The Cummins 6BT is a 5.9 L (5,883 cc, 359 cu·in) six-cylinder four-stroke water-cooled turbocharged internal combustion diesel engine, manufactured by Cummins from 1984 to 1998.
A 102.0 mm (4.02 in) cylinder bore and 120.0 mm (4.72 in) piston stroke give the 6BT engine a total of 5,883 cc of displacement. The compression ratio rating is 17.5:1.
The 6BT engine produced from 163 PS (120 kW; 160 HP) at 2,500 rpm to 218 PS (160 kW; 215 HP) at 2,600 rpm of maximum horsepower and from 542 N·m (55.3 kg·m, 399.5 ft·lb) at 1,600 rpm to 569 N·m (58 kg·m, 419.4 ft·lb) at 1,600 rpm of maximum torque.
The Cummins 6BT 5.9 L 12v features:
- OHV design with two valves per cylinder
- Turbocharger
- Direct Injection (DI), mechanical injection pump, mechanical fuel injectors
- Cast-iron cylinder block with induction hardened forged steel crankshaft
- Cast aluminum pistons and forged steel connecting Rods
- Cast-iron cylinder head with high swirl bowl combustion chambers
- Chilled ductile iron camshaft
General information
| Engine Specifications | |
| Engine model | 6BT |
| Engine type | 4-stroke, OHV, Straight-6 |
| Displacement | 5.9 L, 5,883 cm3, (359.0 cu·in) |
| Max. horsepower | From 163 PS (120 kW; 160 HP) at 2,500 rpm to 218 PS (160 kW; 215 HP) at 2,600 rpm |
| Max. torque | From 542 N·m (55.3 kg·m, 399.5 ft·lb) at 1,600 rpm to 569 N·m (58 kg·m, 419.4 ft·lb) at 1,600 rpm |
| Lubricating system | Pressurized lubrication |
| Fuel system | Direct Injection (DI), mechanical injection pump, mechanical fuel injectors 1989 – 1993: Bosch VE44 rotary injection pump 1994 – 1998: Bosch P7100 injection pump |
| Turbocharger | 1989-1993: Holset H1C 1994: Holset WH1C 1994-1998: Holset HX35 |
| Firing order: | 1 -5-3-6-2-4 |
| Dimensions (L x W X H) | 1,020 x 633 x 960 mm (40.2 x 24.9 x 37.8 in) |
| Weight | 500 kg (1,100 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Cylinder block alloy: | Cast-iron |
| Compression ratio: | 17.5:1 |
| Cylinder bore: | 102.0 mm (4.02 in) |
| Piston stroke: | 120.0 mm (4.72 in) |
| Cylinder internal diameter (standard): | 102.116 mm (4.0203 in) |
| Piston skirt outer diameter (standard): | 101.880-101.823 mm (4.011-4.0088 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 40.042 mm (1.5765 in) |
| Piston pin diameter: | 39.990 mm (1.5744 in) |
| Ring end gap (Top): | 0.400-0.700 mm (0.0157-0.0276 in) |
| Ring end gap (Second): | 0.250-0.550 mm (0.0098-0.0217 in) |
| Ring end gap (Oil): | 0.250-0.550 mm (0.0098-0.0217 in) |
| Number of main bearings: | 7 |
| Crankshaft main journal diameter: | 82.962 mm (3.2662 in) |
| Crankpin journal diameter: | 68.962 mm (2.715 in) |
| Crankshaft center distance: | 60 mm (2.36 in) |
| Cylinder head | |
| Cylinder head alloy: | Cast-iron |
| Valve arrangement: | OHV, Gear driven |
| Valves: | 2 (12 valves in total) |
| Valve steam diameter (INTAKE): | 7.935-7.960 mm (0.3124-0.3134 in) |
| Valve steam diameter (EXHAUST): | 7.935-7.960 mm (0.3124-0.3134 in) |
| Valve spring free length (INTAKE): | 60.0 mm (2.3622 in) |
| Valve spring free length (EXHAUST): | 60.0 mm (2.3622 in) |
| Camshaft lobe height (INTAKE): | 47.040 mm (1.852 in) |
| Camshaft lobe height (EXHAUST): | 46.770 mm (1.8413 in) |
| Camshaft journal diameter : | 53.962 mm (2.1245 in) |
Tightening procedure and torque specs
| Valve clearance | |
| Main bearing cap | Step 1: 60 Nm; 6.0 kg·m; 45 ft·lb Step 2: 119 Nm; 12.0 kg·m; 88 ft·lb Step 3: 176 Nm; 18.0 kg·m; 129 ft·lb |
| Connecting rod bearing bolts | Step 1: 35 Nm; 3.5 kg·m; 26 ft·lb Step 2: 70 Nm; 7.0 kg·m; 51 ft·lb Step 3: 100 Nm; 10.0 kg·m; 73 ft·lb |
| Flywheel fixing bolts | 137 Nm; 14.0 kg·m; 101 ft·lb |
| Head tightening procedure and torque specs | Step 1: 90 Nm; 9.0 kg·m; 66 ft·lb Step 2: 120 Nm; 12.0 kg·m; 89 ft·lb Step 3: Turn all bolts 90° |
Service Data
| Valve clearance | |
| Intake valve clearance (COLD): | 0.25 mm (0.0098 in) |
| Exhaust valve clearance (COLD): | 0.51 mm (0.0201 in) |
| Oil system | |
| Lubrication system: | Pressurized lubrication |
| Oil type: | CE or CE/SG |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 9.5 L (10.04 US. qt, 8.36 Imp. qt.) |
| Oil pressure: | 69 kPa (0.7 kg/cm3; 10 psi) at idle rpm 207 kPa (2.1 kg/cm3; 30 psi) at 2,500 rpm |
Applications
| Model | Years Produced |
| Dodge Ram Pickup | 1989–1998 |
| Light duty, medium duty and select heavy duty trucks and buses | – |
Author:
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