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Holden Jackaroo Engine Number
Use this guide to locate the engine number on your Holden Jackaroo and line up the right engine-related parts enquiry.
The Holden Jackaroo (1981-2004) was a rebadged Isuzu Trooper – a body-on-frame four-wheel-drive wagon built on Isuzu's UBS platform and sold in short-wheelbase three-door and long-wheelbase five-door forms. It was offered with Isuzu petrol fours and V6s and with turbo-diesel fours across two generations.
Where to find your Holden engine number
The stamped engine number is on a machined pad on the block. Its location depends on the engine family:
- Inline six-cylinder: on a pad on the right-hand side of the block, above the engine-mount boss.
- V8 (253 / 308, 4.2 / 5.0 litre): on a pad on the left-hand side of the block, above the engine mounting.
- V6 (Buick-derived, Ecotec, Alloytec): on the front left-hand face of the block, below the ignition coil.
- Later V6 and LS V8 models: the build / engine plate sits on the radiator support panel (VT-VZ era) or the passenger-side strut tower (VE / VF era).
You may need to wipe the pad clean to read the stamped number, and on air-conditioned cars the compressor can sit in front of it. Older Holden engines use a capacity-plus-tune prefix (for example 186S or a Q-series V8 code), while modern engines (Ecotec, Alloytec and the LS V8 family) use a GM engine code plus a separate stamped serial.
For the most accurate part match, send us both the engine code or prefix and the full stamped number, along with whether the car is automatic or manual.
On this model
Jackaroo engines are Isuzu units identified by Isuzu engine codes and stamped serial numbers, not by the Holden engine-prefix system, so always quote the code and the stamped number when sourcing parts. Petrol options ran from the 2.6-litre four (Isuzu 4ZE1) up to V6s – the 3.2-litre 6VD1 and later 3.5-litre 6VE1 – while the turbo-diesels were the 2.8-litre 4JB1-T and the later 3.0-litre 4JX1 direct-injection unit. State clearly whether your car is petrol or diesel, as they share very few parts. Read the engine code and serial from the stamping on the block rather than assuming it from the year, since some models were offered with more than one engine. Cross-referencing the same engine code in the Isuzu Trooper range will usually broaden the available parts.
This page also draws on later year-by-year data for Holden Jackaroo to cover modern variants.
Frequently asked questions
Where is the engine number on a Holden Jackaroo?
It is stamped on a machined pad on the engine block. Inline sixes are on the right side above the engine mount, the 253/308 V8s on the left side above the mount, and the V6 engines on the front left face below the ignition coil. You may need to wipe the pad clean to read it.
What is the difference between an engine prefix and an engine code?
Older Holden engines use a capacity-plus-tune prefix stamped on the block, while modern engines (Ecotec, Alloytec and the LS V8 family) use a GM engine code plus a separate stamped serial.
Do you match engine numbers to parts?
Yes. Send us the engine code or prefix and the full stamped number, plus whether the car is automatic or manual, and we will match the right engine-related part.
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