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Isuzu 4BD1T Introduction.
This thread is an introduction to this engine for those newcomers wanting to know more.
The Isuzu 4BD1 is a 3.9 litre four cylinder diesel engine. It was manufactured by Isuzu in Japan from the early 1980's 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.
Timeline:
Approx 1980 this engine became available as an industrial and marine engine, it also used in Isuzu light trucks known as the K series.
The Australian military fitted this engine in non-turbo form to their Stage 1 landrovers (heavy duty series 3) and in turbo form to their 6x6 landrovers (Perentie).
It was an option in civilian landrovers for a number of years in New Zealand and Australia.
In 1985 Isuzu redesigned their light trucks and released the NPR range. The NPR59 model (4 ton load capacity) was powered by a factory turbocharged 4BD1T.
In some markets the Isuzu 4BD1T in the NPR's was superceeded by the indirect injection 4BD2T. In other markets the direct injection 4BD1T remained until displaced by the larger 4H series engines.
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.
Basic specifications:
Cylinders: 4
Injection: direct
Injection pump: Bosch/Zexel type A inline pump on RHS (drivers perspective)
Bore: 102mm
Stroke 118mm
Valves: 8
Inlet manifold seperate casting RHS (drivers perspective).
Exhaust LHS (drivers perspective).
Weight: Approx 350kg turbo. 338kg NA (source Isuzu spec sheet from 1988)
Dimensions NA: 795mm long x 706mm wide x 754mm tall.
Bellhousings: SAE #3 automotive (rare), SAE #3 industrial (rare), Landrover LT85/95 (rare), Isuzu truck pattern (most common).
Starting aids: Glowplugs and excess fuel.
Electrical: 12v in US market, 24v in rest of the world.
Turbochargers: IHI RHB6 (early), Garrett T25 wastegated (early), Garrett T25 freefloat with T3 flange or Garrett T25 wastegated with T3 flange.
Alternator: 12v or 24v depending on market, vacuum pump on rear. Located high on LHS (drivers perspective).
AC Compressor: if fitted below alternator on LHS (drivers perspective).
Power output NA: Varies but up to 78kw @ 3200rpm.
Torque output NA: Varies but up to 263Nm @ 1900rpm.
Power output Turbo: varies but up to 105kw @ approx 3000rpm.
Torque output Turbo: Varies but up to 330Nm @ approx 1800rpm.
Boost: Approx 13psi stock.
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