Isuzu TCR50, 4JH-DT, 4JJ1-TC, 4JJ1-DTI, 4JJ1-DTH 1997 Parts Catalog

You ever order a fuel injection pump for a 4JJ1-TC and end up with the wrong flange? I have. That’s because aftermarket catalogs treat all these engines like they’re the same. They aren’t. The Isuzu TCR50, 4JH-DT, 4JJ1-TC, 4JJ1-DTI, 4JJ1-DTH 1997 Parts Catalog is the only source that breaks down every fastener, gasket, and pump assembly by engine serial number range. This isn’t a generic parts list – it’s the actual factory document used by Isuzu dealers in 1997. If you’re rebuilding a 4JH-DT or swapping a 4JJ1-DTH into a TCR50 chassis, you need this open on your bench, not a screenshot from a forum.

What You Get in This 80-Page Catalog

Eighty pages of exploded-view diagrams, part numbers, and compatibility notes. Each illustration – like Fig. 29 for the fuel injection pump – shows which hardware applies to which engine variant. That screw M10 x 16? It’s part number 250002-06162, and you need nine of them for a 4JJ1-DTI but only eight for a 4JJ1-TC. The catalog flags these differences with “Applicable” columns so you don’t guess. Page 1 starts with the engine assembly (P-TCR50EDC) and runs through every subsystem. No year overlap – this is the 1997 release, specific to that production year. Trying to use a 1999 catalog on a 1997 TCR50 will land you the wrong boost compensator.

OEM Parts Catalog: Why It Matters

I’ve seen guys bolt on a fuel injection pump from a 4JJ1-TC onto a 4JH-DT because both had the same housing diameter. Then the boost compensator didn’t match the intake manifold. That’s a three-hour redo. This catalog gives you the Isuzu part number for each pump – 759995-51391 for (A) 4JH-DT, (B) 4JJ1-TC, (C) 4JJ1-DTI, (D) 4JJ1-DTH – and includes engine serial number cutoffs so you get the correct revision. The compatibility symbols (N, R, K, etc.) tell you if a new part supersedes the old one and whether it swaps backward. Aftermarket catalogs don’t carry that data. They just say “fits TCR50” and leave you holding the wrong gasket.

Fuel Injection Pump Section – A Closer Look

Look at page 1, Fig. 29. You’ve got the fuel injection pump assembly listed with four different part numbers – one per engine code. The “QTY” column shows how many of each fastener you need: nine screws M10 x 16 for 4JH-DT, eight M10 x 20 for others. The “Remarks” section notes boost compensator type and optional parts up to engine serial number 00155. That level of detail is why I keep a paper copy in the toolbox. Also check the bearing, roller (122710-51050) – it’s shared across all four engines, but the retainer spring (129470-51060) is specific. If you’re ordering this part for a 4JJ1-DTH, confirm the serial range against the table.

3 Engine Variants and Their Part Differences

This catalog covers four engines in one document, but the real differences break into three groups based on the fuel system. The 4JH-DT uses a different injection pump (759995-51391 with boost compensator) than the 4JJ1-TC (same pump but different spring rates). The 4JJ1-DTI and 4JJ1-DTH share more hardware, but the boost compensator on the DTH is optional above engine serial 00156. You’ll also see different screw lengths on the pump mounting – M10 x 20 on the 4JJ1-DTI vs M10 x 16 on the 4JJ1-TC. Miss that spec and you’ll strip the threads in the housing. The catalog’s “Applicable” column makes it clear: if you don’t see your engine code in that row, that part doesn’t fit.

Does This Manual Cover Your Engine?

If you own an Isuzu TCR50 chassis with one of these four engines – 4JH-DT, 4JJ1-TC, 4JJ1-DTI, or 4JJ1-DTH – and the production year is 1997, then yes. The manual is titled specifically for those combinations. It does not cover earlier or later model years, nor does it include the 4JJ1-TC with aftermarket turbos. The part numbers are valid for the 1997 model as shipped from the factory. Aftermarket modifications like an aftercooler or a different injection pump aren’t addressed. For more context on the Isuzu engine family, see the Automotive Industry Overview or check the Automotive Battery section if you’re working on the electrical system.

How to Use Part Numbers and Compatibility Codes

Each line in the catalog has a reference number, a part number, a description, a quantity, and a compatibility symbol. For example, on page 1 under fuel injection pump, you’ll see “N” for new part superseding old, “R” for discontinued. If you see “K,” that part is obsolete – order the replacement listed in the remarks. The Japanese notes explain that some optional parts are only for certain serial ranges (e.g., “A/E/#00155”). Translate those or get a buddy who reads Japanese. I’ve found that printing the fuel injection pump page and taping it to the bench saves me from ordering the wrong retainer. This catalog is 80 pages of that same granular data.

Q: What is the tool list for using this parts catalog?

A computer or printed copy – the catalog is a PDF. You’ll also need a serial number from your engine block to cross-check against the compatibility codes.

Q: Can I use this catalog to rebuild a 4JJ1-TC from a 1998 model?

No. This catalog is for 1997 model year only. Isuzu changed the fuel injection pump mounting bolts and boost compensator in 1998. Using 1997 part numbers on a 1998 engine will give you the wrong gaskets and screws. Order the correct year-specific catalog from the related manuals below.

Related Manuals:

• Isuzu ZX240-3 Series Parts Catalog – 370 Pages OEM
• Isuzu D-MAX 2009 Parts Catalog | OEM Factory Manual 465 Pages
• Isuzu TBR 2007 Parts Catalog – OEM Factory Part Numbers

That screw you’re about to buy – either you get the right length and thread pitch from this catalog, or you make a second trip to the parts counter. Download the Factory Manual now and keep it on your tablet while you work. Your torque wrench doesn’t care about guesswork, and neither does your engine.