The 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 code | BD30 |
| Layout | Straight-4, vertical |
| Fuel type | Diesel |
| Production | 1990-1995 |
| Displacement | 3.0L, 1,974 cc (120.45 cu in) |
| Fuel system | Direct injection system |
| Power adder | none |
| Max. Horsepower | 100 PS (74 kW; 99 HP) at 3,800 rpm |
| Torque output | 216 N·m (22 kg·m, 159.2 ft·lb) at 2,000 rpm |
| Firing order | 1-3-4-2 |
| 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 alloy | Cast-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 diameter | 95.950-95.960 mm (3.7776-3.7779 in) | |
| Piston ring side clearance: | Top | 0.060-0.100 mm (0.0024-0.0039 in) |
| Second | 0.040-0.080 mm (0.0016-0.0031 in) | |
| Oil | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Piston ring end gap: | Top | 0.300-0.450 mm (0.0118-0.0177 in) |
| Second | 0.200-0.350 mm (0.0079-0.0138 in) | |
| Oil | 0.150-0.350 mm (0.0059-0.0138 in) | |
| Piston pin outer diameter | 29.993-30.000 mm (1.1808-1.1811 in) | |
| Connecting rod center distance | 156.975-157.025 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: | INTAKE | 43.4-43.6 mm (1.7087-1.7165 in)) |
| EXHAUST | 37.9-38.1 mm (1.4921-1.5 in) | |
| Valve length: | INTAKE | 117.0 mm (4.6063 in) |
| EXHAUST | 117.0 mm (4.6063 in) | |
| Valve stem diameter: | INTAKE | 7.962-7.977 mm (0.3135-0.3141 in) |
| EXHAUST | 7.945-7.960 mm (0.3128-0.3134 in) | |
| Valve spring free length: | INTAKE | 53.4 mm (2.1024 in) |
| EXHAUST | 53.4 mm (2.1024 in) | |
| Camshaft cam height: | INTAKE | 41.733 mm (1.643 in) |
| EXHAUST | 41.900 mm (1.6496 in) | |
Maintenance data
| Valve clearance (HOT) | |
| Intake valve | 0.35 mm (0.0138 in) |
| Exhaust valve | 0.35 mm (0.0138 in) |
| Compression pressure | |
| Standard | 30 kg/cm2 (29.4 bar, 426 psi) / 200 rpm |
| Minimun | 25 kg/cm2 (24.5 bar, 356 psi) / 200 rpm |
| Compression differential limit between cylinders | 3 kg/cm2 (2.9 bar, 42 psi) / 200 rpm |
| Oil system | |
| Recommended engine oil | API 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
| Model | Years Produced |
| Nissan Atlas (H40) | – |
| Nissan Atlas (H41) | 1995 |
| BMC Levend | – |
Author:
Looking for a BD30 engine rebuild kit
What are the torque settings for the head bolts.
Td27ti. follow the procedure