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The 4JJ1 is Isuzu’s 3.0-litre four-cylinder common rail diesel, fitted to the D-Max RC and RT, the MU-X, and the Holden Colorado RC and RG.We carry 52 parts for the 4JJ1. The 4JJ1 runs a timing chain, not a belt.
Injectors
Injector sets are what most 4JJ1 owners are here for. Check whether your vehicle is DPF or non-DPF before ordering — the injectors are not interchangeable across the range, and it is the single most common ordering mistake on this engine. If you are unsure, send us your build date and VIN and we will confirm the right set.
4JJ1 rebuild kits
Full kits with pistons, rings, bearings and gaskets, with sizes selectable to suit a machined block.
Other 4JJ1 parts we stock
Head and full gasket sets, common rail fuel pumps, timing components and cooling.
4JJ1 by vehicle
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Select options This product has multiple variants. The options may be chosen on the product page Quick View -
Select options This product has multiple variants. The options may be chosen on the product page Quick View
Which injector fits your engine?
Not sure which injector your 4JJ1 build takes? Work it out at diesel injectors by vehicle.
