Nissan CR12DE

Nissan CR12DEThe Nissan CR12DE is a 1.2 l (1,240 cc, 75.66 cu.in.) straight-four 4-stroke natural aspirated gasoline engine from Nissan CR-family.

The CR12DE features a lightweight aluminum block with five-bearings crankshaft and aluminum head with two camshafts (DOHC) and four valves per cylinder. The CR12DE engine has an electronic throttle, variable valve timing system VTC on the intake camshaft, EGR system and electronic ignition with individual coils on each spark plug.

Compression ratio rating is 9.8 or 9.9:1. Cylinder bore and piston stroke are 71.0 mm (2.795 in) and 78.3 mm (3.083 in), respectively. It produces from 80 to 110 PS (59-81 kW; 79-109 HP) of horsepower and 121 to 134 Nm (12.4-13.7 kg⋅m, 89.2-98.8 lb⋅ft) of torque.

The breakdown of the engine code is as follows:

  • CR – Engine Family
  • 12 – 1.2 Liter Displacement
  • D – DOHC (Dual Overhead Camshafts)
  • E – Multi Point Fuel Injection

General information

Engine Specifications
Engine codeCR12DE
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production2002-
Displacement1.2 l, 1,240 cm3, (75.66 cu.in.)
Fuel systemMulti Point Fuel Injection
Power adderNone
Power output 80 PS (59 kW; 79 HP) at 5,600 rpm
90 PS (66 kW; 89 HP) at 5,600 rpm
110 PS (81 kW; 109 HP) at 6,000 rpm
Torque output 121 Nm (12.4 kg⋅m, 89.2 lb⋅ft) at 4,000 rpm
134 Nm (13.7 kg⋅m, 98.8 lb⋅ft) at 3,600 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight120 kg (264 lbs)

Cylinder block

The Nissan CR12DE has an aluminum block with a five-bearings crankshaft supported system. The cylinder bore is 71.0 mm (2.79 in), piston stroke is 78.3 mm (3.083 in) and compression ratio rating is 9.8:1 or 9.9:1. The CR12DE motor has two compression and single oil control rings.

The connecting rods center distance is 129.5 mm (5.098 in). The crankshaft main journal diameter is 44.97 mm (1.77 in) and crankpin diameter is 39.97 mm (1.53 in). The piston height is 34.3 mm (1.350 in).

Cylinder block
Cylinder block alloyAluminium
Compression ratio:9.8:1 or 9.9:1
Cylinder bore:71.0 mm (2.79 in)
Piston stroke:78.3 mm (3.083 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):71.000-71.010 mm (2.7953-2.7957 in)
Piston skirt diameter (standard):70.980-70.990 mm (2.7945-2.7949 in)
Piston pin outer diameter:17.996-18.000 mm (0.7085-0.7087 in)
Piston ring side clearance:Top0.040-0.080 mm (0.0016-0.0031 in)
Second0.025-0.070 mm (0.0010-0.0028 in)
Oil0.030-0.140 mm (0.0021-0.0055 in)
Piston ring end gap:Top0.18-0.33 mm (0.0071-0.0130 in)
Second0.50-0.65 mm (0.020-0.026 in)
Oil0.20-0.70 mm (0.0079-0.0276 in)
Connecting rod bushing inner diameter:17.962-17.978 mm (0.7072-0.7078 in)
Connecting rod big end diameter:43.000-43.013 mm (1.6929-1.6934 in)
Connecting rod center distance:129.45-129.55 mm (5.096-5.100 in)
Crankshaft main journal diameter:44.970 mm (1.7705 in)
Crankpin diameter:39.974 mm (1.5738 in)

Main bearing cap bolts tightening procedure and torque specs:

  • Step 1: 24.5-30.3 Nm; 2.5-3.0 kg·m; 18-22 ft·lb
  • Step 2: Turn all bolts 95-100°

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

Connecting rod bearing nut

  • Step 1: 13.7-15.7 Nm; 1.4-1.6 kg·m; 10-11.5 ft·lb
  • Step 2: Turn nuts 45-50°

Crankshaft pulley bolt

  • 132-152 Nm; 14-15 kg·m; 98-112 ft·lb

Flywheel (M/T) or Drive plate (A/T) fixing bolts

  • Flywheel: 83-93 Nm; 8.5-9.5 kg·m; 61-69 ft·lb
  • Drive plate: 93-103 Nm; 9.5-10.0 kg·m; 69-75 ft·lb

Cylinder head

The cylinder head is made of light aluminum alloy, each camshaft is supported by five bearings. The CR12DE engine is equipped with an intake valve timing controller (integral with cam sprocket) which continuously adjusts the phase of intake valve according to driving conditions, improves both low and mid-range engine torque and high-speed range engine output, and brings about low emission and low fuel consumption. The camshafts are driven by the timing chain.

