The Chrysler PowerTech 3.7L (also known as 3.7 EGK or Dodge 3.7L Magnum) is a 3.7 l (3,703 cc, 226.0 cu.in.) natural aspirated V6 90° four-stroke gasoline engine manufactured by Chrysler in Detroit, Michigan, USA from 2002 up to 2012.
The Chrysler PowerTech 3.7L features a cast-iron block and two aluminum cylinder heads with a single camshaft (SOHC) and two valves per cylinder (12 valves in total). The Chrysler 3.7L PowerTech/Magnum engine is equipped with a sequential multiport fuel injection system and an electronic ignition system with a separate ignition coil for each cylinder.
The compression ratio rating is 9.6:1. The cylinder bore and the piston stroke are 93.0 mm (3.66 in) and 90.8 mm (3.57 in), respectively. This engine produces 213.5 PS (157 kW; 210.5 HP) at 5,200 rpm of horsepower and 319 N·m (32.5 kg·m, 235.1 ft·lb) at 4,000 rpm of maximum torque.
General information
| Engine Specifications | |
| Engine model | Chrysler PowerTech 3.7L (3.7 EGK or Dodge 3.7L Magnum) |
| Layout | Four stroke, V6 |
| Fuel type | Gasoline (petrol) |
| Production | 2002-2012 |
| Displacement | 3.7 L, 3,703 cc (226.0 cu in) |
| Fuel system | Sequential Multiport Fuel Injection |
| Power adder | None |
| Power output | 213.5 PS (157 kW; 210.5 HP) at 5,200 rpm |
| Torque output | 319 N·m (32.5 kg·m, 235.1 ft·lb) at 4,000 rpm |
| Firing order | 1-6-5-4-3-2 |
| Dimensions (L x W x H): | – |
Cylinder block
The PowerTech 3.7L engine has a cast-iron block with a four-bearings crankshaft supported system. The cylinder bore is 93.0 mm (3.66 in), piston stroke is 90.8 mm (3.57 in) and the compression ratio rating is 9.6:1. This motor has aluminum alloy pistons with two compression and one oil control rings, forged steel connecting rods, and nodular iron crankshaft. The crankshaft main journal diameter is 63.5 mm (2.5 in) and the crankpin diameter is 57.9 mm (2.28 in). The crankshaft is a three throw split pin design with
six counterweights for balancing purposes.
| Cylinder block | ||
| Cylinder block alloy | Cast-iron | |
| Compression ratio: | 9.6:1 | |
| Cylinder bore: | 93.0 mm (3.66 in) | |
| Piston stroke: | 90.8 mm (3.57 in) | |
| Number of piston rings (compression / oil): | 2/1 | |
| Number of main bearings: | 4 | |
| Cylinder inner diameter (standard): | 92.940-93.090 mm (3.659-3.665 in) | |
| Piston pin outer diameter: | 24.017-24.020 mm (0.9455-0.9457 in) | |
| Piston ring side clearance: | Top | 0.051-0.094 mm (0.002-0.0037 in) |
| Second | 0.040-0.080 mm (0.0016-0.0031 in) | |
| Oil | 0.019-0.229 mm (0.0007-0.009 in) | |
| Piston ring end gap: | Top | 0.200-0.360 mm (0.0079-0.0142 in) |
| Second | 0.370-0.630 mm (0.0146-0.0248 in) | |
| Oil | 0.250-0.760 mm (0.0098-0.0299 in) | |
| Crankshaft main journal diameter: | 63.488-63.512 mm (2.4995-2.5005 in) | |
| Crankpin diameter: | 57.892-57.908 mm (2.2792-2.2798 in) | |
Connecting rod cap bolts
- Step 1: 2.7 Nm; 2.7 kg·m; 20 ft·lb
- Step 2: Turn all bolts 90°
Crankshaft Damper bolt
- 175 Nm; 17.5 kg·m; 130 ft·lb
Cylinder head
The cylinder heads are made of aluminum. The engine has a single overhead camshaft. The camshafts are driven by timing chains. The intake valve diameter is 48.65 mm (1.915 in), the duration is 245.7° the exhaust valve diameter is 37.0 mm (1.46 in), the duration is 261.6°. The Chrysler PowerTech 3.7L V6 engine is equipped with hydraulic valve tappets.
| Cylinder head | ||
| Block head alloy | Aluminum | |
| Valve Arrangement: | SOHC, chain drive | |
| Head surface flatness | – | |
| Valves: | 12 (2 valves per cylinder) | |
| Intake valve timing | 245.7° | |
| Exhaust valve timing: | 261.6° | |
| Valve head diameter: | INTAKE | 48.520-48.780 mm (1.9102-1.9205 in) |
| EXHAUST | 36.870-37.130 mm (1.4516-1.4618 in) | |
| Valve length: | INTAKE | 113.450-114.210 mm (4.4665-4.4964 in) |
| EXHAUST | 114.920-115.68 mm (4.5244-4.5543 in) | |
| Valve stem diameter: | INTAKE | 6.931-6.957 mm (0.2729-0.2739 in) |
| EXHAUST | 6.902-6.928 mm (0.2717-0.2728 in) | |
| Valve spring free length: | INTAKE | 48.180 mm (1.8968 in) |
| EXHAUST | 48.200 mm (1.8976 in) | |
Maintenance data
| Compression pressure | |
| Standard | 1172-1551 kPa (170-225 psi) |
| Oil system | |
| Recommended engine oil | SAE: SAE 5W-30 (SAE 5W-20 after 2007) |
| Oil type API | API: Diamler-Chrysler Mopar or equivalent |
| Engine oil capacity (Refill capacity) | 4.7 L (4.97 US. qt, 4.14 Imp. qt.) |
| Oil pressure |
Idle speed: 25 kPA, (4 psi) 3,000 rpm 170-758 kPA, (25-110 psi) |
| Ignition system | |
| Spark plug | NGK ZFR6F-11G |
| Spark plug gap | 1.1 mm (0.043 in) |
| Spark plug tightening torque | 27 N·m (2.8 kg·m, 19.9 ft·lb) |
Vehicle applications
| Model | Years Produced |
| Dodge Ram 1500 | 2002–2010 |
| Dodge Ram 1500 | 2011-2012 |
| Dodge Dakota | 2004–2011 |
| Dodge Durango | 2004–2009 |
| Dodge Nitro | 2007–2011 |
| Jeep Liberty/Cherokee | 2002–2013 |
| Jeep Grand Cherokee | 2005–2010 |
| Jeep Commander | 2006–2010 |
| Mitsubishi Raider | 2006–2010 |
| Dodge M80 | 2002 |
Author:
2010 Jeep liberty 3.7L Chrysler has up grade their ignition coils, why is the secondary coil gone to a higher voltage ?