The Chrysler/Dodge 239 Magnum is a 3.9 l (3,906 cc, 239.0 cu.in.) natural aspirated V6 90° four-stroke gasoline engine from Chrysler LA/Magnum-family. This engine was manufactured from 1992 up to 2003.
The Chrysler 239 Magnum features a cast-iron block and two cast-iron heads with a single camshaft (OHV) and two valves per cylinder (12 valves in total). The Chrysler 3.9L Magnum engine is equipped with a multi-point fuel injection system (form 1992 to 1996) or a sequential multiport fuel injection system (after 1997) and a mechanically timed electrical ignition system with an ignition coil and mechanical distributor.
The compression ratio rating is 9.1:1. Cylinder bore and the piston stroke are 99.3 mm (3.91 in) and 84.0 mm (3.31 in), respectively. It produces from 177 PS (130 kW; 175 HP) at 4,400 rpm to 182 PS (134 kW; 180 HP) at 4,400 rpm of horsepower and from 264 N·m (26.9 kg·m, 194.6 ft·lb) at 3,200 rpm to 305 N·m (31.1 kg·m, 224.8 ft·lb) at 3,200 rpm of maximum torque.
General information
| Engine Specifications | |
| Engine model | Chrysler 3.9 L (239 cu in) Magnum |
| Layout | Four stroke, V6 |
| Fuel type | Gasoline (petrol) |
| Production | 1992-2003 |
| Displacement | 3.9 L, 3,906 cc (239.0 cu in) |
| Fuel system | 1992-1996: Multi Point Fuel Injection 1997-2003:: Sequential Multiport Fuel Injection |
| Power adder | None |
| Power output | From 177 PS (130 kW; 175 HP) at 4,400 rpm to 182 PS (134 kW; 180 HP) at 4,400 rpm |
| Torque output | From 264 N·m (26.9 kg·m, 194.6 ft·lb) at 3,200 rpm to 305 N·m (31.1 kg·m, 224.8 ft·lb) at 3,200 rpm |
| Firing order | 1-6-5-4-3-2 |
| Dimensions (L x W x H): | – |
Cylinder block
The 239 Magnum engine has a cast-iron block with a four-bearings crankshaft supported system. The cylinder bore is 99.3 mm (3.91 in), piston stroke is 84.0 mm (3.31 in) and compression ratio rating is 9.1:1. 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 53.0 mm (2.08 in).
| Cylinder block | ||
| Cylinder block alloy | Cast-iron | |
| Compression ratio: | 9.1:1 | |
| Cylinder bore: | 99.3 mm (3.91 in) | |
| Piston stroke: | 84.0 mm (3.31 in) | |
| Number of piston rings (compression / oil): | 2/1 | |
| Number of main bearings: | 4 | |
| Cylinder inner diameter (standard): | 99.314-99.365 mm (3.91-3.912 in) | |
| Piston skirt diameter (standard): | – | |
| Piston pin outer diameter: | 24.996-25.001 mm (0.9841-0.9843 in) | |
| Piston ring side clearance: | Top | 0.038-0.076 mm (0.0015-0.003 in) |
| Second | 0.038-0.076 mm (0.0015-0.003 in) | |
| Oil | 0.060-0.210 mm (0.0024-0.0083 in) | |
| Piston ring end gap: | Top | 0.254-0.508 mm (0.010-0.020 in) |
| Second | 0.254-0.508 mm (0.010-0.020 in) | |
| Oil | 0.254-1.270 mm (0.010-0.050 in) | |
| Connecting rod small end diameter: | 24.940-24.978 mm (0.9819-0.9834 in) | |
| Crankshaft main journal diameter: | 63.487-63.513 mm (2.4995-2.5005 in) | |
| Crankpin diameter: | 53.950-53.975 mm (2.124-2.125 in) | |
Main bearing beam bolts tightening procedure and torque specs:
- 115 Nm; 11.5 kg·m; 85 ft·lb in two-three stages
After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing bolts
- 61 Nm; 6.0 kg·m; 45 ft·lb
Flywheel fixing bolts
- 75 Nm; 7.5 kg·m; 55 ft·lb
Cylinder head
The cylinder heads are made of cast-iron. The engine has a single camshaft over-head valves. The camshaft is driven by a single timing chain. The intake valve diameter is 48.665 mm (1.916 in), the duration is 240° the exhaust valve diameter is 41.250 mm (1.624 in), the duration is 248°. The Chrysler 239 Magnum engine is equipped with hydraulic valve tappets.
| Cylinder head | ||
| Block head alloy | Cast-iron | |
| Valve Arrangement: | OHV, chain drive | |
| Head surface flatness | – | |
| Valves: | 12 (2 valves per cylinder) | |
| Intake valve timing | 240° | |
| Exhaust valve timing: | 248° | |
| Valve head diameter: | INTAKE | 48.665 mm (1.9159 in) |
| EXHAUST | 41.250 mm (1.624 in) | |
| Valve length: | INTAKE | 124.280-125.92 mm (4.8929-4.9575 in) |
| EXHAUST | 124.64-125.27 mm (4.9071-4.9319 in) | |
| Valve stem diameter: | INTAKE | 7.899-7.925 mm (0.311-0.312 in) |
| EXHAUST | 7.899-7.925 mm (0.311-0.312 in) | |
| Valve spring free length: | 49.962 mm (1.967 in) | |
Head tightening procedure and torque specs:
- Step 1: 68 Nm; 6.8 kg·m; 50 ft·lb
- Step 2: 143 Nm; 14.0 kg·m; 105 ft·lb
Cylinder head cover bolts
- 11 Nm; 1.1 kg·m; 8.1 ft·lb
Maintenance data
| Compression pressure | |
| Standard | 689 kPa (100 psi) |
| Oil system | |
| Recommended engine oil | SAE: 10W-30 |
| Oil type API | API: SH or SH/CD |
| Engine oil capacity (Refill capacity) | With filter change 3.8 L (4.0 US. qt, 3.35 Imp. qt.) Without filter change 3.3 L (3.5 US. qt, 2.9 Imp. qt.) |
| Oil pressure | Idle speed: 41.4 kPA, (6 psi) 3,000 rpm 207-551 kPA, (30-80 psi) |
| Ignition system | |
| Spark plug | Champion RC12YC |
| Spark plug gap | 0.9 mm (0.0354 in) |
| Spark plug tightening torque | 41.0 N·m (4.2 kg·m, 30.2 ft·lb) |
Vehicle applications
| Model | Years Produced |
| Dodge Dakota | 1992–2003 |
| Dodge Ram Van | 1992–2003 |
| Dodge Ram Wagon | 1992–2003 |
| Dodge Ram | 1992–2001 |
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