Nissan FD46

Nissan FD46The Nissan FD46 is a 4.6 l (4,617 cc, 281.75 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 FD46 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.

A 108.0 mm (4.25 in) cylinder bore and 126.0 mm (4.96 in) piston stroke give the FD46 engine a total of 4617 cc of displacement. The compression ratio rating is 18.0:1. This engine produced 135 PS (99 kW; 133 HP) at 3,000 rpm of horsepower and 329 N·m (33.5 kg·m, 242.5 ft·lb) at 1,800 rpm of torque.

The breakdown of the engine code is as follows:

  • FD – Engine Family
  • 46 – 4.6 Liter Displacement

General information

Engine Specifications
Engine codeFD46
LayoutStraight-4, vertical
Fuel typeDiesel
Production1991-1995
Displacement4.6 L, 4,617 cc (281.75 cu in)
Fuel systemDirect injection system
Power addernone
Max. Horsepower135 PS (99 kW; 133 HP) at 3,000 rpm
Torque output329 N·m (33.5 kg·m, 242.5 ft·lb) at 1,800 rpm
Firing order1-3-4-2
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 126.0 mm (4.96 in). The compression ratio rating is 18.0:1.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:18.0:1
Cylinder bore:108.0 mm (4.25 in)
Piston stroke:126.0 mm (4.96 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 diameter107.920-107.930 mm (4.2488-4.2492 in)
Piston ring side clearance:Top0.070-0.110 mm (0.0028-0.0043 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)
Second0.300-0.450 mm (0.0118-0.0177 in)
Oil0.250-0.450 mm (0.0098-0.0177 in)
Piston pin outer diameter35.993-36.000 mm (1.417-1.4173 in)
Connecting rod center distance178.775-178.825 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:63.0 mm (2.48 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:INTAKE48.4-48.6 mm (1.9055-1.9134 in)
EXHAUST39.4-39.6 mm (1.5512-1.5591 in)
Valve length:INTAKE128.65-129.25 mm (5.065-5.0886 in)
EXHAUST129.70-130.30 mm (5.1063-5.1299 in)
Valve stem diameter:INTAKE8.970-8.985 mm (0.3531-0.3537 in)
EXHAUST8.935-8.950 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:INTAKE47.005-47.025 mm (1.8506-1.8514 in)
EXHAUST47.005-47.025 mm (1.8506-1.8514 in)

Maintenance data

Valve clearance (HOT)
Intake valve0.40 mm (0.0157 in)
Exhaust valve0.40 mm (0.0157 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: 9.6 l
Without oil filter: 8.3 l

Vehicle applications

ModelYears Produced
Nissan Atlas (H41)1991-1995
Nissan Condor (S41)1991-1995
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