1989-1993 5.9L Cummins
The original 6BT—the engine that revolutionized the diesel pickup segment.
Engine Name: 6BT Cummins
Production Plant: Rocky Mount, North Carolina (1988-1992) and Walesboro, Indiana (Cummins Midrange Engine Plant, CMEP) (1992-1993)
Configuration: Inline-six (I-6)
Bore: 4.02-inch
Stroke: 4.72-inch
Displacement: 359 ci (5.9L)
Compression Ratio: 17.0:1
Firing Order: 1-5-3-6-2-4
Block: Cast-iron, deep-skirt, parent bore
Head: Cast-iron, 12-valve, crossflow style with six head bolts per cylinder and induction-hardened valve seats
Crankshaft: Forged-steel with induction-hardened fillets and journals
Connecting Rods: Forged-steel, I-beam with 7/16-inch rod bolts
Pistons: Cast-aluminum with 1.57-inch diameter floating wrist pin, bowl redesigned in ’91.5 (with release of intercooled engine)
Valvetrain: Overhead valve (OHV), 2 valves per cylinder, single cam-in-block design with solid lifters, ductile-iron intake and exhaust rockers
Injection System: Mechanical, direct injection
Injection Pump: Bosch VE, rotary/distributor style, single plunger, 17,400 psi peak pressure
Injectors: Bosch pop-off pressure, 245 bar mechanical
Lift Pump: Mechanical, cam-driven
Aspiration: Turbocharged (all years) and intercooled (’91.5-‘93)
Intake: Cast-aluminum manifold
Turbo: Holset H1C, fixed geometry, 18 cm2 turbine housing (’89-’91, ’92.5-‘93), 21 cm2 turbine housing (’91.5-‘92)
Peak Boost: 18 psi
Intercooler: Air to air
Horsepower: 160 hp at 2,500 rpm
Torque: 400 lb-ft at 1,700 rpm
Governed Speed: 2,700 rpm
Available Transmissions: TorqueFlite A727 three-speed automatic, A518 four-speed automatic, Getrag G360 five-speed manual
