This is an Isuzu 6HK1 engine for sale in fairly used condition: a complete 7.8 litre inline six turbo diesel, inspected, tested and ready to ship worldwide. It powers Isuzu Forward F series trucks, the GM Duramax 7800 medium trucks, and Hitachi, Case and Sumitomo 30 to 35 tonne excavators.
We match the engine to your engine number and application, and we send photos of the actual unit before you pay.
What Comes With This Isuzu 6HK1 Engine for Sale
- Block with crankshaft, pistons and connecting rods
- Cylinder head with overhead camshaft and 24 valve train
- Fuel system to suit the version: inline pump or Denso common rail with supply pump and injectors
- Turbocharger and manifolds
- Oil cooler, water pump, front cover, sump and flywheel housing
- Photos, test notes and a pallet or crate for shipping
The ECU and harness are included only when agreed in writing. Truck and excavator engines are dressed differently, so tell us which you need. Long blocks are available on request.
Isuzu 6HK1 Specifications
| Engine | Isuzu 6HK1 |
| Layout | Inline six, four stroke, turbocharged |
| Displacement | 7.79 litres (7,790 cc) |
| Bore x stroke | 115 x 125 mm |
| Valve train | Overhead camshaft, 4 valves per cylinder |
| Fuel system | Inline pump on early engines, Denso common rail on most later engines |
| Truck power | Roughly 200 to 300 hp depending on rating |
| Truck torque | Up to about 860 lb-ft at the top ratings |
| Excavator power (ZX330-3 class) | About 184 kW (247 hp) at 2,000 rpm |
| Electrical | 24 V on most applications, 12 V on some North American trucks |
| Common versions | 6HK1-TC, 6HK1X, XQ series, Duramax 7800 |
Trucks and Machines This Engine Fits
Each Isuzu 6HK1 engine for sale in our stock is matched to one of these applications:
- Isuzu Forward FRR, FSR, FTR, FVR, FVZ and FVM
- Isuzu FTR, FVR and FXR in North America
- Chevrolet Kodiak and GMC TopKick C6500, C7500 and C8500 with the Duramax 7800
- Hitachi ZX330 and ZX350 excavators
- Case CX330 and CX350, Sumitomo SH330 and SH350, JCB JS330
- Generator sets, pumps and compressors
Not on the list? Send your engine number and we will check.
Which 6HK1 Version Do You Need?
6HK1-TC
The common truck engine, turbocharged with an intercooler, used across the Forward range and North American F series trucks.
Duramax 7800
The GM name for the 6HK1 in Kodiak and TopKick C series trucks from about 2003 to 2009. GM specific wiring and electronics, usually paired with an Allison automatic.
6HK1X and XQ series
Industrial and excavator engines with common rail, found in Hitachi, Case, Sumitomo and JCB machines and in generator sets.
Euro 4 and Euro 5 truck engines
Later truck engines with EGR and DPD (Isuzu’s particulate filter) and newer electronics.
Send a photo of the engine number on the block and we will match the right Isuzu 6HK1 engine for sale for your truck or machine.
Truck Engine or Excavator Engine?
The core is closely related, but they are not plug and play swaps:
- Sump. Different shapes to clear a truck axle or a machine frame.
- Flywheel housing. Gearbox bell housing in a truck, hydraulic pump coupling in a digger.
- Fuel system and ECU. Calibrated differently for road and machine use.
- Fan drive and pulleys. Different layouts for different cooling packs.
Getting the right version first time saves days of work. That is why we always ask where your Isuzu 6HK1 engine for sale is going.
Condition and Testing
Every Isuzu 6HK1 engine for sale goes through the same checks before we quote it:
- Engine number and version recorded
- Compression test or running test where possible
- Oil and coolant checked for contamination
- Turbo checked for shaft play and oil leaks
- Injectors and fuel system inspected
- Block and head inspected for cracks and old repairs
- Photos taken from every side and sent to you
If an engine is sold as a core or needs work, the quote says so plainly.
What Our Condition Notes Mean
- Tested runner. Run or compression tested and performed well. Ready to fit.
- Good used. Sound engine with normal wear. Small items such as seals may be worth replacing during fitting.
- Core. Sold for rebuilding and priced that way.
Why 6HK1 Engines Fail, and How to Stop It Happening Again
Dirty or wet fuel
Common rail injectors and the supply pump wear quickly with water and dirt in the diesel. Excavators that refuel from site tanks suffer most. Good filters and a daily drained water separator save a lot of money.
