Place of Origin:
China
Brand Name:
John
Model Number:
6081
The 6081 is the 8.1 litre inline six of the PowerTech family, built on a 116 mm bore and 129 mm stroke (494 cu in). Its real identity sits in the configuration code that follows the number — from the turbocharged T build through the aftercooled A and the 224 kW H version to the 250 hp AF industrial rating — and compression ratio moves with the build between 16.5 and 15.7 to 1. This page lists the configuration codes, the part numbers that belong to each, and the neighbouring models that are often confused with it.
| Product Name | Complete Engine Assembly |
|---|---|
| Engine Model | 6081, PowerTech series |
| Configuration Codes | 6081T, 6081A, 6081AF, 6081H, 6081HF |
| Displacement | 8.1 L / 494 cu in |
| Bore and Stroke | 116 mm by 129 mm |
| Aspiration | Turbocharged on T, aftercooled on A and AF |
| Compression Ratio | 16.5 to 1 on T, 15.7 to 1 on H and HF |
| Output Examples | 224 kW / 300 hp on H, 250 hp on AF001, up to 375 hp marine |
| Envelope | 1210 mm long by 597 mm wide |
| Overhaul Numbers | RE64509, RE70688, R116236 |
| Injector Set | RE524364, six per engine |
| Turbocharger | RE501669 and RE527123 on the H build |
| Condition | New, rebuilt and used all offered in this family |
| Letters Carry The Build | T marks turbocharged, A adds aftercooling, H is the high output version, and AF and HF are the industrial and heavy duty variants of those two |
|---|---|
| Family Neighbours | 6068 is 6.8 litres and 6090 is 9.0 litres; both are frequently listed in the same heading as this engine and neither swaps in |
| Ordering Path | A complete engine is ordered by the configuration code plus the serial, as in 6081AF001, and not by the bare number 6081 |
| Piston And Liner Set | Overhaul kits for this family travel on RE64509, RE70688 and R116236, and piston codes 4802 and 4806 appear in the same listings |
Neighbouring head numbers: RE521639 is a 6068 head and RE520563 belongs to 6135, yet both appear in feeds that also carry this engine, so a head bought on the family name will not fit.
Turbo is build specific: RE501669 and RE527123 are quoted for the H build, and fitting them to a lower rated unit changes boost against a fuel setting that was never calibrated for it.
One heading, nine models: Headings listing 4024 through 6135 in a single line are selling a catalogue rather than a stock item, and the price quoted applies to none of them specifically.
Prices below parts value: Figures of five or seven thousand yuan for a complete eight litre engine are deposits or packing charges, since the overhaul kit alone trades in the thousands.
Emission generation: The A and H builds served Tier 2 and Tier 3 markets, so a project demanding a later stage needs a different family rather than a different sticker.
Cylinder head, gasket set, piston and liner kit, bearings, injector, injection pump, turbocharger, oil pump, water pump, fuel lift pump.
Q1: Why does 6081 alone not identify an engine?
Because the number only records displacement. What the engine actually is sits in the letters and digits that follow, and those decide aspiration, cooling, governor setting and the fuel curve. Two units carrying the same six thousand and eighty one can differ by well over a hundred horsepower and by a full point of compression, which is enough to make one a poor substitute for the other.
Q2: How do the T, A and H versions differ in practice?
T is turbocharged, A adds an aftercooler to bring charge temperature down and allow more fuel, and H is the highest rated industrial build at 224 kW. Compression falls from 16.5 to 15.7 to one as boost rises, because the cylinder is being filled more densely and does not need the same geometric ratio to ignite. That is why a head gasket and a piston set are not shared across the three.
Q3: What should a buyer send before an engine is quoted?
The plate photograph showing the configuration code and serial, plus the machine model and the year. The plate ends the guessing in one step, because it records exactly which build left the factory rather than which family the seller thinks it belongs to. Without it, every quotation in this range is an estimate dressed as a price.
Q4: Which injector set fits?
RE524364, supplied as a set of six.
Q5: How much does the H build produce?
224 kW, which is 300 hp.
Q6: Which displacement sits either side?
6068 at 6.8 litres below and 6090 at 9.0 litres above.
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