Intake valves are 27.5 mm (1.083 in) in diameter, intake duration is 224°, and the exhaust valves are 22.5 mm (0.886 in), exhaust duration is 216°. The Nissan CR12DE motor does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.

The engine has a plastic intake manifold. The CR12DE is equipped with EGR (Exhaust Gas Recirculation) system. This system returns a portion of the exhaust gas to the intake side to reduce fuel consumption and minimize emission.

Cylinder head
Valve Arrangement:DOHC, chain drive
Cylinder head height:121.2 mm (4.77 in)
Valves:16 (4 valves per cylinder)
Valve timing:INTAKE224°
EXHAUST216°
Valve head diameter:INTAKE27.4-27.6 mm (1.079-1.087 in)
EXHAUST22.4-22.6 mm (0.882-0.890 in)
Valve length:INTAKE97.85 mm (3.8524 in)
EXHAUST97.92 mm (3.8551 in)
Valve stem diameter:INTAKE5.465-5.480 mm (0.2152-0.2157 in)
EXHAUST5.455-5.470 mm (0.2148-0.2154 in)
Valve spring free length:53.5 mm (2.098 in)
Camshaft cam height:INTAKE40.359-40.549 mm (1.5889-1.5964 in)
EXHAUST39.743-39.933 mm (1.5647-1.5722 in)
Camshaft journal diameter:№127.935-27.955 mm (1.0998-1.1006 in)
№2, 3, 4, 523.450-23.470 mm (0.9232-0.9240 in)

Head tightening procedure and torque specs:

  • Step 1: 61.7-71.7 Nm; 6.3-7.3 kg·m; 46-52 ft·lb
  • Step 2: Loosen all bolts completely
  • Step 3: 22.5-32.5 kg·m; 2.3-3.3 kg·m; 17-23 ft·lb
  • Step 4: Turn all bolts 90-95°

Camshaft sprocket bolts

  • 78-88 Nm; 8.0-9.0 kg·m; 58-65 ft·lb

Problems and malfunctions

The main problem of this engine is the loss of power, rough idle. It happens because of the front catalytic converters. They wear out because of poor quality fuel, and their ceramic dust through the EGR system is absorbed by the engine. As a result, it grinds the cylinder walls, and then the dust gets into the oil system and spreads all over the engine.

Maintenance data

Valve clearance (HOT)
Intake valve0.314-0.426 mm (0.012-0.017 in)
Exhaust valve0.338-0.462 mm (0.013-0.018 in)
Compression pressure
Standard14.2 kg/cm2 (202 psi) / 250 rpm
Minimun12.6 kg/cm2 (179 psi) / 250 rpm
Compression differential limit between cylinders1.0 kg/cm2 (15 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 For warm and cold areas: 10W-30
For hot areas: 20W-40 or 20W-50
For improve fuel economy: 5W-30
Oil type APISG, SH or SJ
Engine oil capacity (Refill capacity) With filter change 3.0 l (2-5/8 qt)
Without filter change 2.8 l (2-1/2 qt.)
Oil change interval, km (miles)15,000 (9,000)
Oil Pressure, kPa (bar, kg/cm 2, psi) Idle speed: More than 60 (0.6, 0.61, 9)
2,000 rpm: More than 200 (2.0, 2.0, 29)
Ignition system
Spark plug Standard type:NGK: LFR5AP-11, Champion: REC10PYC4
Hot type:NGK: LFR4AP-11
Cold type:NGK: LFR6AP-11
Spark plug gap1.1 mm (0.043 in)

Valve clearance adjustment data

Calculate the thickness of new adjusting valve lifter so valve clearance comes within specified values.

R = Thickness of removed valve lifter
N = Thickness of new valve lifter
M = Measured valve clearance

Intake:
N = R + [M – 0.30 mm (0.012 in)]
Exhaust:
N = R + [M – 0.33 mm (0.013 in)]

Valve lifters are available in 35 sizes range from 3.00 mm (0.1181 in) to 3.68 mm (0.1449 in), in steps of 0.02 mm (0.0008 in).

Example (intake valve):
R = 3.10 mm
M = 0.52 mm
N = 3.10 + (0.52 – 0.30) = 3.32 mm, so we need a valve lifter with identification mark 32.

ColdHot
Intake0.29-0.37 mm (0.011-0.015 in)0.314-0.426 mm (0.012-0.017 in)
Exhaust0.32-0.40 mm (0.013-0.016 in)0.338-0.462 mm (0.013-0.018 in)

Vehicle applications

ModelYears Produced
Nissan March K122002-
Nissan Micra K122002-
Nissan Wingroad2006-
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