Overheating
Blocked radiators on dusty sites and slipping fan belts on old trucks push the engine too hot. The head gasket goes, and the head can crack. Keep the cooling pack clean.
Oil cooler leaks
On high hour engines the oil cooler can leak internally and mix oil and coolant. Check it before blaming the head gasket.
EGR and DPD clogging
Later trucks used for short runs block the EGR valve, EGR cooler and DPD. Regular highway runs and the right low ash oil help.
Dust and skipped services
A torn air filter or old oil wears rings, bearings and the turbo. Follow the service schedule, and shorten it in tough conditions.
Fix the root cause first so your Isuzu 6HK1 engine for sale does not meet the same fate.
Signs You Need a Replacement Engine
- Knocking from the crankshaft area
- Heavy blow by and oil use
- Coolant in the oil that returns after a head gasket job
- Low compression on several cylinders
- Damage after a dropped valve or turbo failure
Send us your symptoms and test results and we will tell you honestly whether a repair or an Isuzu 6HK1 engine for sale makes more sense.
Long Block or Complete Engine?
A long block is the block, crank, pistons, rods, head and valve train. It suits you if your fuel system, turbo and bolt on parts are in good shape.
A complete engine adds the turbo, manifolds, fuel system, water pump and usually the starter and alternator. The price on this page is for a complete Isuzu 6HK1 engine for sale. Ask us for a long block price if you prefer.
Notes for Duramax 7800 Owners
Kodiak and TopKick trucks use GM specific wiring and engine controllers, and some run 12 V systems. The flexplate must match the Allison transmission. If your gearbox also needs work, see our Allison 1000 transmission guide. Send the VIN and engine number and we will match an Isuzu 6HK1 engine for sale to your truck.
Notes for Excavator Owners
On 30 to 35 tonne machines the 6HK1 runs at high load for hours with the hydraulic pump bolted to the flywheel housing.
When you fit the replacement, check the pump coupling, the engine mounts and the hydraulic oil cooler. Send the machine serial number with your request and we will match the machine version.
Before You Fit Your Isuzu 6HK1 Engine for Sale
- Find and fix whatever killed the old engine.
- Clean the radiator and intercooler. Flush the intercooler if the old turbo failed.
- Fit new fuel filters and drain the water separator.
- Prime the fuel system before cranking.
- Register injector codes with a scan tool where needed.
- Use the oil grade Isuzu lists for your emissions level.
- Check hoses and clamps. Old rubber often fails on a fresh engine.
Simple Care for a Long Engine Life
- Change oil and filters on schedule.
- Keep fuel clean and drain water often.
- Clean the cooling pack regularly.
- Avoid long idling.
- Let the DPD complete its regeneration on later trucks.
- Replace air filters on time.
Inline Pump or Common Rail: Which Engine Is Right?
Older 6HK1 engines use an inline injection pump. Most engines built from the early 2000s use Denso common rail. They are not interchangeable without changing the fuel system, the wiring and the engine controller.
The inline pump engine is simple and forgiving of poor fuel, which is why some buyers in remote areas prefer it. The common rail engine is quieter, smoother and more economical, but it needs clean fuel and the right electronics.
The rule is simple: buy the type your truck or machine was built with. Tell us which fuel system your old engine had and we will offer the matching Isuzu 6HK1 engine for sale.
6HK1 Compared With the 4HK1
The 4HK1 is the 5.2 litre four cylinder member of the same family. It shares design ideas and some parts, but it fits lighter N series trucks and smaller excavators. The two engines are not swaps for each other. If your truck has the four cylinder, see our Isuzu 4HK1 engine guide.
Generator and Industrial Users
Many generator sets, water pumps and compressors run on industrial 6HK1 engines. These are set up for steady speed running and often have their own sumps, radiators and governor settings.
Send the generator or pump model with the engine number, and we will find an Isuzu 6HK1 engine for sale built for that duty rather than a truck engine that needs converting.
Parts Supply for the 6HK1
So many of these engines were built that parts are easy to find in most countries. Overhaul kits, gaskets, injectors, supply pumps, turbos, water pumps and oil coolers are all widely available, both genuine and aftermarket. Local diesel shops know the engine well.
That makes an Isuzu 6HK1 engine for sale a safe long term buy. If you need parts along with your engine, ask when you request your quote.
Buying an Engine From Abroad Safely
Buying an engine you cannot touch can feel like a risk. These habits make it safe:
- Ask for photos of the actual engine, including the stamped engine number.
