Nissan MR20DD

Nissan MR20DD engineThe Nissan MR20DD is a 2.0 l (1,997 cc, 121,68 cu.in.) straight-four 4-stroke natural aspirated gasoline engine from Nissan MR-family.

The MR20DD features lightweight aluminum block with the fully balanced five-bearings crankshaft and aluminum head with two camshafts (DOHC) and four valves per cylinder. Compression ratio rating is 11.2:1. Cylinder bore and the piston stroke are 84.0 mm (3.3 in) and 90.1 mm (3.54 in), respectively.

The MR20DD engine is equipped with the direct injection fuel system, electronic throttle, Twin CVTC (continuous variable valve timing system) on both the intake and exhaust camshafts, EGR system and electronic ignition with individual coils on each spark plug (NDIS).

It produces from 144 PS (106 KW; 142 HP) at 5,600 rpm to 150 PS (110 KW; 148 HP) at 6,000 rpm of horsepower and from 200 Nm (20.4 kg·m; 147.6 ft·lb) at 4,400 rpm to 210 Nm (21.4 kg·m; 155.0 ft·lb) at 4,400 rpm of torque.

The breakdown of the engine code is as follows:

  • MR – Engine Family
  • 20 – 2.0 Liter Displacement
  • D – DOHC (Dual Overhead Camshafts)
  • D – Direct Injection

General information

Engine Specifications
Engine codeMR20DD
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production2010-
Displacement2.0 L, 1,997 cc (121.68 cu in)
Fuel systemDirect Injection Fuel System
Power adderNone
Power output 144 PS (106 KW; 142 HP) at 5,600 rpm
144 PS (106 KW; 142 HP) at 6,000 rpm
147 PS (108 KW; 145 HP) at 5,600 rpm
147 PS (108 KW; 145 HP) at 6,000 rpm
150 PS (110 KW; 148 HP) at 6,000 rpm
Torque output 200 Nm (20.4 kg·m; 147.6 ft·lb) at 4,400 rpm
207 Nm (21.1 kg·m; 152.8 ft·lb) at 4,400 rpm
210 Nm (21.4 kg·m; 155.0 ft·lb) at 4,400 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight

Cylinder block

Cylinders in the Nissan MR20DD engines are fitted at an offset to minimize friction arising from the angle of the connecting rod as a piston descends into the cylinder. The crankshaft and camshaft journals are finished with a polishing tape to produce a mirror-like finish. The result is a thorough reduction in friction on these bearing surfaces of key engine components. Each piston is equipped with two compression and single oil control ring.

Cylinder block
Cylinder block alloyAluminium
Compression ratio:11.2:1
Cylinder bore:84.0 mm (3.307 in)
Piston stroke:90.1 mm (3.547 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):84.000-84.010 mm (3.3071-3.3075 in)
Piston skirt diameter (standard):83.970-83.980 mm (3.3059-3.3063 in)
Piston pin outer diameter:19.989-19.995 mm (0.7870 – 0.7872 in)
Piston ring side clearance:Top0.040-0.080 mm (0.0016-0.0031 in)
Second0.030-0.070 mm (0.0012-0.0028 in)
Oil0.055-0.155 mm (0.0022-0.0061 in)
Piston ring end gap:Top0.20-0.30 mm (0.008-0.012 in)
Second0.50-0.65 mm (0.020-0.026 in)
Oil0.15-0.45 mm (0.006-0.018 in)
Connecting rod bushing inner diameter:20.000 – 20.012 mm (0.7874 – 0.7879 in)
Connecting rod big end diameter:47.000-47.001 mm (1.8504-1.8504 in)
Connecting rod center distance:138.97-139.07 mm (5.471-5.475 in)
Crankshaft main journal diameter:51.978-51.979 mm (2.0464-2.0464 in)
Crankpin diameter:43.970 mm (1.7311 in)
Crankshaft center distance:44.87-44.89 mm (1.7673-1.7705 in)

Main bearing cap bolts tightening procedure and torque specs:

