Isuzu 4BD1T Series Engine

Isuzu 4BD1T Series Engine

The Isuzu 4BD1 is a 3.9 litre four cylinder diesel engine. It was manufactured by Isuzu in Japan and in some places is still in production. In the USA, early forms of this engine were known as the QD100.

The six cylinder version (6BD1) was also known as the QD150. Approx 1980 this engine became available as an industrial and marine engine, it also used in Isuzu light trucks known as the K series.

As a marine and industrial engine the 4BD1 and 4BD1T continue to be sold in some countries. Isuzu still offer 4BG1 and 4BG1T industrial and marine engines which while larger displacement are the same engine family and offer power outputs of up to 200hp.

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Engine:

Isuzu 3.9L4BD1-T(AKA QD100T)

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 6HB6or Garrett T25 models

Engine Dimensions (approx):

Length: 31.3 in

Width: 27.8 in

Height: 29.7 in

Engine Weight(aporox):

~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 Ib-ft @ 1,800 RPM(varies by application)

Idle Speed:

~650 RPM

Max Engine Speed:

-3,500 RPM

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