Nissan TD25

Nissan TD25The Nissan TD25 is a 2.5 L (2,488 cc, 151.8 cu·in) straight four, water-cooled naturally aspirated diesel engine from Nissan TD family. The engine was manufactured from 1985.

The TD25 has a cast-iron cylinder block, a cast-iron cylinder head with OHV (over-head valves) design and two valves per cylinder. The camshaft is driven from the crankshaft by the timing gear. The cylinder bore is 93.0 mm (3.66 in) and the piston stroke is 92.0 mm (3.62 in). Compression ratio rating is 22:1.

The TD25 engine produced 81 PS (60 kW; 80 HP) at 4,300 rpm of maximum output power and 166 N·m (16.9 kg·m, 122.3 ft·lb) at 2,200 rpm of peak torque.

The breakdown of the engine code is as follows:

  • TD – Engine Family
  • 25 – 2.5 Liter Displacement

General information

Engine Specifications
Engine codeTD25
LayoutStraight-4, vertical
Fuel typeDiesel
Displacement2.5 L, 2,488 cc (151.8 cu in)
Injection pumpMechanical fuel injection pump
Power addernone
Max. Horsepower81 PS (60 kW; 80 HP) at 4,300 rpm
Torque output166 N·m (16.9 kg·m, 122.3 ft·lb) at 2,200 rpm
Firing order1-3-4-2
Dimensions (L x H x W):

Cylinder block

The Nissan TD25 motor has a cast-iron cylinder block with the five-bearings supported system. A 93.0 mm (3.66 in) cylinder bore and 92.0 mm (3.62 in) piston stroke give the TD25 engine a total of 2,488 cc of displacement. Compression ratio rating is 22:1.

Cylinder block
Cylinder block alloyCast iron
Compression ratio:22.0:1
Cylinder bore:93.0 mm (3.66 in)
Piston stroke:92.0 mm (3.62 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter:92.900-92.910 mm (3.6575-3.6579 in)
Piston skirt diameter92.840-92.850 mm (3.6551-3.6555 in)
Piston ring side clearance:Top0.060-0.100 mm (0.0024-0.0039 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)
Second0.200-0.350 mm (0.0079-0.0138 in)
Oil0.150-0.350 mm (0.0059-0.0138 in)
Piston pin outer diameter24.994-25.000 mm (0.9840-0.9843 in)
Piston pin hole diameter27.997-28.005 mm (1.1022-1.1026 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:46.0 mm (1.81 in)

Cylinder head

The engine has OHV (overhead valves) design with two valves per cylinder (8 in total). The camshaft is driven from the crankshaft by a timing gear, the injection pump is also driven by a gear. Intake valves are 41.5 mm (1.63 in) in diameter, and the exhaust valves are 37.0 mm (1.46 in).

Cylinder head
Block head alloyCast-iron
Valve Arrangement:OHV, gear drive
Valves:8 (2 valves per cylinder)
Valve head diameter:INTAKE41.4-41.6 mm (1.6299-1.6378 in)
EXHAUST36.9-37.1 mm (1.4528-1.4606 in)
Valve length:INTAKE117.0 mm (4.6063 in)
EXHAUST117.0 mm (4.6063 in)
Valve stem diameter:INTAKE7.962-7.977 mm (0.3135-0.3141 in)
EXHAUST7.945-7.960 mm (0.3128-0.3134 in)
Valve spring free length: White: 52.04 mm (2.0488 in)
Yellow: 52.3 mm (2.0591 in)
Camshaft cam height:INTAKE41.733 mm (1.643 in)
EXHAUST41.900 mm (1.6496 in)

Maintenance data

Valve clearance (HOT)
Intake valve0.35 mm (0.0138 in)
Exhaust valve0.35 mm (0.0138 in)
Compression pressure
Standard30.0 kg/cm2 (29.4 bar, 427 psi) / 200 rpm
Minimun25.0 kg/cm2 (24.5 bar, 356 psi) / 200 rpm
Compression differential limit between cylinders3.0 kg/cm2 (2.9 bar, 43 psi) / 200 rpm
Oil system
Recommended engine oilCC 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: 6.2 l
Without oil filter: 5.5 l

Vehicle applications

ModelYears Produced
Nissan Navara (D21)1985-1997
Nissan Caravan (E24)1986-2001
Nissan Homy (E24)1986-2001
Nissan Cedric (Y31)1990-2015
Nissan Atlas 2t (H40)1986-1991
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. I got a 97 hardbody it looks yo have had a head job
    When truck gets to 3 grand it starts to sound like it’s coming to peices….any thoughts on the issue….doesn’t smoke or run hot ju just soundd like it’s coming apart

  2. Is it possible to add a turbocharger to this engine? td25 diesel 4 cylinders. And if so, which one is suitable? nissan picap 1998.

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