The Nissan CD20 is a 2.0 l (1,974 cc, 120.45 cu.in) straight four, water-cooled naturally aspirated diesel engine from Nissan CD family. The engine was used on Nissan mid-size models from 1991 to 2000
The CD20 has a cast-iron cylinder block, an aluminum cylinder head with SOHC (Single overhead camshaft) with two valves per cylinder.
The Nissan CD20 compression ratio is 22.2:1. Cylinder bore and piston stroke are 84.5 mm (3.33 in) and 88.0 mm (3.46 in), respectively. The CD20 produced 75 PS (55 kW; 74 HP) at 4,500 rpm of horsepower and 132 Nm (13.5 kg⋅m, 97 lb⋅ft) at 2,800 rpm of torque.
The breakdown of the engine code is as follows:
- CD – Engine Family
- 20 – 2.0 Liter Displacement
General information
| Engine Specifications | |
| Engine code | CD20 |
| Layout | Straight-4, vertical |
| Fuel type | Diesel |
| Production | 1991-2000 |
| Displacement | 2.0L, 1,974 cc (120.45 cu in) |
| Injection pump | Fuel injection pump |
| Power adder | none |
| Max. Horsepower | 105 PS (77 kW; 103 HP) at 6,000 rpm |
| Torque output | 132 N⋅m (13.5 kg⋅m, 97 lb⋅ft) at 2,800 rpm |
| Firing order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | 180.0 kg (396.8 lbs) |
Cylinder block
The Nissan CD20 motor has a cast-iron cylinder block with five-bearings supported system and an aluminum alloy piston for high strength, lightweight and good heat conductivity; three compression and two oil control rings. The cylinder bore is 84.5 mm (3.33 in), piston stroke is 88.0 mm (3.46 in) and compression ratio rating is 22.2:1.
| Cylinder block | ||
| Cylinder block alloy | Cast iron | |
| Compression ratio: | 22.2:1 | |
| Cylinder bore: | 84.5 mm (3.329 in) | |
| Piston stroke: | 88.0 mm (3.465 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter: | 84.500-54.510 mm (3.3268-3.3272 in) | |
| Piston skirt diameter | 84.465-84.475 mm (3.3254-3.3258 in) | |
| Piston ring side clearance: | Top | 0.060-0.095 mm (0.0024-0.0037 in) |
| Second | 0.040-0.075 mm (0.0016-0.0030 in) | |
| Oil | 0.030-0.070 mm (0.0012-0.0028 in) | |
| Piston ring end gap: | Top | 0.20-0.30 mm (0.0079-0.0118 in) |
| Second | 0.38-0.53 mm (0.0150-0.0209 in) | |
| Oil | 0.30-0.55 mm (0.0118-0.0217 in) | |
| Piston pin outer diameter | 24.994-25.000 mm (0.9840-0.9843 in) | |
| Piston pin hole diameter | 24.991-24.999 mm (0.9839-0.9842 in) | |
| Crankshaft main journal diameter: | 52.967-52.975 mm (2.0853-2.0856 in) | |
| Crankpin diameter: | 49.968-49.974 mm (1.9672-1.9675 in) | |
| Crankshaft center distance: | 44.000 mm (1.7322 in) | |
Main bearing cap bolts tightening procedure and torque specs:
- 76-78 Nm; 7.8-8.0 kg·m; 56-58 ft·lb
After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing nut
- Step 1: 14-16 Nm; 1.4-1.6 kg·m; 10-11 ft·lb
- Step 2: Turn nuts 60-65° or 37-45 Nm; 3.8-4.6 kg·m; 27-33 ft·lb
Crankshaft pulley
- 142-152 Nm; 14.5-15.5 kg·m; 105-112 ft·lb
Flywheel fixing bolts
- 83-93 Nm; 8.5-9.5 kg·m; 61-69 ft·lb
Cylinder head
The engine has SOHC design with a single camshaft and two valves per cylinder. The camshaft is driven from the crankshaft by a timing belt, the injection pump is also driven by a belt. Intake valves are 39 mm (1.53 in) in diameter, and the exhaust valves are 32 mm (1.26 in). The CD20 engine uses two valve springs. For engines of different production years, the cylinder heads could be different.
| Cylinder head (Almera N15 specs) | ||
| Block head alloy | Aluminium | |
| Valve Arrangement: | SOHC, belt drive | |
| Valves: | 8 (2 valves per cylinder) | |
| Valve head diameter: | INTAKE | 39.0-39.3 mm (1.535-1.547 in) |
| EXHAUST | 32.0-32.3 mm (1.260-1.272 in) | |
| Valve length: | INTAKE | 100.53-100.97 mm (3.9579-3.9752 in) |
| EXHAUST | 100.38-100.82 mm (3.9520-3.9693 in) | |
| Valve stem diameter: | INTAKE | 6.965-6.980 mm (0.2742-0.2748 in) |
| EXHAUST | 6.945-6.960 mm (0.2734-0.2740 in) | |
| Valve spring free length: | INTAKE | Inner: 43.2 mm (1.701 in) Outer: 38.2 mm (1.504 in) |
| EXHAUST | Inner: 43.2 mm (1.701 in) Outer: 38.2 mm (1.504 in) | |
| Camshaft cam height: | INTAKE | 49.20-49.25 mm (1.9370-1.9390 in) |
| EXHAUST | 49.15-49.20 mm (1.9350-1.9370 in) | |
| Camshaft journal diameter: | 29.935-29.955 mm (1.1785 – 1.1793 in) | |
Head tightening procedure and torque specs:
- Step 1: 39 Nm; 4.0 kg·m; 29 ft·lb
- Step 2: 83-93 Nm; 8.5-9.5 kg·m; 61-68 ft·lb
- Step 3: Turn all bolts 180-190°
- Step 4: Loosen all bolts completely
- Step 5: 39 Nm; 4.0 kg·m; 29 ft·lb
- Step 6: Turn all bolts 75-80°
Camshaft-bracket nuts
- 18-22 Nm; 1.8-2.2 kg·m; 13-16 ft·lb
Cramshaft sprocket
- Front: 87-107 Nm; 8.9-10.9 kg·m; 64-79 ft·lb
- Rear: 87-107 Nm; 8.9-10.9 kg·m; 64-79 ft·lb
Injection pump sprocket
- 59-69 Nm; 6.0-7.0 kg·m; 43-51 ft·lb
Maintenance data
| Valve clearance (HOT) | |
| Intake valve | 0.25-0.35 mm (0.010-0.014 in) |
| Exhaust valve | 0.39-0.049 mm (0.015-0.019 in) |
| Compression pressure | |
| Standard | 32 kg/cm2 (31.4 bar, 455 psi) / 200 rpm |
| Minimun | 25 kg/cm2 (24.5 bar, 356 psi) / 200 rpm |
| Compression differential limit between cylinders | 5 kg/cm2 (4.9 bar, 71 psi) / 200 rpm |
| Oil system | |
| Recommended engine oil | API-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: 5.0 l Without oil filter: 4.5 l |
Vehicle applications
| Model | Years Produced |
| Nissan Serena C23 | 1991–1993 |
| Nissan Avenir Cargo W10 | 1990–1998 |
| Nissan Sunny B14 | 1994–1998 |
| Nissan Pulsar N15 | 1995–1999 |
| Nissan Wingroad Y10 | 1996–1999 |
| Nissan Almera N15 | 1995–2000 |
| Nissan Primera P10 | 1992–1995 |
| Nissan AD Y10 | 1997–1999 |
Author:
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