compression differential limit between cylinders3 kg/cm2 (2.9 bar, 42 psi) / 200 rpm
Oil system
Recommended engine oilAPI CC or CD
SAE Viscosity Number For cold and warm areas: 10W-30
For hot areas: 20W-40 and 20W-50
Engine oil capacity With oil filter: 8.1 l
Without oil filter: 7.4 l

Vehicle applications

ModelYears Produced
Nissan Atlas (H40)
Nissan Atlas (H41)1995
BMC Levend
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