Nissan RD28T

Nissan RD28 TurboThe Nissan RD28T is a 2.8 l (2,826 cc, 172.44 cu-in) straight six, water-cooled turbo-charged diesel engine from Nissan RD-family, manufactured by the Nissan Motor Company since 1987 to 1997.

The RD28T has a cast-iron cylinder block, an aluminum cylinder head with SOCH (Single overhead camshaft) and two valves per cylinder and Garrett GT17 turbocharger. The Nissan RD28T compression ratio is 21.2:1. Cylinder bore and piston stroke are 85.0 mm (3.35 in) and 88.0 mm (3.27 in), respectively.

The Nissan RD28T with turbo-charger produced 115 PS (85 kW, 114 HP) at 4,000 rpm or 125 PS (92 kW, 123 HP) at 4,400 rpm of horsepower and 235 Nm (23.9 kg⋅m, 173.3 lb⋅ft) at 2,400 rpm or 255 Nm (26.0 kg⋅m, 188.0 lb⋅ft) at 2,400 rpm of torque.

The breakdown of the engine code is as follows:

  • RD – Engine Family
  • 28 – 2.8 Liter Displacement
  • T – Turbocharged

General information

Engine Specifications
Engine codeRD28T
LayoutStraight-6, vertical
Fuel typeDiesel
Production1987-1997
Displacement2.8 L, 2,826 cc (172.44 cu in)
Injection pumpZexel (VE-type)
Power adderTurbocharger Garrett GT17
Horsepower 115 PS (85 kW, 114 HP) at 4,000 rpm
125 PS (92 kW, 123 HP) at 4,400 rpm
Torque output 235 N⋅m (23.9 kg⋅m, 173.3 lb⋅ft) at 2,400 rpm
255 N⋅m (26.0 kg⋅m, 188.0 lb⋅ft) at 2,400 rpm
Injection order1-5-3-6-2-4
Dimensions (L x H x W):
Weight

Cylinder block

The RD28T cylinder block has a monoblock high-strength cast iron structure and seven-bearing-support system. The engine has a drop-forged steel crankshaft with balance weights. The RD28T turbodiesel motor has two compression and single oil control ring. The cylinder bore is 85.0 mm (3.35 in), piston stroke is 88.0 mm (3.27 in) and compression ratio rating is 21.2:1.

Cylinder block
Cylinder block alloyCast iron
Compression ratio:21.2:1
Cylinder bore:85.0 mm (3.35 in)
Piston stroke:88.0 mm (3.27 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:7
Block Height:
Cylinder liner inner diameter:85.000-85.010 mm (3.3465-3.3468 in)
Piston skirt diameter84.960-84.970 mm (3.3449-3.3453 in)
Piston ring side clearance:Top0.060-0.093 mm (0.0024-0.0037 in)
Second0.040-0.073 mm (0.0016-0.0029 in)
Piston ring end gap:Top0.12-0.30 mm (0.0047-0.0118 in)
Second0.38-0.53 mm (0.0150-0.209 in)
Piston pin outer diameter26.994-27.000 mm (1.0628-1.0630 in)
Piston pin bore diameter26.991-26.999 mm (1.0626-1.0630 in)
Connecting rod center distance:140.0 mm (5.512 in)
Crankshaft journal diameter:54.967-54.975 mm (2.1641-2.1644 in)
Crankpin diameter:49.968-49.974 mm (1.9672-1.9675 in)

Main bearing cap bolts tightening procedure and torque specs:

  • 69-78 Nm; 7.0-8.0 kg·m; 51-58 ft·lb

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

Connecting rod bearing cup bolt

  • Step 1: 14-16 Nm; 1.4-1.6 kg·m; 10-12 ft·lb
  • Step 2: 37-45 Nm; 3.8-4.6 kg·m; 27-33 ft·lb

Crankshaft pulley bolt

  • 142-152 Nm; 14.5-15.5 kg·m; 105-112 ft·lb

Flywheel fixing bolts

  • 137-157 Nm; 14.0-16.0 kg·m; 101-116 ft·lb

Cylinder head

The RD28T has a one-piece aluminum cylinder head with single overhead camshaft and two valves per cylinder: one intake and exhaust made of special heat-resistant steel. The camshaft is driven by a timing belt from the crankshaft. Intake valves are 39.0 mm (1.54) in diameter, and the exhaust valves are 32.0 mm (1.26 in). The Nissan RD28T motor is equipped with self-adjusting hydraulic tappets.

Cylinder head
Cylinder head alloyAluminum
Valve Arrangement:OHV
Valves:12 (2 valves per cylinder)
Intake valves diameter:39.0-39.2 mm (1.535-1.543 in)
Exhaust valves diameter:32.0-32.2 mm (1.260-1.268 in)
Intake valve timing:224°
Exhaust valve timing:248°
Inlet valves length: 101.53-101.97 mm (3.9972-4.0146 in) – with EGR
102.53-102.97 mm (4.0366-4.0539 in)
Exhaust valves length: 101.38-101.82 mm (3.9913-4.0087 in) – with EGR
102.38-102.82 mm (4.0307-4.0480 in)
Intake valve stem diameter:6.965-6.980 mm (0.2742-0.2748 in)
Exhaust valves stem diameter:6.945-6.960 mm (0.2734-0.2740 in)
Camshaft journal diameter:29.935-29.955 mm (1.1785-1.1793 in)
Inlet cam height:47.65-47.70 mm (1.8760-1.8779 in)
Exhaust cam height:49.15-49.20 mm (1.9350-1.9370 in)

Head tightening procedure and torque specs:
M12 bolt

  • Step 1: 29 Nm; 3.0 kg·m; 22 ft·lb
  • Step 2: 113 Nm; 11.5 kg·m; 83 ft·lb
  • Step 3: Loosen all bolts completely
  • Step 4: 29 Nm; 3.0 kg·m; 22 ft·lb
  • Step 4: 118-127 Nm; 12.0-13.0 kg·m; 87-94 ft·lb or turn all bolts 100-105°

Crankshaft gear bolt

  • 123-132 Nm; 12.5-13.5 kg·m; 90-98 ft·lb

Maintenance data

Oil system
Recommended engine oil10W-30 or 10W-40 (“CDII” or higher)
Engine oil capacity With filter: 6.7 L
Without filter: 6.0 L
Fuel system
Idling600-700 rpm
Max engine speed under no load5000 rpm
Initial injection pressure132.4-140.2 bar; 135-143 kg/cm2

Vehicle applications

ModelYears Produced
Nissan Patrol Y601987-1997
Nissan Safari Y601994-1997
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