Nissan FD42

Nissan FD42The Nissan FD42 is a 4.2 l (4,212 cc, 257.03 cu·in) straight-four, water-cooled naturally aspirated diesel engine from Nissan FD family. The engine was manufactured by UD Trucks (Nissan Diesel) from 1991 to 1995.

The Nissan FD42 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 108.0 mm (4.25 in) and the piston stroke is 115.0 mm (4.53 in), and the compression ratio rating is 18.0:1. The Nissan FD42 engine produced 125 PS (92 kW; 123 HP) at 3,200 rpm of maximum output power and 299 N·m (30.5 kg·m, 220.4 ft·lb) at 2,000 rpm of peak torque.

The breakdown of the engine code is as follows:

  • FD – Engine Family
  • 42 – 4.2 Liter Displacement

General information

Engine Specifications
Engine code FD42
Layout Straight-4, vertical
Fuel type Diesel
Production 1991-1995
Displacement 4.2 L, 4,212 cc (257.03 cu in)
Fuel system Direct injection system
Power adder none
Max. Horsepower 125 PS (92 kW; 123 HP) at 3,200 rpm
Torque output 299 N·m (30.5 kg·m, 220.4 ft·lb) at 2,000 rpm
Firing order 1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The Nissan FD42 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 108.0 mm (4.25 in), piston stroke is 115.0 mm (4.53 in). The compression ratio rating is 18.0:1.

Cylinder block
Cylinder block alloy Cast-iron
Compression ratio: 18.0:1
Cylinder bore: 108.0 mm (4.25 in)
Piston stroke: 115.0 mm (4.53 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 5
Cylinder inner diameter: 108.020-108.050 mm (4.2527-4.2539 in)
Piston skirt diameter 107.920-107.930 mm (4.2488-4.2492 in)
Piston ring side clearance: Top 0.070-0.110 mm (0.0028-0.0043 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 0.300-0.450 mm (0.0118-0.0177 in)
Oil 0.250-0.450 mm (0.0098-0.0177 in)
Piston pin outer diameter 35.993-36.000 mm (1.417-1.4173 in)
Connecting rod center distance 178.775-178.825 mm (7.0384-7.0403 in)
Crankshaft main journal diameter: 77.920-77.940 mm (3.0677-3.0685 in)
Crankpin diameter: 64.925-64.945 mm (2.5561-2.5569 in)
Crankshaft center distance: 57.5 mm (2.265 in)

Connecting rod bearing nut

  • 113-118 Nm; 11.5-12.0 kg·m; 83-87 ft·lb

Crankshaft pulley

  • 490-539 Nm; 50-55 kg·m; 362-389 ft·lb

Flywheel fixing bolts

  • 265-284 Nm; 27-29 kg·m; 195-210 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 48.5 mm (1.91 in) in diameter, and the exhaust valves are 39.5 mm (1.55 in).

Cylinder head
Valve Arrangement: OHV
Valves: 8 (2 valves per cylinder)
Valve head diameter: INTAKE 48.4-48.6 mm (1.9055-1.9134 in)
EXHAUST 39.4-39.6 mm (1.5512-1.5591 in)
Valve length: INTAKE 128.65-129.25 mm (5.065-5.0886 in)
EXHAUST 129.70-130.30 mm (5.1063-5.1299 in)
Valve stem diameter: INTAKE 8.970-8.985 mm (0.3531-0.3537 in)
EXHAUST 8.935-8.950 mm (0.3518-0.3524 in)
Valve spring free length: INTAKE Inner: 58.9 mm (2.3189 in)
Outer: 59.5 mm (2.3425 in)
EXHAUST Inner: 58.9 mm (2.3189 in)
Outer: 59.5 mm (2.3425 in)
Camshaft cam height: INTAKE 47.005-47.025 mm (1.8506-1.8514 in)
EXHAUST 47.005-47.025 mm (1.8506-1.8514 in)

Maintenance data

Valve clearance (HOT)
Intake valve 0.40 mm (0.0157 in)
Exhaust valve 0.40 mm (0.0157 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: 9.6 l
Without oil filter: 8.3 l

Vehicle applications

Model Years Produced
Nissan Atlas (H41) 1991-1995
Nissan Condor (S41) 1991-1995
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