Isuzu 4BD1T Introduction.
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Thread: Isuzu 4BD1T Introduction.

  1. #1
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    Default 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.
    Isuzu 4BD1T Junkie.

  2. The Following 2 Users Say Thank You to Dougal For This Useful Post:

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  4. #2
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    Smile

    Can we get those #'s in English,Pleeease?:

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    Default

    No use picking a fight, these were built metric and our friends in the Southern world are conversant in that language.Do a Google search on metric conversions and you'll get some idea..

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    Default

    I went ahead and converted it for those that find it easier.


    Cylinders: 4
    Injection: direct
    Injection pump: Bosch/Zexel type A inline pump on RHS (drivers perspective)
    Bore: 4.0157in
    Stroke 4.6457in
    Valves: 8
    Inlet manifold seperate casting RHS (drivers perspective).
    Exhaust LHS (drivers perspective).
    Weight: Approx 770lbs turbo. 744lbs NA (source Isuzu spec sheet from 1988)
    Dimensions NA: 31.3in long x 27.8in wide x 29.7in 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 104.6hp @ 3200rpm.
    Torque output NA: Varies but up to 194ftlbs @ 1900rpm.

    Power output Turbo: varies but up to 140.8hp @ approx 3000rpm.
    Torque output Turbo: Varies but up to 243.4ftlbs @ approx 1800rpm.

    Boost: Approx 13psi stock.

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    Default Cool

    Thanks for translating!

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    Do you know the name of or where to get a repair manuel for this engine that is in english? Thank you! ~Taryn

  11. #7
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    Check the other stickies in this section of the forums.

    ________________________________________
    1998 Silverado ECSB • Dana 44 + 14 Bolt • Isuzu 4BD1-T Engine • 4L80E Transmission

  12. #8
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    Sorry to ask a stupid question but how do I find these stickies?

  13. #9
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    Default

    The stickies are usually the first listed in each forum or main thread. Note for instance the first four or five threads in the Isuzu group. The stickies are permanently there to give you background info on a topic. There is indeed a wealth of information found there.

    Good luck!

  14. #10
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    This thread we're posting in right now is a sticky. :P

    Here is the thread I was referring to.

    https://www.4btswaps.com/forum/showth...BD2T-Reference

    ________________________________________
    1998 Silverado ECSB • Dana 44 + 14 Bolt • Isuzu 4BD1-T Engine • 4L80E Transmission

  15. #11
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    Cool Exus Isuzu Parts

    Hi,

    My name is Leo and i represent Exus Isuzu. I am glad to see this much enthusiasm around the 4BD1-TC series, they are very, very good engines. I know several people that rolled over the odometer on their NPR's.

    I wonder what was Isuzu thinking when they switched to indirect ingection on the 4bd2 .... so many cracked heads....

    Long Story Short: I have the manuals for 4bd1,4bd2, 4he1, 6bd1, 6bg1 and 6he1 and I'm willing to share.

    PM me or email at info[at]exusparts[dotcom] We also have a complete line of aftermarket parts for these engines and we export all around the glove (new and used parts)

    Pricing examples: 4bd1 & 4bd2 complete overhaul kit $990

    feel free to email or call (305) 634 9424
    Attached Images Attached Images

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    Thank you very much for this. I need to know if i can fit one into my 1993 Montero. This is a good start!!

  18. #13
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    Default

    The 4BD1 and 4BD2TC are about the size of a chevy big block. Here they are common in NPR trucks and swapped into Land Cruisers that were V8.

  19. #14
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    Default

    Hi there,
    I'm new here and never swapped a diesel engine before so I'm looking forward to find some interesting stuff here.I was looking for a 4bt but I just found a 4bd1 non-turbo that's hooked up on a 24 volt generator and I was wondering if it would be a big deal make it turboed. I also read online that they fit on 700r4 so they fit any gm rwd transmission I presume?
    Thanks!

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