- Ask for test results or a running video.
- Get the included parts list and warranty in writing.
- Read the seller’s policies and check their contact details before paying.
We do all of this as standard for every Isuzu 6HK1 engine for sale. Our article on replacement engine cost also explains what goes into the final price.
Fleet Orders
Fleet owners often need more than one engine, either to fix several trucks at once or to keep a spare on the shelf. We can quote several engines together and ship them in one container to cut the freight cost per engine.
Tell us how many trucks or machines you run, which versions they use and where they work. We will plan a supply of Isuzu 6HK1 engine for sale units that fits your budget and timeline.
Talk to Someone Who Knows Engines
When you contact us, you speak to people who handle engines every day. Tell us what happened to the old engine, what the vehicle does for a living and where it works.
We use that to recommend the right Isuzu 6HK1 engine for sale, the parts worth replacing while the engine is out and the most sensible shipping option. If a repair makes more sense than a replacement, we will say so.
Why Choose a Fairly Used Engine
A clean used engine is the quickest and cheapest way back to work. It costs far less than new, and often less than rebuilding a badly damaged engine once machining and parts are added up. The 6HK1 is a proven design that lasts a long time with clean oil, clean fuel and a healthy cooling system.
The simplest repair is almost always the same engine your truck or machine was built with, and that is exactly what an Isuzu 6HK1 engine for sale from our stock gives you.
Price, Payment and Warranty
The price shown is for a fairly used Isuzu 6HK1 engine for sale in good running condition. The final figure can change with the version, the parts included and the shipping destination, so we always send a written quote first.
Payment is by bank transfer only. See our billing terms. Each engine comes with a written warranty, explained in our used engine warranty guide. Our refund and returns policy is open to read before you order.
Worldwide Shipping
We ship every Isuzu 6HK1 engine for sale by sea or air freight to Africa, the Middle East, Asia, Australia and the Pacific, Europe, the Caribbean and the Americas.
The engine is drained of oil and coolant, every opening is capped, and it is strapped to a pallet or packed in a crate. You receive tracking, the commercial invoice and the packing list. Tell us before shipping if your customs need extra documents. See our shipping policy for details.
Packing Details
Before the engine leaves, we drain the oil and coolant and cap every opening: intake, exhaust, turbo ports, fuel lines and oil lines. Loose parts are bagged and tied to the engine so nothing goes missing in transit.
For sea freight the engine is bolted to a strong pallet or packed in a wooden crate that can handle being moved by forklift many times. For air freight we keep the packing lighter but just as secure. Each Isuzu 6HK1 engine for sale is photographed again once packed, so you can see exactly how it was sent.
When Your Engine Arrives
- Photograph the pallet or crate before opening it.
- Check the engine number against your quote.
- Make sure every listed part is there.
- Turn the crank by hand to confirm it moves freely.
- Contact us within the time on your quote if anything does not match.
How to Order
- Send your engine number, truck or machine model and country through our contact page, or call +1 (209) 733-0882.
- Get photos and a written quote with shipping.
- Pay by bank transfer.
- We pack and ship with tracking.
For the full background on this engine, read our Isuzu 6HK1 engine for sale guide. New to buying from abroad? Our guide on how to buy a used engine online will help.
Who Buys This Engine From Us
Fleets running Isuzu Forward trucks for haulage, tipping and delivery. Plant hire firms with Hitachi and Case excavators. Workshops repairing trucks and machines. Engine importers who resell in their home market. Whether you need one Isuzu 6HK1 engine for sale or a container load, each engine is quoted with photos and honest notes.
Related Engines
We also sell the Isuzu 4JJ1, the Hino J05E, the Caterpillar C7 and the Cummins ISL. Browse all Isuzu engines or our full shop.
Frequently Asked Questions
Is this a complete engine?
Yes. This Isuzu 6HK1 engine for sale is a complete engine. Long blocks are available on request.
Is the Duramax 7800 the same engine?
Yes, it is the 6HK1 sold under the GM name.
Is it common rail?
Most later engines are. Early engines use an inline injection pump.
Will a truck engine fit my excavator?
Not directly. Send your engine number and we will supply the right version.
Is the ECU included?
Only if agreed in writing on your quote.
How do I pay?
Bank transfer only.
Can I see the engine first?
Yes. We send photos of the actual Isuzu 6HK1 engine for sale and test notes before you pay.
Ready to get your Isuzu working again? Contact us today for photos and a price on this Isuzu 6HK1 engine for sale.
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