Nissan J13

Nissan J13The Nissan J13 is a carbureted 1.3 liter (1,299 cc, 79.3 straight-four, four-stroke cycle gasoline from Nissan J-family. The J13 engine was producted since 1965 to 1969.

The Nissan J13 engine has a deep skirt, cast-iron cylinder block with cast-iron cylinders and cast iron head with bathtub type combustion chambers. It has an OHV type valve mechanism and 8 valves (2 per cylinder).

The J13 engine has a 73 mm (2.87 in) cylinder bore and 77.6 mm (3.06 in) piston stroke with a compression ratio of 8.2:1.

The Nissan J13 produced 67 HP (50 kW; 68 PS) of horsepower.

The breakdown of the engine code is as follows:

  • J – Engine Family
  • 13 – 1.3 Liter Displacement

General information

Engine Specifications
Engine codeJ13
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Displacement1.3 L, 1,299 cc (79.3 cu in)
Fuel systemCarburetor
Power adderNone
Max. horsepower67 HP (50 kW; 68 PS)
Max. torque
Firing order1-3-4-2
Dimensions (L x H x W):

Cylinder block

The crankshaft is a fully counterbalanced, three bearing type designed to turn out smooth, dependable power. Water is forced through the water jackets to deprive the cylinders of unwanted combustion heat. The crankshaft is of special steel forging with three main bearing journals. To provide balance, four counter-balance weights arc provided just opposite the cranks. The main bearing journals and connecting rod journals are cases hardened and finished to extreme smoothness for increased wear resistance.

The pistons are made of aluminum alloy casting. The piston pin is a full floating fit to the piston while it is press-fitted to the connecting rod small end. The connecting rod is a special steel forging. On the Nissan J13 engine, the piston pin is bolted to the small end to prevent it from working out of place during operation. The cylinder walls are lubricated by oil squirted from the oil jets located at the connecting rod big ends. The pistons are each fitted with two compression rings and a single oil ring.

Cylinder block
Cylinder block alloyCast iron
Compression ratio:8.2:1
Cylinder bore:73 mm (2.87 in)
Piston stroke:77.6 mm (3.06 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:3
Cylinder inner diameter (standard):73.000-73.050 mm (2.8740-2.8760 in)
Piston pin outer diameter:17.447-17.452 mm (0.6869-0.6871 in)
Piston pin hole diameter:17.453-17.460 mm (0.6871-0.6874 in)
Piston diameter:72.987-73.037 mm (2.8735-2.8755 in)
Piston ring side clearance:Top0.036-0.076 mm (0.0014-0.0030 in)
Second0.036-0.076 mm (0.0014-0.0030 in)
Piston ring end gap:Top0.30-0.33 mm (0.079-0.130 in)
Second0.30-0.33 mm (0.079-0.130 in)
Oil0.30-0.90 mm (0.0118-0.0354 in)
Connecting rod center distance:142.67 mm (5.617 in)
Crankshaft journal diameter:50.813-50.825 mm (2.0005-2.0010 in)
Crankpin diameter:47.640-47.652 mm (1.8756-1.8761 in)
Crankshaft center distance:38.8 mm (1.528 in)

Cylinder head

The cylinder head is made of steel casting. It contains bathtub type combustion chambers. A special sintered alloy valve seat is installed on the exhaust valve. It is press-fitted.

The camshaft is of special steel casting and is supported by three main bearings. The cam lobes are case hardened and finished to extreme smoothness for increased wear resistance. The rocker shaft is made of carbon steel: it is also case hardened for increased durability. The valve train consists of the camshaft, push rod, valve rocker arm, and valve; motion is transmitted through these four parts in the order listed. The valve spring is of double spring type, inner and outer.