  • Step 1: 34.3 Nm; 3.5 kg·m; 25 ft·lb
  • Step 2: Turn all bolts 60°

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

Connecting rod bearing bolts

  • Step 1: 27.4 Nm; 2.8 kg·m; 20 ft·lb
  • Step 2: 0 Nm; 0 kg·m; 0 ft·lb
  • Step 3: 19.6 Nm; 2.0 kg·m; 14 ft·lb

Crankshaft pulley bolt

  • Step 1: 68.6 Nm; 7.0 kg·m; 51 ft·lb
  • Step 2: 0 Nm; 0 kg·m; 0 ft·lb
  • Step 3: 29.4 Nm; 3.0 kg·m; 22 ft·lb

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

  • 108 Nm; 11 kg·m; 80 ft·lb

Cylinder head

The cylinder head is made of strong, light aluminum alloy which gives it good cooling efficiency. Each camshaft is supported by five bearings. The MR20DD has continuous variable valve timing system (C-VTC) on both the intake and exhaust camshafts. C-VTC enables variable valve timing in response to engine rpm and throttle opening. Enhanced control and reduced system friction improve response and optimize torque characteristics.

Intake valves are 34.0 mm (1.34 in) in diameter, intake duration is 240°, and the exhaust valves are 27.7 mm (1.09 in), exhaust duration is 220°. The MR20DD motor does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.

Cylinder head
Valve Arrangement:DOHC, chain drive
Cylinder head height:130.9 mm (5.15 in)
Valves:16 (4 valves per cylinder)
Valve timing:INTAKE240°
EXHAUST220°
Valve head diameter:INTAKE33.8-34.1 mm (1.331-1.343 in)
EXHAUST27.6-27.9 mm (1.087-1.098 in)
Valve length:INTAKE106.42 mm (4.19 in)
EXHAUST105.41 mm (4.15 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:INTAKE49.4-49.6 mm (1.945-1.953 in)
EXHAUST54.5-54.7 mm (2.146-2.154 in)
Camshaft cam height:INTAKE45.265-45.455 mm (1.7821-1.7896 in)
EXHAUST43.775-43.965 mm (1.7234-1.7309 in)
Camshaft journal diameter:№127.935-27.955 mm (1.0998-1.1006 in)
№2, 3, 4, 524.950-24.970 mm (0.9823-0.9381 in)

Head tightening procedure and torque specs:

  • Step 1: 40 Nm; 4.1 kg·m; 30 ft·lb
  • Step 2: Turn all bolts 100°
  • Step 3: Loosen all bolts completely
  • Step 4: 40 Nm; 4.1 kg·m; 30 ft·lb
  • Step 5: Turn all bolts 100°
  • Step 6: Turn all bolts another 100°

Camshaft sprocket bolts

  • Intake: 35.0 Nm; 3.6 kg·m; 26 ft·lb
  • Exhaust: 88.2 Nm; 9.0 kg·m; 65 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve0.304-0.416 mm (0.012-0.016 in)
Exhaust valve0.308-0.432 mm (0.012-0.017 in)
Compression pressure
Standard15.6 kg/m2 (222 psi) / 250 rpm
Minimun13.1 kg/m2 (186 psi) / 250 rpm
Compression differential limit between cylinders1.0 kg/m2 (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 oil5W-30
Oil type APISL or SM
Engine oil capacity (Refill capacity) With filter change 3.8 l (4.0 qt.)
Without filter change 3.6 l (3.9 qt.)
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
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 plugNGK: PLZKAR6A-11 (Platinum-tipped)
Spark plug gap1.1 mm (0.043 in)
Spark plug tightening torque19.6 Nm, 2.0 kg·m, 14 ft·lb

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 26 sizes range from 3.00 mm (0.1181 in) to 3.50 mm (0.1378 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 332H.

ColdHot
Intake0.24-0.32 (0.009-0.013)0.304-0.416 mm (0.012-0.016 in)
Exhaust0.26-0.34 (0.010-0.013)0.308-0.432 mm (0.012-0.017 in)

Vehicle applications

ModelYears Produced
Nissan Serena2010-
Nissan X-Trail2013-
Nissan Qashqai (Australia, New Zealand)2014-
Nissan Juke (F15)2015-
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