3.9L Isuzu 4BD1T Engine Specs

Isuzu 4BD1T Diesel Specs (1986 - 1991)

The Isuzu 4BD1T is a direct injection, turbocharged diesel engine with a 3.9L displacement. It is found in 1986 to 1991 model year Isuzu NPR and Chevrolet W4500 commercial vehicles in addition to global on-highway, marine, and industrial applications. It is a turbocharged version of the naturally aspirated 4BD1, offering significant more power and less power loss at higher altitudes. Possibly the most common power rating was a 135 horsepower variant rated at a peak 243 lb-ft, although the engine series was produced many varieties depending on application and model year.

3.9L Isuzu 4BD1T Specs

Engine:	Isuzu 3.9L 4BD1-T (AKA QD100T)
Manufacturer:	Isuzu Motors Ltd
Applications:	1986 - 1991 Isuzu NPR/Chevrolet W4500
Type:	4 stroke direct injection diesel
Configuration:	Inline 4 cylinder (I-4/L-4)
Displacement:	3.856 liters, 236.08 CID
Firing Order:	1 - 3 - 4 - 2
Engine Block:	Cast iron, dry type cylinder liner
Cylinder Head:	Cast iron
Compression Ratio:	17.5 : 1
Cylinder Bore:	4.02 in (102 mm)
Cylinder Stroke:	4.65 in (118 mm)
Valvetrain:	OHV, solid lifter camshaft
Injection:	Mechanical inline injection pump, direct injection
Aspiration:	Turbocharged, IHI 6HB6 or Garrett T25 models
Engine Dimensions (approx.):	Length:	31.3 in
	Width:	27.8 in
	Height:	29.7 in
Engine Weight (approx):	~770 lbs
Peak Horsepower:	up to 135 hp @ 3,000 RPM (varies by application, 135 hp rating common for Isuzu NPR/Chevrolet W4 applications)
Peak Torque:	up to 243 lb-ft @ 1,800 RPM (varies by application)
Idle Speed:	~ 650 RPM
Max Engine Speed:	~ 3,500 RPM