Cylinder head
Valve Arrangement:OHV, chain drive
Valves:8 (2 valves per cylinder)
Intake/Exhaust duration:244°/244°
Valve head diameter:INTAKE34.8-35.0 mm (1.370-1.378 in)
EXHAUST29.9-30.1 mm (1.177-1.185 in)
Valve length:INTAKE109.35-109.65 mm (4.3051-4.3169) in)
EXHAUST108.55-108.85 mm (4.2736-4.2854 in)
Valve stem diameter:INTAKE8.680-8.693 mm (0.3417-0.3422 in)
EXHAUST8.680-8.693 mm (0.3417-0.3422 in)
Valve spring length
(Double spring type):
OUTER52.0 mm (2.047 in)
INNER50.0 mm (1.969 in)
Valve spring length
(Single spring type):
47.1 mm (1.854 in)
Camshaft journal diameterFRONT45.434-45.447 mm (1.7887-1.7892 in)
CENTER43.897-43.910 mm (1.7282-1.7287 in)
REAR41.218-41.231 mm (1.6228-1.6233 in)
Camshaft lobe height:37.60-37.70 mm (1.4803-1.4842 in)

Tightening torque specs

Tightening torque specs
Cylinder head stud nut50-60 Nm; 5.0-6.0 kg·m; 36-43 ft·lb
Rocker shaft bracket bolt20-30 Nm; 2.0-3.0 kg·m; 14-22 ft·lb
Connecting rod big end nut28-35 Nm; 2.8-3.5 kg·m; 20-25 ft·lb
Connecting rod small end bolt28-35 Nm; 2.8-3.5 kg·m; 18-25 ft·lb
Flywheel fixing bolt40-50 Nm; 4.0-5.0 kg·m; 29-36 ft·lb
Main bearings cap bolts100-110 Nm; 11.0-11.0 kg·m; 72-80 ft·lb
Camshaft sprocket bolts40-50 Nm; 4.0-5.0 kg·m; 29-36 ft·lb
Oil pan bolts5-10 Nm; 0.5-1.0 kg·m; 3.6-7.2 ft·lb
Oil pump bolts12-18 Nm; 1.2-1.8 kg·m; 3.6-7.2 ft·lb
Oil pan drain plug20-30 Nm; 2.0-3.0 kg·m; 14.5-21.7 ft·lb
Carburetor nuts8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Manifold nuts17-23 Nm; 1.7-2.3 kg·m; 12-17 ft·lb
Fuel pump nuts12-18 Nm; 1.2-1.8 kg·m; 8.7-13.0 ft·lb
Crank pulley bolt12-14 Nm; 1.2-1.4 kg·m; 8.7-10.1 ft·lb
Water pump bolts12-18 Nm; 1.2-1.8 kg·m; 8.7-13.0 ft·lb
Oil filter bolts16-24 Nm; 1.6-2.4 kg·m; 12-17 ft·lb
Side cover bolts4-8 Nm; 0.4-0.8 kg·m; 2.9-5.8 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve0.35 mm (0.0138 in)
Exhaust valve0.35 mm (0.0138 in)
Compression pressure
Standard12.0 kg/cm2 (11.77 bar, 171 psi) / 350 rpm
Minimun9.0 kg/cm2 (8.83 bar, 128 psi) / 250 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30
Oil type APISE
Engine oil capacity (Refill capacity) With filter change 4.4 l
Without filter change 3.4 l
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Ignition system
Ignition timing (B.T.D.C./rpm)8°/600 rpm
Spark plug NGK:B4ES
Spark plug gap0.8-0.9 mm (0.03 -0.035 in)
Spark plug tightening torque15-20 Nm; 1.5-2.0 kg·m; 11-14 ft·lb

Vehicle applications

ModelYears Produced
Datsun 4111965-1967
Datsun 520, 5211967-1969
Nissan Bluebird 510s (Mexico)
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.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

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. Help ! I am missing one of the two carburetor drain plugs and gasket from what I think is the stock carb on a 67 Datsun 520 truck … seems to run fine but leaks gas as the plug that is in there now has been changed and appears to be to small

Leave a Reply

Your email address will not be published.