Nissan RD28

Nissan RD28The Nissan RD28 is a 2.8 l (2,826 cc, 172.44 cu-in) straight six, water-cooled naturally aspirated diesel engine from Nissan RD-family, manufactured by the Nissan Motor Company since 1985 to 1999.

The RD28 has a cast-iron cylinder block, an aluminum cylinder head with SOHC (Single overhead camshaft) and two valves per cylinder. The Nissan RD28 compression ratio is 21.2:1. Cylinder bore and piston stroke are 85.0 mm (3.35 in) and 83.0 mm (3.27 in), respectively.

The early engine versions produced 94 PS (69 kW, 93 HP) at 4,800 rpm and 177 Nm (18.0 kg·m; 130.6 ft·lb) at 2,400 rpm; the later versions produced 100 PS (73 kW; 98 HP) at 4,800 rpm of horsepower and 178 Nm (18.2 kg·m; 131.2 ft·lb) at 2,400 rpm or of torque.

The breakdown of the engine code is as follows:

  • RD – Engine Family
  • 28 – 2.8 Liter Displacement

General information

Engine Specifications
Engine codeRD28
LayoutStraight-6, vertical
Fuel typeDiesel
Displacement2.8 L, 2,826 cc (172.44 cu in)
Injection pumpZexel (VE-type)
Power adderNone
Horsepower 94 PS (69 kW, 93 HP) at 4,800 rpm
100 PS (73 kW; 99 HP) at 4,800 rpm
Torque output 177 Nm (18.0 kg·m; 130.6 ft·lb) at 2,400 rpm
178 Nm (18.2 kg·m; 131.2 ft·lb) at 2,400 rpm
Injection order1-5-3-6-2-4
Dimensions (L x H x W):

Cylinder block

The RD28 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 RD28 motor has two compression and single oil control ring. The cylinder bore is 85.0 mm (3.35 in), piston stroke is 83.0 mm (3.27 in) and compression ratio rating is 21.2:1. The connecting rod’s length is 140.0 mm (5.512 in), the crankshaft journal diameter is 54.0 mm (2.13 in) and crankpin diameter is 50.0 mm (1.97 in).

Cylinder block
Cylinder block alloyCast iron
Compression ratio:21.2:1
Cylinder bore:85.0 mm (3.35 in)
Piston stroke:83.0 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 RD28 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 early Nissan RD28 engines were equipped with valve shims for adjusting the valve clearance, the later versions used self-adjusting hydraulic tappets.

Cylinder head
Cylinder head alloyAluminum
Valve Arrangement:SOHC
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:232°
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:48.70-48.75 mm (1.9173-1.9193 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

Compression pressure
Standard31 kg/m2 (30.4 bar) / 200 rpm
Minimun25 kg/m2 (24.5 bar) / 200 rpm
Compression differential limit between cylinders5 kg/m2 (4.9 bar) / 200 rpm
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 Skyline R311985–1987
Nissan Laurel C32-C341986–1993
Nissan Cedric Y30-Y321985–1993
Nissan Gloria Y30-Y321985–1993
Nissan Cedric Y30 (commercial, taxi)1987–1999
Nissan Gloria Y30 (commercial, taxi)1987–1999
Nissan Crew K301993–1999
Nissan Cedric Y32-Y331993–1999
Nissan Gloria Y32-Y331993–1999
Nissan Laurel C34-C351994–1999
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.


  1. Please inform me what’s the tappit valve clearance of my Nissan president 1985 Y44(S). I want to adjust it as factory recommended but not getting help.

  2. HI,
    Can you please specify what kind of engine RD28086324A is. I tried to find online what exactly the letters and numbers mean but to avail.


  3. Hi, wat is the glowplugs sequence on the RD28? I took out 4 pz 30 and 2 PM 164. Cant remember were it came out, and is it a big problem if it doesn6go back as required?

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